Simple Calculator app keeps crashes

Simple Calculator app keeps crashes - java

I'm a beginner in Android. Just started working on a Calculator app and don't know why the app keeps crashing all the time.
I have Two Activities... MainActivity and CalculatorActivity
MainActivity:
public class MainActivity extends AppCompatActivity
{
Button calcubtn;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
calcubtn = (Button) findViewById(R.id.calculatorbtn);
calcubtn.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View view)
{
Intent calculator = new Intent(MainActivity.this, CalculatorActivity.class);
startActivity(calculator);
}
});
}
}
MainActivity Layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.rfkha.myfirstapp.MainActivity">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="13dp"
android:textSize="27sp"
android:textColor="#android:color/holo_red_light"
android:text="#string/functions_text" />
<Button
android:id="#+id/calculatorbtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="#+id/textView"
android:layout_marginStart="43dp"
android:layout_marginTop="70dp"
android:text="#string/calcu_string"
/>
</RelativeLayout>
CalculatorActivity: (i.e child activity)
Here in the activity class, I've added implements View.OnclickListener . I found it in stackoverflow somewhere. I think the problem is from this thing. Also it required to used the keyword abstractto use it with the activity class, so i used that too.
public abstract class CalculatorActivity extends AppCompatActivity implements View.OnClickListener {
Button btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, zerobtn, dotbtn, equalbtn, minusbtn, sumbtn, divbtn, mulbtn;
double num1, num2;
boolean sum, minus, div, mul;
EditText textarea= (EditText) findViewById(R.id.textarea);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator);
btn1 = (Button) findViewById(R.id.btn1);
btn1.setOnClickListener(this);
(((Same Code for buttons upto 9 and SUM, MINUS, DIVISION and MULtiplication Buttons)))
}
#Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.btn1: {
textarea.setText(textarea.getText()+"1");
break;
}
case R.id.btn2: {
textarea.setText(textarea.getText()+"2");
break;
}
case R.id.btn3:
((((( And So on... Upto Button 9 ))))))
case R.id.zerobtn: {
textarea.setText(textarea.getText()+"0");
break;
}
case R.id.dotbtn: {
textarea.setText(textarea.getText()+".");
break;
}
case R.id.sumbtn: {
num1=Double.parseDouble(textarea.getText().toString());
sum=true;
textarea.setText(null);
break;
}
(((((Likewise for Minus, Division and Multiplication buttons))))))))))
case R.id.equalbtn:
{
if (num1!=0)
{
num2=Double.parseDouble(textarea.getText().toString());
if (sum) {
textarea.setText(num1+num2+"");
sum=false;
}
else if(mul) {
textarea.setText(num1*num2+"");
mul=false;
}
else if(div) {
textarea.setText(num1/num2+"");
div=false;
}
else if(minus) {
textarea.setText(num1-num2+"");
minus=false;
}
}
else{
Toast.makeText(getApplicationContext(), "First select a number!!", Toast.LENGTH_SHORT);
}
break;
}
}
}
}
Calculator Activity Layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="1"
tools:context="com.example.rfkha.myfirstapp.CalculatorActivity">
<TextView
android:id="#+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="13dp"
android:layout_marginTop="8dp"
android:gravity="center_horizontal"
android:text="#string/calculatortxt"
android:textSize="25sp" />
<EditText
android:id="#+id/textarea"
android:layout_width="351dp"
android:layout_height="154dp"
android:layout_marginStart="16dp"
android:ems="10"
android:hint="#string/resultsString"
android:textSize="33sp"
android:textAlignment="textEnd"
android:padding="11dp"
android:inputType="textPersonName" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center_horizontal"
android:orientation="horizontal"
android:weightSum="1">
<Button
android:id="#+id/clearbt"
android:layout_width="293dp"
android:layout_height="51dp"
android:text="#string/cetxt"
android:textSize="24sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center_horizontal"
android:orientation="horizontal">
<Button
android:id="#+id/btn7"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="7"
android:textSize="24sp" />
<Button
android:id="#+id/btn8"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="8"
android:textSize="24sp" />
<Button
android:id="#+id/btn9"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="9"
android:textSize="24sp" />
<Button
android:id="#+id/mulbtn"
android:layout_width="68dp"
android:layout_height="51dp"
android:layout_marginStart="27dp"
android:text="x"
android:textSize="18sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center_horizontal"
android:orientation="horizontal">
<Button
android:id="#+id/btn4"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="4"
android:textSize="24sp" />
<Button
android:id="#+id/btn5"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="5"
android:textSize="24sp" />
<Button
android:id="#+id/btn6"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="6"
android:textSize="24sp" />
<Button
android:id="#+id/minusbtn"
android:layout_width="68dp"
android:layout_height="51dp"
android:layout_marginStart="27dp"
android:text="-"
android:textSize="24sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center_horizontal"
android:orientation="horizontal">
<Button
android:id="#+id/btn1"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="1"
android:textSize="24sp" />
<Button
android:id="#+id/btn2"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="2"
android:textSize="24sp" />
<Button
android:id="#+id/btn3"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="3"
android:textSize="24sp" />
<Button
android:id="#+id/sumbtn"
android:layout_width="68dp"
android:layout_height="51dp"
android:layout_marginStart="27dp"
android:text="+"
android:textSize="24sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center_horizontal"
android:orientation="horizontal">
<Button
android:id="#+id/dotbtn"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="."
android:textSize="24sp" />
<Button
android:id="#+id/zerobtn"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="0"
android:textSize="24sp" />
<Button
android:id="#+id/equalbtn"
android:layout_width="68dp"
android:layout_height="51dp"
android:text="="
android:textSize="24sp" />
<Button
android:id="#+id/divbtn"
android:layout_width="68dp"
android:layout_height="51dp"
android:layout_marginStart="27dp"
android:text="/"
android:textSize="24sp" />
</LinearLayout>
</LinearLayout>
Logcat: (Errors)
Link to Logcat: https://pastebin.com/hbwZVUZg

Delete the abstract keyword. then the line textarea= (EditText) findViewById(R.id.textarea); change for EditText textarea; and last put this on the onCreate() textarea = (EditText)findViewById(R.id.textarea);
Remember that you cannot instantiate an abstract class. here
And check how to debug here
public class CalculatorActivity extends AppCompatActivity implements View.OnClickListener {
Button btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, zerobtn, dotbtn, equalbtn, minusbtn, sumbtn, divbtn, mulbtn;
double num1, num2;
boolean sum, minus, div, mul;
EditText textarea;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator);
textarea = (EditText) findViewById(R.id.textarea);

Put this code in onCreate:
#Override
protected void onCreate(Bundle savedInstanceState)
{
...
textarea = (EditText)findViewById(R.id.textarea);
...
}

Check whether you are using dependencies of same version or not. There should not be any version conflict among dependencies.

Related

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D1 () function
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//layout.xml
<?xml version="1.0" encoding="utf-8"?>
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android:layout_height="200dp"
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to access to Spinner in your layout :
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Button onClick() causing force stop

Hello StackOverFlowGeeks!
Currently, I'm learning how to write a basic Android app, that has few buttons.
I have four activities(Java Classes) and four xmls.
I have the RegisterScreen.java that has two buttons(Register and Back button). Currently, I am trying to get back from this RegisterScreen.java to SignInScreen.java. The problem is that when I click on the back button it causes a failure and the app is forced to shut down...
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1) RegisterScreen.java
2) SignInScreen.java
3) RegisterScreen XML file
4) SignInScreen XML file
Thanks in advance.
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#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
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}
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#Override
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SignInScreen:
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#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
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#SuppressLint("SetTextI18n")
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TextView password = (TextView)findViewById(R.id.password_text);
Button signIn = (Button)findViewById(R.id.sign_in_button);
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<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
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android:layout_width="match_parent"
android:layout_height="match_parent"
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android:layout_height="match_parent"
android:orientation="vertical">
<TextView
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android:layout_width="match_parent"
android:layout_height="wrap_content"
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android:textAlignment="center"
android:textColor="#android:color/black"
android:textSize="24sp"
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android:layout_width="match_parent"
android:layout_height="wrap_content"
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android:ems="10"
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android:layout_width="match_parent"
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android:ems="10"
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android:layout_height="wrap_content"
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android:layout_width="match_parent"
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android:hint="#string/confirm_email"
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android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/enter_password"
android:inputType="textPassword" />
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android:id="#+id/password_confirm"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/confirm_password"
android:inputType="textPassword" />
<LinearLayout
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android:layout_height="match_parent"
android:orientation="horizontal">
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android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
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android:textAllCaps="false"
android:textSize="18sp"
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android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
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android:onClick="onClickBackButton"
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android:textAllCaps="false"
android:textSize="18sp"
android:textStyle="bold" />
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<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.megat0n.startproject.SignInScreen">
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android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
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android:id="#+id/text_view"
android:layout_width="match_parent"
android:layout_height="56dp"
android:text="#string/welcome_to_the_home_screen"
android:textAlignment="center"
android:textColor="#android:color/black"
android:textSize="24sp"
android:textStyle="bold" />
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android:id="#+id/username_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/username"
android:inputType="textPersonName"
android:textAlignment="center"
android:textStyle="bold" />
<EditText
android:id="#+id/password_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/password"
android:inputType="textPassword"
android:textAlignment="center"
android:textStyle="bold" />
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android:id="#+id/sign_in_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="onClickSignInButton"
android:text="#string/sign_in"
android:textAlignment="center"
android:textAllCaps="false"
android:textSize="18sp"
android:textStyle="bold" />
<Button
android:id="#+id/register_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="onClickRegisterButton"
android:text="#string/register"
android:textAlignment="center"
android:textAllCaps="false"
android:textSize="18sp"
android:textStyle="bold" />
<Button
android:id="#+id/reset_password_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="onClickResetPasswordButton"
android:text="#string/reset_password"
android:textAlignment="center"
android:textAllCaps="false"
android:textSize="18sp"
android:textStyle="bold" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>

Use this onClickBackButton() instead of yours. If you use onClick attribute in your layout, you don't need creating button and click listener.
public void onClickBackButton(View view) {
Intent intent = new Intent(MainActivity.this, Main2Activity.class);
startActivity(intent);
}

Try in RegisterScreen use onBackPressed() method:
backBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onBackPressed();
}
});

android calculator buttons doesnt work

I'm trying to make a basic android calculator. when i press button numbers show at edittext but nothing's happining. Thanks for any help.
here is my MainActivity.java`
public class MainActivity extends AppCompatActivity {
private EditText Scr;
private float NumerBf;
private String Operation;
private ButtonClickListener btnClick;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
Scr=(EditText)findViewById(R.id.editText3);
Scr.setEnabled(false);
int idList[]={R.id.button0,R.id.button1,R.id.button1,R.id.button2,R.id.button3,R.id.button4,R.id.button5,
R.id.button6,R.id.button7,R.id.button8,R.id.button9,R.id.buttonAdd,R.id.buttonC,R.id.buttonDivide,
R.id.buttonEqu,R.id.buttonMinus,R.id.buttonMultiply};
for(int id:idList){
View v=(View)findViewById(id);
v.setOnClickListener(btnClick);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
public void mMath(String str){
NumerBf=Float.parseFloat(Scr.getText().toString());
Operation =str;
Scr.setText("0");
}
public void getKeyboard(String str){
String SrcCurrent = Scr.getText().toString();
if(SrcCurrent.equals("0"))
SrcCurrent="";
SrcCurrent +=str;
Scr.setText(SrcCurrent);
}
public void mResult(){
float NumAf=Float.parseFloat(Scr.getText().toString());
float result=0;
if(Operation.equals("+")){
result=NumAf+NumerBf;
}
else if(Operation.equals("-")){
result=NumerBf-NumAf;
}
else if(Operation.equals("*")){
result=NumAf*NumerBf;
}
else if(Operation.equals("/")){
result=NumerBf/NumAf;
}
Scr.setText(String.valueOf(result));
}
private class ButtonClickListener implements View.OnClickListener {
public void onClick(View v){
switch(v.getId()){
case R.id.buttonC: //ekranı temizle
Scr.setText("0");
NumerBf=0;
Operation="";
break;
case R.id.buttonAdd:
mMath("+");
break;
case R.id.buttonMinus:
mMath("-");
break;
case R.id.buttonMultiply:
mMath("*");
break;
case R.id.buttonDivide:
mMath("/");
break;
case R.id.buttonEqu:
mResult();
break;
default:
String numb= ((Button) v).getText().toString();
getKeyboard(numb);
break;
}
}
}
`
and here is my content_main.xml`
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
android:id="#+id/button3"
android:textStyle="bold"
android:layout_above="#+id/button5"
android:layout_toRightOf="#+id/button5"
android:layout_toEndOf="#+id/button5" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="C"
android:id="#+id/buttonC"
android:textStyle="bold"
android:longClickable="true"
android:layout_alignTop="#+id/button3"
android:layout_alignRight="#+id/buttonDivide"
android:layout_alignEnd="#+id/buttonDivide"
android:layout_alignLeft="#+id/buttonDivide"
android:layout_alignStart="#+id/buttonDivide" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
android:id="#+id/button1"
android:textStyle="bold"
android:layout_above="#+id/button4"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4"
android:id="#+id/button4"
android:textStyle="bold"
android:layout_above="#+id/button7"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="6"
android:id="#+id/button6"
android:textStyle="bold"
android:layout_below="#+id/button3"
android:layout_toRightOf="#+id/button5"
android:layout_toEndOf="#+id/button5" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="5"
android:id="#+id/button5"
android:textStyle="bold"
android:layout_above="#+id/button8"
android:layout_toRightOf="#+id/button4"
android:layout_toEndOf="#+id/button4" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="8"
android:id="#+id/button8"
android:textStyle="bold"
android:layout_above="#+id/button0"
android:layout_toRightOf="#+id/button7"
android:layout_toEndOf="#+id/button7" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="7"
android:id="#+id/button7"
android:textStyle="bold"
android:layout_below="#+id/button5"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="9"
android:id="#+id/button9"
android:textStyle="bold"
android:layout_alignTop="#+id/button8"
android:layout_toRightOf="#+id/button8"
android:layout_toEndOf="#+id/button8" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
android:id="#+id/button0"
android:textStyle="bold"
android:layout_above="#+id/buttonMinus"
android:layout_alignLeft="#+id/button8"
android:layout_alignStart="#+id/button8" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
android:id="#+id/buttonAdd"
android:textStyle="bold"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:id="#+id/buttonMinus"
android:textStyle="bold"
android:layout_alignTop="#+id/buttonAdd"
android:layout_alignLeft="#+id/button0"
android:layout_alignStart="#+id/button0" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="*"
android:id="#+id/buttonMultiply"
android:textStyle="bold"
android:layout_alignBottom="#+id/buttonMinus"
android:layout_toRightOf="#+id/buttonMinus"
android:layout_toEndOf="#+id/buttonMinus" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="/"
android:id="#+id/buttonDivide"
android:textStyle="bold"
android:layout_alignTop="#+id/buttonMultiply"
android:layout_toRightOf="#+id/buttonMultiply"
android:layout_toEndOf="#+id/buttonMultiply" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="="
android:id="#+id/buttonEqu"
android:textStyle="bold"
android:layout_below="#+id/buttonMinus"
android:layout_alignLeft="#+id/buttonMinus"
android:layout_alignStart="#+id/buttonMinus" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/editText3"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_toLeftOf="#+id/button3"
android:gravity="right"
android:text="0" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
android:id="#+id/button2"
android:textStyle="bold"
android:layout_alignBottom="#+id/button3"
android:layout_toLeftOf="#+id/button3"
android:layout_toStartOf="#+id/button3" />
`

ButtonClickListener btnClick is not initialized. You are setting a null onClickListener. So it makes sence that pressing the buttons does nothing

Several layouts in one xml layout - doesn't append text after button clicked

I was searching solution for my problem, but I didn't find any.
I'm creating android application and one activity layout has several activities:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".EkranGlowny"
android:id="#+id/aaa"
android:background="#ffff8000"
android:orientation="horizontal">
<LinearLayout
android:orientation="vertical"
android:layout_width="130dp"
android:layout_height="540dp"
android:background="#ffff8000"
android:layout_gravity="right"
android:baselineAligned="false"
android:clickable="false"
android:focusable="false"
android:weightSum="1">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Krystian Pruchnik"
android:id="#+id/waiter_name"
android:textSize="20sp"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:layout_marginLeft="5dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ID: 180881"
android:id="#+id/waiter_id"
android:textSize="20sp"
android:layout_marginLeft="5dp"
android:layout_marginBottom="30dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Zamówienie"
android:textSize="20sp"
android:id="#+id/order"
android:layout_marginBottom="10dp" />
<TextView
android:layout_width="130dp"
android:layout_height="match_parent"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="#+id/viewOrder"
android:layout_marginRight="5dp"
android:background="#ffffffff" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="58dp"
android:layout_height="540dp"
android:background="#69ff8300"
android:weightSum="1"
android:baselineAligned="false">
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="1"
android:id="#+id/button1" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="2"
android:id="#+id/button2" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="3"
android:id="#+id/button3" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="4"
android:id="#+id/button4" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="5"
android:id="#+id/button5" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="6"
android:id="#+id/button6" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="7"
android:id="#+id/button7" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="8"
android:id="#+id/button8" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="9"
android:id="#+id/button9" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="0"
android:id="#+id/button0" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="fill_parent"
android:layout_height="49dp"
android:text="#string/clear_button"
android:id="#+id/clear_button"
android:layout_gravity="top"
android:background="#ffff0000"
android:textColor="#ffffffff"
android:textSize="11sp"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
android:layout_marginBottom="5dp" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="540dp"
android:background="#69ff8300"
android:weightSum="1"
android:baselineAligned="false">
<ScrollView
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="480dp"
android:background="#ffff8000">
<TableLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableRow
android:id="#+id/tableRow1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dip" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Zestawy"
android:id="#+id/zestawy"
android:textAlignment="center"
android:textIsSelectable="false"
android:layout_span="3"/>
</TableRow>
<TableRow
android:id="#+id/tableRow2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dip">
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa1"
android:id="#+id/meal1"
android:layout_column="0"
android:layout_weight="1"/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa2"
android:id="#+id/meal2"
android:layout_column="1"
android:layout_weight="1"/>
</TableRow>
<TableRow
android:id="#+id/tableRow3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dip" >
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa3"
android:id="#+id/meal3"
android:layout_column="0"
android:layout_weight="1"/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa4"
android:id="#+id/meal4"
android:layout_column="1"
android:layout_weight="1"/>
</TableRow>
<TableRow
android:id="#+id/tableRow4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dip" >
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa5"
android:id="#+id/meal5"
android:layout_column="0"
android:layout_weight="1"/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa6"
android:id="#+id/meal6"
android:layout_column="1"
android:layout_weight="1"/>
</TableRow>
<TableRow
android:id="#+id/tableRow5"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dip" >
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa7"
android:id="#+id/meal7"
android:layout_column="0"
android:layout_weight="1"/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa8"
android:id="#+id/meal8"
android:layout_column="1"
android:layout_weight="1"/>
</TableRow>
<TableRow
android:id="#+id/tableRow6"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dip" >
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa9"
android:id="#+id/meal9"
android:layout_column="0"
android:layout_weight="1"/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa10"
android:id="#+id/meal10"
android:layout_column="1"
android:layout_weight="1"/>
</TableRow>
<TableRow
android:id="#+id/tableRow7"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dip" >
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa11"
android:id="#+id/meal11"
android:layout_column="0"
android:layout_weight="1"/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa12"
android:id="#+id/meal12"
android:layout_column="1"
android:layout_weight="1"/>
</TableRow>
<TableRow
android:id="#+id/tableRow8"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dip" >
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa13"
android:id="#+id/meal13"
android:layout_column="0"
android:layout_weight="1"/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/potrawa14"
android:id="#+id/meal14"
android:layout_column="1"
android:layout_weight="1"/>
</TableRow>
</TableLayout>
</ScrollView>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#69ff8300"
android:weightSum="1"
android:baselineAligned="false">
<Button
android:layout_width="48dp"
android:layout_height="34dp"
android:text="VOID"
android:id="#+id/anuluj"
android:background="#ffff2800" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Rozlicz"
android:id="#+id/rozlicz"
android:layout_weight="1.18" />
</LinearLayout>
</LinearLayout>
I want that if I click some button (from second and third linear layout) it'll put text in TextView (id: viewOrder in first linear layout). Whenever I try this, it's showing message: "Unfortunately WaiterApp is stopped" and application crashes.
My Main Activity in java:
public class EkranGlowny extends ActionBarActivity implements OnClickListener{
Button summary;
Context context;
Button but0;
Button but1;
Button but2;
Button but3;
Button but4;
Button but5;
Button but6;
Button but7;
Button but8;
Button but9;
Button butClr;
Button voiD;
Button meal1;
Button meal2;
Button meal3;
Button meal4;
Button meal5;
Button meal6;
Button meal7;
Button meal8;
Button meal9;
Button meal10;
Button meal11;
Button meal12;
Button meal13;
Button meal14;
TextView viewOrder;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ekran_glowny);
setupVariables();
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.rozlicz:
context = getApplicationContext();
Intent intent = new Intent(context, ResumeScreen.class);
startActivity(intent);
break;
/*case R.id.button0:
viewOrder.append(but0.getText().toString());
break;
case R.id.button1:
viewOrder.append("1");
break;
case R.id.button2:
viewOrder.append("2");
break;*/
default:
viewOrder.append(((Button) v).getText().toString());
break;
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
//implementacja zmiennych
private void setupVariables() {
summary = (Button) findViewById(R.id.rozlicz);
summary.setOnClickListener(this);
but0 = (Button) findViewById(R.id.button0);
but0.setOnClickListener(this);
but1 = (Button) findViewById(R.id.button1);
but1.setOnClickListener(this);
but2 = (Button) findViewById(R.id.button2);
but2.setOnClickListener(this);
but3 = (Button) findViewById(R.id.button3);
but3.setOnClickListener(this);
but4 = (Button) findViewById(R.id.button4);
but4.setOnClickListener(this);
but5 = (Button) findViewById(R.id.button5);
but5.setOnClickListener(this);
but6 = (Button) findViewById(R.id.button6);
but6.setOnClickListener(this);
but7 = (Button) findViewById(R.id.button7);
but7.setOnClickListener(this);
but8 = (Button) findViewById(R.id.button8);
but8.setOnClickListener(this);
but9 = (Button) findViewById(R.id.button9);
but9.setOnClickListener(this);
butClr = (Button) findViewById(R.id.clear_button);
butClr.setOnClickListener(this);
meal1 = (Button) findViewById(R.id.meal1);
meal1.setOnClickListener(this);
meal2 = (Button) findViewById(R.id.meal2);
meal2.setOnClickListener(this);
meal3 = (Button) findViewById(R.id.meal3);
meal3.setOnClickListener(this);
meal4 = (Button) findViewById(R.id.meal4);
meal4.setOnClickListener(this);
meal5 = (Button) findViewById(R.id.meal5);
meal5.setOnClickListener(this);
meal6 = (Button) findViewById(R.id.meal6);
meal6.setOnClickListener(this);
meal7 = (Button) findViewById(R.id.meal7);
meal7.setOnClickListener(this);
meal8 = (Button) findViewById(R.id.meal8);
meal8.setOnClickListener(this);
meal9 = (Button) findViewById(R.id.meal9);
meal9.setOnClickListener(this);
meal10 = (Button) findViewById(R.id.meal10);
meal10.setOnClickListener(this);
meal11 = (Button) findViewById(R.id.meal11);
meal11.setOnClickListener(this);
meal12 = (Button) findViewById(R.id.meal12);
meal12.setOnClickListener(this);
meal13 = (Button) findViewById(R.id.meal13);
meal13.setOnClickListener(this);
meal14 = (Button) findViewById(R.id.meal14);
meal14.setOnClickListener(this);
voiD = (Button) findViewById(R.id.anuluj);
voiD.setOnClickListener(this);
viewOrder = (TextView) findViewById(R.id.viewOrder);
}
}
I tried viewOrder.setText and viewOrder.append and nothing is working.
Is the problem is that TextView and buttons are in different layouts?
Could you tell me what I'm doing wrong?
edit:
In logcat I get:
06-07 14:17:40.290 7755-7755/com.example.krystian.waiterapp W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x40da51f8)
06-07 14:17:40.290 7755-7755/com.example.krystian.waiterapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.krystian.waiterapp.EkranGlowny.onClick(EkranGlowny.java:78)
at android.view.View.performClick(View.java:3524)
at android.view.View$PerformClick.run(View.java:14194)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4476)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:816)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:583)
at dalvik.system.NativeStart.main(Native Method)

Check your xml file name. It should be ekran_glowny.
My guess is you showed xml code from different xml file.

How to make Views with an Invisible attribute 'Visible' after clicking a button

I have several Views, text views, and a button that have the android:visibility="invisible" attribute. My goal is to click a button that resides above these 'invisible' widgets, so that these widgets will become visible. I created another java class called 'VisibilityActivity.java" and tried the following method. But for some reason when I run the app, the button doesn't do anything. I don't know what I'm missing.
Here's the code:
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class VisibilityActivity extends Activity {
private View mVictim;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.new_property3);
mVictim = findViewById(R.id.horizontalRule1);
mVictim = findViewById(R.id.TextView03);
mVictim = findViewById(R.id.horizontalRule2);
Button submitRating = (Button) findViewById(R.id.submitRatingButton);
submitRating.setOnClickListener(mVisibleListener);
}
OnClickListener mVisibleListener = new OnClickListener() {
public void onClick(View v) {
mVictim.setVisibility(View.INVISIBLE);
}
};
}
Here is the xml:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#drawable/custom_background"
android:isScrollContainer="true"
android:orientation="vertical"
android:paddingTop="10dp" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_gravity="center"
android:text="#string/ratingsInfo"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#color/black1" />
<View
android:layout_width="fill_parent"
android:layout_height="2dp"
android:background="#color/black1"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
android:layout_marginBottom="5dp" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="#string/yourRating"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/black1" />
<RatingBar
android:id="#+id/ratingBar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="10dp" />
<Button
android:id="#+id/submitRatingButton"
android:layout_width="275dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="10dp"
android:background="#drawable/custom_button"
android:text="#string/submitRating"
android:textColor="#color/black1" />
<View
android:id="#+id/horizontalRule1"
android:layout_width="fill_parent"
android:layout_height="2dp"
android:background="#color/black1"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
android:layout_marginBottom="5dp"
android:visibility="invisible" />
<TextView
android:id="#+id/TextView03"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_gravity="center"
android:text="#string/summaryInfo"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#color/black1"
android:visibility="invisible" />
<View
android:id="#+id/horizontalRule2"
android:layout_width="fill_parent"
android:layout_height="2dp"
android:background="#color/black1"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
android:layout_marginBottom="5dp"
android:visibility="invisible" />
<TextView
android:id="#+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="#string/ourRating"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/black1"
android:visibility="invisible" />
<RatingBar
android:id="#+id/ratingBar2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:stepSize=".01"
android:layout_marginBottom="10dp"
android:visibility="invisible" />
<TextView
android:id="#+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="#string/overallRating"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/black1"
android:visibility="invisible" />
<RatingBar
android:id="#+id/ratingBar3"
android:color="#color/black1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:stepSize=".01"
android:layout_marginBottom="40dp"
android:visibility="invisible" />
<Button
android:id="#+id/saveContinueButton3"
android:layout_width="275dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="15dp"
android:background="#drawable/custom_button"
android:text="#string/saveContinue"
android:textColor="#color/black1"
android:onClick="onSaveAndContinue3Clicked"
android:visibility="invisible" />
</LinearLayout>
</ScrollView>
Thanks. Help would be greatly appreciated!

I am updating user936414's answer.
OnClickListener mVisibleListener = new OnClickListener() {
public void onClick(View v) {
if( mText.getVisibility() == View.INVISIBLE )
mText.setVisibility(View.VISIBLE);
else
mText.setVisibility(View.INVISIBLE);
if( mRule1.getVisibility() == View.INVISIBLE )
mRule1.setVisibility(View.VISIBLE);
else
mRule1.setVisibility(View.INVISIBLE);
if( mRule2.getVisibility() == View.INVISIBLE )
mRule2.setVisibility(View.VISIBLE);
else
mRule2.setVisibility(View.INVISIBLE);
}
};
Also you might want to experiment with View.GONE.

findViewById(R.id.ratingBar3).setVisibility(View.VISIBLE);
findViewById(R.id.saveContinueButton3).setVisibility(View.VISIBLE);
you made it invisible view invisible again.. try the above code

Try
public class VisibilityActivity extends Activity {
private TextView mText;
private View mRule1, mRule2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.new_property3);
mText= (TextView)findViewById(R.id.horizontalRule1);
mRule1 = findViewById(R.id.TextView03);
mRule2 = findViewById(R.id.horizontalRule2);
Button submitRating = (Button) findViewById(R.id.submitRatingButton);
submitRating.setOnClickListener(mVisibleListener);
}
OnClickListener mVisibleListener = new OnClickListener() {
public void onClick(View v) {
mText.setVisibility(View.VISIBLE);
mRule1.setVisibility(View.VISIBLE);
mRule2.setVisibility(View.VISIBLE);
}
};
}

Button submitRating = (Button) findViewById(R.id.submitRatingButton);
submitRating.setOnClickListener(new View.onClickListener)
{
#Override
public void onClick(View v)
{
//Insert your code here
}
}

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

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Put this code in onCreate: #Override protected void onCreate(Bundle savedInstanceState) { ... textarea = (EditText)findViewById(R.id.textarea); ... }

Check whether you are using dependencies of same version or not. There should not be any version conflict among dependencies.

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