I'm still learning and I've tried to figure this out and I figured I'd ask the experts. Any ideas?
I get the error on this line:
final Button btn = (Button) findViewById ([btnIds]);
public class choiceTest extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.atcchoice);
}
final OnClickListener listener = new OnClickListener() {
public void onClick(View v){
switch(v.getId()){
case R.id.sec1:
break;
case R.id.sec2:
break;
case R.id.sec3:
break;
}
}
};
final int[] btnIds = new int[]{R.id.sec1, R.id.sec2, R.id.sec3};{
for(int i = 0; i < btnIds.length; i++) {
final Button btn = (Button) findViewById ([btnIds]);
btn.setOnClickListener(listener);
}
}
}
Also, this is for a downloader program and I am using Async to download my files. What could I add to the above code to change my downloader URL to a different one? Otherwise I will have a very long code... Here is how download URL code.
private void startDownload() {
DownloadFile downloadFile = new DownloadFile();
downloadFile.execute("http://www.website.com/document.pdf");
}
The async code to download it:
class DownloadFile extends AsyncTask<String, Integer, String> {
URL url = new URL(aurl[0]);
You access an array like this:
Button btn = (Button) findViewById( btnIds[i] );
your are passing whole array.
change it:
for(int i = 0; i < btnIds.length; i++) {
final Button btn = (Button) findViewById ([btnIds]);
btn.setOnClickListener(listener);
}
with
for(int i = 0; i < btnIds.length; i++) {
final Button btn = (Button) findViewById (btnIds[i]);
btn.setOnClickListener(listener);
}
Related
This is my code for a button. Whenever i click this the app shuts down!I am unable to understand why it's happening?
In my code, I am trying to check if values from dynamically created EditText field has been stored on my variable array values[] and bValues[];
I looked for many answers here on how to retrieve value from dynamic edittext fields. And I came up with this from my understanding.
Can anyone tell me where am I going wrong? And a corrected demo code will be of help!
public class MainActivity extends AppCompatActivity {
private static int a;
private static EditText ainput;
private static Button btn, set;
TextView equal_sign;
private static TableLayout tableLayout;
private static LinearLayout bMatrix;
List<EditText> allEds = new ArrayList<EditText>(a*a);
double[] values = new double[(allEds.size())];
List<EditText> bMatrixValues = new ArrayList<EditText>(a);
double[] bValues = new double[bMatrixValues.size()];
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ainput = (EditText) findViewById(R.id.a);
btn = (Button) findViewById(R.id.btn);
set = (Button)findViewById(R.id.set);
tableLayout = (TableLayout) findViewById(R.id.table1);
equal_sign = (TextView) findViewById(R.id.equal_sign);
bMatrix = (LinearLayout) findViewById(R.id.bMatrix);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
a = Integer.parseInt(ainput.getText().toString());
tableLayout.removeAllViews();
createMatrix();
}
});
set.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
for (int i = 0; i < allEds.size(); i++){
values[i] = Double.parseDouble(allEds.get(i).getText().toString());
}
for (int j = 0 ; j < bMatrixValues.size(); j++){
bValues[j] = Double.parseDouble(bMatrixValues.get(j).getText().toString());
}
if (allEds.size() > 0 && bMatrixValues.size() > 0){
Toast.makeText(MainActivity.this, "Main Matrix Values inserted!", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this, "Insertion failed!", Toast.LENGTH_SHORT).show();
}
}
});
}
private void createMatrix() {
int p = 1;
for (int i = 0; i < a; i++) {
TableRow row = new TableRow(this);
TableRow.LayoutParams lp = new
TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,
TableRow.LayoutParams.WRAP_CONTENT);
lp.gravity = Gravity.CENTER;
row.setLayoutParams(lp);
EditText magicField;
for (int j = 0; j < a; j++) {
magicField = new EditText(MainActivity.this);
allEds.add(magicField);
magicField.setId((p));
magicField.setHint("et-" + (Integer.toString(p)));
magicField.setGravity(Gravity.CENTER);
magicField.setWidth(100);
row.addView(magicField, j);
p++;
}
tableLayout.addView(row, i);
}
bMatrix.removeAllViews();
equal_sign.setText("=");
equal_sign.setTextSize(30);
createBMatrix();
}
private void createBMatrix() {
int id = (a * a) + 1;
for (int s = 0; s < a; s++) {
final EditText b = new EditText(this);
bMatrixValues.add(b);
b.setId(id);
b.setHint("b-" + (Integer.toString(s + 1)));
b.setGravity(Gravity.CENTER);
b.setWidth(100);
bMatrix.addView(b);
id++;
}
}
}
And this is the output screen!
Matrix style edit text field gets created nicely. But when i give values to those fields and click on set value button app shuts down..
I'm in the beginning of my learning how to make apps. I want to make an app which should display randomized inputted tasks to do for the user. Firstly user should choose how many tasks would like to create and then write down tasks in EditText. I am able to create particular amount of EditText but I have no clue how to display all EditText input after pressing button. I have many versions of the code but non of them work. I got stuck and I need advice.
Here is one of my code version for the second activity.
public class TaskActivity extends AppCompatActivity {
LinearLayout containerLayout;
TextView receiverTV;
TextView tv;
TextView displayTaskTv;
EditText et;
Button btn;
Button randomTaskBtn;
int i = 0;
int size;
String inputEditText;
String inputTextView;
String stringsEt[];
String stringsTv [];
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_task);
containerLayout = (LinearLayout) findViewById(R.id.linear_layout);
receiverTV = (TextView) findViewById(R.id.receiver_textView);
Intent intent = getIntent();
int number = intent.getIntExtra("Number", defaultValue);
receiverTV.setText("You have chosen to add: " + number + " tasks!");
createEtTvBtn(number);
createBtn();
createTextView();
}
public void createEtTvBtn(int number) {
for (i = 1; i <= number; i++) {
tv = new TextView(this);
tv.setText("Task nr: " + i);
tv.setPadding(16, 16, 16, 16);
tv.setTextColor(Color.parseColor("#008b50"));
tv.setTextSize(20);
tv.setId(i + value);
containerLayout.addView(tv);
et = new EditText(this);
et.setHint("Enter task nr: " + i);
et.setId(i + value);
et.setLines(2);
containerLayout.addView(et);
btn = new Button(this);
btn.setText("Confirm task nr: " + i);
btn.setId(i + value);
containerLayout.addView(btn);
final List<EditText> allEditText = new ArrayList<EditText>();
final List<TextView>allTextView = new ArrayList<TextView>();
final List<Button>allButton = new ArrayList<Button>();
String[] stringsEditText = new String[(allEditText.size())];
String[] stringsTextView = new String[(allTextView.size())];
String[] stringsBtn = new String[(allButton.size())];
for(int i=0; i < allEditText.size(); i++){
stringsEditText[i] = allEditText.get(i).getText().toString();
}
for (int i=0; i < allTextView.size(); i++) {
stringsTextView[i] = allTextView.get(i).getText().toString();
size = allTextView.get(i).getText().toString().length();
}
for(int i=0; i < allButton.size(); i++){
stringsBtn[i] = allButton.get(i).getText().toString();
}
allTextView.add(tv);
allEditText.add(et);
allButton.add(btn);
allButton.get(0).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
inputEditText = allEditText.get(0).getText().toString();
stringsEt = new String[] {allEditText.get(0).getText().toString()};
if (inputEditText.length() > 0) {
allTextView.get(0).setText(inputEditText);
allEditText.add(allEditText.get(0));
allEditText.get(0).setText("");
}
else if (inputEditText.length() ==0){
Toast.makeText(TaskActivity.this, "You need to write down your task", Toast.LENGTH_LONG).show();
}
inputTextView = allTextView.get(0).getText().toString();
stringsTv = new String[] {allTextView.get(0).getText().toString()};
if (inputTextView.length() > 0) {
allTextView.get(0).getText();
allTextView.add(allTextView.get(0));
}
}
});
}
}
private Button createBtn() {
randomTaskBtn = new Button(this);
randomTaskBtn.setText("Task");
containerLayout.addView(randomTaskBtn);
randomTaskBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
double luckyTask = Math.random();
luckyTask *=size;
int luckyIndex = (int)luckyTask;
displayTaskTv.setText(stringsTv[luckyIndex]);
}
});
return randomTaskBtn;
}
private TextView createTextView() {
displayTaskTv = new TextView(this);
displayTaskTv.setTextSize(20);
displayTaskTv.setTextColor(Color.parseColor("#dd2626"));
displayTaskTv.setText("");
containerLayout.addView(displayTaskTv);
return displayTaskTv;
}
}
Thank you for any constructive advices.
I am sure my code is big mess. I wanted to created more methods but I didn't succeed.
This is what you should do
Step 1 -
Create multiple EditTexts and store each one of them in an ArrayList say myEditTextList.
Step 2- Take data from all edit texts
String str = ""
for(EditText et: myEditTextList) {
str += et.getText().toString();
}
Step 3- Display data in str wherever you want.
This is a sample try code. I am adding checkbox and textview in the table row by using loop. Everything is working fine except that whenever I am trying to take out(checkBox, Textview) from another method, I am not able to get it. I don't know how to solve this. I tried setId but I couldn't get the Id.
protected void onCreate(Bundle savedInstanceState) {
TableLayout tl = (TableLayout)findViewById(R.id.tableLayout1);
TableRow[] row = new TableRow[5];
TextView tv[] = new TextView[5];
CheckBox[] cb = new CheckBox[5];
Button clickTestRow;
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
for(int j = 0; j < 5; j ++){
row[j] = new TableRow(this);
tl.addView(row[j]);
tv[j] = new TextView(this);
cb[j] = new CheckBox(this);
tv[j].setText("This is text");
row[j].addView(cb[j]);
row[j].addView(tv[j]);
if(j == 0)
cb[j].setChecked(true);
}
clickTestRow = (Button) findViewById(R.id.clickTestRow);
clickTestRow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
TableLayout tlid = (TableLayout) findViewById(R.id.tableLayout1);
for(int i = 0; i < 5; i ++){
if(cb[i].isChecked()){
tlid.removeView(row[i]);
}
}
}
});
This is untested, but try this for now.
Key points here are
Fields for your views
Call setContentView before using findViewById
final variables for those that you are trying to use within an anonymous class (the onClickListener)
public class MainActivity extends Activity {
private TableLayout tl;
private Button clickTestRow;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tl = (TableLayout)findViewById(R.id.tableLayout1);
clickTestRow = (Button) findViewById(R.id.clickTestRow);
final TableRow[] row = new TableRow[5];
final TextView tv[] = new TextView[5];
final CheckBox[] cb = new CheckBox[5];
for(int j = 0; j < 5; j ++){
row[j] = new TableRow(this);
tl.addView(row[j]);
tv[j] = new TextView(this);
cb[j] = new CheckBox(this);
tv[j].setText("This is text");
row[j].addView(cb[j]);
row[j].addView(tv[j]);
}
cb[0].setChecked(true);
clickTestRow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
for(int i = 0; i < 5; i ++){
if(cb[i].isChecked()){
tl.removeView(row[i]);
}
}
}
});
}
}
I want to add a wait till, Button (Enter) is pressed function to my code But i am still new to this.
I know there are some errors in my code I was playing around with it, But what I want to do is when I press the line Button I want it to display Input X,Y,Z then wait till enter is pressed to execute the rest of my code I want to add in. How would I implement something like this in my code?
Here is my MainActivity Class:
public class MainActivity extends Activity implements OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button enter = (Button) findViewById(R.id.enter);
Button line = (Button) findViewById(R.id.line);
Button arc = (Button) findViewById(R.id.arc);
line.setOnClickListener(this);
enter.setOnClickListener(this);
arc.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
TextView vector = (TextView) findViewById(R.id.point);
TextView index = (TextView) findViewById(R.id.index);
TextView info = (TextView) findViewById(R.id.info);
EditText cl = (EditText) findViewById(R.id.editText1);
DrawingUtils call = new DrawingUtils();
switch (v.getId()) {
case R.id.line:
info.setText("Input X,Y,Z");
// This Is Where the Wait Function Will GO
vector.setText(call.addVertice());
index.setText("1");
break;
case R.id.enter:
String In = cl.getText().toString();
call.setInputCoords(In);
break;
case R.id.arc:
info.setText("Enter Vertice1 ");
// Code for entering Vertice1(Also has wait function)
info.setText("Enter Vertice2");
// Code for entering Vertice2(Also has wait function)
info.setText("Enter Height");
//Code for entering Height(Also has wait function)
}
}
}
Here is my DrawingUtils Class:
public class DrawingUtils {
String inputCoords;
String[] vertice;
public String getInputCoords() {
return inputCoords;
}
public void setInputCoords(String inputCoords) {
this.inputCoords = inputCoords;
}
public String addVertice() {
int i = 0;
vertice = inputCoords.split(",");
return vertice[i];
}
}
I think this is what you are after. Apologies if not!
Use a boolean flag to handle state within your app. This way you can execute different code if something has happened.
boolean enterPressed = false;
#Override
public void onClick(View v) {
TextView vector = (TextView) findViewById(R.id.point);
TextView index = (TextView) findViewById(R.id.index);
TextView info = (TextView) findViewById(R.id.info);
EditText cl = (EditText) findViewById(R.id.editText1);
DrawingUtils call = new DrawingUtils();
switch (v.getId()) {
case R.id.line:
if (enterPressed) {
vector.setText(call.addVertice());
index.setText("1");
}
else {
info.setText("Input X,Y,Z");
}
break;
case R.id.enter:
String In = cl.getText().toString();
call.setInputCoords(In);
enterPressed = true;
break;
case R.id.arc:
info.setText("Enter Vertice1 ");
// Code for entering Vertice1
info.setText("Enter Vertice2");
// Code for entering Vertice2
}
}
I'm newbie in java. So the program should take the user entered text and if there is "a" it gonna play a-sound, if there is "b" it gonna play b-sound.And it must play this sounds one by one even if there are multiple "a" or "b". Here is my code:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button bStart = (Button) findViewById(R.id.bStart);
final EditText etStart = (EditText) findViewById(R.id.etStart);
final EditText etFinish = (EditText) findViewById(R.id.etFinish);
final char[] arr = etStart.getText().toString().toCharArray();
final MediaPlayer as = MediaPlayer.create(R2d2Activity.this, R.raw.as);
final MediaPlayer bs = MediaPlayer.create(R2d2Activity.this, R.raw.bs);
final SoundPool sp;
final int a;
final int b;
final int t;
sp = new SoundPool(2, AudioManager.STREAM_MUSIC, 0);
a = sp.load(this, R.raw.as, 1);
b = sp.load(this, R.raw.bs, 1);
final String value = etStart.getText().toString();
final Thread timer = new Thread(new Runnable() {
#Override
public void run() {
try {
Thread.sleep(1300);
// Do some stuff
} catch (Exception e) {
e.getLocalizedMessage();
}
}
});
bStart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int n = 0;
String value;
String first;
value = etStart.getText().toString();
// TODO Auto-generated method stub
//actual code
for (int i=0; i<value.length(); i++){
first = etStart.getText().toString().substring(i, i+1);
if(first.contentEquals("a")){
as.start();
as.setOnCompletionListener(new OnCompletionListener(){
public void onCompletion(MediaPlayer arg0) {
//when finished
}
});
}else{
}
if(first.contentEquals("b")){
bs.start();
}else{
}
}
}
});
The problem is that it starts playing audio files all at one time. I tried to add some OnCompletionListener, but I don't know what to do with it. Help me please.
What you can do is
//define a variable to be used as index.
int audioindex = 0;
//Extract the files id into an array
int[] audioFileIds=new int[]{R.raw.as,R.raw.bs};
Then in your MediaPlayer onCompletionListener put something like following.
then in your OnCompletionListener.
mp.setOnCompletionListener(new OnCompletionListener(){
// #Override
public void onCompletion(MediaPlayer player) {
// File has ended, play the next one.
FunctionPlayFile(audioFileIds[audioindex]);
audioindex+=1; //increment the index to get the next audiofile
}
});