Can't get textview to display user output on android

Can't get textview to display user output on android - java

I'm trying to make a rudimentary app to take the user's name (input) and display their name reversed (output). However, I can't seem to get this code to display the output I want. I just came to Android. How do I display a string in the user output?
XML:
<RelativeLayout 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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".Main" >
<Button
android:id="#+id/reverse"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="166dp"
android:text="#string/reverse" />
<TextView
android:id="#+id/desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="34dp"
android:text="#string/desc"
android:textAppearance="?
android:attr/textAppearanceSmall" />
<EditText
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/desc"
android:layout_centerHorizontal="true"
android:layout_marginTop="48dp"
android:ems="10"
android:inputType="text">
<requestFocus />
</EditText>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/name"
android:layout_alignTop="#+id/reverse"
android:layout_marginTop="67dp"
android:text="#string/reversed"
android:textAppearance="?
android:attr/textAppearanceSmall" />
<TextView
android:id="#+id/displayName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/reverse"
android:layout_below="#+id/textView1"
android:layout_marginTop="46dp"
android:text="#string/medium_text"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
Java:
package com.example.basicapp;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Main extends Activity {
Button reverse;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class Reverser extends android.app.Activity {
TextView displayed = (TextView)findViewById(R.id.displayName);
EditText nametext = (EditText)findViewById(R.id.name);
String namestring = nametext.getText().toString();
public void onClickListener() {
reverse.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
String reverse = new StringBuffer(namestring).reverse().toString();
String dr = reverse;
displayed.setText(dr);
}
});
}
}
}
Thank you.

public class Main extends Activity {
Button reverse;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView displayed = (TextView)findViewById(R.id.displayName);
EditText nametext = (EditText)findViewById(R.id.name);
String namestring = nametext.getText().toString();
reverse=(Button)findViewById(R.id.reverse);//assuming you have button with id reverse
reverse.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
String reverse = new StringBuffer(namestring).reverse().toString();
String dr = reverse;
displayed.setText(dr);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

Related

listView won't populate from bottom

I'm making a chat activity for a school project and I want the newest messages at the bottom of the listView. Adding the code below does not work. I simply want the newest message to appear at the bottom and make the listView automatically scroll to the last list item. Thanks in advance!
android:transcriptMode="alwaysScroll"
android:stackFromBottom="true"
Link to image of current situation
XML:
<android.support.v7.widget.Toolbar
android:id="#+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#1a1a1a"
android:id="#+id/relativeLayout_Messages"
android:layout_below="#id/my_toolbar"
android:layout_alignBottom="#+id/imageView_Separator">
<ListView
android:id="#+id/listView_Messages"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:stackFromBottom="true"
/>
</RelativeLayout>
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/imageView_Separator"
android:background="#1a1a1a"
android:src="#drawable/seperator"
android:layout_above="#+id/relativeLayout_ChatInput"
/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:id="#+id/relativeLayout_ChatInput"
android:background="#1a1a1a">
<EditText
android:layout_width="wrap_content"
android:layout_height="50dp"
android:id="#+id/editText_ChatInput"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_marginStart="5dp"
android:background="#drawable/search_field"
android:layout_toStartOf="#+id/imageButton_Send"
android:layout_alignBottom="#+id/imageButton_Send"
android:inputType="textPersonName"
android:hint="#string/chat_field_hint"
android:textColor="#f4f5f6"
android:textColorHint="#f4f5f6"/>
<ImageButton
android:layout_width="32dp"
android:layout_height="32dp"
android:id="#+id/imageButton_Send"
android:background="#android:color/transparent"
android:src="#drawable/send_button"
android:scaleType="fitCenter"
android:layout_marginTop="10dp"
android:layout_marginStart="10dp"
android:layout_marginEnd="6dp"
android:layout_marginBottom="8dp"
android:layout_alignParentEnd="true"
android:onClick="sendButtonClicked"
/>
</RelativeLayout>
</RelativeLayout>
JAVA
package com.example.muhryn.resonatem;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.content.Context;
import android.view.inputmethod.InputMethodManager;
import android.widget.*;
import java.util.*;
public class ChatActivity extends AppCompatActivity{
public void hideKeyboard() {
try {
InputMethodManager imm=(InputMethodManager)this.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(this.getCurrentFocus().getWindowToken(), 0);
} catch (Exception ex) { }
}
private ListView chatListView;
private Button submitButton;
private EditText chatEditText;
private Chat chat;
private ArrayList receivedList=new ArrayList();
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
chatListView=(ListView)findViewById(R.id.listView_Messages);
chatEditText=(EditText)findViewById(R.id.editText_ChatInput);
chat=new Chat("A","Resonate");
chat.setListener(new Chat.Listener(){
public void received(final String received) {
System.out.println("Received: "+received);
runOnUiThread(new Runnable() {
public void run() {
hideKeyboard();
receivedList.add(0, received);
chatListView.setAdapter(new ChatList(ChatActivity.this, receivedList));
}
});
//////((ArrayAdapter)chatListView.getAdapter()).insert(received,0);
}
});
}
public void sendButtonClicked(View view){
String textToSubmit=chatEditText.getText().toString().trim();
if(textToSubmit.isEmpty())
return;
if(chat.submitted(textToSubmit)) {
receivedList.add(0,"Sent: "+textToSubmit);
chatListView.setAdapter(new ChatList(ChatActivity.this, receivedList));
} else
Toast.makeText(this,"Failed to submit "+textToSubmit+".",Toast.LENGTH_SHORT).show();
}
#Override
public void onStop () {
super.onStop();
chat.stop();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.chat_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.view_profile:
finish();
return true;
case R.id.report_match:
finish();
return true;
case R.id.add_match:
finish();
return true;
case R.id.unmatch:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}

Try the below code.
chatListView.smoothScrollByOffset(receivedList.size()-1);
It will scroll down to latest chat.

About Spinners and button interface

how do I combine the
slected item of 3 spinners i have created and link it to a button??
here is my code...
package com.example.nikhiljoshi.time_table;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
char branch1;
Spinner spbranch,spsem,spdiv;
ArrayAdapter<CharSequence>adapter;
ArrayAdapter<CharSequence>adapter1;
ArrayAdapter<CharSequence>adapter2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button Submit = (Button) findViewById(R.id.button);
spbranch = (Spinner)findViewById(R.id.spinner);
spsem = (Spinner)findViewById(R.id.spinner2);
spdiv = (Spinner)findViewById(R.id.spinner3);
adapter = ArrayAdapter.createFromResource(this,R.array.branch,android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spbranch.setAdapter(adapter);
spbranch.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
int i;
// branch1=spbranch.getItemAtPosition(i).toString();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
adapter1 = ArrayAdapter.createFromResource(this,R.array.sem,android.R.layout.simple_spinner_item);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spsem.setAdapter(adapter1);
adapter2 = ArrayAdapter.createFromResource(this,R.array.division,android.R.layout.simple_spinner_item);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spdiv.setAdapter(adapter2);
Submit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Toast.makeText(view, "this is my Toast message!!! =)",
// Toast.LENGTH_LONG).show();
// Intent intent = new Intent(v.getContext(), nik.class);
// startActivityForResult(intent, 0);
}
});
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();
}
});
}
#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;
}
#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);
}
}
layout...
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto" 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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/activity_main" tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Branch"
android:id="#+id/textView"
android:layout_marginTop="105dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="27dp"
android:layout_marginStart="27dp"
android:textSize="20dp" />
<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/spinner"
android:layout_marginLeft="34dp"
android:layout_marginStart="34dp"
android:layout_alignTop="#+id/textView"
android:layout_alignLeft="#+id/button"
android:layout_alignStart="#+id/button" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Sem"
android:id="#+id/textView2"
android:layout_below="#+id/spinner"
android:layout_alignLeft="#+id/textView"
android:layout_alignStart="#+id/textView"
android:layout_marginTop="30dp"
android:textSize="20dp" />
<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/spinner2"
android:layout_alignTop="#+id/textView2"
android:layout_alignLeft="#+id/spinner"
android:layout_alignStart="#+id/spinner" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Division"
android:id="#+id/textView3"
android:layout_below="#+id/spinner2"
android:layout_alignLeft="#+id/textView2"
android:layout_alignStart="#+id/textView2"
android:layout_marginTop="30dp"
android:textSize="20dp" />
<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/spinner3"
android:layout_alignTop="#+id/textView3"
android:layout_alignLeft="#+id/spinner2"
android:layout_alignStart="#+id/spinner2" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Submit"
android:id="#+id/button"
android:layout_below="#+id/spinner3"
android:layout_centerHorizontal="true"
android:layout_marginTop="48dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Enter the details"
android:id="#+id/textView4"
android:textSize="20dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
when i press the submit button, the following things should happen
for eg
if(branch=='cs'&& sem=='5' && div=='A')
then new activity
how do i do that?

You can use Spinner.getSelectedItem() to get the currently selected values from your three spinners, then use those values to determine if you should launch your Activity.

Adding a remove button in my item list

I am fairly new to Java and Android development. I am currently creating a shopping app and was looking at adding a "Remove" button to my Shopping Cart list.
Here is my current code for my list activity for my shopping cart, I am not really sure where to begin and some guidance would be greatly appreciated.
Thanks
package .shopper;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.support.v4.app.NavUtils;
public class CartListActivity extends ListActivity {
public class ProductListAdapter extends BaseAdapter {
private final Context context;
private List<Product> itemList;
public List<Product> getItemList() {
return itemList;
}
public void setItemList(List<Product> itemList) {
this.itemList = itemList;
}
public Context getContext() {
return context;
}
public ProductListAdapter(Context c) {
context = c;
}
#Override
public int getCount() {
if(itemList == null) return 0;
else return itemList.size();
}
#Override
public Object getItem(int position) {
if (itemList == null) return null;
else return itemList.get(position);
}
#Override
public long getItemId(int position) {
if (itemList == null) return 0;
else return itemList.get(position).hashCode();
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View cell = convertView;
if (cell == null) {
// get layout from mobile xml
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
cell = inflater.inflate(R.layout.adapter_product_list, parent, false);
}
Product p = itemList.get(position);
//set value into textview according to position
TextView textView = (TextView) cell.findViewById(R.id.product_title);
textView.setText(p.getProductName());
// add £ symbol
textView = (TextView) cell.findViewById(R.id.product_info);
textView.setText("Price: " + "£"+ p.getPrice());
//set value into imageview according to position
ImageView imgView = (ImageView) cell.findViewById(R.id.product_image);
// clear the image
imgView.setImageDrawable(null);
//and load from the network
p.loadImage(imgView, 54, 54);
return cell;
}
}
public static final Integer[] productIcons = {
0, // index 0 is empty
R.drawable.books,
R.drawable.films,
R.drawable.music,
R.drawable.games,
};
private int categoryId;
private ProductListAdapter adapter;
private ListViewLoader loader;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// get the category from the intent
Intent intent = getIntent();
categoryId = intent.getIntExtra(MainActivity.SELECTED_CATEGORY, 0);
adapter = new ProductListAdapter(this);
setListAdapter(adapter);
// Show the Up button in the action bar.
setupActionBar();
loader = new ListViewLoader(adapter, categoryId);
loader.execute(String.format(MainActivity.WEBSERVER_GETLIST, categoryId));
}
/**
* Set up the {#link android.app.ActionBar}.
*/
private void setupActionBar() {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.product_list, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.show_cart:
//create the intent for the cart activity
Intent intent = new Intent(getApplicationContext(), CartActivity.class);
startActivity(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
//create an intent
Intent intent = new Intent(this, ProductActivity.class);
Product p = (Product)adapter.getItem(position);
//specify the extra parameters we want to pass
intent.putExtra(MainActivity.SELECTED_CATEGORY, p.getCategoryId());
intent.putExtra(MainActivity.SELECTED_PRODUCTID, p.getProductId());
intent.putExtra(MainActivity.SELECTED_PRODUCTNAME, p.getProductName());
intent.putExtra(MainActivity.SELECTED_PRODUCTPRICE, p.getPrice());
intent.putExtra(MainActivity.SELECTED_SUITABLEFORKIDS, p.getSuitableForKids());
startActivity(intent);
}
}
EDIT:
XML for adapter_product_list
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="8dp">
<ImageView
android:id="#+id/product_image"
android:layout_width="54dp"
android:layout_height="54dp"
android:padding="5dp"
android:layout_alignParentLeft="true" />
<TextView
android:id="#+id/product_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_image"
android:layout_alignTop="#+id/product_image"
android:textColor="#446688"
android:textSize="20sp" />
<TextView
android:id="#+id/product_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_image"
android:layout_below="#+id/product_title"
android:textColor="#777777"
android:textSize="16sp"
android:textStyle="italic" />
</RelativeLayout>

Change your xml like following
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="8dp" >
<ImageView
android:id="#+id/product_image"
android:layout_width="54dp"
android:layout_height="54dp"
android:layout_alignParentLeft="true"
android:padding="5dp"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/product_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/product_image"
android:layout_toRightOf="#+id/product_image"
android:text="adjkajdjk"
android:textColor="#446688"
android:textSize="20sp" />
<TextView
android:id="#+id/product_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/product_title"
android:layout_toRightOf="#+id/product_image"
android:text="adjkajdjk"
android:textColor="#777777"
android:textSize="16sp"
android:textStyle="italic" />
<Button
android:id="#+id/delete_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="Delete" />
</RelativeLayout>
And in your adapter inside getView() function add this
Button deleteBtn = (Button) findViewById(R.id.delete_btn);
deleteBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v)
{
itemList.remove(position);
notifyDataSetChanged();
}
});

1) hope p.loadImage(imgView, 54, 54); is running in a asyncTask
2) if you want to click on a button in a row of a ListView than you shoudl add the button to your row layout and implent onClickListenr of that button in your getView method of adapter.in onClick method yous hould have:
if(position<itemList.size()){
//TO REMOVE TEM FROM ARRAY LIST
itemList.remove(position);
//TO Update the ListView
notifyDataSetChanged();
}
you can implement a multy line delete,by adding a checkbox in your listRow and adding the positon of the item to be deleted to an arrayList of Integers and after click-ing the delete button you should delete all the items from the imteList and after that call notifyDataSetChanged()
EDIT
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="8dp">
<ImageView
android:id="#+id/product_image"
android:layout_width="54dp"
android:layout_height="54dp"
android:padding="5dp"
android:layout_alignParentLeft="true" />
<TextView
android:id="#+id/product_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_image"
android:layout_alignTop="#+id/product_image"
android:textColor="#446688"
android:textSize="20sp" />
<TextView
android:id="#+id/product_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_image"
android:layout_below="#+id/product_title"
android:textColor="#777777"
android:textSize="16sp"
android:textStyle="italic" />
<Button
android:id="#+id/deleteBtn"
android:layout_width="wrap_content
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_info"
</RelativeLayout>
you should add this button to your layout, and in getView method of adapter add
Button delete=v.findViewById(R.id.deleteBtn);
delete.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
//THE PART I WROTE ABOVE
}
})

Android checkBox onClick app doesn't work, stops unexpectedly?

So,
I am building a basic app which has 2 activivities. Now, the first one works well, the second one does not. It does not show any errors while I edit the codes, but when I run the app and when I am in the second acitivity it gives me an annoying error. Saying "Stops unexpectedly...." You know. I tried debugging but failed. In the second activity called Troll.java I should be able to check a checkbox and when I do that a text is supposed to change to something else. It says stops unexpe.....
main.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:padding="0dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<include
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
layout="#layout/resuable_pizza_layout" />
<TextView
android:id="#+id/display"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="105dp"
android:text="#string/display"
android:textColor="#FFFFFF"
android:textSize="18sp" />
<ImageView
android:id="#+id/lol"
android:onClick="onlol"
android:contentDescription="#string/lol2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/display"
android:layout_centerHorizontal="true"
android:layout_marginTop="66dp"
android:src="#drawable/lol" />
troll.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF69B4"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center" >
<CheckBox
android:id="#+id/box1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onChecked1"
android:text="#string/ch1"
android:textColor="#000000" />
<CheckBox
android:id="#+id/box2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onChecked2"
android:text="#string/ch2"
android:textColor="#000000" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:gravity="center"
android:layout_weight="0.26" >
<TextView
android:id="#+id/textView1"
android:textColor="#000000"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/trollFace"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
</LinearLayout>
mainActitvity.java :
package com.example.pizza2;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;
public class MainActivity extends Activity {
CheckBox pepp, cheese;
TextView tv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pepp = (CheckBox) findViewById(R.id.check1);
cheese = (CheckBox) findViewById(R.id.check2);
tv = (TextView) findViewById(R.id.display);
}
public void onShow(View view){
StringBuilder str = new StringBuilder();
if (pepp.isChecked() && cheese.isChecked()){
str.append("Pepperoni, extra cheese pizza!");
}
else if (pepp.isChecked()){
str.append("Pepperoni pizza!");
}
else if (cheese.isChecked()){
str.append("Extra cheese pizza!");
}
tv.setText(str);
}
public void onlol(View view){
Intent intent = new Intent(this, Troll.class);
startActivity(intent);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Troll.java:
package com.example.pizza2;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;
public class Troll extends Activity{
CheckBox box11, box22;
TextView tv;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.troll);
box11 = (CheckBox) findViewById(R.id.box1);
box22 = (CheckBox) findViewById(R.id.box2);
tv = (TextView) findViewById(R.id.display);
}
public void onChecked1(View view){
StringBuilder str = new StringBuilder();
if(box11.isChecked()){
str.append("Lol bro!");
}
tv.setText(str);
}//end of "onChecked1"
public void onChecked2(View view){
StringBuilder str = new StringBuilder();
if(box22.isChecked()){
str.append("XD XD Kaki");
}
tv.setText(str);
} //end of "onChecked2"
}

App crashing due to FindViewById(), issue with componentInfo

So whenever the these two lines are commented out its fine, but with them it crashes.
EditText convertValue = (EditText) findViewById(R.id.et_value_convert);
TextView convertResult = (TextView) findViewById(R.id.txt_result);
here's my full class code, xml is below.
package com.doubleelite.maxtest;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class ConverterActivity extends Activity {
EditText convertValue = (EditText) findViewById(R.id.et_value_convert);
TextView convertResult = (TextView) findViewById(R.id.txt_result);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_converter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_converter, menu);
return true;
}
// Custom method to handle button clicks.
public void onClick(View v) {
switch(v.getId()) {
case R.id.btn_to_cel:
convertResult.setText(String.valueOf(convertFahrenheitToCelsius(Integer.valueOf(convertValue.getText().toString()))));
}
}
private float convertFahrenheitToCelsius(float f) {
return (f-32) * (5/9);
}
private float convertCelsiusToFahrenheit(float c) {
return c * (9/5) + 32;
}
}
here is the xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".ConverterActivity" >
<EditText
android:id="#+id/et_value_convert"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/text_value_convert"
android:inputType="number"
/>
<Button
android:id="#+id/btn_to_cel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/button_celsius"
android:onClick="onClick"
/>
<Button
android:id="#+id/btn_to_fahr"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/button_fahr"
android:onClick="onClick"
/>
<TextView
android:id="#+id/txt_result"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium"
tools:ignore="HardcodedText" />
</LinearLayout>

Currently you are trying to find view's before setting layout for Activity.change your code as :
public class ConverterActivity extends Activity {
EditText convertValue ;
TextView convertResult;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_converter);
convertValue = (EditText) findViewById(R.id.et_value_convert);
convertResult = (TextView) findViewById(R.id.txt_result);
}
///YOUR CODE HERE

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Can't get textview to display user output on android - java

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