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POAlert Dialog Positive Button Issue
 

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  1. POAlert Dialog Positive Button Issue
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    <p>I have alert dialog initiated on button click , it had username and password , after alert dialog fired , if you press OK button , it force close and close the app ,</p> <p>any help will be appreciated. </p> <pre><code> public class MainActivity extends Activity { final Context context = this; private Button button; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TextView tv=(TextView)findViewById(R.id.introclusion_tv1); tv.setTypeface(FontFactory.getBFantezy(getBaseContext())); TextView tv1=(TextView)findViewById(R.id.introclusion_tv2); tv1.setTypeface(FontFactory.getBFantezy(getBaseContext())); tv1.setText(Html.fromHtml(getString(R.string.introclusion))); button = (Button) findViewById(R.id.button1); // add button listener button.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { LayoutInflater li = LayoutInflater.from(context); View dialog_layoutView = li.inflate(R.layout.dialog_layout, null); AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context); alertDialogBuilder.setView(dialog_layoutView); alertDialogBuilder .setCancelable(false) .setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog,int id) { EditText username = (EditText) findViewById(R.id.txt_name); EditText password = (EditText) findViewById(R.id.password); if(username.getText().toString().length() &gt; 0 &amp;&amp; password.getText().toString().length() &gt; 0 ) { if(username.getText().toString().equals("test") &amp;&amp; password.getText().toString().equals("test")) { Intent intent = new Intent(MainActivity.this,Text.class); startActivity(intent); finish();} else{ // get your custom_toast.xml layout LayoutInflater inflater = getLayoutInflater(); View layout = inflater.inflate(R.layout.custom_toast, (ViewGroup) findViewById(R.id.custom_toast)); // set a dummy image ImageView image = (ImageView) layout.findViewById(R.id.image_toast); image.setImageResource(R.drawable.ic_launcher); // set a message TextView text = (TextView) layout.findViewById(R.id.text_toast); text.setText("Wrong username or password"); // Toast... Toast toast = new Toast(getApplicationContext()); toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0); toast.setDuration(Toast.LENGTH_LONG); toast.setView(layout); toast.show();}}} }) .setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); // create alert dialog AlertDialog alertDialog = alertDialogBuilder.create(); // show it alertDialog.show(); } }); } } </code></pre> <p>LOGCAT:</p> <pre><code> java.lang.NullPointerException at com.example.demo.MainActivity$1$1.onClick(MainActivity.java:63) at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:163) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:130) at android.app.ActivityThread.main(ActivityThread.java:3687) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>dialog_layout.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="10sp" &gt; &lt;EditText android:id="@+id/txt_name" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="@string/dialog_uname" android:singleLine="true" &gt; &lt;requestFocus /&gt; &lt;/EditText&gt; &lt;EditText android:id="@+id/password" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:inputType="textPassword" &gt; &lt;/EditText&gt; </code></pre> <p></p>
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    1. COPossible username or password vars are null? Maybe instance on OnCreate
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