Question

AlertDialog.Builder builder;
    AlertDialog alertDialog;

    Context mContext = getApplicationContext();
    LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE);
    View layout = inflater.inflate(R.layout.dialoglayout,
                                   (ViewGroup) findViewById(R.id.layout_root));

    TextView text = (TextView) layout.findViewById(R.id.text);
    text.setText("Hello, this is a custom dialog!");
    ImageView image = (ImageView) layout.findViewById(R.id.image);
    image.setImageResource(R.drawable.icon);

    builder = new AlertDialog.Builder(mContext);
    builder.setView(layout);
    alertDialog = builder.create();

    alertDialog.show();

Can anyone tell me the problem with this code .It gives the below exception:

11-06 11:44:20.572: ERROR/AndroidRuntime(339): FATAL EXCEPTION: main
11-06 11:44:20.572: ERROR/AndroidRuntime(339): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.andoroid.dialog/com.andoroid.dialog.AlertDialogTestActivity}: android.view.WindowManager$BadTokenException: Unable to add window — token null is not for an application
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.os.Handler.dispatchMessage(Handler.java:99)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.os.Looper.loop(Looper.java:123)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.app.ActivityThread.main(ActivityThread.java:4627)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at java.lang.reflect.Method.invokeNative(Native Method)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at java.lang.reflect.Method.invoke(Method.java:521)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at dalvik.system.NativeStart.main(Native Method)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): Caused by: android.view.WindowManager$BadTokenException: Unable to add window — token null is not for an application
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.view.ViewRoot.setView(ViewRoot.java:509)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.app.Dialog.show(Dialog.java:241)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at com.andoroid.dialog.AlertDialogTestActivity.createDialog(AlertDialogTestActivity.java:48)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at com.andoroid.dialog.AlertDialogTestActivity.onCreate(AlertDialogTestActivity.java:22)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-06 11:44:20.572: ERROR/AndroidRuntime(339): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

Answer 1

My idea:

1) use current activity instead of mContext = getApplicationContext(); for example:

LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);

this refers to your activity if you are writing code in it.

2) clear your project