Create AlertDialog in Android_问答_开发者_运维开发者技术经验分享

I'm trying to create an Aler Dialog but when I click on button my application crash.Any idea what's happening and how can I fix that?

Here is the code :

    Button deactivate = (Button) findViewById(R.id.deactivate);
    deactivate.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            new AlertDialog.Builder( MyCollectionId.this )
            .setTitle( "Invalid selection" )
            .setMessage( "Drbr" )
            .setPositiveButton( "Confirm", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    Log.d("AlertDialog", "Positive");
                }
            })
            .setNegativeButton( "Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    Log.d("AlertDialog","Negative");
                }
            })
            .show();    

        }

    });

LogCat :

08-08 11:51:39.794: ERROR/AndroidRuntime(551): Uncaught handler: thread main exiting due to uncaught exception
08-08 11:51:39.824: ERROR/AndroidRuntime(551): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@44c1d9f0 is not valid; is your activity running?
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewRoot.setView(ViewRoot.java:468)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.Window$LocalWindowManager.addView(Window.java:424)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.Dialog.show(Dialog.java:239)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.AlertDialog$Builder.show(AlertDialog.java:802)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.stampii.stampii.mystampii.MyCollectionId$3.onClick(MyCollectionId.java:67)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.View.performClick(View.java:2364)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.View.onTouchEvent(View.java:4179)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.widget.TextView.onTouchEvent(TextView.java:6541)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.View.dispatchTouchEvent(View.java:3709)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.Vi开发者_如何转开发ewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.os.Looper.loop(Looper.java:123)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.ActivityThread.main(ActivityThread.java:4363)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at java.lang.reflect.Method.invokeNative(Native Method)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at java.lang.reflect.Method.invoke(Method.java:521)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at dalvik.system.NativeStart.main(Native Method)

Thanks in advance!

This line:

 new AlertDialog.Builder( MyCollectionId.this )

is setting the context for your dialog to attach to the activity.

You either need to use

 YourActivity.this

 new AlertDialog.Builder( YourActivity.this )

or set the context to a variable and use that:

 Context mContext;

 onCreate(){
   mContext = this;
 }

 yourOnClick{
   new AlertDialog.Builder( mContext )
 }

If this isn't your issue you need more 'context' around your question, where are you calling the dialog from what Activity are you in what is the state of Activity.

Try this.

AlertDialog.Builder builder1=new AlertDialog.Builder(MyAlertdialogActivity.this);
builder1.setMessage("Please Press Ok");
builder1.setNeutralButton("OK",new DialogInterface.OnClickListener() {
  @Override
  public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
  Toast.makeText(getApplicationContext(), "Ok is pressed", Toast.LENGTH_LONG).show();
  }
  });
builder1.show();

Do check my humble blog too if you find it useful..I've have discussed about AlertDialog in detail there: http://androiddesk.wordpress.com/2012/01/25/dialog/