Question

当我运行我的代码时，我收到此错误：

  : E/InputEventReceiver(1363): Exception dispatching input event.

  : E/MessageQueue-JNI(1363): Exception in MessageQueue callback: handleReceiveCallback

  : D/dalvikvm(1363): GC_CONCURRENT freed 1898K, 30% free 4921K/6992K, paused 78ms+107ms, total 413ms

  : E/MessageQueue-JNI(1363):  android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for  an application

  : E/MessageQueue-JNI(1363):at  com.example.ikmantest2.MainActivity$6.onItemClick(MainActivity.java:269)

这是我得到错误的代码：

gallery.setOnItemClickListener(new OnItemClickListener(){

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            final Dialog dialog = new Dialog(getBaseContext());
            dialog.setContentView(R.layout.image_dialog_layout);


            // set the custom dialog components - text, image and button
            imageView=(ImageView)dialog.findViewById(R.id.bigger_image);
            imageView.setImageBitmap(exListAdapter.getImageByPosition(lastClickedGroup, arg2));
            pre=(ImageButton)dialog.findViewById(R.id.btn_pre);
            back=(ImageButton)dialog.findViewById(R.id.btn_back);
            next=(ImageButton)dialog.findViewById(R.id.btn_next); 

            // if button is clicked, close the custom dialog
            pre.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });
            back.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });
            next.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });

            /*this is line number 269 as in error code*/  dialog.show();
        }

    });

那我怎么能解决这个错误呢？

Answer 1

这样做

final Dialog dialog = new Dialog(MainActivity.this);

Answer 2

改变最终

Dialog dialog = new Dialog(getBaseContext());

到

final Dialog dialog = new Dialog(YourActivity.this);

Answer 3

当传递错误的上下文时会发生此错误，只需更改Dailog context to activity context。

使用：

final Dialog dialog = new Dialog（MainActivity.this）;

相反：

final Dialog dialog = new Dialog（getBaseContext（））;

Answer 4

final Dialog dialog = new Dialog（MainActivity.this）;

或

final Dialog dialog = new Dialog（getApplicationContext（））;

Answer 5

Dialog可以由Activity显示，而不是（直接）由Application显示（主要不是由Service提供），因此Dialog的构造函数需要Activity的Context而不是Application的Context。

如果您知道活动的名称，那么

final Dialog dialog = new Dialog(YOUR_ACTIVITY_NAME.this);

当然有效。

但是，如果您不想在代码中刻录活动名称，请使用以下代码段：

public class MainActivity extends Activity {
Context context; // for context of the application
Context acontext; // for context of the activity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    context = getApplicationContext(); // Don't use for Dialog
    acontext = this; // Use for Dialog
    setContentView(R.layout.activity_main);

    // Dialog block started
    final Dialog dialog = new Dialog(acontext);
    dialog.setContentView(R.layout.custom);
    dialog.setTitle("Title");
    Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK);
    // if button is clicked, close the custom dialog
    dialogButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog.dismiss();
        }
    });     
    dialog.show();
    // Dialog block ended
}}

显示自定义对话框android时WindowManager BadTokenException

5 个答案: