2

为什么我在下面的代码中从 Eclipse 得到错误？

代码：

public class ServiceKeyboard extends InputMethodService implements KeyboardView.OnKeyboardActionListener
 {
   public  static ProgressDialog progressDialog;

...
   @Override public void onStartInput( EditorInfo attribute, boolean restarting)
    {
      super.onStartInput( attribute, restarting);
      progressDialog = new ProgressDialog( ServiceKeyboard.this);
      progressDialog.setMessage( getString( R.string.sSpinner));
// after this line crash
      progressDialog.show();
...
...
      if( progressDialog != null)  progressDialog.dismiss();
    }
 }

错误：

11-23 12:53:07.854: E/AndroidRuntime(23963): FATAL EXCEPTION: main
11-23 12:53:07.854: E/AndroidRuntime(23963): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.view.ViewRootImpl.setView(ViewRootImpl.java:589)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:326)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.app.Dialog.show(Dialog.java:277)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at com.avanpost.mobile.ServiceKeyboard.onStartInput(ServiceKeyboard.java:354)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.inputmethodservice.InputMethodService.doStartInput(InputMethodService.java:1549)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.inputmethodservice.InputMethodService$InputMethodImpl.startInput(InputMethodService.java:388)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.inputmethodservice.IInputMethodWrapper.executeMessage(IInputMethodWrapper.java:158)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.os.Handler.dispatchMessage(Handler.java:99)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.os.Looper.loop(Looper.java:137)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at android.app.ActivityThread.main(ActivityThread.java:4745)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at java.lang.reflect.Method.invokeNative(Native Method)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at java.lang.reflect.Method.invoke(Method.java:511)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-23 12:53:07.854: E/AndroidRuntime(23963):    at dalvik.system.NativeStart.main(Native Method)

softKeyboard（InputMethodService）启动时使用progressDialog打开窗口的最佳解决方案是什么？

我尝试“new ProgressDialog(this);”、“new ProgressDialog(getApplicationContext());” 而是“new ProgressDialog（ServiceKeyboard.this）;”，但失败了。

4

2 回答 2

1

在创建没有关联 Activity 的 InputMethodService 时，我遇到了类似的问题。

这仅适用于 API 版本 12 及更高版本，但我设法通过传入输入视图使用的窗口令牌来显示 ProgressDialog。只要发生这种情况，就可以使用应用程序上下文构造 ProgressDialog。

这需要 API 版本 12 的原因是 InputMethodService 必须实现 OnAttachStateChangeListener 以便在输入视图附加到窗口时得到通知；尝试更早地执行该代码会导致 null 令牌。很可能在生命周期的后期有另一个地方可以放置令牌请求，但是由于我的 IME 已经有这些 API 要求，所以我没有费心去寻找。

编码：

public class SampleKeyboardService extends InputMethodService
                                   implements OnAttachStateChangeListener {
  private View mInputView;
  private ProgressDialog mProgress;

  @Override
  public View onCreateInputView() {
      super.onCreateInputView();
      LayoutInflater inflater =
          (LayoutInflater) getSystemService(Service.LAYOUT_INFLATER_SERVICE);
      mInputView = inflater.inflate(R.layout.input, null);
      mInputView.addOnAttachStateChangeListener(this);
      return mInputView;
  }

  /* ... */

  @Override
  public void onViewAttachedToWindow(View view) {
      Window progressWindow = mProgress.getWindow(); // mProgress created earlier
      WindowManager.LayoutParams layoutParams = progressWindow.getAttributes();
      layoutParams.token = view.getWindowToken();
      layoutParams.type = 
          WindowManager.LayoutParams.TYPE_APPLICATION_ATTACHED_DIALOG;
      progressWindow.setAttributes(layoutParams);
  }
}

另请参阅https://stackoverflow.com/a/13962770/793212

于 2013-09-24T22:29:19.303 回答
0

尝试从 Activity 调用 ProgressDialog。它将解决您的问题。给我更多解释你想要做什么。

于 2012-11-23T13:23:14.713 回答