我有一个名为SpotOnView的视图，它是在Game_shooting_AB上扩展的。编码如下。
背景：
在SpotOnView中有一个倒计时计时器。时间到了，游戏结束了，会弹出一个对话框，询问用户是想退出还是想再次玩。
SpotOnView代码：
public class SpotOnView extends View
{
......
// constructs a new SpotOnView
public SpotOnView(Context context, RelativeLayout parentLayout)
{
super(context);
resources = context.getResources();
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
....
}
public void start_timer()
{
if (!timerHasStarted)
{
countDownTimer.start();
timerHasStarted = true;
}
else
{
countDownTimer.cancel();
timerHasStarted = false;
}
}
public class MyCountDownTimer extends CountDownTimer
{
public MyCountDownTimer(long startTime, long interval)
{
super(startTime, interval);
}
@Override
public void onFinish()
{
text.setText("Time's up!");
((Game_shooting_AB)getContext()).replay_dialog(); //LINE 181
}
@Override
public void onTick(long millisUntilFinished)
{
....
}
}
游戏_射击_AB代码：
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.game_shooting);
// create a new SpotOnView and add it to the RelativeLayout
RelativeLayout layout = (RelativeLayout) findViewById(R.id.relativeLayout);
view = new SpotOnView(this, layout); //EXTENDING HERE
layout.addView(view, 0); // add view to the layout
....
}
public void replay_dialog()
{
final Dialog dialog1 = new Dialog(Game_shooting_AB.this, android.R.style.Theme_Translucent_NoTitleBar);
WindowManager.LayoutParams lp = dialog1.getWindow().getAttributes();
lp.dimAmount = 0.7f;
dialog1.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
Window window = dialog1.getWindow();
window.setGravity(Gravity.CENTER);
dialog1.setContentView(R.layout.alert_dialog_replay_shooting);
dialog1.setCancelable(false);
dialog1.show(); //LINE 431
....
Logcat：
在上述代码中添加了必要的行号作为注释。
11-22 00:16:34.365: W/dalvikvm(1105): threadid=1: thread exiting with uncaught exception (group=0x41f342a0)
11-22 00:16:34.370: E/AndroidRuntime(1105): FATAL EXCEPTION: main
11-22 00:16:34.370: E/AndroidRuntime(1105): android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@43304558 is not valid; is your activity running?
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.view.ViewRootImpl.setView(ViewRootImpl.java:708)
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:346)
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149)
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.view.Window$LocalWindowManager.addView(Window.java:554)
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.app.Dialog.show(Dialog.java:277)
11-22 00:16:34.370: E/AndroidRuntime(1105): at com.app.abc.Game_shooting_AB.replay_dialog(Game_shooting_AB.java:431)
11-22 00:16:34.370: E/AndroidRuntime(1105): at com.app.abc.SpotOnView$MyCountDownTimer.onFinish(SpotOnView.java:181)
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.os.CountDownTimer$1.handleMessage(CountDownTimer.java:118)
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.os.Handler.dispatchMessage(Handler.java:99)
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.os.Looper.loop(Looper.java:137)
11-22 00:16:34.370: E/AndroidRuntime(1105): at android.app.ActivityThread.main(ActivityThread.java:4898)
11-22 00:16:34.370: E/AndroidRuntime(1105): at java.lang.reflect.Method.invokeNative(Native Method)
11-22 00:16:34.370: E/AndroidRuntime(1105): at java.lang.reflect.Method.invoke(Method.java:511)
11-22 00:16:34.370: E/AndroidRuntime(1105): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
11-22 00:16:34.370: E/AndroidRuntime(1105): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
11-22 00:16:34.370: E/AndroidRuntime(1105): at dalvik.system.NativeStart.main(Native Method)
问题：
logcat显示你的活动正在进行吗？
我知道对话框需要有一个显示的基础。但是如何修改代码呢？
是否可以在
SpotOnView中编码并显示对话框，而不是在Game_shooting_AB代码中写入？我试图通过将类MyCountDownTimer和方法replay_dialog移回Game_shooting_AB来修改代码，但仍然出现了相同的错误。我想问一下，MyCountDownTimer的OnFinish是否会使"活动"完成，从而使对话框无法找到要显示的基础？
非常感谢！！
问题始于"（（Game_shooting_AB）getContext（））.ready_dialog（）；"这行代码。
正如你在android文档中发现的那样，当你从视图内部调用getContext（）时，你会得到"视图的上下文"。现在你正在做的是将该上下文转换为Game_shooting_AB，这是不好的，因为这可能是也可能不是活动的上下文。看看罗曼·盖伊对此的回答。因此，android会告诉你"你的活动正在运行吗？"。
现在，为了解决当前的问题，您可以通过任何公共方法将活动实例传递到此视图，并将其存储在本地变量中。
像这样调整你的代码：
public class SpotOnView extends View
{
Game_shooting_AB mGame_shooting_AB;
public void setGame_shooting_AB(Game_shooting_AB mGame_shooting_AB){
this.mGame_shooting_AB = mGame_shooting_AB;
}
......
// constructs a new SpotOnView
public SpotOnView(Context context, RelativeLayout parentLayout)
{
super(context);
resources = context.getResources();
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
....
}
public void start_timer()
{
if (!timerHasStarted)
{
countDownTimer.start();
timerHasStarted = true;
}
else
{
countDownTimer.cancel();
timerHasStarted = false;
}
}
public class MyCountDownTimer extends CountDownTimer
{
public MyCountDownTimer(long startTime, long interval)
{
super(startTime, interval);
}
@Override
public void onFinish()
{
text.setText("Time's up!");
mGame_shooting_AB.replay_dialog(); //LINE 181
}
@Override
public void onTick(long millisUntilFinished)
{
....
}
}
获得SpotOnView实例后，设置活动：
view = new SpotOnView(this, layout); //EXTENDING HERE
layout.addView(view, 0); // add view to the layout
view.setGame_shooting_AB(Game_shooting_AB.this);
希望这能有所帮助。
在完成活动时，需要在Intent中使用setResult。然后需要在onActivityResult的父活动中处理此结果，然后显示对话框。