Activity 已泄露窗口 com.android.internal.policy.impl.PhoneWindow$DecorView@46368a28 最初添加到这里 [英] Activity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@46368a28 that was originally added here

问题描述

这个问题让我发疯.我错过了一些关于如何在活动中创建的新线程中处理长操作以及如何在长操作完成后修改视图组件(如文本等)的基本但非常重要的知识.

This problem drives me crazy. I miss some basic but very important knowledge about how to handle long operations in a new thread created within an activity and how to modify view components like text and such after the long operation's done.

让我首先向您展示我的代码中发生此问题的部分:

Let me first show you the part of my code where this problem happens:

mProgressDialog = ProgressDialog.show(mContext, "Tripplanner", "please wait...", true, false);
connectAndGetRoute();


private void connectAndGetRoute(){

    new Thread(){
        @Override
        public void run() {
            try {
            if(!connectTo9292ov()) return;// conncetto9292ov() connects to a website, parses the reasult into an arraylist. The arraylist contains route.

            } catch(UnknownHostException e){
                Toast.makeText(mContext, "failed to connect to server", Toast.LENGTH_LONG).show();
            }catch (ClientProtocolException e) {
               Toast.makeText(mContext, "failed to connect to server", Toast.LENGTH_LONG).show();                   
        } catch (IOException e) {
                Toast.makeText(mContext, "failed to connect to server", Toast.LENGTH_LONG).show();
            }

            handler.post(runConnection);
        }

    }.start();

    handler = new Handler();
    runConnection = new Runnable(){
        @Override
        public void run() {
            mProgressDialog.dismiss();
            showOnScreen();
        }   
    };
}

这是我得到的错误:

ERROR/WindowManager(8297): Activity mp.tripplanner.OvPlanner has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@46368a28 that was originally added here
ERROR/WindowManager(8297): android.view.WindowLeaked: Activity mp.tripplanner.OvPlanner has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@46368a28 that was originally added here
ERROR/WindowManager(8297): at android.view.ViewRoot.<init>(ViewRoot.java:251)
ERROR/WindowManager(8297): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
ERROR/WindowManager(8297): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
ERROR/WindowManager(8297): at android.view.Window$LocalWindowManager.addView(Window.java:424)
ERROR/WindowManager(8297): at android.app.Dialog.show(Dialog.java:241)
ERROR/WindowManager(8297): at android.app.ProgressDialog.show(ProgressDialog.java:107)
ERROR/WindowManager(8297): at android.app.ProgressDialog.show(ProgressDialog.java:95)
ERROR/WindowManager(8297): at mp.tripplanner.OvPlanner$3.onClick(OvPlanner.java:351)
ERROR/WindowManager(8297): at android.view.View.performClick(View.java:2408)
ERROR/WindowManager(8297): at android.view.View$PerformClick.run(View.java:8817)
ERROR/WindowManager(8297): at android.os.Handler.handleCallback(Handler.java:587)
ERROR/WindowManager(8297): at android.os.Handler.dispatchMessage(Handler.java:92)
ERROR/WindowManager(8297): at android.os.Looper.loop(Looper.java:144)
ERROR/WindowManager(8297): at android.app.ActivityThread.main(ActivityThread.java:4937)
ERROR/WindowManager(8297): at java.lang.reflect.Method.invokeNative(Native Method)
ERROR/WindowManager(8297): at java.lang.reflect.Method.invoke(Method.java:521)
ERROR/WindowManager(8297): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
ERROR/WindowManager(8297): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
ERROR/WindowManager(8297): at dalvik.system.NativeStart.main(Native Method)

但是在上面一条之前的日志中又写了一条错误信息，就是:

But another error message is written to the log before the above one, which is:

ERROR/AndroidRuntime(8297): FATAL EXCEPTION: Thread-9
ERROR/AndroidRuntime(8297): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
ERROR/AndroidRuntime(8297): at android.os.Handler.<init>(Handler.java:121)
ERROR/AndroidRuntime(8297): at android.widget.Toast.<init>(Toast.java:68)
ERROR/AndroidRuntime(8297): at android.widget.Toast.makeText(Toast.java:231)
ERROR/AndroidRuntime(8297): at mp.tripplanner.OvPlanner$4.run(OvPlanner.java:371)

感谢您的帮助.

推荐答案

您的 Handler 需要在您的 UI 线程中创建，以便它能够更新 UI.然后我会使用处理程序的 sendMessage 方法，而不是发布一个可运行的:

Your Handler needs to be created in your UI thread for it to be able to update the UI. I would then use the sendMessage method of the handler, rather than posting a runnable:

private static final int HANDLER_MESSAGE_ERROR = 0;
private static final int HANDLER_MESSAGE_COMPLETED = 1;
...
private void connectAndGetRoute(){
    new Thread(){
        @Override
        public void run() {
            try {
                if(!connectTo9292ov()) return;

            } catch(UnknownHostException e){
                sendMessage(HANDLER_MESSAGE_ERROR);
            } catch (ClientProtocolException e) {
                sendMessage(HANDLER_MESSAGE_ERROR);
            } catch (IOException e) {
                sendMessage(HANDLER_MESSAGE_ERROR);
            } finally {
                sendMessage(HANDLER_MESSAGE_COMPLETED);
            }
        }
        private void sendMessage(int what){
            Message msg = Message.obtain();
            msg.what = what;
            mHandler.sendMessage(msg);
        }
    }.start();

}
...
private Handler mHandler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        switch(msg.what){
        case HANDLER_MESSAGE_ERROR:
            Toast.makeText(mContext, "failed to connect to server", Toast.LENGTH_LONG).show();
            break;
        case HANDLER_MESSAGE_COMPLETED:
            mProgressDialog.dismiss();
            showOnScreen();
            break;
        default:
            Log.w("MyTag","Warning: message type ""+msg.what+"" not supported");
        }
    }
}

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