android - 为什么键盘滑动会使我的应用程序崩溃？

Question

如果我实际滑出 Moto Droid A855 上的键盘，它会使我的测试应用程序崩溃，堆栈跟踪粘贴在下面。我不明白为什么？

另外，如果我在没有键盘的情况下启动我的应用程序，我的应用程序会在启动时立即崩溃。

该应用程序包含一个 Activity ，其中包含一个 viewflipper 作为主视图布局。 viewflipper 包含两个线性布局...

堆栈跟踪:

06-10 21:10:17.652 E/AndroidRuntime( 3785): Uncaught handler: thread main exiting due to uncaught exception
06-10 21:10:17.668 E/AndroidRuntime( 3785): java.lang.IllegalArgumentException: Receiver not registered: android.widget.ViewFlipper$1@447af0b8
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.app.ActivityThread$PackageInfo.forgetReceiverDispatcher(ActivityThread.java:667)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.app.ApplicationContext.unregisterReceiver(ApplicationContext.java:747)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:321)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.widget.ViewFlipper.onDetachedFromWindow(ViewFlipper.java:104)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.View.dispatchDetachedFromWindow(View.java:5835)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1076)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1074)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1074)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1074)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.ViewRoot.dispatchDetachedFromWindow(ViewRoot.java:1570)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.ViewRoot.doDie(ViewRoot.java:2556)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.ViewRoot.die(ViewRoot.java:2526)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:218)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.view.Window$LocalWindowManager.removeViewImmediate(Window.java:436)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3498)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3599)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.app.ActivityThread.access$2300(ActivityThread.java:119)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1867)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.os.Looper.loop(Looper.java:123)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at android.app.ActivityThread.main(ActivityThread.java:4363)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at java.lang.reflect.Method.invokeNative(Native Method)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at java.lang.reflect.Method.invoke(Method.java:521)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
06-10 21:10:17.668 E/AndroidRuntime( 3785):     at dalvik.system.NativeStart.main(Native Method)
06-10 21:10:17.684 I/Process ( 1017): Sending signal. PID: 3785 SIG: 3

编辑:从主要 Activity 中添加了 XML 布局和相关 fragment 。

整个 XML 布局文件

<?xml version="1.0" encoding="utf-8"?>


<ViewFlipper
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/vFlipper"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

                <!--  Linear Layout 1: messages and overview.  -->
                <LinearLayout
                    android:orientation="vertical"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    >

                <TableRow android:id="@+id/TableRow01" android:layout_width="fill_parent" android:layout_height="wrap_content">
                <TextView
                        android:text="Connection info"
                        android:id="@+id/tvCon1"
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:background="#F0F0F0"
                        android:textColor="#FF0000"
                        />
                </TableRow>


                <ScrollView
                        android:id="@+id/ScrollView01"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent">

                                <TextView  
                                        android:id="@+id/tvMessages"
                                    android:layout_width="fill_parent"
                                    android:layout_height="fill_parent"
                                    android:text=""
                                    />

                </ScrollView>

        </LinearLayout>


        <!--  Linear Layout 2: settings -->
        <LinearLayout
                    android:orientation="vertical"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    >


                <TableRow
                        android:id="@+id/TableRow03"
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content">

                                <TextView
                                android:text="hello world"
                                android:id="@+id/asdfasdf2"
                                android:layout_width="fill_parent"
                                android:layout_height="wrap_content"
                                />
                </TableRow>                

        </LinearLayout>

</ViewFlipper>

主要 Activity 的代码 fragment :

/**
 * Attempt (not currently working) to work around this bug: http://code.google.com/p/android/issues/detail?id=6191
 * TODO: make it work.
 */
@Override
public void onDetachedFromWindow() {
        Log.d("Dash","OnDetachedFromWindow()");

        try {
        super.onDetachedFromWindow();
    }
    catch (Exception e) {
        ViewFlipper v = (ViewFlipper)findViewById(R.id.vFlipper);
        if (v != null) {
                Log.d("Dash","De-Bug hit. e=" + e.getMessage());
                v.stopFlipping();
        }
    }
}

Answer 1

要解决这个问题你必须

• 定义一个名为 MyViewFlipper 的新类，它会覆盖 ViewFlipper(见下文)
• 在您之前引用过 ViewFlipper
的任何地方引用该新类
• 如下所示定义您的类和布局:

名为 MyViewFlipper 的新类。包含以下内容:

package com.gtosoft.dash; // change this to match your own app. 

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.ViewFlipper;

public class MyViewFlipper extends ViewFlipper {

    public MyViewFlipper(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onDetachedFromWindow() {
        try{
            super.onDetachedFromWindow();
        }catch(Exception e) {
            Log.d("MyViewFlipper","Stopped a viewflipper crash");
            stopFlipping();
        }
    }
}

现在要使用这个“固定”版本的 ViewFlipper，您必须在 xml 布局中引用它。由于它基本上是一个“自定义 View ”，因此您必须完全限定 MyViewFlipper 的包路径，如下所示:

<com.gtosoft.dash.MyViewFlipper
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/vFlipper"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    (insert all the other old layout code here)

</com.gtosoft.dash.MyViewFlipper>

现在应用程序不再因键盘滑动事件或应用程序启动时已经滑出而崩溃。在日志中查找:

06-11 20:08:15.811 D/MyViewFlipper( 6106): Stopped a viewflipper crash

来源:http://code.google.com/p/android/issues/detail?id=6191