TabHost MonkeyTest 死机有关问题 Uncaughthandler:thread main exiting due to uncaught ex

TabHost MonkeyTest 死机问题 Uncaughthandler:thread main exiting due to uncaught exce
做monkey测试时，总碰到一个死机的问题
2515:30:19.010E/AndroidRuntime(2878):Uncaughthandler:thread main exiting due to uncaught exception
09-2515:30:19.026E/AndroidRuntime(2878):java.lang.NullPointerException 09-2515:30:19.026E/AndroidRuntime(2878):atandroid.widget.TabHost.dispatchWindowFocusChanged(TabHost.java:295) 09-2515:30:19.026E/AndroidRuntime(2878):atandroid.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:661) 09-2515:30:19.026E/AndroidRuntime(2878):atandroid.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:661) 09-2515:30:19.026E/AndroidRuntime(2878):atandroid.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:661) 09-


可以看出是 TabHost.java 第295行，只在2.1和之前的版本报，找到2.1版本的代码看出
    @Override
    public void dispatchWindowFocusChanged(boolean hasFocus) {
        mCurrentView.dispatchWindowFocusChanged(hasFocus);//第295行
    }
原因找到了，mCurrentView 为空导致的。

在看后续Android版本这块的代码
    @Override
    public void dispatchWindowFocusChanged(boolean hasFocus) {
        if (mCurrentView != null){
            mCurrentView.dispatchWindowFocusChanged(hasFocus);
        }
    }
说明这个问题可能是系统BUG，在后续已经被修复了

那么只需要自定义一个TabHost类，替换掉应用中的TabHost 即可，就可以避免这种BUG在低版本机器上发生.
public class ESTabHost extends TabHost {

public ESTabHost(Context context) {
super(context);
}

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

    @Override
    public void dispatchWindowFocusChanged(boolean hasFocus) {
    try {
super.dispatchWindowFocusChanged(hasFocus);
} catch (Exception e) {
}
    }
}