删除并添加视图NPE,蜂窝,android

Question

我已经以LinearLayout areaForGalleries编程方式Gallery一个接一个地填充了组件.onItemClick每个库中的方法将其从中移除areaForGalleries并将其添加到RelativeLayout parentLayout其中areaForGalleries.见下面的代码.

LinearLayout areaForGalleries;
RelativeLayout parentLayout;

...
private void showGallery() {
final CustomGallery mGallery = new CustomGallery(mContext);

mGallery.setOnItemClickListener(new CustomAdapterView.OnItemClickListener() {
        public void onItemClick(CustomAdapterView<?> parent, View v, int position, long id) {
            areaForGalleries.removeView(mGallery);
            parentLayout.addView(mGallery);
        }
    });

CustomGallery是我的Android Gallery组件实现.我只更改了左侧图库的对齐方式 - 一行代码已更改.代码在Android 2.1 - 2.3.3上完美运行,但是当在Honeycomb或ICS上尝试时,它崩溃并出现以下错误:

01-31 10:31:49.596: E/AndroidRuntime(1536): FATAL EXCEPTION: main
01-31 10:31:49.596: E/AndroidRuntime(1536): java.lang.NullPointerException
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.GestureDetector.onTouchEvent(GestureDetector.java:587)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at com.my.example.pullrefreshgallery.CustomGallery.onTouchEvent(CustomGallery.java:812)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.View.dispatchTouchEvent(View.java:5486)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1953)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1714)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1892)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1371)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.app.Activity.dispatchTouchEvent(Activity.java:2364)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at com.my.example.Home.dispatchTouchEvent(Home.java:883)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1840)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.View.dispatchPointerEvent(View.java:5662)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:2863)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.os.Looper.loop(Looper.java:137)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at android.app.ActivityThread.main(ActivityThread.java:4340)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at java.lang.reflect.Method.invokeNative(Native Method)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at java.lang.reflect.Method.invoke(Method.java:511)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-31 10:31:49.596: E/AndroidRuntime(1536):     at dalvik.system.NativeStart.main(Native Method)

NullPointerException是指CustomGallery方法,我根本没有改变:

@Override
public boolean onTouchEvent(MotionEvent event) {

    // Give everything to the gesture detector
    boolean retValue = mGestureDetector.onTouchEvent(event);

    int action = event.getAction();
    if (action == MotionEvent.ACTION_UP) {
        // Helper method for lifted finger
        onUp();
    } else if (action == MotionEvent.ACTION_CANCEL) {
        onCancel();
    }

    return retValue;

}

当我注释掉删除的行并添加mGallery一切完美!有类似的问题,但我没有使用碎片.

有什么想法有什么不对？谢谢!

Answer 1

我现在不是你等待的答案,但我只是在原始Gallery小部件上的ICS上遇到了同样的问题(没有超载).

经过一些测试后,我最终使用了简单的方法:尝试...捕获

@Override
public boolean onTouchEvent(MotionEvent event) {
    try {
        return super.onTouchEvent(event);
    } catch (Throwable t) {
        return true;
    }
}

厨房仍然正常工作,onClickListener也是如此,所以对我没有任何副作用.