删除并添加视图NPE,蜂窝,android

2019-08-26 15:27:06 阅读：242 来源： 互联网

标签：android-gallery android add nullpointerexception android-3-0-honeycomb

我有一个接一个地以编程方式填充Gallery组件的LinearLayout areaForGalleries.每个库中的onItemClick方法将其从areaForGalleries中删除,并将其添加到RelativeLayout parentLayout,它是areaForGalleries的父级.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是我对Android Gallery组件的实现.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;

}

当我评论删除和添加mGallery的行时,一切都很完美！
有similar problem,但我没有使用碎片.

有什么想法有什么不对？
谢谢！

解决方法:

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.

标签：android-gallery,android,add,nullpointerexception,android-3-0-honeycomb
来源： https://codeday.me/bug/20190826/1731168.html

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。

ICode9

删除并添加视图NPE,蜂窝,android