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我正在开发一个 android 应用程序,我正在使用 ViewPager 的 fakedrag 创建图像幻灯片。默认情况下,ontouch 被禁用。我想在触摸时停止拖动过程。我尝试了以下联系方式,

@Override
public boolean onTouch(View v, MotionEvent event) 
{


    if(_mViewPager.getId() == v.getId())
    {
        if(event.getAction() == MotionEvent.ACTION_DOWN)
        {
            _mViewPager.beginFakeDrag();
            _mViewPager.endFakeDrag();
        }
    }

    return false;
}

但是,上面的代码给出了一个强制关闭。请看下面的错误日志,

07-18 14:09:12.568: E/AndroidRuntime(17547): FATAL EXCEPTION: main
07-18 14:09:12.568: E/AndroidRuntime(17547): java.lang.IllegalStateException: No fake   drag in progress. Call beginFakeDrag first.
07-18 14:09:12.568: E/AndroidRuntime(17547):    at android.support.v4.view.ViewPager.fakeDragBy(ViewPager.java:2313)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at com.exmp.myapp.learn.alphabets.AlphaPager$3$1.run(AlphaPager.java:454)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at android.os.Handler.handleCallback(Handler.java:605)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at android.os.Looper.loop(Looper.java:137)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at android.app.ActivityThread.main(ActivityThread.java:4424)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at java.lang.reflect.Method.invokeNative(Native Method)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at java.lang.reflect.Method.invoke(Method.java:511)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-18 14:09:12.568: E/AndroidRuntime(17547):    at    dalvik.system.NativeStart.main(Native Method)

请帮忙。谢谢!

4

1 回答 1

2
if (!_mViewPager.isFakeDragging()) {
    _mViewPager.beginFakeDrag();
} else {
    _mViewPager.endFakeDrag();
}

我希望它有所帮助。

于 2016-01-28T10:52:46.127 回答