我是靠谱客的博主 快乐水壶,这篇文章主要介绍Android 处理图片放大缩小时报错java.lang.IllegalArgumentException: pointerIndex out of range pointerIndex=-1 ...,现在分享给大家,希望可以做个参考。

完整的错误信息:

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java.lang.IllegalArgumentException: pointerIndex out of range pointerIndex=-1 pointerCount=1 at android.view.MotionEvent.nativeGetAxisValue(Native Method) at android.view.MotionEvent.getX(MotionEvent.java:2057) at android.support.v4.view.MotionEventCompatEclair.getX(MotionEventCompatEclair.java:32) at android.support.v4.view.MotionEventCompat$EclairMotionEventVersionImpl.getX(MotionEventCompat.java:110) at android.support.v4.view.MotionEventCompat.getX(MotionEventCompat.java:462) at android.support.v4.view.ViewPager.onInterceptTouchEvent(ViewPager.java:1916) at com.zhuwentao.com.common.component.imageviewer.ImageOriginPager.onInterceptTouchEvent(ImageOriginPager.java:79) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2108) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2461) at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1777) at android.app.Activity.dispatchTouchEvent(Activity.java:2865) at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2422) at android.view.View.dispatchPointerEvent(View.java:9610) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4436) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4302) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3836) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3889) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3855) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3981) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3863) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4038) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3836) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3889) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3855) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3863) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3836) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6135) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6109) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6070) at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6251) at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:192) at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method) at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:181) at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:6209) at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:6282) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:884) at android.view.Choreographer.doCallbacks(Choreographer.java:696) at android.view.Choreographer.doFrame(Choreographer.java:625) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:870) at android.os.Handler.handleCallback(Handler.java:743) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:150) at android.app.ActivityThread.main(ActivityThread.java:5546) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)

错误原因

我这里的这个错误是在继承了ViewPager的类里面,重写的onInterceptTouchEvent方法里产生的,这个异常一旦产生程序就直接崩溃了

为什么pointerIndex的值为-1时就异常停止了呢,顺着源码找到了程序异常终止的地方

在父类的ViewPager中的onTouchEvent方法,处理触摸点移动的位置:

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case MotionEvent.ACTION_MOVE: if (!mIsBeingDragged) { final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId ); if (pointerIndex == -1 ) { // A child has consumed some touch events and put us into an inconsistent state. needsInvalidate = resetTouch(); break; } // 省略......
很明显的,当pointerIndex = -1的时候,直接break了,后面的代码都没有被执行到,所以后面的MotionEventCompat.getX等获取触摸点x的值都获取不到了,Android系统这样的处理方式并不友好啊

解决方法

对于这种Android系统级别的bug,最好还是try掉它吧,改动系统源码再编译实在是太麻烦了

在继承至ViewPager的类中,重写 onInterceptTouchEvent 方法,在里面捕获这个异常IllegalArgumentException

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public class ImageOriginPager extends ViewPager { public ImageOriginPager(Context context) { super (context); } public ImageOriginPager(Context context, AttributeSet attrs) { super (context, attrs); } @Override public boolean onTouchEvent(MotionEvent event) { try { super.onTouchEvent(event); } catch (IllegalArgumentException e) { Log.e( "ImageOriginPager-error" , "IllegalArgumentException 错误被活捉了!"); e.printStackTrace(); } return false; } @Override public boolean onInterceptTouchEvent(MotionEvent event) { try { super.onInterceptTouchEvent(event); } catch (IllegalArgumentException e) { Log.e( "ImageOriginPager-error" , "IllegalArgumentException 错误被活捉了!"); e.printStackTrace(); } return false ; } }
当然也可以在重写的onTouchEvent中也进行一次捕获,双重保护

直接使用ViewPager控件的同学,如果也报IllegalArgumentException错误,可以新建一个自定义的类继承ViewPager,按照上面方式来重写,使用的时候就使用自定义的那个类来替换掉ViewPager

最后

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