Android 处理图片放大缩小时报错java.lang.IllegalArgumentException: pointerIndex out of range pointerIndex=-1 ...

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我是靠谱客的博主快乐水壶，最近开发中收集的这篇文章主要介绍Android 处理图片放大缩小时报错java.lang.IllegalArgumentException: pointerIndex out of range pointerIndex=-1 ...，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

完整的错误信息：

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：

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

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