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本文例子參考：陳育 Android View 事件分發機制源碼詳解(View篇)

1. activity

public class DispatchActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dispatch);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action = event.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                Log.d("aaa", "activity onTouchEvent down");
                break;
            case MotionEvent.ACTION_MOVE:
                Log.d("aaa", "activity onTouchEvent move");
                break;
            case MotionEvent.ACTION_UP:
                Log.d("aaa", "activity onTouchEvent up");
                break;
        }
        boolean result = super.onTouchEvent(event);
        Log.d("aaa", "activity onTouchEvent result = " + result);
        return result;
    }
}

2. 布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <qingfengmy.developmentofart._3view.ViewGroupA
        android:id="@+id/viewgroupa"
        android:layout_width="400dp"
        android:layout_height="400dp"
        android:gravity="center"
        android:background="#2e8abb">
        <qingfengmy.developmentofart._3view.ViewA
            android:id="@+id/viewa"
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:background="#ed132e"/>
    </qingfengmy.developmentofart._3view.ViewGroupA>
</RelativeLayout>

3. ViewGroup

public class ViewGroupA extends LinearLayout {

    public ViewGroupA(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action = event.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                Log.d("aaa", "ViewGroupA onTouchEvent down");
                break;
            case MotionEvent.ACTION_MOVE:
                Log.d("aaa", "ViewGroupA onTouchEvent move");
                break;
            case MotionEvent.ACTION_UP:
                Log.d("aaa", "ViewGroupA onTouchEvent up");
                break;
        }
        boolean result = super.onTouchEvent(event);
        Log.d("aaa", "ViewGroup onTouchEvent result = " + result);
        return result;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                Log.d("aaa", "ViewGroupA dispatchTouchEvent down");
                break;
            case MotionEvent.ACTION_MOVE:
                Log.d("aaa", "ViewGroupA dispatchTouchEvent move");
                break;
            case MotionEvent.ACTION_UP:
                Log.d("aaa", "ViewGroupA dispatchTouchEvent up");
                break;
        }
        return super.dispatchTouchEvent(ev);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                Log.d("aaa", "ViewGroupA onInterceptTouchEvent down");
                break;
            case MotionEvent.ACTION_MOVE:
                Log.d("aaa", "ViewGroupA onInterceptTouchEvent move");
                break;
            case MotionEvent.ACTION_UP:
                Log.d("aaa", "ViewGroupA onInterceptTouchEvent up");
                break;
        }
        return super.onInterceptTouchEvent(ev);
    }
}

4. View

public class ViewA extends View {
    
    public ViewA(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
                Log.d("aaa","ViewA onTouchEvent down");
                break;
            case MotionEvent.ACTION_MOVE:
                Log.d("aaa","ViewA onTouchEvent move");
                break;
            case MotionEvent.ACTION_UP:
                Log.d("aaa","ViewA onTouchEvent up");
                break;
        }
        boolean result = super.onTouchEvent(event);
        Log.d("aaa","ViewA onTouchEvent result="+result);
        return result;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
                Log.d("aaa","ViewA dispatchTouchEvent down");
                break;
            case MotionEvent.ACTION_MOVE:
                Log.d("aaa","ViewA dispatchTouchEvent move");
                break; 
            case MotionEvent.ACTION_UP:
                Log.d("aaa","ViewA dispatchTouchEvent up");
                break;
        }
        return super.dispatchTouchEvent(event);
    }
}

5. 默認情況

所有事件都用super的方法，日志如下：

ViewGroupA dispatchTouchEvent down
ViewGroupA onInterceptTouchEvent down
ViewA dispatchTouchEvent down
ViewA onTouchEvent down
ViewA onTouchEvent result=false
ViewGroupA onTouchEvent down
ViewGroupA onTouchEvent result = false
activity onTouchEvent down
activity onTouchEvent result = false
activity onTouchEvent move
activity onTouchEvent result = false
activity onTouchEvent move
activity onTouchEvent result = false
activity onTouchEvent up
activity onTouchEvent result = false

可見，ViewGroupA分發事件->攔截事件(默認false)->ViewA分發事件->ViewA的OnTouchEvent方法(super返回false)->ViewGroupA的onTouchEvent(super返回false)->Activity的onTouchEvent。
后續的move和up事件都直接到Activity處。這里的邏輯應該在Activity的dispatchTouchEvent方法中實現。

6. 由于View默認的clickable屬性為false，這里改成true

<qingfengmy.developmentofart._3view.ViewA
    android:id="@+id/viewa"
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:clickable="true"
    android:background="#ed132e"/>

日志如下：

ViewGroupA dispatchTouchEvent down
ViewGroupA onInterceptTouchEvent down
ViewA dispatchTouchEvent down
ViewA onTouchEvent down
ViewA onTouchEvent result=true
ViewGroupA dispatchTouchEvent up
ViewGroupA onInterceptTouchEvent up
ViewA dispatchTouchEvent up
ViewA onTouchEvent up
ViewA onTouchEvent result=true

ViewA中onTouchEvent在Action為down時返回了true，則ViewGroup中是否攔截的第二個條件mFrstTouchTarge就有值，所以up時，還可以繼續判斷是否攔截。由于事件在ViewA中已經消耗，就不會傳到ViewGroup中。

7. ViewGroup攔截ACTION_DOWN事件：

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Log.d("aaa", "ViewGroupA onInterceptTouchEvent down");
            return true;
        case MotionEvent.ACTION_MOVE:
            Log.d("aaa", "ViewGroupA onInterceptTouchEvent move");
            break;
        case MotionEvent.ACTION_UP:
            Log.d("aaa", "ViewGroupA onInterceptTouchEvent up");
            break;
    }
    return super.onInterceptTouchEvent(ev);
}

日志如下：

ViewGroupA dispatchTouchEvent down
ViewGroupA onInterceptTouchEvent down
ViewGroupA onTouchEvent down
ViewGroupA onTouchEvent result = false
activity onTouchEvent down
activity onTouchEvent result = false
activity onTouchEvent up
activity onTouchEvent result = false

由于ViewGroupA在down時攔截了事件，則mFrstTouchTarge就沒有值，會調用他自己的onTouchEvent，由于他自己的onTouchEvent返回了false，就交給了Activity。盡管Activity的onTouchEvent也返回了false，后序的事件還是會交個他。

8. ViewGroup攔截ACTION_MOVE事件：

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Log.d("aaa", "ViewGroupA onInterceptTouchEvent down");
            break;
        case MotionEvent.ACTION_MOVE:
            Log.d("aaa", "ViewGroupA onInterceptTouchEvent move");
            return true;
        case MotionEvent.ACTION_UP:
            Log.d("aaa", "ViewGroupA onInterceptTouchEvent up");
            break;
    }
    return super.onInterceptTouchEvent(ev);
}

日志如下：

 ViewGroupA dispatchTouchEvent down
 ViewGroupA onInterceptTouchEvent down
 ViewA dispatchTouchEvent down
 ViewA onTouchEvent down
 ViewA onTouchEvent result=true
 ViewGroupA dispatchTouchEvent move
 ViewGroupA onInterceptTouchEvent move
 ViewA onTouchEvent result=true // *
 ViewGroupA dispatchTouchEvent move
 ViewGroupA onTouchEvent move
 ViewGroupA onTouchEvent result = false
 activity onTouchEvent move
 activity onTouchEvent result = false
 ViewGroupA dispatchTouchEvent up
 ViewGroupA onTouchEvent up
 ViewGroupA onTouchEvent result = false
 activity onTouchEvent up
 activity onTouchEvent result = false

除去號那一行，都很好理解。ViewGroupA分發事件，down的時候沒有攔截，則到ViewA中消耗掉。接著ViewGroup分發move事件，攔截move事件，處莫名處理。后序分發move事件，由于前一個已經攔截，第二個move直接到ViewGroupA的onTouchEvent處。由于他返回的false，所以最后由Activity處理。
那個*處到底是什么呢？debug進入程序，第一個move時：

if (mFirstTouchTarget == null) {
    handled = dispatchTransformedTouchEvent(ev, canceled, null,
            TouchTarget.ALL_POINTER_IDS);
} else {
    // 由于down時，ViewA已經消耗掉，這里mFirstTouchTarget有值，不為空，進入這里
    TouchTarget predecessor = null;
    TouchTarget target = mFirstTouchTarget;
    while (target != null) {
        final TouchTarget next = target.next;
        if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) {
            handled = true;
        } else {
            // 由于第二次攔截了，所以并沒有子View消耗move事件，進入這里
            final boolean cancelChild = resetCancelNextUpFlag(target.child)
                    || intercepted;
            // 下面這行代碼非常關鍵，因為此時cancelChild為true，這個會給子View傳一個cancle事件，在子View中把事件cancle掉。
            if (dispatchTransformedTouchEvent(ev, cancelChild,
                    target.child, target.pointerIdBits)) {
                handled = true;
            }
            if (cancelChild) {
                if (predecessor == null) {
                    // 注意這里，又把mFirstTouchTarget附成了null，所以第二個move不會攔截
                    mFirstTouchTarget = next;
                } else {
                    predecessor.next = next;
                }
                target.recycle();
                target = next;
                continue;
            }
        }
        predecessor = target;
        target = next;
    }
}

target的next是target鏈表中的，這里沒有next，所以為null.

// The next target in the target list.
public TouchTarget next;

再看dispatchTransformedTouchEvent方法，如下

private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel,
            View child, int desiredPointerIdBits) {
    final boolean handled;

    // 保留當前action
    final int oldAction = event.getAction();
    if (cancel || oldAction == MotionEvent.ACTION_CANCEL) {
        // 如果為cancle，則進來
        event.setAction(MotionEvent.ACTION_CANCEL);
        if (child == null) {
            handled = super.dispatchTouchEvent(event);
        } else {
            handled = child.dispatchTouchEvent(event);
        }
        event.setAction(oldAction);
        // 這里返回子View的處理結果
        return handled;
    }
    // 這里是不為cancle時的處理
    if (child == null) {
        handled = super.dispatchTouchEvent(transformedEvent);
    } else {
        final float offsetX = mScrollX - child.mLeft;
        final float offsetY = mScrollY - child.mTop;
        transformedEvent.offsetLocation(offsetX, offsetY);
        if (! child.hasIdentityMatrix()) {
            transformedEvent.transform(child.getInverseMatrix());
        }

        handled = child.dispatchTouchEvent(transformedEvent);
    }

}

可見當第一個move到來時，ViewGroupA的事件分發給了子ViewA，并將事件改成了cancle，由于ViewA是clickable為true，所以返回了true。這個事件在ViewA這里消耗掉了，也就沒有再到ViewGroupA里。ViewA修改如下：

@Override
public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()){
        case MotionEvent.ACTION_DOWN:
            Log.d("aaa","ViewA onTouchEvent down");
            break;
        case MotionEvent.ACTION_MOVE:
            Log.d("aaa","ViewA onTouchEvent move");
            break;
        case MotionEvent.ACTION_UP:
            Log.d("aaa","ViewA onTouchEvent up");
            break;
        case MotionEvent.ACTION_CANCEL:
            Log.d("aaa","ViewA onTouchEvent cancle");
            break;
    }
    boolean result = super.onTouchEvent(event);
    Log.d("aaa","ViewA onTouchEvent result="+result);
    return result;
}

日志如下：

 ViewGroupA dispatchTouchEvent down
 ViewGroupA onInterceptTouchEvent down
 ViewA dispatchTouchEvent down
 ViewA onTouchEvent down
 ViewA onTouchEvent result=true
 ViewGroupA dispatchTouchEvent move
 ViewGroupA onInterceptTouchEvent move
 ViewA onTouchEvent cancle // * 原*號處
 ViewA onTouchEvent result=true // *
 ViewGroupA dispatchTouchEvent move
 ViewGroupA onTouchEvent move
 ViewGroupA onTouchEvent result = false
 activity onTouchEvent move
 activity onTouchEvent result = false

這也說明了一個View攔截了事件后，后續的所有事件都交由這個View處理，并不會再次判斷是否需要攔截。

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3.4 View的事件分發機制(四)

3.4 View的事件分發機制(四)

1. activity

2. 布局文件

3. ViewGroup

4. View

5. 默認情況

6. 由于View默認的clickable屬性為false，這里改成true

7. ViewGroup攔截ACTION_DOWN事件：

8. ViewGroup攔截ACTION_MOVE事件：

推薦閱讀更多精彩內容

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美 国产 综合 欧美 视频

3.4 View的事件分發機制(四)

1. activity

2. 布局文件

3. ViewGroup

4. View

5. 默認情況

6. 由于View默認的clickable屬性為false，這里改成true

7. ViewGroup攔截ACTION_DOWN事件：

8. ViewGroup攔截ACTION_MOVE事件：

推薦閱讀更多精彩內容

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频