# Android自助餐之點擊事件傳遞
源碼（含圖）[下載](http://download.csdn.net/detail/xmh19936688/9372620)
### 看圖分析
圖中的Out是ViewGroup的一個子類，如RelativeLayout等。看完圖基本就不用分析了
### 來點代碼
先看layout。MyRelativeLayout只是繼承RelativeLayout并重寫`dispatchTouchEvent`、`onTouchEvent`、`onInterceptTouchEvent`三個方法。MyView也只是重寫了`dispatchTouchEvent`、`onTouchEvent`兩個方法。
~~~
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activity.MainActivity">
<com.xmh.toucheventdemo.view.MyRelativeLayout
android:id="@+id/out"
android:tag="out"
android:layout_width="300dp"
android:layout_height="400dp"
android:layout_centerInParent="true"
android:background="@color/colorAccent"
>
<com.xmh.toucheventdemo.view.MyView
android:id="@+id/view"
android:tag="view"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_centerInParent="true"
android:background="#ffffff"
/>
</com.xmh.toucheventdemo.view.MyRelativeLayout>
</RelativeLayout>
~~~
父控件MyRelativeLayout.java。個人習慣重寫View時重寫三個構造方法。
~~~
public class MyRelativeLayout extends RelativeLayout{
public MyRelativeLayout(Context context) {
super(context);
}
public MyRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
Log.e("xmh", getTag()+"-dispatch:" + TouchEventUtil.getTouchActionName(event));
return super.dispatchTouchEvent(event);
// return true;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
Log.e("xmh", getTag()+"-touch:" + TouchEventUtil.getTouchActionName(event));
return super.onTouchEvent(event);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
Log.e("xmh", getTag()+"-intercept:" + TouchEventUtil.getTouchActionName(event));
return super.onInterceptTouchEvent(event);
// return true;
}
}
~~~
子控件MyView.java。MyView跟MyRelativeLayout大同小異，但還是把代碼貼上吧。
~~~
public class MyView extends View{
public MyView(Context context) {
super(context);
}
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
Log.e("xmh", getTag() + "-dispatch:" + TouchEventUtil.getTouchActionName(event));
return super.dispatchTouchEvent(event);
// return true;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
Log.e("xmh", getTag() + "-touch:" + TouchEventUtil.getTouchActionName(event));
return super.onTouchEvent(event);
// return true;
}
}
~~~
上面代碼中的TouchEventUtil是方便打Log的，看代碼就明白了。
~~~
public class TouchEventUtil {
public static String getTouchActionName(MotionEvent event) {
int actionId=event.getAction();
String actionName = "Unknow:id=" + actionId;
switch (actionId) {
case MotionEvent.ACTION_DOWN:
actionName = "ACTION_DOWN";
break;
case MotionEvent.ACTION_MOVE:
actionName = "ACTION_MOVE";
break;
case MotionEvent.ACTION_UP:
actionName = "ACTION_UP";
break;
case MotionEvent.ACTION_CANCEL:
actionName = "ACTION_CANCEL";
break;
case MotionEvent.ACTION_OUTSIDE:
actionName = "ACTION_OUTSIDE";
break;
}
return actionName;
}
}
~~~
最后是MainActivity.java
~~~
public class MainActivity extends AppCompatActivity {
@Bind(R.id.out)RelativeLayout rlOut;
@Bind(R.id.view)View vUp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
Log.e("xmh","activity-dispatch:"+ TouchEventUtil.getTouchActionName(event));
return super.dispatchTouchEvent(event);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
Log.e("xmh","activity-touch:"+ TouchEventUtil.getTouchActionName(event));
return super.onTouchEvent(event);
}
}
~~~
