事件分发、拦截、消费(一)

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main.xml

<?xml version="1.0" encoding="utf-8"?>
<cn.sunzn.tevent.TouchEventFather xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#468AD7"
    android:gravity="center"
    android:orientation="vertical" >

    <cn.sunzn.tevent.TouchEventChilds
        android:id="@+id/childs"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_gravity="center"
        android:background="#E1110D"
        android:text="@string/hello" />

</cn.sunzn.tevent.TouchEventFather>

package cn.sunzn.tevent;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;

public class TouchEventActivity extends Activity {

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}

	public boolean dispatchTouchEvent(MotionEvent ev) {
		Log.e("sunzn", "TouchEventActivity | dispatchTouchEvent --> " + TouchEventUtil.getTouchAction(ev.getAction()));
		return super.dispatchTouchEvent(ev);
	}

	public boolean onTouchEvent(MotionEvent event) {
		Log.e("sunzn", "TouchEventActivity | onTouchEvent --> " + TouchEventUtil.getTouchAction(event.getAction()));
		return super.onTouchEvent(event);
	}

}

package cn.sunzn.tevent;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.LinearLayout;

public class TouchEventFather extends LinearLayout {

	public TouchEventFather(Context context) {
		super(context);
	}

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

	public boolean dispatchTouchEvent(MotionEvent ev) {
		Log.e("sunzn", "TouchEventFather | dispatchTouchEvent --> " + TouchEventUtil.getTouchAction(ev.getAction()));
		return false;
	}

	public boolean onInterceptTouchEvent(MotionEvent ev) {
		Log.e("sunzn", "TouchEventFather | onInterceptTouchEvent --> " + TouchEventUtil.getTouchAction(ev.getAction()));
		return super.onInterceptTouchEvent(ev);
	}

	public boolean onTouchEvent(MotionEvent ev) {
		Log.e("sunzn", "TouchEventFather | onTouchEvent --> " + TouchEventUtil.getTouchAction(ev.getAction()));
		return super.onTouchEvent(ev);
	}

}

package cn.sunzn.tevent;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.LinearLayout;

public class TouchEventChilds extends LinearLayout {

	public TouchEventChilds(Context context) {
		super(context);
	}

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

	public boolean dispatchTouchEvent(MotionEvent ev) {
		Log.e("sunzn", "TouchEventChilds | dispatchTouchEvent --> " + TouchEventUtil.getTouchAction(ev.getAction()));
		return super.dispatchTouchEvent(ev);
	}

	public boolean onInterceptTouchEvent(MotionEvent ev) {
		Log.e("sunzn", "TouchEventChilds | onInterceptTouchEvent --> " + TouchEventUtil.getTouchAction(ev.getAction()));
		return super.onInterceptTouchEvent(ev);
	}

	public boolean onTouchEvent(MotionEvent ev) {
		Log.e("sunzn", "TouchEventChilds | onTouchEvent --> " + TouchEventUtil.getTouchAction(ev.getAction()));
		return super.onTouchEvent(ev);
	}

}

package cn.sunzn.tevent;

import android.view.MotionEvent;

public class TouchEventUtil {
	
	public static String getTouchAction(int actionId) {
		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;
	}
	
}

    /**
     * 代码运行后，事件首先由 TouchEventActivity 的 dispatchTouchEvent 方法分发给
     * TouchEventFather 控件的dispatchTouchEvent，而该控件的 dispatchTouchEvent 返回
     * false，表示对获取到的事件停止向下传递，同时也不对该事件进行消费。由于 TouchEventFather 获取的事件直接来自
     * TouchEventActivity ，则会将事件返回给 TouchEventActivity 的 onTouchEvent 进行消费，最后直接由
     * TouchEventActivity 来响应手指移动和抬起事件。
     */

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事件分发、拦截、消费(一)

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原文地址：http://blog.csdn.net/u013210620/article/details/48055549