Android OnTouchEvent, onClick, onLongClick调用机制

在Android开发中，我们经常会对一个View设置onClick，onLongClick，onTouch事件，有时还会同时设置这三个事件，那么在同时设置这三个时候，执行顺序是什么样呢？

首先，官方文档上面对onLongClick()和onTouch()的描述如下：

onLongClick() - This returns a boolean to indicate whether you have consumed the event and it should not be carried further. That is, return true to indicate that you have handled the event and it should stop here; return false if you have not handled it and/or the event should continue to any other on-click listeners.

onTouch() - This returns a boolean to indicate whether your listener consumes this event. The important thing is that this event can have multiple actions that follow each other. So, if you return false when the down action event is received, you indicate that you have not consumed the event and are also not interested in subsequent actions from this event. Thus, you will not be called for any other actions within the event, such as a finger gesture, or the eventual up action event.

写个简单的测试程序：

package com.qwei.demo;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.View.OnTouchListener;
import android.widget.TextView;

public class MainActivity extends Activity 
{
    private final static String TAG = MainActivity.class.getName();
	private TextView clickMe,showLog;
    private String log;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        clickMe = (TextView) findViewById(R.id.click_me);
        showLog = (TextView) findViewById(R.id.show_log);

        clickMe.setOnLongClickListener(new OnLongClickListener() {  

			@Override
			public boolean onLongClick(View arg0) {
				// TODO Auto-generated method stub
				 Log.d("TAG", "onLongClick is called.............");  
	                log = log +"onLongClick is called.............\n";
	                showLog.setText(log);
				return false;
			}  
        }); 
        clickMe.setOnClickListener(new OnClickListener() {  
              
            @Override  
            public void onClick(View v) {   
                Log.d("TAG", "onClick is called.............");  
                log = log +"onClick is called.............\n";
                showLog.setText(log);
            }  
        }); 

        clickMe.setOnTouchListener(new OnTouchListener() {  
              
            @Override  
            public boolean onTouch(View arg0, MotionEvent arg1) {  
                //Log.d("TAG", "onTouch is called.............");  
                switch (arg1.getAction()) {  
                case MotionEvent.ACTION_DOWN:  
                    Log.d("TAG", "ACTION_DOWN.............");  
                    log = log +"oACTION_DOWN............\n";
                    showLog.setText(log);
                    break;  
                case MotionEvent.ACTION_MOVE:  
                    Log.d("TAG", "ACTION_MOVE.............");  
                    log = log +"ACTION_MOVE.............\n";
                    showLog.setText(log);
                    break;  
                case MotionEvent.ACTION_CANCEL:  
                    Log.d("TAG", "ACTION_CANCEL.............");  
                    log = log +"ACTION_CANCEL............\n";
                    showLog.setText(log);
                    break;  
                case MotionEvent.ACTION_UP:  
                    Log.d("TAG", "ACTION_UP.............");  
                    log = log +"ACTION_UP............\n";
                    showLog.setText(log);
                    break;  
                default:  
                    break;  
                }  
                return false;  
            }  
        });  
    }
}

<img src="http://img.blog.csdn.net/20150510163553660?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvaGVsbG8wMzcw/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" width="423" height="641" alt="" />

当onTouch返回true，长按view时，会调用onTouch，onLongClick和onClick都不会被调用，如下图：