touch、touchevent-事件总结

1.废话不多说，直接上代码，如下

package com.example.mygestrue;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {
    GestureDetector mDetector;
    TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDetector = new GestureDetector(this,new GestureDetector.OnGestureListener() {

            @Override
            public boolean onSingleTapUp(MotionEvent arg0) {
                // TODO Auto-generated method stub
                return false;
            }

            @Override
            public void onShowPress(MotionEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2,
                    float arg3) {
                // TODO Auto-generated method stub
                return false;
            }

            @Override
            public void onLongPress(MotionEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public boolean onFling(MotionEvent arg0, MotionEvent arg1, float arg2,
                    float arg3) {
                // TODO Auto-generated method stub
                return false;
            }

            @Override
            public boolean onDown(MotionEvent arg0) {
                // TODO Auto-generated method stub
                return false;
            }
        });
        tv = (TextView)findViewById(R.id.tv1);
        tv.setOnTouchListener(new View.OnTouchListener() {

            @Override
            public boolean onTouch(View arg0, MotionEvent arg1) {
                Log.e("123", "ontouch");
                // TODO Auto-generated method stub
                return false;
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        Log.e("123","ontouchevent");
        return super.onTouchEvent(event);
    };
}

从上面的代码我们可以了解两个知识点

1.onTouchEvent()事件，好像只能在控件中继承的时候写死

2.onTouch()事件，可以在代码中给控件注册监听事件

打印的log如下：

1）点击屏幕tv以外的地方

- ::14.665: E/(): ontouchevent
- ::14.689: E/(): ontouchevent
- ::14.706: E/(): ontouchevent
- ::14.723: E/(): ontouchevent
- ::14.740: E/(): ontouchevent
- ::14.758: E/(): ontouchevent
- ::14.774: E/(): ontouchevent
- ::14.791: E/(): ontouchevent
- ::14.809: E/(): ontouchevent
- ::14.826: E/(): ontouchevent
- ::14.843: E/(): ontouchevent
- ::14.860: E/(): ontouchevent
- ::14.877: E/(): ontouchevent

2）点击tv的时候

- ::18.290: E/(): ontouch
- ::18.291: E/(): ontouchevent
- ::18.320: E/(): ontouchevent
- ::18.340: E/(): ontouchevent
- ::18.354: E/(): ontouchevent

得出的结论是

onToucht()事件总是最早接获得监听，然后才是的监听事件onTouchEvent()

2.如果我们把onTouch() 的返回值设置为 true

- ::52.923: E/(): ontouch
- ::52.954: E/(): ontouch
- ::52.971: E/(): ontouch
- ::52.985: E/(): ontouch
- ::52.988: E/(): ontouch
- ::54.701: E/(): ontouch
- ::54.729: E/(): ontouch
- ::54.746: E/(): ontouch
- ::54.755: E/(): ontouch

这个我们可以得出的结论是

在onTouch->onTouchEvent()过程中，前一个（onTouch()）返回true，那么这个响应事件就不会在传递给下一个接收着(onTouchEvent()),返回false，就是继续传递

3.现在我们在继续看一下他们两个跟GestureDetector的关系

我们把onTouchEvent()的返回值更改如下

@Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        Log.e("123","ontouchevent");
    //    return super.onTouchEvent(event);
        return mDetector.onTouchEvent(event);
    };

注意一点，虽然GestureDetector监听事件里没有onTouchEvent()，但是它本身却是有这种方法的

打印的log如下

1)点击屏幕tv 外一点

- ::39.414: E/(): ontouchevent
- ::39.414: E/(): ondown
- ::39.443: E/(): ontouchevent
- ::39.447: E/(): ontouchevent
- ::39.447: E/(): onsingle
- ::49.245: E/(): ontouchevent
- ::49.246: E/(): ondown
- ::49.273: E/(): ontouchevent
- ::49.291: E/(): ontouchevent
- ::49.293: E/(): ontouchevent

传递顺序onTouchEvent()->GestureDetector.onDown()->GestureDetector.onsingle()

2）滑动屏幕tv外一点

- ::34.008: E/(): ontouchevent
- ::34.008: E/(): ondown
- ::34.056: E/(): ontouchevent
- ::34.071: E/(): ontouchevent
- ::34.088: E/(): ontouchevent
- ::34.089: E/(): onscroll
- ::34.106: E/(): ontouchevent
- ::34.106: E/(): onscroll
- ::34.124: E/(): ontouchevent
- ::34.124: E/(): onscroll
- ::34.140: E/(): ontouchevent
- ::34.140: E/(): onscroll
- ::34.157: E/(): ontouchevent
- ::34.157: E/(): onscroll
- ::34.174: E/(): ontouchevent
- ::34.174: E/(): onscroll
- ::34.192: E/(): ontouchevent
- ::34.192: E/(): onscroll
- ::34.208: E/(): ontouchevent
- ::34.209: E/(): onscroll
- ::34.226: E/(): ontouchevent
- ::34.226: E/(): onscroll
- ::34.243: E/(): ontouchevent
- ::34.243: E/(): onscroll
- ::34.260: E/(): ontouchevent
- ::34.260: E/(): onscroll
- ::34.277: E/(): ontouchevent
- ::34.278: E/(): onscroll
- ::34.294: E/(): ontouchevent
- ::34.294: E/(): onscroll
- ::34.311: E/(): ontouchevent
- ::34.311: E/(): onscroll
- ::34.328: E/(): ontouchevent
- ::34.328: E/(): onscroll
- ::34.341: E/(): ontouchevent
- ::34.341: E/(): onscroll
- ::34.342: E/(): ontouchevent
- ::34.342: E/(): onfling

传递顺序onTouchEvent()->GestureDetector.onDown()->GestureDetector.onScroll()->GestureDetector.onfling()

对于点击tv，情况跟上面一样，仅仅是先执行ontouch罢了

- ::20.804: E/(): ontouch
- ::20.805: E/(): ontouchevent
- ::20.806: E/(): ondown
- ::20.837: E/(): ontouchevent
- ::20.854: E/(): ontouchevent
- ::20.872: E/(): ontouchevent
- ::20.889: E/(): ontouchevent
- ::20.906: E/(): ontouchevent
- ::20.923: E/(): ontouchevent
- ::20.940: E/(): ontouchevent
- ::20.957: E/(): ontouchevent
- ::20.975: E/(): ontouchevent
- ::20.981: E/(): onshowpress
- ::20.991: E/(): ontouchevent
- ::21.009: E/(): ontouchevent
- ::21.026: E/(): ontouchevent
- ::21.043: E/(): ontouchevent
- ::21.043: E/(): onscroll
- ::21.060: E/(): ontouchevent
- ::21.063: E/(): ontouchevent

GestureDetector监听时间方法

ondown：这是当按下屏幕的时候执行

onscroll:当屏幕滑动过程中一直时候执行

onfling:滑动屏幕结束，手离开的时候执行

onsingle:点击结束，手离开的时候执行