GestureDetector简单应用

GestureDetector是对Touch事件的封装化处理，辅助我们队事件的行为加以区别并监听

onScroll:在屏幕上划出一段距离会触发

onFling:猛的一划会触发

要想让手势类监听到touch事件 下面例子是在touch中写的

对于activity,可以复写dispatchTouchEvent方法中调用  mGestureDetector.onTouchEvent(event);

总之需要调用 mGestureDetector.onTouchEvent(event);才能实现手势类的监听效果

代码例子：

package com.test.jd.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;

public class MainActivity extends Activity {

    private Button mButton;
    private GestureDetector mGestureDetector;

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

        mGestureDetector = new GestureDetector(this, new MyOnGestureListener());

        mButton = (Button) findViewById(R.id.btn_textgesture);
        mButton.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Log.i(getClass().getName(), "onTouch-----" + getActionName(event.getAction()));
                mGestureDetector.onTouchEvent(event);
                // 一定要返回true，不然获取不到完整的事件
                return true;
            }
        });
    }

    private String getActionName(int action) {
        String name = "";
        switch (action) {
            case MotionEvent.ACTION_DOWN: {
                name = "ACTION_DOWN";
                break;
            }
            case MotionEvent.ACTION_MOVE: {
                name = "ACTION_MOVE";
                break;
            }
            case MotionEvent.ACTION_UP: {
                name = "ACTION_UP";
                break;
            }
            default:
                break;
        }
        return name;
    }

    class MyOnGestureListener extends SimpleOnGestureListener {
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            Log.i(getClass().getName(), "onSingleTapUp-----" + getActionName(e.getAction()));
            return false;
        }

        @Override
        public void onLongPress(MotionEvent e) {
            Log.i(getClass().getName(), "onLongPress-----" + getActionName(e.getAction()));
        }

        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            Log.i(getClass().getName(),
                    "onScroll-----" + getActionName(e2.getAction()) + ",(" + e1.getX() + "," + e1.getY() + ") ,("
                            + e2.getX() + "," + e2.getY() + ")");
            return false;
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            Log.i(getClass().getName(),
                    "onFling-----" + getActionName(e2.getAction()) + ",(" + e1.getX() + "," + e1.getY() + ") ,("
                            + e2.getX() + "," + e2.getY() + ")");
            return false;
        }

        @Override
        public void onShowPress(MotionEvent e) {
            Log.i(getClass().getName(), "onShowPress-----" + getActionName(e.getAction()));
        }

        @Override
           public boolean onDown(MotionEvent e) {
            Log.i(getClass().getName(), "onDown-----" + getActionName(e.getAction()));
            return false;
        }

        @Override
        public boolean onDoubleTap(MotionEvent e) {
            Log.i(getClass().getName(), "onDoubleTap-----" + getActionName(e.getAction()));
            return false;
        }

        @Override
        public boolean onDoubleTapEvent(MotionEvent e) {
            Log.i(getClass().getName(), "onDoubleTapEvent-----" + getActionName(e.getAction()));
            return false;
        }

        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            Log.i(getClass().getName(), "onSingleTapConfirmed-----" + getActionName(e.getAction()));
            return false;
        }
    }
}

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/btn_textgesture"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="@string/app_name" />

</RelativeLayout>

下载利用手势类关闭当前Activity的例子:http://pan.baidu.com/s/1mgMfdVy

参考:http://www.apkbus.com/android-128069-1-1.html