android 手势识别（一）

一、使用GestureDetector 实现简单的屏幕左划右划事件

public class MainActivity extends Activity {private ImageView img;private GestureDetector mygestureDetector;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        img=(ImageView) findViewById(R.id.img);        mygestureDetector=new GestureDetector(new myGestureListener());        img.setOnTouchListener(new OnTouchListener() {            @Override//捕获到搓摩屏幕发生的Event 事件            public boolean onTouch(View v, MotionEvent event) {                mygestureDetector.onTouchEvent(event);//转发给SimpleOnGestureListener类                return true;            }        });    }    class myGestureListener extends SimpleOnGestureListener{        @Override //滑动e1 为第一个事件 e2为第二个事件        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,                float velocityY) {            if(e1.getX()-e2.getX()>50){            Toast.makeText(MainActivity.this, "从右往左滑动", Toast.LENGTH_SHORT).show();            }else if(e2.getX()-e1.getX()>50){                Toast.makeText(MainActivity.this, "从左往右滑动", Toast.LENGTH_SHORT).show();                         }            return super.onFling(e1, e2, velocityX, velocityY);        }    }}

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