Android 手勢識別

此demo演示了android的手勢識別，demo地址：http://download.csdn.net/detail/youmingyu/9721942

代碼：

package fk.androiddemo_032;

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
//一：獲得GestureDetector對象，並傳入手勢監聽類對象
//二：相應控件設置OnTouch監聽，允許長點擊
//三：在OnTouch的方法裏傳遞手勢動作
public class MainActivity extends Activity implements View.OnTouchListener{
    TextView text;
    GestureDetector gestureDetector;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        text = (TextView)findViewById(R.id.text);
        text.setOnTouchListener(this);//設置Touch監聽
        text.setLongClickable(true);//允許長點擊

        //手勢檢測
        gestureDetector=new GestureDetector(this,new MyGestureListener());
    }

    @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {
        return gestureDetector.onTouchEvent(motionEvent);//傳入手勢
    }

    //判斷是什麼手勢，執行相應操作
    class MyGestureListener implements GestureDetector.OnGestureListener{
        private static final int MaxWidth=80;
        private static final int MaxSpeed=200;

        @Override
        public boolean onDown(MotionEvent motionEvent) {
            return false;
        }
        @Override
        public void onShowPress(MotionEvent motionEvent) {}
        @Override
        public boolean onSingleTapUp(MotionEvent motionEvent) {return false;}
        @Override
        public boolean onScroll(MotionEvent motionEvent, MotionEvent motionEvent1, float v, float v1) {return false;}
        @Override
        public void onLongPress(MotionEvent motionEvent) {}
        @Override
        public boolean onFling(MotionEvent motionEvent, MotionEvent motionEvent1, float v, float v1) {
            // 在這裏，可以判斷左右手勢，或者增加自己的手勢判斷
            // 同時，在這裏增加相應的手勢處理函數來完成相應的效果
            if (motionEvent.getX() - motionEvent1.getX() >MaxWidth && Math.abs(v)>MaxSpeed) {
                Toast.makeText(MainActivity.this, "您現在是左滑！", Toast.LENGTH_SHORT).show();
                return true;
            } else if (motionEvent1.getX()- motionEvent.getX() > MaxWidth && Math.abs(v)>MaxSpeed) {
                Toast.makeText(MainActivity.this, "您現在是右滑", Toast.LENGTH_SHORT).show();
                return true;
            }
            return false;
        }

    }

}

圖片：