android GestureDetector应用

直接上代码了：
import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.GestureDetector;import android.view.GestureDetector.OnGestureListener;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.widget.TextView;import android.widget.Toast;public class GestureActivity extends Activity implements OnTouchListener,        OnGestureListener {    GestureDetector detector;    public GestureActivity() {        detector = new GestureDetector(this);    }        public void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              setContentView(R.layout.main);              TextView tv = (TextView) findViewById(R.id.TextView001);            //设置tv的******              tv.setOnTouchListener(this);              tv.setFocusable(true);            //必须，view才能够处理不同于Tap（轻触）的hold            tv.setClickable(true);              tv.setLongClickable(true);              detector.setIsLongpressEnabled(true);      }              /*      * 在onTouch()方法中，我们调用GestureDetector的onTouchEvent()方法，将捕捉到的MotionEvent交给GestureDetector      * 来分析是否有合适的callback函数来处理用户的手势      */       public boolean onTouch(View v, MotionEvent event) {          return detector.onTouchEvent(event);      }        // 用户轻触触摸屏，由1个MotionEvent ACTION_DOWN触发      public boolean onDown(MotionEvent arg0) {          Log.i("MyGesture", "onDown");          Toast.makeText(this, "onDown", Toast.LENGTH_SHORT).show();          return true;      }            /*      * 用户轻触触摸屏，尚未松开或拖动，由一个1个MotionEvent ACTION_DOWN触发      * 注意和onDown()的区别，强调的是没有松开或者拖动的状态      */      public void onShowPress(MotionEvent e) {          Log.i("MyGesture", "onShowPress");          Toast.makeText(this, "onShowPress", Toast.LENGTH_SHORT).show();      }            // 用户（轻触触摸屏后）松开，由一个1个MotionEvent ACTION_UP触发      public boolean onSingleTapUp(MotionEvent e) {          Log.i("MyGesture", "onSingleTapUp");          Toast.makeText(this, "onSingleTapUp", Toast.LENGTH_SHORT).show();          return true;      }            // 用户按下触摸屏、快速移动后松开，由1个MotionEvent ACTION_DOWN, 多个ACTION_MOVE, 1个ACTION_UP触发      public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {          Log.i("MyGesture", "onFling");                  // 参数解释：          // e1：第1个ACTION_DOWN MotionEvent          // e2：最后一个ACTION_MOVE MotionEvent          // velocityX：X轴上的移动速度，像素/秒          // velocityY：Y轴上的移动速度，像素/秒                // 触发条件 ：          // X轴的坐标位移大于FLING_MIN_DISTANCE，且移动速度大于FLING_MIN_VELOCITY个像素/秒                    final int FLING_MIN_DISTANCE = 100, FLING_MIN_VELOCITY = 200;          if (e1.getX() - e2.getX() > FLING_MIN_DISTANCE && Math.abs(velocityX) > FLING_MIN_VELOCITY) {              // Fling left              Log.i("MyGesture", "Fling left");              Toast.makeText(this, "Fling Left", Toast.LENGTH_SHORT).show();          } else if (e2.getX() - e1.getX() > FLING_MIN_DISTANCE && Math.abs(velocityX) > FLING_MIN_VELOCITY) {              // Fling right              Log.i("MyGesture", "Fling right");              Toast.makeText(this, "Fling Right", Toast.LENGTH_SHORT).show();          } else if(e2.getY()-e1.getY()>FLING_MIN_DISTANCE && Math.abs(velocityY)>FLING_MIN_VELOCITY) {            // Fling down              Log.i("MyGesture", "Fling down");              Toast.makeText(this, "Fling down", Toast.LENGTH_SHORT).show();        } else if(e1.getY()-e2.getY()>FLING_MIN_DISTANCE && Math.abs(velocityY)>FLING_MIN_VELOCITY) {            // Fling up              Log.i("MyGesture", "Fling up");              Toast.makeText(this, "Fling up", Toast.LENGTH_SHORT).show();        }                          return false;              }            // 用户按下触摸屏，并拖动，由1个MotionEvent ACTION_DOWN, 多个ACTION_MOVE触发      public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {          Log.i("MyGesture", "onScroll");          Toast.makeText(this, "onScroll", Toast.LENGTH_LONG).show();          return true;      }            // 用户长按触摸屏，由多个MotionEvent ACTION_DOWN触发      public void onLongPress(MotionEvent e) {          Log.i("MyGesture", "onLongPress");          Toast.makeText(this, "onLongPress", Toast.LENGTH_LONG).show();      }      }
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