android GestureDetector应用
直接上代码了:[java]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holdtv.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 leftLog.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 rightLog.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 downLog.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 upLog.i("MyGesture", "Fling up");Toast.makeText(this, "Fling up", Toast.LENGTH_SHORT).show();}&补充:移动开发 , Android ,
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