在开发android程序时,有时会需要监测手指滑动屏幕,当手指朝上下左右不同方向滑动时做出不同的响应,那怎么去实现呢?
利用Android提供的手势监测器就可以很方便的实现,直接上代码(已测试通过)
public class CbMainActivity extends Activity implements android.view.GestureDetector.OnGestureListener
{
//定义手势检测器实例
GestureDetector detector; @Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.cb_main);
//创建手势检测器
detector = new GestureDetector(this,this);
} //将该activity上的触碰事件交给GestureDetector处理
public boolean onTouchEvent(MotionEvent me){
return detector.onTouchEvent(me);
} @Override
public boolean onDown(MotionEvent arg0) {
return false;
} /**
* 滑屏监测
*
*/
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
float minMove = 120; //最小滑动距离
float minVelocity = 0; //最小滑动速度
float beginX = e1.getX();
float endX = e2.getX();
float beginY = e1.getY();
float endY = e2.getY(); if(beginX-endX>minMove&&Math.abs(velocityX)>minVelocity){ //左滑
Toast.makeText(this,velocityX+"左滑",Toast.LENGTH_SHORT).show();
}else if(endX-beginX>minMove&&Math.abs(velocityX)>minVelocity){ //右滑
Toast.makeText(this,velocityX+"右滑",Toast.LENGTH_SHORT).show();
}else if(beginY-endY>minMove&&Math.abs(velocityY)>minVelocity){ //上滑
Toast.makeText(this,velocityX+"上滑",Toast.LENGTH_SHORT).show();
}else if(endY-beginY>minMove&&Math.abs(velocityY)>minVelocity){ //下滑
Toast.makeText(this,velocityX+"下滑",Toast.LENGTH_SHORT).show();
} return false;
} @Override
public void onShowPress(MotionEvent arg0) {
// TODO Auto-generated method stub } @Override
public boolean onSingleTapUp(MotionEvent arg0) {
// TODO Auto-generated method stub
return false;
} @Override
public void onLongPress(MotionEvent arg0) {
// TODO Auto-generated method stub } @Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) { return false;
} }
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