- 通过Layout控件捕捉onTouch事件,所以要实现OnTouchListener接口;
- 当用户触摸屏幕的时候,会产生许多手势,这里就包括滑动效果。通过GestureDetector类,我们可以识别很多的手势。所以要实现GestureDetector.OnGestureListener接口(或者GestureDetector.SimpleOnGestureListener),将Touch事件传入GestureDetector对象进行处理。
- 实现两个接口
public class MyActivity extends Activity implements View.OnTouchListener,GestureDetector.OnGest- ureListener {
private RelativeLayout mLinearLayout;
private GestureDetector mGestureDetector;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_face_idcard_identify);
findView();
}
• 给控件注册OnTouch事件,并且允许响应长点击事件
private void findView() {
mLinearLayout = (RelativeLayout) findViewById(R.id.Face_IDCard_Layout);
mLinearLayout.setOnTouchListener(this);
mLinearLayout.setLongClickable(true);
mGestureDetector = new GestureDetector(this, this);
}
• 实现手势识别接口中的方法
//用户按下屏幕就会触发:
@Override
public boolean onDown(MotionEvent e) {
return false;
}
//短按触摸屏
@Override
public void onShowPress(MotionEvent e) {
}
//点击屏幕后抬起时触发该事件
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
//在屏幕上拖动控件
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
return false;
}
//长按触摸屏
@Override
public void onLongPress(MotionEvent e) {
}
//滑屏,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;参数分别表示:按下事件、抬起事件、x方向移动速度、y方向移动速度。
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
final int FLING_MIN_DISTANCE = 100;
final int FLING_MIN_VELOCITY = 200;
if (Math.abs((int) (e1.getX() - e2.getX())) > FLING_MIN_DISTANCE && Math.abs(velocityX) > FLING_MIN_VELOCITY) {
//左滑右滑皆可
Intent intent = new Intent(this, VideoMatchIdentifyGlassesActivity.class);
startActivity(intent);
finish();
}
return false;
}
• 实现OnTouchListener接口中的方法
@Override
public boolean onTouch(View v, MotionEvent event) {
return mGestureDetector.onTouchEvent(event);
}
}