标签:alt creat gety ontouch 触摸 mat size history 多点触摸
1 //多点触摸 放大,缩小 2 public class MainActivity extends ActionBarActivity { 3 4 @Override 5 protected void onCreate(Bundle savedInstanceState) { 6 super.onCreate(savedInstanceState); 7 setContentView(R.layout.fragment_main); 8 9 } 10 11 @Override 12 public boolean onTouchEvent(MotionEvent event) { 13 // TODO Auto-generated method stub 14 // 两点触摸 15 if (event.getPointerCount() == 2) { 16 if (event.getAction() == MotionEvent.ACTION_MOVE) { 17 int historySize = event.getHistorySize(); 18 if (historySize == 0) { 19 return true; 20 } 21 // 获取第一个手指当前的纵坐标 22 float currentY1 = event.getY(0); 23 // 获取第一个手指当前最新的历史的纵坐标 24 float historyY1 = event.getHistoricalY(0, historySize - 1); 25 // 获取第二个手指当前的纵坐标 26 float currentY2 = event.getY(2); 27 // 获取第二个手指当前最新的历史的纵坐标 28 float historyY2 = event.getHistoricalY(1, historySize - 1); 29 // 两手指当前纵坐标的距离 30 float distance = Math.abs(currentY1 - currentY2); 31 // 两手指最新的历史纵坐标的距离 32 float historyDistance = Math.abs(historyY1 - historyY2); 33 34 if (distance > historyDistance) { 35 Log.i("-====>", "放大"); 36 } else if (distance < historyDistance) { 37 Log.i("-====>", "缩小"); 38 } else { 39 Log.i("-====>", "移动"); 40 } 41 } 42 } 43 return super.onTouchEvent(event); 44 } 45 46 }
标签:alt creat gety ontouch 触摸 mat size history 多点触摸
原文地址:http://www.cnblogs.com/my334420/p/6924586.html