Question

android中的imageview怎么设置上下左右的滑动事件？

要实现的功能是当imageview向某一个方向滑动时，出发一段函数，谢谢，最好给一段代码例子

Answer 1

private float mPosX;
private float mPosY;
private float mCurrentPosX;
private float mCurrentPosY;
private ImageView imageview;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

imageview = (ImageView) findViewById(R.id.imageview);

imageview.setOnTouchListener(new View.OnTouchListener() {

@Override
public boolean onTouch(View v, MotionEvent event) {

switch (event.getAction()) {
// 按下
case MotionEvent.ACTION_DOWN:
mPosX = event.getX();
mPosY = event.getY();
break;
// 移动
case MotionEvent.ACTION_MOVE:
mCurrentPosX = event.getX();
mCurrentPosY = event.getY();

if (mCurrentPosX - mPosX > 0 && Math.abs(mCurrentPosY - mPosY) < 10)
Log.e("", "向右");
else if (mCurrentPosX - mPosX < 0 && Math.abs(mCurrentPosY - mPosY) < 10)
Log.e("", "向左");
else if (mCurrentPosY - mPosY > 0 && Math.abs(mCurrentPosX - mPosX) < 10)
Log.e("", "向下");
else if (mCurrentPosY - mPosY < 0 && Math.abs(mCurrentPosX - mPosX) < 10)
Log.e("", "向上");

break;
// 拿起
case MotionEvent.ACTION_UP:

break;
default:
break;
}
return true;
}
});
}