Android-->View.setX()和.setY()的使用(移动布局,设置布局位置,动态添加View)

public class TouchView extends ImageView {

public TouchView(Context context) {
super(context);

this.setImageResource(R.drawable.ic_launcher);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(100, 100);
}

float downX, downY;
float moveX, moveY;

@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
downX = event.getRawX();
downY = event.getRawY();
}

if (event.getAction() == MotionEvent.ACTION_MOVE) {
moveX = event.getRawX();
moveY = event.getRawY();

this.setX(getX() + (moveX - downX));
this.setY(getY() + (moveY - downY));
downX = moveX;
downY = moveY;
}

return true;// 返回true 表示 处理Touch事件
// return super.onTouchEvent(event);
}

}

public class MainActivity extends Activity {

LinearLayout linear;
RelativeLayout relative;
FrameLayout frame;
AbsoluteLayout absolute;

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

linear = (LinearLayout) findViewById(R.id.linear);
relative = (RelativeLayout) findViewById(R.id.relative);
frame = (FrameLayout) findViewById(R.id.frame);
absolute = (AbsoluteLayout) findViewById(R.id.absolute);

linear.addView(new TouchView(this));
relative.addView(new TouchView(this));
frame.addView(new TouchView(this));
absolute.addView(new TouchView(this));
}
}