Android 开发实例：图片拖动的实现(java)

核心提示：// 得到图片的大小，位置，Android 开发实例：图片拖动的实现(java)(2)，在text view 2 上显示paramsIv_1 = (LayoutParams) iv_1.getLayoutParams();picHeight = pic.getIntrinsicHeight();picWidth = p

// 得到图片的大小，位置，在text view 2 上显示

paramsIv_1 = (LayoutParams) iv_1.getLayoutParams();

picHeight = pic.getIntrinsicHeight();

picWidth = pic.getIntrinsicWidth();

picX = paramsIv_1.x;

picY = paramsIv_1.y;

tv_2 = (TextView) this.findViewById(R.id.TextInfo_2);

String str2 = "Anjoy: picWidth = " + picWidth + ", picHeight = "

+ picHeight + ", picX = " + picX + ", picY = " + picY;

tv_2.setText(str2);

tv_2.setLines(2);

// 得到text view 3对象

tv_3 = (TextView) this.findViewById(R.id.TextInfo_3);

}

@Override

public boolean onTouchEvent(MotionEvent event) {

float x = event.getX();

float y = event.getY();

String str1 = "abc", str2 = "abc", str3 = "abc";

switch (event.getAction()) {

case MotionEvent.ACTION_DOWN:

// if语句 判断当鼠标点下时，是否击中图片

if (x >= picX && x <= picX + picWidth && y >= picY

&& y <= picY + picHeight) {

clickPic = true;

} else

clickPic = false;

str1 = "Anjoy: x = " + (int) x + ": y = " + (int) y;

tv_3.setText(str1);

break;

case MotionEvent.ACTION_UP:

// 经测试，Action_Move的终点即为up时所在的坐标，

// 所以当鼠标up时，无需update图片位置

// paramsIv_1 = (LayoutParams) iv_1.getLayoutParams();

// picX = paramsIv_1.x;

// picY = paramsIv_1.y;

// tv_2 = (TextView) this.findViewById(R.id.TextInfo_2);

// str2 = "Anjoy: picWidth = " + picWidth + ", picHeight = "

// + picHeight + ", picX = " + picX + ", picY = " + picY;

// tv_2.setText(str2);

// Log.i("up", str2);

break;

case MotionEvent.ACTION_MOVE:

// 当Action_Down击中图片时，才执行move的动作