@SuppressWarnings("deprecation")
public class Main extends Activity {
/** Called when the activity is first created. */
TextView tv;
boolean flag = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView) findViewById(R.id.tv);
tv.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
flag = true;
// 當控制項被點中時，flag設為true
//不能寫在onClick事件中
return false;
}
});
}
@SuppressWarnings("deprecation")
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
if (flag) {
// flag為true即控制項被點到時，執行移動控制項操作
int x = (int) event.getX();
int y = (int) event.getY();
// 得到X，Y座標
LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT, x - 10, y - 40);
// 四參數分別為寬，高，X，Y座標，wrap_conent為根據內容自動調整
tv.setLayoutParams(params);
// 設置最終位置
}
if (event.getAction() == MotionEvent.ACTION_UP) {
// 手指離開螢幕時，把flag設為false
flag = false;
}
return super.onTouchEvent(event);
}
}
如果螢幕上有多個控制項需要移動，可以加個int，用於存儲控制項的ID
另一種方法：
int[] temp = new int[] { 0, 0 };
@Override
public boolean onTouch(View v, MotionEvent event) {
int eventaction = event.getAction();
int x = (int) event.getRawX();
int y = (int) event.getRawY();
int p = (int) event.getX();
int q = (int) event.getY();
switch (eventaction) {
case MotionEvent.ACTION_DOWN:
temp[0] = (int) event.getX();
temp[1] = y - v.getTop();
break;
case MotionEvent.ACTION_MOVE:
int l = x - temp[0];
int t = y - temp[1];
int r = x + v.getWidth() - temp[0];
int b = y - temp[1] + v.getHeight();
v.layout(l, t, r,b);
v.postInvalidate();
break;
case MotionEvent.ACTION_UP:
break;
}
return false;
}