Android拖动控件改变其位置

原创 2012年12月26日 17:54:25

3100

mainActivity如下:

[java] view plain copy

package cn.dragtest;
import android.app.Activity;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity implements OnTouchListener{
private Button mButton;
private ImageView mImageView;
private DisplayMetrics displayMetrics;
private float lastX=0;
private float lastY=0;
private int screenWidth=0;
private int screenHeight=0;
private int left;
private int top;
private int right;
private int bottom;
private boolean isFirst=true;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initView();
}
private void initView() {
mButton=(Button) findViewById(R.id.button);
mImageView=(ImageView) findViewById(R.id.imageView);
mButton.setOnTouchListener(this);
mImageView.setOnTouchListener(this);
}
public boolean onTouch(View view, MotionEvent event) {
if (isFirst) {
// 得到屏幕的宽
displayMetrics = getResources().getDisplayMetrics();
screenWidth = displayMetrics.widthPixels;
// 得到标题栏和状态栏的高度
Rect rect = new Rect();
Window window = getWindow();
mImageView.getWindowVisibleDisplayFrame(rect);
int statusBarHeight = rect.top;
int contentViewTop = window.findViewById(Window.ID_ANDROID_CONTENT).getTop();
int titleBarHeight = contentViewTop - statusBarHeight;
// 得到屏幕的高
screenHeight = displayMetrics.heightPixels- (statusBarHeight + titleBarHeight);
isFirst=false;
}
int action=event.getAction();
switch (action) {
//按下
case MotionEvent.ACTION_DOWN:
//按下处坐标
lastX=event.getRawX();
lastY=event.getRawY();
break;
//移动
case MotionEvent.ACTION_MOVE:
//移动的距离
float distanceX=event.getRawX()-lastX;
float distanceY=event.getRawY()-lastY;
//移动后控件的坐标
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