第三步:加入权限
在AndroidManifest.xml中加入如下的权限：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
效果如下:
重要代码 : 创建 MyApplication
import android.app.Application;
import android.view.WindowManager;
public class MyApplication extends Application {
/**
* 创建全局变量
* 注意在AndroidManifest.xml中的Application节点添加android:name=".MyApplication"属性
*
*/
private WindowManager.LayoutParams wmParams=new WindowManager.LayoutParams();
public WindowManager.LayoutParams getMywmParams(){
return wmParams;
}
}
创建自定义View 继承ImageView
import android.content.Context;
import android.util.Log;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.widget.ImageView;
public class MyFloatView extends ImageView {
private float mTouchStartX;
private float mTouchStartY;
private float x;
private float y;
private WindowManager wm=(WindowManager)getContext().getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
//此wmParams为获取的全局变量，用以保存悬浮窗口的属性
private WindowManager.LayoutParams wmParams = ((MyApplication)getContext().getApplicationContext()).getMywmParams();
public MyFloatView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//获取相对屏幕的坐标，即以屏幕左上角为原点
x = event.getRawX();
y = event.getRawY()-25; //25是系统状态栏的高度
Log.i("currP", "currX"+x+"====currY"+y);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//获取相对View的坐标，即以此View左上角为原点
mTouchStartX = event.getX();
mTouchStartY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
updateViewPosition();
break;
case MotionEvent.ACTION_UP:
updateViewPosition();
mTouchStartX=mTouchStartY=0;
break;
}
return true;
}
private void updateViewPosition(){
//更新浮动窗口位置参数
wmParams.x=(int)( x-mTouchStartX);
wmParams.y=(int) (y-mTouchStartY);
wm.updateViewLayout(this, wmParams);
}
}
