| 发表于 2013-6-24 20:26:57 |只看该作者
一、前言:
我手机从来不装这些东西,不过,有次看到同事的android手机上,有个QQ管家在桌面上浮着,同事拖动管家时,管家就变成一只鸟,桌面下方还有个弹弓,桌面顶部有只乌鸦,把管家也就是鸟拖动到弹弓那,然后,松手,鸟就飞出去。这个过程是动画过程,做的事,实际上是清楚内存。
二:原理:
其实,没什么原理,用到的就是WindowManager以及WindowManager.LayoutParams,对这个LayoutParams做文章,当设置为属性后,然后,创建一个View,将这个View添加到WindowManager中就行。
package com.chris.floats.window;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.WindowManager;
import android.app.Activity;
import android.content.Context;
public class MainActivity extends Activity {
private static WindowManager mWindowMgr = null;
private WindowManager.LayoutParams mWindowMgrParams = null;
private static FloatsWindowView mFloatsWindowView = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/*
* 显示应用主界面时,去除悬浮层
*/
@Override
public void onWindowFocusChanged(boolean hasFocus) {
if(hasFocus){
if(mFloatsWindowView != null){
mWindowMgr.removeView(mFloatsWindowView);
mFloatsWindowView = null;
}
}else{
getWindowLayout();
}
}
private void initParams(){
DisplayMetrics dm = getResources().getDisplayMetrics();
mWindowMgrParams.x = dm.widthPixels - 136;
mWindowMgrParams.y = 300;
mWindowMgrParams.width = 136;
mWindowMgrParams.height = 136;
}
private void getWindowLayout(){
if(mFloatsWindowView == null){
mWindowMgr = (WindowManager)getBaseContext().getSystemService(Context.WINDOW_SERVICE);
mWindowMgrParams = new WindowManager.LayoutParams();
/*
* 2003 在指悬浮在所有界面之上
* (4.0+系统中,在下拉菜单下面,而在2.3中,在上拉菜单之上)
*/
mWindowMgrParams.type = 2003;
mWindowMgrParams.format = 1;
/*
* 代码实际是wmParams.flags |= FLAG_NOT_FOCUSABLE;
* 40的由来是wmParams的默认属性(32)+ FLAG_NOT_FOCUSABLE(8)
*/
mWindowMgrParams.flags = 40;
mWindowMgrParams.gravity = Gravity.LEFT | Gravity.TOP;
initParams();
mFloatsWindowView = new FloatsWindowView(this);
mWindowMgr.addView(mFloatsWindowView, mWindowMgrParams);
}
}
}
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