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Android實(shí)現(xiàn)類(lèi)似360,QQ管家那樣的懸浮窗

更新時(shí)間：2013年06月03日 17:22:42 作者：

用到的就是WindowManager以及WindowManager.LayoutParams，對(duì)這個(gè)LayoutParams做文章，當(dāng)設(shè)置為屬性后，然后，創(chuàng)建一個(gè)View，將這個(gè)View添加到WindowManager中就行

一、前言：
我手機(jī)從來(lái)不裝這些東西，不過(guò)，有次看到同事的android手機(jī)上，有個(gè)QQ管家在桌面上浮著，同事拖動(dòng)管家時(shí)，管家就變成一只鳥(niǎo)，桌面下方還有個(gè)彈弓，桌面頂部有只烏鴉，把管家也就是鳥(niǎo)拖動(dòng)到彈弓那，然后，松手，鳥(niǎo)就飛出去。這個(gè)過(guò)程是動(dòng)畫(huà)過(guò)程，做的事，實(shí)際上是清楚內(nèi)存。

二：原理：
其實(shí)，沒(méi)什么原理，用到的就是WindowManager以及WindowManager.LayoutParams，對(duì)這個(gè)LayoutParams做文章，當(dāng)設(shè)置為屬性后，然后，創(chuàng)建一個(gè)View，將這個(gè)View添加到WindowManager中就行。

復(fù)制代碼代碼如下:

 
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); 
} 
/* 
* 顯示應(yīng)用主界面時(shí)，去除懸浮層 
*/ 
@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 在指懸浮在所有界面之上 
* (4.0+系統(tǒng)中，在下拉菜單下面，而在2.3中，在上拉菜單之上) 
*/ 
mWindowMgrParams.type = 2003; 
mWindowMgrParams.format = 1; 

/* 
* 代碼實(shí)際是wmParams.flags |= FLAG_NOT_FOCUSABLE; 
* 40的由來(lái)是wmParams的默認(rèn)屬性（32）+ FLAG_NOT_FOCUSABLE（8） 
*/ 
mWindowMgrParams.flags = 40; 
mWindowMgrParams.gravity = Gravity.LEFT | Gravity.TOP; 
initParams(); 

mFloatsWindowView = new FloatsWindowView(this); 
mWindowMgr.addView(mFloatsWindowView, mWindowMgrParams); 
} 
} 
} 

上面代碼，主要在getWindowLayout函數(shù)中，最后兩行就是創(chuàng)建一個(gè)View，并加入到WindowManager中。
繼承View的懸浮View：

復(fù)制代碼代碼如下:

 
package com.chris.floats.window; 
import android.content.Context; 
import android.content.Intent; 
import android.graphics.drawable.AnimationDrawable; 
import android.util.AttributeSet; 
import android.util.DisplayMetrics; 
import android.view.Gravity; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewTreeObserver.OnPreDrawListener; 
import android.view.WindowManager; 
public class FloatsWindowView extends View { 
private Context mContext = null; 
private WindowManager mWindowMgr = null; 
private WindowManager.LayoutParams mWindowMgrParams = null; 
private AnimationDrawable mAnimationDrawable = null; 

private int iPosX = 0; 
private int iPosY = 0; 
private int iLastPosX = 0; 
private int iLastPosY = 0; 
private boolean bMoved = false; 

public FloatsWindowView(Context context) { 
this(context, null, 0); 
} 
public FloatsWindowView(Context context, AttributeSet attrs) { 
this(context, attrs, 0); 
} 
public FloatsWindowView(Context context, AttributeSet attrs, int defStyle) { 
super(context, attrs, defStyle); 

mContext = context; 
mWindowMgr = (WindowManager)getContext().getApplicationContext().getSystemService("window"); 
mWindowMgrParams = new WindowManager.LayoutParams(); 
initParams(); 

mAnimationDrawable = new AnimationDrawable(); 
for(int i = 0; i < 4; i++){ 
int id = getResources().getIdentifier("a"+ i, "drawable", mContext.getPackageName()); 
mAnimationDrawable.addFrame(getResources().getDrawable(id), 100); 
} 
mAnimationDrawable.setOneShot(false); 
this.setBackgroundDrawable(mAnimationDrawable); 

OnPreDrawListener listener = new OnPreDrawListener(){ 
@Override 
public boolean onPreDraw() { 
mAnimationDrawable.start(); 
return true; 
} 
}; 
this.getViewTreeObserver().addOnPreDrawListener(listener); 
} 

private void initParams(){ 
DisplayMetrics dm = getResources().getDisplayMetrics(); 
mWindowMgrParams.x = dm.widthPixels - 136; 
mWindowMgrParams.y = 300; 
mWindowMgrParams.width = 136; 
mWindowMgrParams.height = 136; 
} 

@Override 
public boolean onTouchEvent(MotionEvent event) { 

switch(event.getAction()){ 
case MotionEvent.ACTION_DOWN: 
iPosX = (int)event.getX(); 
iPosY = (int)event.getY(); 
bMoved = false; 
break; 

case MotionEvent.ACTION_MOVE: 
bMoved = true; 
iLastPosX = (int)event.getX(); 
iLastPosY = (int)event.getY(); 
updatePostion(iLastPosX - iPosX, iLastPosY - iPosY); 
break; 

case MotionEvent.ACTION_UP: 
if(!bMoved){ 
Intent it=new Intent(mContext, MainActivity.class); 
mContext.startActivity(it); 
} 
break; 

default: 
break; 
} 
return true; 
} 
private void updatePostion(int x, int y){ 
mWindowMgrParams.type = 2003; 
mWindowMgrParams.format = 1; 
mWindowMgrParams.flags = 40; 
mWindowMgrParams.gravity = Gravity.LEFT | Gravity.TOP; 
mWindowMgrParams.x += x; 
mWindowMgrParams.y += y; 
mWindowMgr.updateViewLayout(this, mWindowMgrParams); 
} 
} 

之所以將updatePosition中的參數(shù)與Activity中設(shè)置一樣，是為了確保在MOVE時(shí)，造成相對(duì)位置的不一樣，而導(dǎo)致閃礫，大家要是不理解，可以實(shí)驗(yàn)下。

三、小結(jié)：
這篇文章實(shí)現(xiàn)了簡(jiǎn)單的懸浮窗口動(dòng)畫(huà)效果，如果要想做成像360,QQ管家那樣，還需要一些其它的操作：
1. 比如啟動(dòng)一個(gè)后臺(tái)服務(wù)來(lái)監(jiān)控系統(tǒng)信息；
2. ACTION_DOWN時(shí)，修改懸浮窗口上的圖片；
3. ACTION_MOVE時(shí)窗口跟隨；
4. ACTION_UP時(shí)，創(chuàng)建一個(gè)線(xiàn)程，來(lái)完成釋放后，向上運(yùn)動(dòng)的動(dòng)畫(huà)過(guò)程等；

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