android6.0在状态栏添加一键截屏

• 在配置文件frameworks/base/packages/SystemUI/res/values/config.xml下添加screenshot

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1. <string name="quick_setting_tiles_default" translatable="false">  
2.     wifi,bt,inversion,dnd,cell,airplane,rotation,flashlight,location,cast,hotspot,screenshot 
3. </string>  

• 在frameworks/base/packages/SystemUI/src/com/android.systemui/statusbar/phone/QSTileHost.java中得到config.xml中的数据，并进行判断，在方法createTile()中添加

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1. else if(tileSpec.equals(“screenshot”)) return new ScreenShotTile(this); 

• 在QSTileHost.java中还需要往构造方法中传入一个ScreenShotController对象，需要添加如下内容：

  import com.mediatek.systemui.statusbar.policy.ScreenShotController;
  
  private final ScreenShotController mScreenShotController;
  
  public QSTileHost(…………ScreenShotController screenshot){
  ………….
  mScreenShotController=screenshot;
  ………….
  }
  
  public ScreenShotController getScreenShotController(){
  	return mScreenShotController;
  }
  

• 这里涉及到了ScreenShotController，于是我们要去定义它，ScreenShotController是一个接口，内容如下：

  package com.mediatek.systemui.statusbar.policy;
  
  public interface ScreenShotController{
  		boolean isSupportScreenShot();
  }
  

  
  
• 完成ScreenShotTile类，在这个方法中需要完成状态栏图标显示和截屏操作，可以参考其他生成Tile的方法来完成显示图标的方法。该类继承了QSTile类，所以要清楚QSTile这个类的内容。QSTile类中需要添加的内容如下：

  import com.mediatek.systemui.statusbar.policy.ScreenShotController;
  public interface Host{
  ……
  ScreenShotController getScreenShotController();
  …….
  }

• ScreenShotTile类的实现如下所示：

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1. public class ScreenShotTile extends QSTile<QSTile.BooleanState> {  
2.     private static final String TAG = "ScreenShotTile";  
3.     private static final int SCREEN_SHOT_MESSAGE = 10000;  
4.     private static GlobalScreenshot mScreenshot;  
5.       
6.     Handler mHandler = new Handler() {  
7.         public void handleMessage(Message msg) {  
8.             switch (msg.what) {  
9.             case TAKE_SCREEN_SHOT_MESSAGE:  
10.                 final Messenger callback = msg.replyTo;  
11.                 if (mScreenshot == null) {  
12.                     mScreenshot = new GlobalScreenshot(mContext);  
13.                 }  
14.                 mScreenshot.takeScreenshot(new Runnable() {  
15.                     @Override public void run() {  
16.                         Message reply = Message.obtain(null, 1);  
17.                         try {  
18.                             if(callback != null){  
19.                                 callback.send(reply);  
20.                             }  
21.                         }catch(RemoteException e){  
22.                         }  
23.                     }  
24.                 }, msg.arg1 > 0, msg.arg2 > 0);  
25.                 break;                      
26.             default:  
27.                 break;  
28.             }  
29.         }  
30.     };  
31.       
32.     public TakeScreenShotTile(Host host) {  
33.         super(host);  
34.     }  
35.   
36.     @Override  
37.     protected BooleanState newTileState() {  
38.         return new BooleanState();  
39.     }  
40.   
41.     @Override  
42.     public void setListening(boolean listening) {  
43.     }  
44.   
45.     @Override  
46.     protected void handleClick() {  
47.         mHost.startSettingsActivity(new Intent());  
48.         Message msg = mHandler.obtainMessage(SCREEN_SHOT_MESSAGE);  
49.         mHandler.sendMessageDelayed(msg,1000);  
50.     }  
51.     @Override  
52.     protected void handleLongClick() {  
53.         mHost.startSettingsActivity(new Intent());  
54.         Message msg = mHandler.obtainMessage(SCREEN_SHOT_MESSAGE);  
55.         mHandler.sendMessageDelayed(msg,1000);  
56.     }  
57.   
58.     @Override  
59.     protected void handleUpdateState(BooleanState state, Object arg) {  
60.         state.value=false;  
61.         state.autoMirrorDrawable=false;  
62.         state.label = mContext.getString(R.string.screenshot);//加载字符串资源  
63.         state.icon = ResourceIcon.get(R.drawable.ic_qs_screenshot);//加载图片资源} 
64. @Override
65.  public int getMetricsCategory(){ 
66. return MetricsLogger.QS_SCREEN_SHOT; 
67. } 
68. }

• 在frameworks/base/packages/SystemUI/res/中添加对应的字符串和相应分辨率下的图片资源。

1.      在frameworks/base/packages/SystemUI/res/values/strings.xml添加

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1. <string name=screenshot>ScreenShot</string>  

2.      在frameworks/base/packages/SystemUI/res/drawable目录下新建文件ic_qs_screenshot.xml，文件内容如下：

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1. <vector xmlns:android="http://schemas.android.com/apk/res/android"  
2.           android:width="64dp"  
3.           android:height="64dp"  
4.           android:viewportWidth="48.0"  
5.           android:viewportHeight="48.0"  
6.     <path  
7.         android:fillColor="#FFFFFFFF"  
8.         android:pathData="M 48.00,0.00  
9.            C 48.00,0.00 48.00,48.00 48.00,48.00  
10.              48.00,48.00 0.00,48.00 0.00,48.00  
11.              0.00,48.00 0.00,0.00 0.00,0.00  
12.              0.00,0.00 48.00,0.00 48.00,0.00 Z  
13.            M 12.74,5.34  
14.            C 10.77,4.60 8.82,7.07 7.61,8.31  
15.              4.18,11.82 4.05,13.40 9.00,15.00  
16.              9.00,15.00 9.00,39.00 9.00,39.00  
17.              9.00,39.00 33.00,39.00 33.00,39.00  
18.              33.44,40.36 33.66,42.07 35.26,42.66  
19.              37.23,43.40 39.18,40.93 40.39,39.69  
20.              43.82,36.18 43.95,34.60 39.00,33.00  
21.              39.00,33.00 39.00,15.00 39.00,15.00  
22.              31.35,20.68 33.00,24.31 33.00,33.00  
23.              33.00,33.00 18.00,33.00 18.00,33.00  
24.              23.35,27.65 37.10,14.14 40.00,8.00  
25.              40.00,8.00 39.00,7.00 39.00,7.00  
26.              33.12,9.79 19.63,25.36 15.00,31.00  
27.              15.00,31.00 15.00,15.00 15.00,15.00  
28.              22.33,15.00 27.29,16.58 31.00,9.00  
29.              31.00,9.00 15.00,9.00 15.00,9.00  
30.              14.56,7.64 14.34,5.93 12.74,5.34 Z"/>  
31. </vector>  

这里使用了vector绘制矢量图的方式生成状态栏图标，而不是加载具体的图片资源,而path里的内容决定了图片的样式。

• 在frameworks/base/packages/SystemUI/src/com/android/systemui/screenshot/GlobalScreenshot.java中修改进行截屏操作的类和方法的权限，如下所示：

classGlobalScreenshot 声明为 public

method takeScreenshot 声明为public

GlobalScreenshot是实现截屏操作，图片保存，截屏动画的类.

实现截屏的操作的方法是takeScreenshot();

• PhoneStatusBar中定义了一个QSTileHost对象，实参需要传入一个ScreensShotController对象，这里传入的是ScreensShotController的实现类ScreensShotControllerImpl的对象，修改如下

  import com.mediatek.systemui.statusbar.policy.ScreenShotControllerImpl;
  ScreenShotControllerImpl mScreenShitController;
  
  final QSTileHost qsh=new QSTileHost(.................mScreenShotController);

• ScreenShotControllerImpl是接口ScreenShotController的实现类，内容如下：

  package com.mediatek.systemui.statusbar.policy;
  import android.content.Context;
  public class ScreenShotControllerImpl implements ScreenShotController{
  private static final String TAG="ScreenShotControllerImpl";
  private final Context mContext;
  public ScreenShotControllerImpl(Context context){
  mContext=context;
  }
  @Override
  public boolean isSupportScreenShot(){
  return ture;
  }
  }

• QStuner中存在一个类继承了QSTileHost，同时调用了父类的构造方法，因此需要添加一个参数。

  public CustomHost（Context context）{
  super(context,...............,null,null,null);
  }

  最后的那个null是这次修改添加上的。