Android Widget 電池插件的開發實現

在查找並結合多方資料後終於實現，效果圖如下：
長按桌面空白處，出現菜單，點擊Widgets，此時的插件已經裝入：

在電源連接時，機器人周圍會星光閃閃，表明正在充電，不在充電時，周圍的星光會消失。

機器人身上顯示電池電量百分比。

單擊機器人圖標，會跳出電池信息的詳情，再次單擊屏幕關閉詳情信息。

下面介紹代碼的實現：

整個工程主要實現兩個部分，一個是AppWidget部分，實現桌面Widget的顯示，更新等，另一個部分就是點擊widget後出現的顯示電池詳細信息的Activity的實現了。

首先是AppWidget部分，上代碼，NewBatteryWidget.java部分：

1. package com.ritterliu.newBatteryWidget;  
2.   
3. import android.app.AlarmManager;  
4. import android.app.PendingIntent;  
5. import android.app.Service;  
6. import android.appwidget.AppWidgetManager;  
7. import android.appwidget.AppWidgetProvider;  
8. import android.content.BroadcastReceiver;  
9. import android.content.ComponentName;  
10. import android.content.Context;  
11. import android.content.Intent;  
12. import android.content.IntentFilter;  
13. import android.graphics.Bitmap;  
14. import android.graphics.BitmapFactory;  
15. import android.os.IBinder;  
16. import android.widget.RemoteViews;  
17.   
18. public class NewBatteryWidget extends AppWidgetProvider{      
19.     private static int currentBatteryLevel;  
20.     private static int currentBatteryStatus;  
21.   
22.     public void onUpdate(Context context,AppWidgetManager appWidgetManager,int[] appWidgetIds)  
23.     {  
24.         super.onUpdate(context, appWidgetManager, appWidgetIds);  
25.       
26.         /** 啟動自動更新電池信息的service */  
27.         context.startService(new Intent(context,updateService.class));  
28.       
29.         /** 為AppWidget設置點擊事件的響應，啟動顯示電池信息詳情的activity */   
30.         Intent startActivityIntent = new Intent(context,NewBatteryInfoActivity.class);  
31.         PendingIntent Pintent = PendingIntent.getActivity(context,0,startActivityIntent,0);  
32.         RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.newrelativelayout);  
33.         views.setOnClickPendingIntent(R.id.imageView,Pintent);  
34.         appWidgetManager.updateAppWidget(appWidgetIds,views);  
35.               
36.     }  
37.       
38.     /** 自動更新電池信息的service,通過AlarmManager實現定時不間斷地發送電池信息 */  
39.     public static class updateService extends Service{  
40.         Bitmap bmp;     //定義機器人圖片   
41.         @Override  
42.         public IBinder onBind(Intent intent) {  
43.             // TODO Auto-generated method stub   
44.             return null;  
45.         }  
46.           
47.         /** 定義一個接收電池信息的broascastReceiver */  
48.         private BroadcastReceiver batteryReceiver=new BroadcastReceiver()  
49.         {  
50.             @Override  
51.             public void onReceive(Context context, Intent intent) {  
52.                 // TODO Auto-generated method stub   
53.                 currentBatteryLevel=intent.getIntExtra("level", 0);  
54.                 currentBatteryStatus=intent.getIntExtra("status", 0);  
55.             }  
56.               
57.         };  
58.           
59.           
60.         public void onStart(Intent intent,int startId)  
61.         {  
62.             super.onStart(intent, startId);  
63.               
64.             /** 注冊接收器 */  
65.             registerReceiver(batteryReceiver,new IntentFilter(Intent.ACTION_BATTERY_CHANGED));  
66.               
67.             /** 定義一個AppWidgetManager */  
68.             AppWidgetManager manager=AppWidgetManager.getInstance(this);  
69.               
70.             /** 定義一個RemoteViews，實現對AppWidget界面控制 */  
71.             RemoteViews views=new RemoteViews(getPackageName(),R.layout.newrelativelayout);  
72.               
73.               
74.             if(currentBatteryStatus==2||currentBatteryStatus==5)    //當正在充電或充滿電時，顯示充電的圖片   
75.             {  
76.                 if(currentBatteryLevel>=95)  
77.                 {  
78.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.jcharge);  
79.                 }  
80.                 else if(currentBatteryLevel>=85&& currentBatteryLevel<95)  
81.                 {  
82.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.icharge);  
83.                 }  
84.                 else if(currentBatteryLevel>=75&& currentBatteryLevel<85)  
85.                 {  
86.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.hcharge);  
87.                 }  
88.                 else if(currentBatteryLevel>=65&& currentBatteryLevel<75)  
89.                 {  
90.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.gcharge);  
91.                 }  
92.                 else if(currentBatteryLevel>=55&& currentBatteryLevel<65)  
93.                 {  
94.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.fcharge);  
95.                 }  
96.                 else if(currentBatteryLevel>=45&& currentBatteryLevel<55)  
97.                 {  
98.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.echarge);      
99.                 }  
100.                 else if(currentBatteryLevel>=35&& currentBatteryLevel<45)  
101.                 {  
102.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.dcharge);      
103.                 }  
104.                 else if(currentBatteryLevel>=25&& currentBatteryLevel<35)  
105.                 {  
106.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.ccharge);      
107.                 }  
108.                 else if(currentBatteryLevel>=15&& currentBatteryLevel<25)  
109.                 {  
110.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.bcharge);  
111.                 }  
112.                 else  
113.                 {  
114.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.acharge);      
115.                 }     
116.             }  
117.             else    //未在充電時，顯示不在充電狀態的系列圖片   
118.             {  
119.                 if(currentBatteryLevel>=95)  
120.                 {  
121.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.j);  
122.                 }  
123.                 else if(currentBatteryLevel>=85&¤tBatteryLevel<95)  
124.                 {  
125.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.i);  
126.                 }  
127.                 else if(currentBatteryLevel>=75&¤tBatteryLevel<85)  
128.                 {  
129.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.h);  
130.                 }  
131.                 else if(currentBatteryLevel>=65&¤tBatteryLevel<75)  
132.                 {  
133.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.g);  
134.                 }  
135.                 else if(currentBatteryLevel>=55&¤tBatteryLevel<65)  
136.                 {  
137.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.f);  
138.                 }  
139.                 else if(currentBatteryLevel>=45&¤tBatteryLevel<55)  
140.                 {  
141.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.e);    
142.                 }  
143.                 else if(currentBatteryLevel>=35&¤tBatteryLevel<45)  
144.                 {  
145.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.d);    
146.                 }  
147.                 else if(currentBatteryLevel>=25&¤tBatteryLevel<35)  
148.                 {  
149.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.c);    
150.                 }  
151.                 else if(currentBatteryLevel>=15&¤tBatteryLevel<25)  
152.                 {  
153.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.b);  
154.                 }  
155.                 else  
156.                 {  
157.                     bmp=BitmapFactory.decodeResource(getResources(),R.drawable.a);    
158.                 }     
159.             }     
160.   
161.             /** 設置AppWidget上顯示的圖片和文字的內容 */  
162.                 views.setImageViewBitmap(R.id.imageView,bmp);  
163.             views.setTextViewText(R.id.tv,currentBatteryLevel+"%");  
164.               
165.             ComponentName thisWidget=new ComponentName(this,NewBatteryWidget.class);  
166.           
167.             /** 使用AlarmManager實現每隔一秒發送一次更新提示信息，實現信息實時動態變化 */  
168.             long now=System.currentTimeMillis();  
169.             long pause=1000;  
170.               
171.             Intent alarmIntent=new Intent();  
172.             alarmIntent=intent;  
173.               
174.             PendingIntent pendingIntent=PendingIntent.getService(this, 0, alarmIntent, 0);  
175.             AlarmManager alarm=(AlarmManager)getSystemService(Context.ALARM_SERVICE);  
176.             alarm.set(AlarmManager.RTC_WAKEUP,now+pause,pendingIntent);  
177.               
178.             /** 更新AppWidget */  
179.                         manager.updateAppWidget(thisWidget, views);  
180.   
181.         }     
182.     }  
183. }