android 電池偵聽顯示

今天想使用android系統的電池偵聽和系統的電池圖片；

引入源代碼中的兩個xml文件（這裡我在android2.2的jar包中找不到，所以才引入，源代碼路徑：C:\android-sdk-windows\platforms\android-8\data\res\drawable），之後會發現stat_sys_battery.xml報錯，所以我就將下圖

這些圖引入到我的drawable目錄下，然後將stat_sys_battery.xml中的圖片引入路徑更改，如下：

<level-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:maxLevel="4" android:drawable="@drawable/stat_sys_battery_0" />
    <item android:maxLevel="14" android:drawable="@drawable/stat_sys_battery_10" />
    <item android:maxLevel="29" android:drawable="@drawable/stat_sys_battery_20" />
    <item android:maxLevel="49" android:drawable="@drawable/stat_sys_battery_40" />
    <item android:maxLevel="69" android:drawable="@drawable/stat_sys_battery_60" />
    <item android:maxLevel="89" android:drawable="@drawable/stat_sys_battery_80" />
    <item android:maxLevel="100" android:drawable="@drawable/stat_sys_battery_100" />
</level-list>

接下來是在activity中的操作：

創建一個IntentFilter

private IntentFilter mIntentFilter; 

在oncreate的方法中：加入：

//電池相關
mIntentFilter = new IntentFilter(); 
mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED); 

//聲明消息處理過程 
       private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() { 
           @Override 
           public void onReceive(Context context, Intent intent) { 
               String action = intent.getAction(); 
               int status = intent.getIntExtra("status", 0);
               int health = intent.getIntExtra("health", 0);
               boolean present = intent.getBooleanExtra("present", false);
               int level = intent.getIntExtra("level", 0);
               int scale = intent.getIntExtra("scale", 0);
               int icon_small = intent.getIntExtra("icon-small", 0);
               int plugged = intent.getIntExtra("plugged", 0);
               int voltage = intent.getIntExtra("voltage", 0);
               int temperature = intent.getIntExtra("temperature", 0);
               String technology = intent.getStringExtra("technology");
               String statusString = "";
               switch (status) {
               case BatteryManager.BATTERY_STATUS_UNKNOWN:
                   statusString = "unknown";
                   break;
               case BatteryManager.BATTERY_STATUS_CHARGING:
                   statusString = "charging";
                   battery_image.setImageResource(R.drawable.stat_sys_battery_charge);
                   battery_image.getDrawable().setLevel(level);
                   break;
               case BatteryManager.BATTERY_STATUS_DISCHARGING:
                   statusString = "discharging";
                   battery_image.setImageResource(R.drawable.stat_sys_battery);
                   battery_image.getDrawable().setLevel(level);
                   break;
               case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
                   statusString = "not charging";
                   break;
               case BatteryManager.BATTERY_STATUS_FULL:
                   statusString = "full";
                   break;
               }
               String healthString = "";
               switch (health) {
               case BatteryManager.BATTERY_HEALTH_UNKNOWN:
                   healthString = "unknown";
                   break;
               case BatteryManager.BATTERY_HEALTH_GOOD:
                   healthString = "good";
                   break;
               case BatteryManager.BATTERY_HEALTH_OVERHEAT:
                   healthString = "overheat";
                   break;
               case BatteryManager.BATTERY_HEALTH_DEAD:
                   healthString = "dead";
                   break;
               case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
                   healthString = "voltage";
                   break;
               case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:
                   healthString = "unspecified failure";
                   break;
               }
               String acString = "";
               switch (plugged) {
               case BatteryManager.BATTERY_PLUGGED_AC:
                   acString = "plugged ac";
                   break;
               case BatteryManager.BATTERY_PLUGGED_USB:
                   acString = "plugged usb";
                   break;
               }
               Log.i("cat", statusString);
               Log.i("cat", healthString);
               Log.i("cat", String.valueOf(present));
               Log.i("cat", String.valueOf(level));
               Log.i("cat", String.valueOf(scale));
               Log.i("cat", String.valueOf(icon_small));
               Log.i("cat", acString);
               Log.i("cat", String.valueOf(voltage));
               Log.i("cat", String.valueOf(temperature));
               Log.i("cat", technology);
               //要看看是不是我們要處理的消息 
               if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {            
                   //電池電量，數字 
                   Log.d("Battery", "" + intent.getIntExtra("level", 0));                
                   //電池最大容量 
                   Log.d("Battery", "" + intent.getIntExtra("scale", 0));                
                   //電池伏數 
                   Log.d("Battery", "" + intent.getIntExtra("voltage", 0));                
                   //電池溫度 
                   Log.d("Battery", "" + intent.getIntExtra("temperature", 0)); 
                   //電池狀態，返回是一個數字 
                   // BatteryManager.BATTERY_STATUS_CHARGING 表示是充電狀態 
                   // BatteryManager.BATTERY_STATUS_DISCHARGING 放電中 
                   // BatteryManager.BATTERY_STATUS_NOT_CHARGING 未充電 
                   // BatteryManager.BATTERY_STATUS_FULL 電池滿 
                   Log.d("Battery", "ss" + intent.getIntExtra("status", BatteryManager.BATTERY_STATUS_CHARGING)); 
                   //充電類型 BatteryManager.BATTERY_PLUGGED_AC 表示是充電器，不是這個值，表示是 USB 
                   Log.d("Battery", "" + intent.getIntExtra("plugged", 0)); 
                   //電池健康情況，返回也是一個數字 
                   //BatteryManager.BATTERY_HEALTH_GOOD 良好 
                   //BatteryManager.BATTERY_HEALTH_OVERHEAT 過熱 
                   //BatteryManager.BATTERY_HEALTH_DEAD 沒電 
                   //BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE 過電壓 
                   //BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE 未知錯誤 
                   Log.d("Battery", "" + intent.getIntExtra("health", BatteryManager.BATTERY_HEALTH_UNKNOWN)); 
               } 
           } 
       }; 

——————————————————————————————-

這裡真正處理圖片變換的是以下幾句話：其他的我是在做備注

switch (status) {
               case BatteryManager.BATTERY_STATUS_UNKNOWN:
                   statusString = "unknown";
                   break;
               case BatteryManager.BATTERY_STATUS_CHARGING:
                   statusString = "charging";
                   battery_image.setImageResource(R.drawable.stat_sys_battery_charge);
                   battery_image.getDrawable().setLevel(level);
                   break;
               case BatteryManager.BATTERY_STATUS_DISCHARGING:
                   statusString = "discharging";
                   battery_image.setImageResource(R.drawable.stat_sys_battery);
                   battery_image.getDrawable().setLevel(level);
                   break;
               case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
                   statusString = "not charging";
                   break;
               case BatteryManager.BATTERY_STATUS_FULL:
                   statusString = "full";
                   break;
               }

在onResume方法中注冊消息處理器 
 

registerReceiver(mIntentReceiver, mIntentFilter);

在onPause方法中注銷

unregisterReceiver(mIntentReceiver);