Android實現偵聽電池狀態顯示、電量及充電動態顯示的方法

本文實例講述了Android實現偵聽電池狀態顯示、電量及充電動態顯示的方法，是Android應用程序開發中非常常用的重要功能。分享給大家供大家參考之用。具體方法如下：

使用android系統的電池偵聽和系統的電池圖片如下；

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，如下圖所示：
 

1.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>

2.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); 

3.接收廣播

//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：

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; 
}

4.在onResume方法中注冊消息處理器

registerReceiver(mIntentReceiver, mIntentFilter); 

5.在onPause方法中注銷

unregisterReceiver(mIntentReceiver);

希望本文所述對大家的Android程序設計有所幫助。