Android 开发-电池（Battery）电量等数据的监听，用Service，Broadcaset，以及Thread的方式实现

妖狐艹你老母 2023-10-16 18:37 8阅读 0赞

#### 案例介绍： ####

> 实现一个电池属性实时监听器。这些熟悉包括温度，电池电量....等等。而且，使用Service，Broadcast，以及Thread的方式来实现。

#### 实现原理： ####

> 1.在Service中开启线程；
> 
> 2.在Service中，监听
> 
>     ACTION_BATTERY_CHANGED
> 
> 实现一个BroadcastReceiver的
> 
>     onReceive（Context ctx，Intent intent）
>     中，就包含了电池属性相关的值。
> 
> 3.在线程中，将intent的值写入到文件。
> 
> 4.在ui中，可以读取文件，进行显示。

#### 核心代码： ####

MyBatteryService.java

public class MyBatteryService extends Service {
    
    	private final static String TAG = "BatteryService";
    	
    	public static final String LOGFILEPATH = "BATTERYSERVICE/battery.csv";
    	
    	private final static String[] batteryExtraKeys = {"level", "scale", "voltage", "temperature", "plugged", "status", "health", "present", "technology", "icon-small"};
    
    	private File mBatteryLogFile;
    	private int mCount;
    	private Intent mLastBatteryIntent;
        private boolean mQuitThread;
        private boolean mThreadRunning = false;
    
        @Override
        public void onCreate() {
        	super.onCreate();
    		if (!mThreadRunning) {
    			mCount = 0;
    			mLastBatteryIntent = null;
    			mQuitThread = false;
    	        Thread thr = new Thread(null, mTaskRunnable, "BatteryService");
    	        thr.start();
    			registerReceiver(mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
    	        Toast.makeText(this, "Battery Service started", Toast.LENGTH_SHORT).show();
    		}
        }
    	
    	@Override
    	public void onDestroy() {
        	Log.i(TAG, "onDestroy");
            mQuitThread = true;
            notifyService();
            
        	super.onDestroy();
        	unregisterReceiver(mBatInfoReceiver);
            Toast.makeText(this, "Battery Service stopped", Toast.LENGTH_SHORT).show();
    	}
    
    	@Override
    	public IBinder onBind(Intent intent) {
    		return null;
    	}
    
    	private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
    		@Override
    		public void onReceive(Context ctx, Intent intent) {
    			try {
                	mCount += 1;
    				mLastBatteryIntent = (Intent) intent.clone();
    				notifyService();
    			}
    			catch (Exception e) {
    				Log.e(TAG,e.getMessage(), e);
    			}
    		}
    
    	};
    
    	private void logBattery(Intent batteryChangeIntent) {
    		if (batteryChangeIntent == null)
    			return;
    		try {
    			FileWriter out = null;
    			if (mBatteryLogFile != null) {
    				try {
    					out = new FileWriter(mBatteryLogFile, true);
    				}
    				catch (Exception e) {}
    			}
    			if (out == null) {
    				File root = FileUtils.getLogFilePath();//  Environment.getExternalStorageDirectory();
    				if (root == null)
    					throw new Exception("external storage dir not found");
    				mBatteryLogFile = new File(root, MyBatteryService.LOGFILEPATH);
    				boolean fileExists = mBatteryLogFile.exists();
    				if (!fileExists) {
    					mBatteryLogFile.getParentFile().mkdirs();
    					mBatteryLogFile.createNewFile();
    				}
    				if (!mBatteryLogFile.exists()) 
    					throw new Exception("creation of file '"+mBatteryLogFile.toString()+"' failed");
    				if (!mBatteryLogFile.canWrite()) 
    					throw new Exception("file '"+mBatteryLogFile.toString()+"' is not writable");
    				out = new FileWriter(mBatteryLogFile, true);
    				if (!fileExists) {
    					String header = createHeadLine();
    					out.write(header);
    					out.write("\n");
    				}
    			}
    			if (mLastBatteryIntent != null) {
    				String extras = createBatteryInfoLine(mLastBatteryIntent);
    				out.write(extras);
    				out.write("\n");
    			}
    			out.flush();
    			out.close();
    		} catch (Exception e) {
    			Log.e(TAG,e.getMessage(),e);
    		}
    	}
    
        private String createHeadLine() {
        	StringBuffer result = new StringBuffer();
        	result.append("Nr;TimeMillis");
        	for (String key : batteryExtraKeys)
    			result.append(";").append(key);
    		return result.toString();
    	}
    
    	private String createBatteryInfoLine(Intent batteryIntent) {
        	StringBuffer result = new StringBuffer();
        	result.append(Integer.toString(mCount)).append(";").append(Long.toString(System.currentTimeMillis()));
        	Bundle extras = batteryIntent.getExtras();
        	for (String key : batteryExtraKeys)
    			result.append(";").append(extras.get(key));
    		return result.toString();
    	}
    
        Runnable mTaskRunnable = new Runnable() {
    		public void run() {
                mThreadRunning = true;
                Log.i(TAG,"STARTING BATTERYSERVICE TASK");
                while (!mQuitThread) {
    				Log.i(TAG,"STARTING BATTERYSERVICE TASK begin logfile");
    				logBattery(mLastBatteryIntent);
                    synchronized (MyBatteryService.this) {
                    	try {
                        	MyBatteryService.this.wait();
                    	} catch (Exception ignore) {}
                    }
                }
                mThreadRunning = false;
    			logBattery(mLastBatteryIntent);
                Log.i(TAG,"LEAVING BATTERYSERVICE TASK");
            }
        };
    	
    	public void notifyService() {
    		synchronized (MyBatteryService.this) {
    			MyBatteryService.this.notifyAll();
    		}
    	}
    }

说明：

> 1. 定义MyBatteryService类，用于在后台进行电量属性的获取；
> 
> 1. 在MyBatteryService中，注册BroadcastReceiver：
> 
>     registerReceiver(mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
> 
> 2. mBatInfoReceiver是一个BroadcastReceiver， mLastBatteryIntent保存了接收到的数据；
> 
> 3. mTaskRunnable是工作线程，通过logBattery(mLastBatteryIntent);将接收到的数据写入文件；

写入的文件内容，大概如下：

> Nr;TimeMillis;level;scale;voltage;temperature;plugged;status;health;present;technology;icon-small
> 
> 1;1650438867518;72;100;3983;364;2;2;2;true;Li-ion;17303668
> 
> 2;1650438876180;72;100;4003;363;2;2;2;true;Li-ion;17303668
> 
> 3;1650438886226;72;100;4000;364;2;2;2;true;Li-ion;17303668
> 
> 4;1650438896285;72;100;4011;365;2;2;2;true;Li-ion;17303668
> 
> 5;1650438906325;72;100;3996;365;2;2;2;true;Li-ion;17303668
> 
> 6;1650438916364;72;100;4028;364;2;2;2;true;Li-ion;17303668
> 
> 7;1650438926414;72;100;4018;365;2;2;2;true;Li-ion;17303668
> 
> 8;1650438936468;72;100;4026;365;2;2;2;true;Li-ion;17303668
> 
> 9;1650438946513;72;100;4006;365;2;2;2;true;Li-ion;17303668
> 
> 10;1650438956576;72;100;4018;365;2;2;2;true;Li-ion;17303668

另外，也可以通过系统提供的BatteryManager来实现类似的功能：

> BatteryManager batteryManager = (BatteryManager)context.getSystemService(context.BATTERY\_SERVICE);
> 
> int level = batteryManager.getIntProperty(BatteryManager.BATTERY\_PROPERTY\_CAPACITY);

项目传送门：

[Android-电池管理-实时获取电池电量，温度...等属性。-Android文档类资源-CSDN下载][Android-_-_..._-Android_-CSDN]

--------------------

[Android-_-_..._-Android_-CSDN]: https://download.csdn.net/download/liranke/85189036