Android 电量监控、关机、重启功能的实现

本文主要是介绍Android电量监控、关机、重启功能的实现，需要具备的条件是手机需要root过，才能实现相关操作。

1.MainActivity.java

import java.io.IOException;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends  Activity {
	private String TAG="MainActivity";
	private Button startBtn;
	private Button stopBtn;
	private Button rebootBtn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent intent = new Intent(MainActivity.this,BatteryCheckService.class);
        startService(intent);//开启服务
        Log.d(TAG,"开启服务");
        
        //初始化控件
        rebootBtn= (Button) findViewById(R.id.reboot);
        startBtn =(Button)findViewById(R.id.start);
		stopBtn =(Button)findViewById(R.id.stop);
		
		//开始启动电量监控
		startBtn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent = new Intent(MainActivity.this,BatteryCheckService.class);
				startService(intent);
			}
		});
		//停止电量监控
		stopBtn.setOnClickListener(new OnClickListener() {
				
				@Override
				public void onClick(View v) {
					// TODO Auto-generated method stub
					Intent intent = new Intent(MainActivity.this,BatteryCheckService.class);
					stopService(intent);
				}
			});
	//重启机器
	rebootBtn.setOnClickListener(new OnClickListener() {
		
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			String cmd = "su -c reboot";
            try {
                    Runtime.getRuntime().exec(cmd);
            } catch (IOException e) {
                    // TODO Auto-generated catch block
/*
                    new AlertDialog.Builder(this).setTitle("Error").setMessage(
                                    e.getMessage()).setPositiveButton("OK", null).show();*/
            }
		}
	});
    }

}

2.BatteryCheckService.java

import java.io.DataOutputStream;
import java.io.IOException;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.widget.Toast;

public class BatteryCheckService extends Service {
	 /* 变量声明 */
	  private int intLevel;
	  private int intScale; 
	  /* create BroadcastReceiver */
	  private BroadcastReceiver mBatInfoReceiver=new BroadcastReceiver()
	  {  
	    public void onReceive(Context context, Intent intent) 
	    { 
	      String action = intent.getAction();  
	      /* 如果捕捉到的action是ACTION_BATTERY_CHANGED，
	       * 就执行onBatteryInfoReceiver() */
	      if (Intent.ACTION_BATTERY_CHANGED.equals(action)) 
	      { 
	        intLevel = intent.getIntExtra("level", 0);  
	        intScale = intent.getIntExtra("scale", 100); 
	        onBatteryInfoReceiver(intLevel,intScale);
	      }  
	    } 
	  };
	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}
	@Override
	public int  onStartCommand(Intent intent,int flags,int startId){
		 //  setContentView(R.layout.activity_main);
        /* 注册几个系统 BroadcastReceiver，作为访问电池计量之用 */ 
        registerReceiver  (mBatInfoReceiver, 
        		new IntentFilter(Intent.ACTION_BATTERY_CHANGED)  );
       
		return  super.onStartCommand(intent,flags,startId);
		
	}
	
	  /* 拦截到ACTION_BATTERY_CHANGED时要执行的method */
    public void onBatteryInfoReceiver(int intLevel, int intScale) 
    {
    	// 如果当前电量小于总电量的10%
    			if (intLevel* 1.0 /intScale < 0.10)
    			{
    				Toast.makeText(getApplicationContext(), "当前手机电量剩余"+String.valueOf(intLevel * 100 / intScale) + "%"+"，电量过低，请尽快充电！"
    						, Toast.LENGTH_LONG).show();
    				shutdown() ;
    			}else{
    				Toast.makeText(getApplicationContext(), "当前手机电量剩余"+String.valueOf(intLevel * 100 / intScale) + "%"+"电量正常，可以正常使用！"
    						, Toast.LENGTH_LONG).show();
    			}
    }
    
    //关机
    private void shutdown() {  
        try {  
            Process process = Runtime.getRuntime().exec("su");  
            DataOutputStream out = new DataOutputStream(  
                    process.getOutputStream());  
            out.writeBytes("reboot -p\n");  
            out.writeBytes("exit\n");  
            out.flush();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
    
    @Override  
    public void onDestroy() {//重写onDestroy方法  
        this.unregisterReceiver(mBatInfoReceiver);//取消注册的CommandReceiver  
        super.onDestroy();  
    }    
}

3.布局文件activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="60dip"
        android:textStyle="bold"
        android:textSize="24dip"
        android:text="电量监控" 
        android:layout_gravity="center"/>
    
    <LinearLayout 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dip"
        android:layout_gravity="center">
    <Button
        android:id="@+id/start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开始"/>

     <Button
        android:id="@+id/stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="停止"/>
     
     <Button
        android:id="@+id/reboot"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="重启"/>
     
     </LinearLayout>
     
</LinearLayout>

4.配置文件AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.batterycheckserver"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />
    
 	<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
 	
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        
   <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>  
        
        <service 
            android:name=".BatteryCheckService">
	</service>
        <!--  <receiver android:name=".BootReceiver">        
　　        <intent-filter>
　　             <action android:name="android.intent.action.BOOT_COMPLETED"/>
     				<category android:name="android.intent.category.LAUNCHER" />    
　　        </intent-filter>
　　        </receiver>  -->
    </application>

</manifest>