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   源码介绍

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package com.android.batterywaster; 
import android.app.Activity; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.os.BatteryManager; 
import android.os.Bundle; 
import android.os.PowerManager; 
import android.view.View; 
import android.widget.CheckBox; 

import android.widget.TextView; 

 

import java.text.DateFormat; 

import java.util.Date; 

 

/** 

* So you thought sync used up your battery life. 

*/ 

public class BatteryWaster extends Activity { 

TextView mLog; 

DateFormat mDateFormat; 

IntentFilter mFilter; 

PowerManager.WakeLock mWakeLock; 

SpinThread mThread; 

 

@Override 

public void onCreate(Bundle savedInstanceState) { 

super.onCreate(savedInstanceState); 

 

// Set the layout for this activity.  You can find it 

// in res/layout/hello_activity.xml 

setContentView(R.layout.main); 

 

findViewById(R.id.checkbox).setOnClickListener(mClickListener); 

mLog = (TextView)findViewById(R.id.log); 

 

mDateFormat = DateFormat.getInstance(); 

 

mFilter = new IntentFilter(); 

mFilter.addAction(Intent.ACTION_BATTERY_CHANGED); 

mFilter.addAction(Intent.ACTION_BATTERY_LOW); 

mFilter.addAction(Intent.ACTION_BATTERY_OKAY); 

mFilter.addAction(Intent.ACTION_POWER_CONNECTED); 

 

PowerManager pm = (PowerManager)getSystemService(POWER_SERVICE); 

mWakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "BatteryWaster"); 

mWakeLock.setReferenceCounted(false); 

} 

 

@Override 

public void onPause() { 

stopRunning(); 

} 

 

View.OnClickListener mClickListener = new View.OnClickListener() { 

public void onClick(View v) { 

CheckBox checkbox = (CheckBox)v; 

if (checkbox.isChecked()) { 

startRunning(); 

} else { 

stopRunning(); 

} 

} 

}; 

 

void startRunning() { 

log("Start"); 

registerReceiver(mReceiver, mFilter); 

mWakeLock.acquire(); 

if (mThread == null) { 

mThread = new SpinThread(); 

mThread.start(); 

} 

} 

 

void stopRunning() { 

log("Stop"); 

unregisterReceiver(mReceiver); 

mWakeLock.release(); 

if (mThread != null) { 

mThread.quit(); 

mThread = null; 

} 

} 

 

void log(String s) { 

mLog.setText(mLog.getText()   "\n"   mDateFormat.format(new Date())   ": "   s); 

} 

 

BroadcastReceiver mReceiver = new BroadcastReceiver() { 

public void onReceive(Context context, Intent intent) { 

String action = intent.getAction(); 

String title = action; 

int index = title.lastIndexOf('.'); 

if (index >= 0) { 

title = title.substring(index   1); 

} 

if (Intent.ACTION_BATTERY_CHANGED.equals(action)) { 

int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); 

int icon = intent.getIntExtra(BatteryManager.EXTRA_ICON_SMALL,-1); 

log(title   ": level="   level   "\n"   "icon:"   icon); 

} else { 

log(title); 

} 

} 

}; 

 

class SpinThread extends Thread { 

private boolean mStop; 

 

public void quit() { 

synchronized (this) { 

mStop = true; 

} 

} 

 

public void run() { 

while (true) { 

synchronized (this) { 

if (mStop) { 

return; 

} 

} 

} 

} 

} 

}