获取Android手机内测CPU等信息
出于毕设客户端的开发需要，想要收集Android设备的内存、CPU、存储和电量信息，通过查找现在这四个信息的获取代码如下：
电量信息
通过广播实现，系统在电池电量信息发送变化时，回向外发送广播。只要注册一个监听Intent.ACTION_BATTERY_CHANGED的广播接收器并声明权限即可。1
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18public void batteryLevel() {
BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {
int scale = -1;
int level = -1;
int voltage = -1;
int temperature = -1;
@Override
public void onReceive(Context context, Intent intent) {
level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
temperature = intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, -1);
voltage = intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE, -1);
Log.i("BatteryManager", "level is "+level+"/"+scale+", temp is "+ temperature +", voltage is "+voltage);
}
};
IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
MyApplication.getContext().registerReceiver(batteryLevelReceiver, filter);
}
这里要注意的是在广播接收器BroadcastReceiver的onReceiver方法中的语句只会在接受到系统广播之后才能得到执行，若果刚刚注册这个广播监听器接着就是获取系统电量，那么一定会遇到得到的电量为0等问题，可以参见stackoverflow上这个问题。解决方法应该是先注册广播接收器，一段时间后在获取电量信息。
CPU使用率
主要是借助top命令，这里我只需要用户的cup使用率和系统cup使用率两个参数即可，所以只需输出的第一行如下User 7%, System 8%, IOW 0%, IRQ 0%
实现的代码如下：1
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33public void CpuUsage() throws Exception{
String topresult;
Process process = Runtime.getRuntime().exec("top -n 1");
BufferedReader br=new BufferedReader(new InputStreamReader(process.getInputStream()));
while((topresult = br.readLine())!=null)
{
if(topresult.trim().length()<1){
continue;
}else{
Log.i("CpuUsage", topresult);
String[] cpuInfoStrings = topresult.split(",");
cpuInfo = new HashMap<String,Integer>();
cpuInfo.put("Users",findNumInString(cpuInfoStrings[0]));
cpuInfo.put("sys", findNumInString(cpuInfoStrings[1]));
break;
}
}
}
private int findNumInString(String cpuInfoString){
int percent;
Pattern pattern = Pattern.compile("\\w*\\s(\\d*)\\%");
Matcher matcher = pattern.matcher(cpuInfoString);
if (matcher.find()) {
String temp = matcher.group(1);
percent = Integer.parseInt(temp);
}
else {
percent = -1;
}
return percent;
}
存储信息
存储信息分为SD卡和系统自身的，手机自身除了系统之外的存储空间被称为ExternalStorage，这里要注意这不是值自己的插入的TF卡
SD卡信息
下面是获取SD卡存储空间的代码，主要是获取块数量和每块的大小1
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18public void SDCardSize() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
File sdcardDir = Environment.getExternalStorageDirectory();
StatFs sf = new StatFs(sdcardDir.getPath());
long blockSize = sf.getBlockSize();
long blockCount = sf.getBlockCount();
long availCount = sf.getAvailableBlocks();
Log.d("" , "block大小:" + blockSize+ ",block数目:" + blockCount+ ",总大小:" +blockSize*blockCount/ 1024 /1024+ "MB" );
totalSizeInSd = blockSize*blockCount/ 1024 /1024;
Log.d("" , "可用的block数目：:" + availCount+ ",剩余空间:" + availCount*blockSize/ 1024 /1024+ "MB" );
usefulSizeInSd = availCount*blockSize/ 1024 / 1024;
}
else {
totalSizeInSd = 0L;
usefulSizeInSd = 0L;
}
}
内部存储信息
原理很SD卡一样，都是根据块数量和每块的大小1
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11public void internalStorageSize(){
File root = Environment.getRootDirectory();
StatFs sf = new StatFs(root.getPath());
long blockSize = sf.getBlockSize();
long blockCount = sf.getBlockCount();
long availCount = sf.getAvailableBlocks();
Log.d("", "block大小:"+ blockSize+",block数目:"+ blockCount+",总大小:"+blockSize*blockCount/1024+"MB");
totalSizeInternal = blockSize*blockCount/1024/1024;
Log.d("", "可用的block数目：:"+ availCount+",可用大小:"+ availCount*blockSize/1024+"MB");
usefulSizeInternal = availCount*blockSize/1024/1024;
}
内存信息
内存主要是通过获取系统活动管理器对象（ActivityManager）和ActivityManager.MemoryInfo对象，调用ActivityManager对象的getMemoryInfo方法，将Android内存信息保存在在ActivityManager.MemoryInfo对象对象中1
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10public void memoryInfo(){
//获得MemoryInfo对象
ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();
//获取系统服务信息
ActivityManager myActivityManager = (ActivityManager)MyApplication.getContext().getSystemService(Activity.ACTIVITY_SERVICE);
//获得系统可用内存，保存在MemoryInfo对象上
myActivityManager.getMemoryInfo(memoryInfo);
usefulMemorySize = memoryInfo.availMem / 1024 /1024;
//totalMemorySize = memoryInfo.totalMem;
}
这里的一个小问题是，memoryInfo.totalMem添加之后，Eclipse并没有在该语句周围报错，但却在整个.java文件中报错。查询andriod API发现totalMen成员变量是在API 16之后加入的，但是我这里target API也是大于16的。
