Android软件开发

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一、内存（ram）： 

android的总内存大小信息存放在系统的/proc/meminfo文件里面，可以通过读取这个文件来获取这些信息： 

运行信息如下：

第一行是总内存大小(即用户可以使用的ram的大小)！其他各项的介绍大家可以看这儿： 
http://bg135.com/android-phones-to-get-the-total-memory-and-available-memory.html 

获取当前剩余内存(ram)大小的方法： 

二、Rom大小 ：

注意类型，不然相乘之后会有溢出。可用内部存储的大小不能通过getRootDirectory(); 
取得，之前网上传的很多都是用getRootDirectory()取得的，我测试之后发现取得的数值不对。要根据getDataDirectory(); 
取得。 

三、sdCard大小 ：
public long[] getSDCardMemory() {
long[] sdCardInfo=new long[2];
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
File sdcardDir = Environment.getExternalStorageDirectory();
StatFs sf = new StatFs(sdcardDir.getPath());
long bSize = sf.getBlockSize();
long bCount = sf.getBlockCount();
long availBlocks = sf.getAvailableBlocks();

sdCardInfo[0] = bSize * bCount;//总大小
sdCardInfo[1] = bSize * availBlocks;//可用大小
}
return sdCardInfo;
}

注意类型，不然相乘之后会有溢出。

四、电池电量：

private BroadcastReceiver batteryReceiver=new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
int level = intent.getIntExtra("level", 0);
// level加%就是当前电量了
}
};
然后在activity的oncreate()方法中注册

registerReceiver(batteryReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); 
五、CPU信息：
public String[] getCpuInfo() {
String str1 = "/proc/cpuinfo";
String str2="";
String[] cpuInfo={"",""};
String[] arrayOfString;
try {
FileReader fr = new FileReader(str1);
BufferedReader localBufferedReader = new BufferedReader(fr, 8192);
str2 = localBufferedReader.readLine();
arrayOfString = str2.split("\\s+");
for (int i = 2; i < arrayOfString.length; i++) {
cpuInfo[0] = cpuInfo[0] + arrayOfString[i] + " ";
}
str2 = localBufferedReader.readLine();
arrayOfString = str2.split("\\s+");
cpuInfo[1] += arrayOfString[2];
localBufferedReader.close();
} catch (IOException e) {
}
return cpuInfo;
}

/proc/cpuinfo文件中第一行是CPU的型号，第二行是CPU的频率，可以通过读文件，读取这些数据！

六、系统的版本信息

public String[] getVersion(){
String[] version={"null","null","null","null"};
String str1 = "/proc/version";
String str2;
String[] arrayOfString;

try {
FileReader localFileReader = new FileReader(str1);
BufferedReader localBufferedReader = new BufferedReader(
localFileReader, 8192);
str2 = localBufferedReader.readLine();

arrayOfString = str2.split("//s+");
version[0]=arrayOfString[2];//KernelVersion
localBufferedReader.close();
} catch (IOException e) {
}

version[1] = Build.VERSION.RELEASE; //firmware version

 

version[3]=Build.DISPLAY;//system version
return version;
}
 

版本信息里面还包括型号等信息。

七、MAC地址和开机时间：
public String[] getOtherInfo(){
String[] other={"null","null"};
        WifiManager wifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        if(wifiInfo.getMacAddress()!=null){
         other[0]=wifiInfo.getMacAddress();
} else {
other[0] = "Fail";
}
other[1] = getTimes();
        return other;
}
private String getTimes() {
long ut = SystemClock.elapsedRealtime() / 1000;
if (ut == 0) {
ut = 1;
}
int m = (int) ((ut / 60) % 60);
int h = (int) ((ut / 3600));
return h + " " + mContext.getString(R.string.info_times_hour) + m + " "
+ mContext.getString(R.string.info_times_minute);
}

 

最后贴一个格式化数据的方法：
public String formatSize(long size) {
String suffix = null;
float fSize=0;

if (size >= 1024) {
suffix = "KB";
fSize=size / 1024;
if (fSize >= 1024) {
suffix = "MB";
fSize /= 1024;
}
if (fSize >= 1024) {
suffix = "GB";
fSize /= 1024;
}
} else {
fSize = size;
}
java.text.DecimalFormat df = new java.text.DecimalFormat("#0.00");
StringBuilder resultBuffer = new StringBuilder(df.format(fSize));
if (suffix != null)
resultBuffer.append(suffix);
return resultBuffer.toString();
}
保留两位小数。