Android获取cpu使用率,剩余内存和硬盘容量

1.内存信息

       在proc/meminfo下有详细的内存使用情况,我这里获取的内存信息就是从这个文件里获取的.获取到详细的内存信息后根据我自己的需求,从bufferdreader中单独抽取出来了剩余的内存容量.

<span style="font-family:Microsoft YaHei;font-size:14px;">		Runtime runtime = Runtime.getRuntime();
		Process p;
		try {
			p = runtime.exec(CMD_MEM);
		} catch (IOException e) {	
			Log.e("CameraActivity", "run cmd("+CMD_MEM+") failed:" + e.getMessage());
			return null;
		}
		InputStreamReader reader = new InputStreamReader(p.getInputStream());
        BufferedReader buf = new BufferedReader(reader);</span>

2.磁盘信息

       使用Android.os下的StatFs来获取文件系统状态和一些磁盘信息.

<span style="font-family:Microsoft YaHei;font-size:14px;">		File root = Environment.getRootDirectory();
		StatFs sf = new StatFs(root.getPath());
		long blockSize = sf.getBlockSize();
		long availCount = sf.getAvailableBlocks();
		return (availCount * blockSize) / 1024 / 1024 + "MB";</span>

3.CPU使用率,和当前进程的CPU占有率

        3.1 CPU总使用率

        在proc/stat下有详细的CPU使用情况.详细格式如下:

CPU 152342 1421 28562 1600830 12389 553 273 0 0 

        CPU后面的几位数字分别是

                 当前进行所占CPU的算法是:100*(processCpuTimeS-processCpuTimeF)/(totalCpuTimeS-totalCpuTimeF)

<span style="font-family:Microsoft YaHei;font-size:14px;">		String[] cpuInfos = null;
		try{
			BufferedReader reader = new BufferedReader(new InputStreamReader(
	                   new FileInputStream("/proc/stat")), 1000);
	        String load = reader.readLine();
	        reader.close();
	        cpuInfos = load.split(" ");
		}catch(IOException ex){
			Log.e(TAG, "IOException" + ex.toString());
			return 0;
		}
		long totalCpu = 0;
		try{
		    totalCpu = Long.parseLong(cpuInfos[2])
		               + Long.parseLong(cpuInfos[3]) + Long.parseLong(cpuInfos[4])
		               + Long.parseLong(cpuInfos[6]) + Long.parseLong(cpuInfos[5])
		               + Long.parseLong(cpuInfos[7]) + Long.parseLong(cpuInfos[8]);
		}catch(ArrayIndexOutOfBoundsException e){
			Log.i(TAG, "ArrayIndexOutOfBoundsException" + e.toString());
			return 0;
		}</span>

<span style="font-family:Microsoft YaHei;font-size:14px;">		String[] cpuInfos = null;
		try{
			int pid = android.os.Process.myPid();
			BufferedReader reader = new BufferedReader(new InputStreamReader(
	                   new FileInputStream("/proc/" + pid + "/stat")), 1000);
	        String load = reader.readLine();
	        reader.close();
	        cpuInfos = load.split(" ");
		}catch(IOException e){
			Log.e(TAG, "IOException" + e.toString());
			return 0;
		}
		long appCpuTime = 0;
		try{
		    appCpuTime = Long.parseLong(cpuInfos[13])
		               + Long.parseLong(cpuInfos[14]) + Long.parseLong(cpuInfos[15])
		               + Long.parseLong(cpuInfos[16]);
		}catch(ArrayIndexOutOfBoundsException e){
			Log.i(TAG, "ArrayIndexOutOfBoundsException" + e.toString());
			return 0;
		}</span>