获取cpu使用率和内存使用情况

package com.guo; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.FileReader; import java.io.IOException; import java.io.InputStreamReader; import android.app.ActivityManager; import android.app.ActivityManager.MemoryInfo; import android.content.Context; import android.text.format.Formatter; import android.util.Log; import android.view.Window; import android.widget.TextView; public class ReadSystemMemory extends Activity { public static final int REFRESH = 0x000001; public TextView tv = null; long total = 0; long idle = 0; double usage = 0; public void CPULoad( ) { readUsage( ); } public void readUsage( ) { try { BufferedReader reader = new BufferedReader( new InputStreamReader( new FileInputStream( "/proc/stat" ) ), 1000 ); String load = reader.readLine(); reader.close(); String[] toks = load.split(" "); long currTotal = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4]); long currIdle = Long.parseLong(toks[5]); this.usage =(currTotal - total) * 100.0f / (currTotal - total + currIdle - idle); this.total = currTotal; this.idle = currIdle; } catch( IOException ex ) { ex.printStackTrace(); } } public Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { tv = (TextView) findViewById(R.id.system_memory); if (msg.what == ReadSystemMemory.REFRESH) { if(tv!=null) tv.setText("mTotle: " + this.getTotalMemory() + ", " + "midle: " + this.getAvailMemory()+","+"cusage:"+ Math.round(this.getUsage())+"%"); } } public double getUsage( ) { readUsage( ); return usage; } public String getAvailMemory() { ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); MemoryInfo mi = new MemoryInfo(); am.getMemoryInfo(mi); //mi.availMem; 当前系统的可用内存 return Formatter.formatFileSize(getBaseContext(), mi.availMem);// 将获取的内存大小规格化 } public String getTotalMemory() { String str1 = "/proc/meminfo";// 系统内存信息文件 String str2; String[] arrayOfString; long initial_memory = 0; try { FileReader localFileReader = new FileReader(str1); BufferedReader localBufferedReader = new BufferedReader( localFileReader, 8192); str2 = localBufferedReader.readLine();// 读取meminfo第一行，系统总内存大小 arrayOfString = str2.split("\\s+"); for (String num : arrayOfString) { Log.i(str2, num + "\t"); } initial_memory = Integer.valueOf(arrayOfString[1]).intValue() * 1024;// 获得系统总内存，单位是KB，乘以1024转换为Byte localBufferedReader.close(); } catch (IOException e) { } return Formatter.formatFileSize(getBaseContext(), initial_memory);// Byte转换为KB或者MB，内存大小规格化 } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); setContentView(R.layout.main); getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.main); tv = (TextView) findViewById(R.id.system_memory); new MyThread().start(); } public class MyThread extends Thread { public void run() { while (true) { Message msg = new Message(); msg.what = REFRESH; msg.obj = this; mHandler.sendMessage(msg); try { Thread.sleep(1000); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } } } } }