Android CUP使用率源码

import java.io.IOException;
import java.io.RandomAccessFile;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class TextActivity extends Activity {

private TextView mytext;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mytext = (TextView)findViewById(R.id.text);     
   
        String sysv = "您手机的CPU使用率为："+readUsage();  
        mytext.setText(sysv); 
    }
      
    
private float readUsage() { 
    
try { RandomAccessFile reader = new RandomAccessFile("/proc/stat", "r");
    
       String load = reader.readLine(); 
    
       String[] toks = load.split(" "); 
    
       long idle1 = Long.parseLong(toks[5]); 
    
       long cpu1 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4]) + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]); 
    
try { 
     Thread.sleep(360); 
    
} catch (Exception e) {} 
    
    reader.seek(0); 
    
    load = reader.readLine(); 
    
    reader.close(); 
    
    toks = load.split(" "); 
    
    long idle2 = Long.parseLong(toks[5]); 
    
    long cpu2 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4]) + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]); 
    
    return (int)(100*(cpu2 - cpu1) / ((cpu2 + idle2) - (cpu1 + idle1))); 
    
} catch (IOException ex) { ex.printStackTrace();
    
} 
    
return 0; } 
    
}