Android 获取内存信息

<p></p>
<p>
import java.io.BufferedReader;
import java.io.FileReader;</p>
<p>import android.app.Activity;
import android.app.ActivityManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TextView;</p>
<p>public class SystemInfo extends Activity {
 
private TextView textView,textView2;
ActivityManager am;
ActivityManager.MemoryInfo memoryInfo;
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.sysinfo);
 textView=(TextView) findViewById(R.id.sys_textView1);
 textView2=(TextView) findViewById(R.id.sys_textView2);
 am=(ActivityManager) getSystemService(ACTIVITY_SERVICE);
 memoryInfo=new ActivityManager.MemoryInfo();
 am.getMemoryInfo(memoryInfo); 
 textView2.setText("本机最大内存："+GetTotalMemory()+"M");
 UpdateMemory Update=new UpdateMemory();
 Update.start();
 }
 class UpdateMemory extends Thread{
public void run() {
while(true){
 Message message=new Message();
 //message.obj=GetAvailableMemory(memoryInfo.availMem);
 message.what=1;
 handler.sendMessage(message);
 try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}
 
 }
 
 Handler handler=new Handler(){</p>
<p>public void handleMessage(Message msg) {
// TODO Auto-generated method stub
if (msg.what==1) {
 textView.setText("本机还有内存:"+GetAvailableMemory(memoryInfo.availMem)+"M");
}

super.handleMessage(msg);
}
 
 };
 
 private Double GetTotalMemory(){
 
 String str1 = "/proc/meminfo";
 String str2; 
 Double memory=0.0 ;
 try {
FileReader r=new FileReader(str1);
BufferedReader bufferedRead=new BufferedReader(r, 8192);
str2=bufferedRead.readLine();
System.err.println("str2--------->"+str2);
//arrayOfString = str2.split("//s+"); 
///String str3=str2.trim();
//System.out.println("----------------------->"+str3);

 String str4=str2.substring(str2.length()-9, str2.length()-3);
//System.out.println(str4+" "+str4.length());
memory=Double.parseDouble(str4)/1000;

} catch (Exception e) {
// TODO: handle exception
}
return memory;
 }
 private double GetAvailableMemory(long num)
 {
 double M;
 M=(num/1024)/1024;
 
 return M;
 }
}</p>