从普通类获取Ram和设备信息，android

Question

这是主要的活动，我从中调用类S（从中获取设备信息和ram

public class MainActivity extends Activity 
{
@Override
protected void onCreate(Bundle savedInstanceState) 
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView  txt=(TextView) findViewById(R.id.txt);
S s= new S();
long value=s.mem();
txt.setText("sa"+value);
}
}
public class S extends Service
{
public long mem()
{
long value=0;
int id = android.os.Process.myPid();
ActivityManager activityManager=(ActivityManager)getSystemService(ACTIVITY_SERVICE);
MemoryInfo outInfo=activityManager.getProcessMemoryInfo(new int[]{id})[0]; 
value=outInfo.getTotalPrivateDirty();
String manufacturer = Build.MANUFACTURER;
String brand        = Build.BRAND;
String product      = Build.PRODUCT;
String model        = Build.MODEL;
String a = getResources().getString(R.string.app_name);
return value+manufacturer+brand+product+model+applicationName;
 }
@Override
public IBinder onBind(Intent intent)
 {
// TODO Auto-generated method stub
return new ServiceReaderDataBinder();
}
class ServiceReaderDataBinder extends Binder 
{
S getService(){ return S.this;}
}
}

Answer 1

您正在创建一个服务实例，但实际上您应该绑定该服务。修改你的活动，如下

@Override
protected void onCreate(Bundle savedInstanceState) 
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent=new Intent(this, s.class);
        bindService(intent, conn, BIND_AUTO_CREATE);
 }
 public ServiceConnection  conn=new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
    // TODO Auto-generated method stub
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
    // TODO Auto-generated method stub
    ServiceReaderDataBinder binder=(ServiceReaderDataBinder )service;
    s=binder.getService();
    ((TextView)findViewById(R.id.txt)).setText(s.mem());
}
};

注意：不要忘记在menifest文件