service renvoie une exception de pointeur nul

Question

J'ai créé un service pour obtenir des données du/proc/meminfo et la classe de service est:

import java.io.BufferedReader; 
import java.io.FileReader; 
import java.util.Vector; 

import android.app.Service; 
import android.content.Intent; 
import android.os.Binder; 
import android.os.IBinder; 

public class MonitorService extends Service{ 

Vector<String> memFree, buffers, cached, active, inactive, swapTotal,dirty; 
int TOTAL_INTERVALS = 440; 
private BufferedReader readStream; 
private String x; 
int memTotal; 

private Runnable readRunnable = new Runnable() { 
    public void run() { 
     read(); // We call here read() because to draw the graphic we need 
       // at less 2 read values. 
     while (readThread == Thread.currentThread()) { 
      try { 
       read(); 
       Thread.sleep(1000); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 
    } 
}; 

private Thread readThread = new Thread(readRunnable, "readThread"); 

class MyServiceDataBinder extends Binder { 
    MonitorService getService() { 
     return MonitorService.this; 
    } 
} 

@Override 
public void onCreate() { 
    // TODO Auto-generated method stub 
    memFree = new Vector<String>(this.TOTAL_INTERVALS); 
    buffers = new Vector<String>(this.TOTAL_INTERVALS); 
    cached = new Vector<String>(this.TOTAL_INTERVALS); 
    active = new Vector<String>(this.TOTAL_INTERVALS); 
    inactive = new Vector<String>(this.TOTAL_INTERVALS); 
    swapTotal = new Vector<String>(this.TOTAL_INTERVALS); 
    dirty = new Vector<String>(this.TOTAL_INTERVALS); 

} 

@Override 
public IBinder onBind(Intent intent) { 
    // TODO Auto-generated method stub 
    return new MyServiceDataBinder(); 
} 

private void read() { 
    try { 
     readStream = new BufferedReader(new FileReader("/proc/meminfo")); 
     x = readStream.readLine(); 
     while (x != null) { 

      /* 
      * When the limit TOTAL_INTERVALS is surpassed by some vector we 
      * have to remove all the surpassed elements because, if not, 
      * the capacity of the vector will be increase x2. 
      */ 
      while (memFree.size() >= this.TOTAL_INTERVALS) 
       memFree.remove(memFree.size() - 1); 
      while (buffers.size() >= this.TOTAL_INTERVALS) 
       buffers.remove(buffers.size() - 1); 
      while (cached.size() >= this.TOTAL_INTERVALS) 
       cached.remove(cached.size() - 1); 
      while (active.size() >= this.TOTAL_INTERVALS) 
       active.remove(active.size() - 1); 
      while (inactive.size() >= this.TOTAL_INTERVALS) 
       inactive.remove(inactive.size() - 1); 
      while (swapTotal.size() >= this.TOTAL_INTERVALS) 
       swapTotal.remove(swapTotal.size() - 1); 
      while (dirty.size() >= this.TOTAL_INTERVALS) 
       dirty.remove(dirty.size() - 1); 

      // We read the memory values. The percents are calculated in the 
      // AnotherMonitor class. 
      if (x.startsWith("MemTotal:")) 
       memTotal = Integer.parseInt(x.split("[ ]+", 3)[1]); 
      if (x.startsWith("MemFree:")) 
       memFree.add(0, x.split("[ ]+", 3)[1]); 
      if (x.startsWith("Buffers:")) 
       buffers.add(0, x.split("[ ]+", 3)[1]); 
      if (x.startsWith("Cached:")) 
       cached.add(0, x.split("[ ]+", 3)[1]); 
      if (x.startsWith("Active:")) 
       active.add(0, x.split("[ ]+", 3)[1]); 
      if (x.startsWith("Inactive:")) 
       inactive.add(0, x.split("[ ]+", 3)[1]); 
      if (x.startsWith("SwapTotal:")) 
       swapTotal.add(0, x.split("[ ]+", 3)[1]); 
      if (x.startsWith("Dirty:")) 
       dirty.add(0, x.split("[ ]+", 3)[1]); 
      x = readStream.readLine(); 
     } 

     readStream.close(); 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

} 

La classe où j'appelle le service créé:

import java.text.DecimalFormat; 
import java.util.Vector; 

import android.app.Activity; 
import android.content.ComponentName; 
import android.content.Intent; 
import android.content.ServiceConnection; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.IBinder; 
import android.widget.TextView; 

import com.sliit.droidman.R; 

public class Processor extends Activity{ 

private TextView ram1, ram2, ram3, ram4, ram5, ram6, ram7; 
private MonitorService MyMonitor; 
private DecimalFormat myFormat = new DecimalFormat("##,###,##0"); 
private Handler myHandler; 

private Runnable drawRunnable = new Runnable() { 
    public void run() { 
     setTextLabel(ram1,MyMonitor.memFree); 
     setTextLabel(ram2,MyMonitor.buffers); 
     setTextLabel(ram3,MyMonitor.cached); 
     setTextLabel(ram4,MyMonitor.active); 
     setTextLabel(ram5,MyMonitor.inactive); 
     setTextLabel(ram6,MyMonitor.swapTotal); 
     setTextLabel(ram7,MyMonitor.dirty); 

     myHandler.postDelayed(this, 1000); 
    } 
}; 

private ServiceConnection MyService = new ServiceConnection() { 

    public void onServiceDisconnected(ComponentName name) { 
     // TODO Auto-generated method stub 
     MyMonitor = null; 
    } 

    public void onServiceConnected(ComponentName name, IBinder service) { 
     // TODO Auto-generated method stub 
     MyMonitor = ((MonitorService.MyServiceDataBinder)service).getService(); 
     ram1.setText(myFormat.format(MyMonitor.memTotal) + " kB"); 
     myHandler.post(drawRunnable); <--- A null pointer Exceprtion occurs 
    } 
}; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    startService(new Intent(this, MonitorService.class)); 
    setContentView(R.layout.resources_processor); 

    ram1 = (TextView) findViewById(R.id.Appres_ProcessorInfo1); 
    ram2 = (TextView) findViewById(R.id.Appres_ProcessorInfo2); 
    ram3 = (TextView) findViewById(R.id.Appres_ProcessorInfo3); 
    ram4 = (TextView) findViewById(R.id.Appres_ProcessorInfo4); 
    ram5 = (TextView) findViewById(R.id.Appres_ProcessorInfo5); 
    ram6 = (TextView) findViewById(R.id.Appres_ProcessorInfo6); 
    ram7 = (TextView) findViewById(R.id.Appres_ProcessorInfo7); 
} 

@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 
    bindService(new Intent(this, MonitorService.class), MyService, 0); 
} 

@Override 
protected void onStop() { 
    // TODO Auto-generated method stub 
    super.onStop(); 
    unbindService(MyService); 
} 

private void setTextLabel(TextView textView, Vector<String> y) { 
     if (!y.isEmpty()) { 
      textView.setText(myFormat.format(Integer.parseInt(y.firstElement())) + " kB"); 
      //textViewP.setText(myFormatPercent.format(Integer.parseInt(y.firstElement())* 100/(float) myAnReaderService.memTotal) + "%"); 
     } else 
      textView.setText("Value"); 
} 

} 

le chat journal eteint:

07-13 10:20:08.109: E/AndroidRuntime(745): FATAL EXCEPTION: main 
07-13 10:20:08.109: E/AndroidRuntime(745): java.lang.NullPointerException 
07-13 10:20:08.109: E/AndroidRuntime(745): at com.sliit.droidman.systemresources.Processor$2.onServiceConnected(Processor.java:49) 
07-13 10:20:08.109: E/AndroidRuntime(745): at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1097) 
07-13 10:20:08.109: E/AndroidRuntime(745): at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1114) 
07-13 10:20:08.109: E/AndroidRuntime(745): at android.os.Handler.handleCallback(Handler.java:615) 
07-13 10:20:08.109: E/AndroidRuntime(745): at android.os.Handler.dispatchMessage(Handler.java:92) 
07-13 10:20:08.109: E/AndroidRuntime(745): at android.os.Looper.loop(Looper.java:137) 
07-13 10:20:08.109: E/AndroidRuntime(745): at android.app.ActivityThread.main(ActivityThread.java:4745) 
07-13 10:20:08.109: E/AndroidRuntime(745): at java.lang.reflect.Method.invokeNative(Native Method) 
07-13 10:20:08.109: E/AndroidRuntime(745): at java.lang.reflect.Method.invoke(Method.java:511) 
07-13 10:20:08.109: E/AndroidRuntime(745): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
07-13 10:20:08.109: E/AndroidRuntime(745): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
07-13 10:20:08.109: E/AndroidRuntime(745): at dalvik.system.NativeStart.main(Native Method) 
07-13 10:20:15.860: E/Trace(764): error opening trace file: No such file or directory (2) 

je reçois une exception de pointeur nul à partir du code que je l'ai indiqué dans le code. S'il vous plaît aidez-moi à comprendre l'erreur que je fais dans cette section.

merci.

Answer 1

Cette ligne:

private Thread readThread = new Thread(readRunnable, "readThread"); 

Vous créez ce fil en service, mais jamais commencer/appeler. C'est la raison pour laquelle vos vecteurs sont vides. Essayez de le démarrer dans onBind().