如何將非靜態處理程序轉換爲靜態處理程序

Question

我非常難以將非靜態處理程序轉換爲靜態處理程序。 我嘗試了各種方法，但每次我最終都在做一些雜亂的事情。 在提供的代碼中，請糾正我如何實現這一點。我曾經嘗試過一個例子，我不得不將大部分變量和函數都改成靜態的，這些靜態變量是從處理程序引用的。但仍然有額外的錯誤。

public class MainActivity extends Activity implements Runnable { 

private TextView textView; 
boolean connectionToTupleSpace=false; 
private TupleSpace ts = null; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    textView = (TextView) findViewById(R.id.myText); 
    textView.setText("it is testing"); 
    findViewById(R.id.login_button).setOnClickListener(buttonLogin); 
} 

public final Button.OnClickListener buttonLogin = new Button.OnClickListener() { 
    @Override 
    public void onClick(View v) { 
     Thread thread = new Thread(MainActivity.this); 
     thread.start(); 
    } 
}; 

@Override 
public void run() { 
    Looper.prepare(); 

    try { 
     ts = new TupleSpace("192.168.1.100",2525,"Orientation"); 
     connectionToTupleSpace = true; 
    }catch (TupleSpaceException e) { 
     connectionToTupleSpace = false; 
     e.printStackTrace(); 
    } 
    handler.sendEmptyMessage(0); 
} 

private Handler handler = new Handler() { 

    private Looper myLooper; 

    @Override 
    public void handleMessage(Message msg) { 
     if(connectionToTupleSpace == true) 
     { 
      Toast.makeText(getBaseContext(), " Tuple Space Server is Connected", Toast.LENGTH_SHORT).show(); 
      showTuples(); 
     } 
     else 
     { 
      /*Toast.makeText(getBaseContext(), " No connection to Tuple Space Server", Toast.LENGTH_SHORT).show();*/ 
      showDialog("Connection", "there is no connection"); 

     } 
     myLooper = Looper.myLooper(); 
     Looper.loop(); 
     myLooper.quit(); 
    } 
}; 

public void showTuples() 
{ 

    Tuple template = new Tuple(String.class, Integer.class); 

    Tuple[] returnTuple = null; 
    try { 
     returnTuple = ts.readAll(template); 
    } catch (TupleSpaceException e) { 
     e.printStackTrace(); 
    } 

    int num = returnTuple.length; 
    if (num == 0) 
     System.out.print("No tuples in the space"); 
    else 
     for(int i=0;i<num;i++) 
     { 
      System.out.print("\nTotal tuples are" + num+"\nYou found " + returnTuple[i]); 
      showDialog(returnTuple[i].getField(0).toString(),returnTuple[i].getField(1).toString()); 

     } 
} 

private void showDialog(String title, String message) 
{ 
    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); 
    builder.setTitle(title); 
    builder.setMessage(message); 
    builder.setPositiveButton("OK", null); 
    builder.show(); 
} 

}

Answer 1

只要做到這樣

private Handler handler = new MyHandler(this); 

private static class MyHandler extends Handler { 
    MainActivity activity; 
    public MyHandler(MainActivity activity) { 
    this.activity = activity; 
    } 
    @Override 
    public void handleMessage(Message msg) { 
    ... 
    activity.showTuples(); 
    ... 
    } 
} 

要使用靜態類（MyHandler的內）內的活動，你必須通過它像參數到構造。

編輯：添加MainActivity參數的構造函數。