content: package com.example.phdemo.myapplication;
  
  import android.os.RemoteException;
  import android.app.Activity;
  import android.os.ServiceManager;
  import android.os.Bundle;
  import android.os.IHelloService;
  import android.os.RemoteException;
  import android.util.Log;
  import android.view.View;
  import android.view.View.OnClickListener;
  import android.widget.Button;
  import android.widget.EditText;
  
  public class MainActivity extends Activity implements View.OnClickListener {
  
      private final static String LOG_TAG = "shy.luo.renju.Hello";
  
      private IHelloService helloService = null;
  
      private EditText valueText = null;
      private Button readButton = null;
      private Button writeButton = null;
      private Button clearButton = null;
  
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          helloService = IHelloService.Stub.asInterface(
                  ServiceManager.getService("hello"));
  
          valueText = (EditText)findViewById(R.id.edit_value);
          readButton = (Button)findViewById(R.id.button_read);
          writeButton = (Button)findViewById(R.id.button_write);
          clearButton = (Button)findViewById(R.id.button_clear);
  
          readButton.setOnClickListener(this);
          writeButton.setOnClickListener(this);
          clearButton.setOnClickListener(this);
  
          Log.i(LOG_TAG, "Hello Activity Created");
      }
  
      @Override
      public void onClick(View v) {
          if(v.equals(readButton)) {
              try {
                  int val = helloService.getVal();
                  String text = String.valueOf(val);
                  valueText.setText(text);
              } catch (RemoteException e) {
                  Log.e(LOG_TAG, "Remote Exception while reading value from device.");
              }
          }
          else if(v.equals(writeButton)) {
              try {
                  String text = valueText.getText().toString();
                  int val = Integer.parseInt(text);
                  helloService.setVal(val);
              } catch (RemoteException e) {
                  Log.e(LOG_TAG, "Remote Exception while writing value to device.");
              }
          }
          else if(v.equals(clearButton)) {
              String text = "";
              valueText.setText(text);
          }
      }
  }
  