package shy.luo.hello;

import shy.luo.hello.R;
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 Hello extends Activity implements 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.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);
  }
 }
}

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <LinearLayout
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:orientation="vertical" 
 android:gravity="center">
 <TextView 
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" 
 android:text="@string/value">
 </TextView>
 <EditText 
 android:layout_width="fill_parent"
 android:layout_height="wrap_content" 
 android:id="@+id/edit_value"
 android:hint="@string/hint">
 </EditText>
 </LinearLayout>
 <LinearLayout
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal" 
 android:gravity="center">
 <Button 
 android:id="@+id/button_read"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="@string/read">
 </Button>
 <Button 
 android:id="@+id/button_write"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="@string/write">
 </Button>
 <Button 
 android:id="@+id/button_clear"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="@string/clear">
 </Button>
 </LinearLayout>
 </LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
 <resources>
 <string name="app_name">Hello</string>
 <string name="value">Value</string>
 <string name="hint">Please input a value...</string>
 <string name="read">Read</string>
 <string name="write">Write</string>
 <string name="clear">Clear</string>
 </resources>

<?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="shy.luo.hello"
 android:versionCode="1"
 android:versionName="1.0">
 <application android:icon="@drawable/icon" android:label="@string/app_name">
 <activity android:name=".Hello"
  android:label="@string/app_name">
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />
 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
 </application>
 </manifest>