你能告诉我在运行后台服务的代码中犯了什么错误吗？是否有任何其他代码可用于运行后台服务。以下程序是否正确.... 如何在 android 中运行后台服务？
FrontEnd.java:
*****************
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class FrontEnd extends Activity implements OnClickListener {
private Button btnStartService, btnStopService;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.frontend);
bindComponents();
addListener();
init();
}
private void bindComponents() {
btnStartService = (Button)findViewById(R.id.btnStartService);
btnStopService = (Button)findViewById(R.id.btnStopService);
}
private void addListener() {
btnStartService.setOnClickListener(this);
btnStopService.setOnClickListener(this);
}
private void init() {
}
public void onClick(View view) {
Intent mIntent = new Intent(this,BackEndService.class);
System.out.println("------------------------>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<");
switch (view.getId()) {
case R.id.btnStartService:
startService(mIntent);
break;
case R.id.btnStopService:
stopService(mIntent);
break;
default:
break;
}
}
}
******************************************************************************************************************
BackEndService.java
*********************
import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
public class BackEndService extends Service{
private static final String tag = "Panacea";
@Override
public IBinder onBind(Intent intent) {
Log.d(tag, "onBind");
return null;
}
@Override
public void onCreate() {
super.onCreate();
Log.d(tag, "onCreate");
Notification notification = new Notification(R.drawable.launcher, getText(R.string.app_name),
System.currentTimeMillis());
Intent notificationIntent = new Intent(this, GmaTestApp01Activity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
notification.setLatestEventInfo(this, "BackGround Service", "Project is running", pendingIntent);
startForeground(1, notification);
}
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
Log.d(tag, "onStart startId=" + startId);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d(tag, "onStartCommand startId=" + startId);
return super.onStartCommand(intent, flags, startId);
}
@Override
public boolean onUnbind(Intent intent) {
Log.d(tag, "onUnbind");
return super.onUnbind(intent);
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(tag, "onDestroy");
}
@Override
public void onRebind(Intent intent) {
super.onRebind(intent);
}
}
*******************************************************************************************************************
frontend.xml
***************
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="vertical"
>
<Button
android:id="@+id/btnStartService"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/start_service"
/>
<Button
android:id="@+id/btnStopService"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/stop_service" />
</LinearLayout>
更新：
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class Home extends Activity
{
Integer[] imageIDs = {
R.drawable.a,
R.drawable.b,
R.drawable.c,
R.drawable.d,
R.drawable.e,
R.drawable.f,
R.drawable.g,
R.drawable.h,
R.drawable.i,
};
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
GridView gridView = (GridView) findViewById(R.id.gridview);
gridView.setAdapter(new ImageAdapter(this));
gridView.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent,
View v, int position, long id)
{
/*Toast.makeText(getBaseContext(),
"pic" + (position + 1) + " selected",
Toast.LENGTH_SHORT).show();*/
int pos= position + 1;
if(pos == 1)
{
Intent intent = new Intent("com.project.GmaTestApp01Activity");
startActivity(intent);
}
else if(pos == 2)
{
Intent intent = new Intent("com.project.FrontEnd");
startActivity(intent);
}
else if(pos == 9)
{
Intent intent = new Intent("com.project.UserProfile");
startActivity(intent);
}
else
{
Toast.makeText(getBaseContext(),"Coming Soon!", Toast.LENGTH_SHORT).show();
}
}
});
gridView.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_MOVE){
return true;
}
return false;
}
});
}
public class ImageAdapter extends BaseAdapter
{
private Context context;
public ImageAdapter(Context c)
{
context = c;
}
//---returns the number of images---
public int getCount() {
return imageIDs.length;
}
//---returns the ID of an item---
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
//---returns an ImageView view---
public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(185, 185));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(5, 5, 5, 5);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(imageIDs[position]);
return imageView;
}
}
}