我有一个简单的按钮部件，可以翻转一组图像。现在我想要在一定时间间隔后自动翻转图片，而不是通过按钮点击。为此，我需要使用服务类。有谁能帮我解决如何将它包含在我的代码中的问题。我对服务不太了解。
以下是我的代码片段： //widgetprovider.java
以下是我的代码片段： //widgetprovider.java
public void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds){
//Log.i("Tag","In onUpdate method");
System.out.println("Tag In onUpdate method");
RemoteViews views=new RemoteViews(context.getPackageName(),R.layout.widget_layout);
views.setOnClickPendingIntent(R.id.widget_button, buildButtonPendingIntent(context));
Log.i("Tag","Context value after setOnClickPI before pushWIDGET:"+context);
pushWidgetUpdate(context,views);
Log.i("Tag","after pushwidget update:"+context);
}
public static PendingIntent buildButtonPendingIntent(Context context){
Intent intent=new Intent();
intent.setAction("com.example.android.intent.action.CHANGE_PICTURE");
Log.i("Tag","intent's action:"+intent);
return PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
}
public static void pushWidgetUpdate(Context context,RemoteViews views){
System.out.println("Inside pushwidget");
ComponentName myWidget=new ComponentName(context, MyWidgetProvider.class);
AppWidgetManager manager=AppWidgetManager.getInstance(context);
manager.updateAppWidget(myWidget, views);
}
//IntentReceiver.java
public void onReceive(Context context, Intent intent) {
// Log.i("Tag1","In onReceive:"+intent);
System.out.println("In onReceive()");
if (intent.getAction().equals(
"com.example.android.intent.action.CHANGE_PICTURE")) {
updateWidgetPictureAndButtonListener(context);
}
}
private void updateWidgetPictureAndButtonListener(Context context) {
RemoteViews views = new RemoteViews(context.getPackageName(),
R.layout.widget_layout);
views.setImageViewResource(R.id.widget_image, getImageToSet());
System.out.println("in updateWidgetPicture method");
// Log.i("Tag","in updaeWIdgetPicture method");
// remember to set ur button click listeners
views.setOnClickPendingIntent(R.id.widget_button,
MyWidgetProvider.buildButtonPendingIntent(context));
MyWidgetProvider.pushWidgetUpdate(context.getApplicationContext(),
views);
}
//编辑后的Java文件
package com.example.pictureappservice;
import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.RemoteViews;
// this works without service
public class MyWidgetProvider extends AppWidgetProvider {
private static int clickCount = 0;
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds){
Log.i("onUpdate method call","Called");
ComponentName thisWidget=new ComponentName(context, MyWidgetProvider.class);
int []allWidgetIds=appWidgetManager.getAppWidgetIds(thisWidget);
//built intent to call service
Intent intent=new Intent(context.getApplicationContext(),UpdateService.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS,allWidgetIds);
Log.i("LOG","before service");
//update widget via service
context.startService(new Intent(context,UpdateService.class));
}
public static class UpdateService extends Service{
public void onStart(Intent intent, int startId){
AppWidgetManager appWidgetManager=AppWidgetManager.getInstance(this.getApplicationContext());
int []allWidgetIds=intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);
ComponentName thisWidget=new ComponentName(getApplicationContext(),MyWidgetProvider.class);
int []allWidgetIds2=appWidgetManager.getAppWidgetIds(thisWidget);
Log.i("LOG","From Intent" + String.valueOf(allWidgetIds.length));
Log.i("LOG","Direct" + String.valueOf(allWidgetIds2.length));
for(int widgetId:allWidgetIds){
// logic
Log.i("LOG","intent's action"+intent.getAction());
//if (intent.getAction().equals("com.example.android.intent.action.CHANGE_PICTURE")) {
RemoteViews views=new RemoteViews(this.getApplicationContext().getPackageName(),R.layout.widget_layout);
views.setImageViewResource(R.id.widget_image, getImageToSet());
//intent
Intent clickIntent=new Intent(this.getApplicationContext(),MyWidgetProvider.class);
clickIntent.setAction("AppWidgetManager.ACTION_APPWIDGET_UPDATE");
//clickIntent.setAction("com.example.android.intent.action.CHANGE_PICTURE");
clickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);
Log.i("Tag","intent's action:"+intent);
PendingIntent pendingIntent=PendingIntent.getBroadcast(getApplicationContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.widget_image, pendingIntent);
appWidgetManager.updateAppWidget(widgetId,views);
//}
}
stopSelf();
super.onStart(intent, startId);
}
private int getImageToSet() {
clickCount++;
Log.i("Tag", "in getImageToSet()" + clickCount);
return clickCount % 2 == 0 ? R.drawable.paypal_logo : R.drawable.paypaldonation;
}
@Override
public IBinder onBind(Intent intent) {
// We don't need to bind to this service
return null;
}
}
public static void pushWidgetUpdate(Context context,RemoteViews views){
System.out.println("Inside pushwidget");
ComponentName myWidget=new ComponentName(context, MyWidgetProvider.class);
AppWidgetManager manager=AppWidgetManager.getInstance(context);
manager.updateAppWidget(myWidget, views);
}
}