为 Android 首屏创建 AppWidget，androidappwidget

为 Android 首屏创建 AppWidget，androidappwidget

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1.MovieSearchWidget.java

package com.javacodegeeks.android.apps.moviesearchapp.widget;

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.net.Uri;
import android.os.IBinder;
import android.widget.RemoteViews;

import com.javacodegeeks.android.apps.moviesearchapp.R;
import com.javacodegeeks.android.apps.moviesearchapp.model.Movie;
import com.javacodegeeks.android.apps.moviesearchapp.services.MovieSeeker;

public class MovieSearchWidget extends AppWidgetProvider {
   
   private static final String IMDB_BASE_URL = "http://m.imdb.com/title/";
   
   @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        // To prevent any ANR timeouts, we perform the update in a service
        context.startService(new Intent(context, UpdateService.class));
    }

    public static class UpdateService extends Service {
       
       private MovieSeeker movieSeeker = new MovieSeeker();
       
        @Override
        public void onStart(Intent intent, int startId) {
            // Build the widget update for today
            RemoteViews updateViews = buildUpdate(this);

            // Push update for this widget to the home screen
            ComponentName thisWidget = new ComponentName(this, MovieSearchWidget.class);
            AppWidgetManager manager = AppWidgetManager.getInstance(this);
            manager.updateAppWidget(thisWidget, updateViews);
        }
        
      public RemoteViews buildUpdate(Context context) {
           
         Movie movie = movieSeeker.findLatest();               
         
         String imdbUrl = IMDB_BASE_URL + movie.imdbId;

         // Build an update that holds the updated widget contents
         RemoteViews updateViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);

         updateViews.setTextViewText(R.id.app_name, getString(R.string.app_name));
         updateViews.setTextViewText(R.id.movie_name, movie.name);
         
         Intent intent = new Intent();
         intent.setAction("android.intent.action.VIEW");
         intent.addCategory("android.intent.category.BROWSABLE");
         intent.setData(Uri.parse(imdbUrl));
         
         PendingIntent pendingIntent = 
            PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
           
         updateViews.setOnClickPendingIntent(R.id.movie_name, pendingIntent);
         
         return updateViews;

      }

        @Override
        public IBinder onBind(Intent intent) {
            // We don't need to bind to this service
            return null;
        }
        
    }

}

2.movie_search_widget.xml

<?xml version="1.0" encoding="utf-8"?>

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="146dip"
    android:minHeight="72dip"
    android:updatePeriodMillis="10000"
    android:initialLayout="@layout/widget_layout"
/>

3./res/layout/widget_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="146dip"
    android:minHeight="72dip"
    android:updatePeriodMillis="10000"
    android:initialLayout="@layout/widget_layout"
/>

4./res/layout/widget_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/widget"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:focusable="true"
    style="@style/WidgetBackground">
    
    <TextView
        android:id="@+id/app_name"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:layout_marginTop="14dip"
        android:layout_marginBottom="1dip"
        android:includeFontPadding="false"
        android:singleLine="true"
        android:ellipsize="end"
        style="@style/Text.WordTitle" />
    
    <TextView  
        android:id="@+id/movie_name"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"
        android:layout_below="@id/app_name"
        android:paddingRight="5dip"
        android:paddingBottom="4dip"
        android:includeFontPadding="false"
        android:lineSpacingMultiplier="0.9"
        android:maxLines="4"
        android:fadingEdge="vertical"
        style="@style/Text.Movie" />
    
</RelativeLayout>

5.res/values/styles.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <style name="WidgetBackground">
        <item name="android:background">@drawable/widget_bg</item>
    </style>
    
    <style name="Text">
    </style>
    
    <style name="Text.Title">
        <item name="android:textSize">16sp</item>
        <item name="android:textStyle">bold</item>
        <item name="android:textColor">@android:color/black</item>
    </style>
    
    <style name="Text.Movie">
        <item name="android:textSize">13sp</item>
        <item name="android:textColor">@android:color/black</item>
    </style>
     
</resources>

6.AndroidManifest.xml

<application android:icon="@drawable/icon" android:label="@string/app_name">
...     
        <!-- Broadcast Receiver that will process AppWidget updates -->
        <receiver android:name=".widget.MovieSearchWidget" android:label="@string/widget_name">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>
            <meta-data android:name="android.appwidget.provider" android:resource="@xml/movie_search_widget" />
        </receiver>
        
        <!-- Service to perform web API queries -->        
        <service android:name=".widget.MovieSearchWidget$UpdateService" />        

...
</application>