ANDROID_MARS学习笔记_S02_005_AppWidget1

一、AppWidget介绍

1.要在手机生成AppWidget需的东西

(1)AppWidgetProviderInfo

　　a).res\xml\example_appwidget_info.xml

　　b)a中需要布局文件res\layout\example_appwidget.xml来定义AppWidget的样式

(2)AppWidgetProvider

a)自定义一个类ExampleAppWidgetProvider继承AppWidgetProvider，根据需求重写onXXX()

　 b)AppWidgetProvider实质是一个BroadcastReciever，通过接收系统广播来操作AppWidget，所以需要在AndroidManifest.xml定义<receiver>及其<intent-filter>等

2.

二、代码

1.res/xml/example_appwidget_info.xml

 <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
     android:minWidth="294dp"
     android:minHeight="72dp"
     android:updatePeriodMillis="86400000"
     android:initialLayout="@layout/example_appwidget"
  >
 </appwidget-provider>

2.res/layout/example_appwidget.xml

<?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"
    >
<TextView
    android:id="@+id/widgetTextId"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="firstWidgetText"
    android:background="#000000"
    />
</LinearLayout>

3.ExampleAppWidgetProvider.java

 package mars.appwidget01;
 
 import android.appwidget.AppWidgetManager;
 import android.appwidget.AppWidgetProvider;
 import android.content.Context;
 
 public class ExampleAppWidgetProvider extends AppWidgetProvider{
 
     @Override
     public void onUpdate(Context context, AppWidgetManager appWidgetManager,
             int[] appWidgetIds) {
         System.out.println("onupdate");
         super.onUpdate(context, appWidgetManager, appWidgetIds);
     }
 
     @Override
     public void onDeleted(Context context, int[] appWidgetIds) {
         System.out.println("onDeleted");
         super.onDeleted(context, appWidgetIds);
     }
 
     @Override
     public void onDisabled(Context context) {
         System.out.println("onDisabled");
         super.onDisabled(context);
     }
 
     @Override
     public void onEnabled(Context context) {
         System.out.println("onEnabled");
         super.onEnabled(context);
     }
 
 }

4.AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="mars.appwidget01" android:versionCode="1" android:versionName="1.0">
     <application android:icon="@drawable/icon" android:label="@string/app_name">
         <activity android:name=".MainActivity" android:label="@string/app_name">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <receiver android:name="ExampleAppWidgetProvider">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
             </intent-filter>
             <meta-data android:name="android.appwidget.provider"
                 android:resource="@xml/example_appwidget_info" />
         </receiver>
     </application>
     <uses-sdk android:minSdkVersion="7" />
 
 </manifest>