ANDROID_MARS学习笔记_S02_005_AppWidget1

Posted 2020-06-13

一、AppWidget介绍

1.Widget的定义创建流程

(1)在res新建xml文件夹，新建appwidget-provider.xml，为widget提供元数据

(2)在res/layout文件夹下定义widget的样式

(3)在src新建类,extends AppWidgetProvider，自定义widget

(4)在androidManifest.xml中把自定义的widget添加为receiver，接收APPWIDGET_UPDATE广播

2.

 

二、代码

1.res/xml/example_appwidget_info.xml

1 <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
2     android:minWidth="294dp"
3     android:minHeight="72dp"
4     android:updatePeriodMillis="86400000"
5     android:initialLayout="@layout/example_appwidget"
6  >
7 </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

 1 package mars.appwidget01;
 2 
 3 import android.appwidget.AppWidgetManager;
 4 import android.appwidget.AppWidgetProvider;
 5 import android.content.Context;
 6 
 7 public class ExampleAppWidgetProvider extends AppWidgetProvider{
 8 
 9     @Override
10     public void onUpdate(Context context, AppWidgetManager appWidgetManager,
11             int[] appWidgetIds) {
12         System.out.println("onupdate");
13         super.onUpdate(context, appWidgetManager, appWidgetIds);
14     }
15 
16     @Override
17     public void onDeleted(Context context, int[] appWidgetIds) {
18         System.out.println("onDeleted");
19         super.onDeleted(context, appWidgetIds);
20     }
21 
22     @Override
23     public void onDisabled(Context context) {
24         System.out.println("onDisabled");
25         super.onDisabled(context);
26     }
27 
28     @Override
29     public void onEnabled(Context context) {
30         System.out.println("onEnabled");
31         super.onEnabled(context);
32     }
33 
34 }

 

4.AndroidManifest.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="mars.appwidget01" android:versionCode="1" android:versionName="1.0">
 4     <application android:icon="@drawable/icon" android:label="@string/app_name">
 5         <activity android:name=".MainActivity" android:label="@string/app_name">
 6             <intent-filter>
 7                 <action android:name="android.intent.action.MAIN" />
 8                 <category android:name="android.intent.category.LAUNCHER" />
 9             </intent-filter>
10         </activity>
11         <receiver android:name="ExampleAppWidgetProvider">
12             <intent-filter>
13                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
14             </intent-filter>
15             <meta-data android:name="android.appwidget.provider"
16                 android:resource="@xml/example_appwidget_info" />
17         </receiver>
18     </application>
19     <uses-sdk android:minSdkVersion="7" />
20 
21 </manifest>