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).resxmlexample_appwidget_info.xml

　　b)a中需要布局文件reslayoutexample_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>