• Android之桌面组件App Widget案例


    模拟一个案例:把AppWidget添加到桌面后,点击AppWidget后AppWidget文本会轮回改变

    main.xml布局文件

    <?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/tv"
    android:layout_width
    ="fill_parent"
    android:layout_height
    ="wrap_content"
    android:text
    ="程序入口"
    android:textSize
    ="50dip"/>
    </LinearLayout>

    res/xml/my_appwidget.xml布局文件

    <?xml version="1.0" encoding="utf-8"?>
    <appwidget-provider
    xmlns:android
    ="http://schemas.android.com/apk/res/android"
    android:minWidth
    ="120dp"
    android:minHeight
    ="60dp"
    android:updatePeriodMillis
    ="1000"
    android:initialLayout
    ="@layout/main">
    </appwidget-provider>

    清单文件

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ljq.activity" android:versionCode="1"
    android:versionName
    ="1.0">
    <application android:icon="@drawable/icon"
    android:label
    ="@string/app_name">
    <receiver android:name=".TestActivity">
    <meta-data android:name="android.appwidget.provider"
    android:resource
    ="@xml/my_appwidget">
    </meta-data>
    <intent-filter>
    <action android:name="COM.LJQ.ACTION.WIDGET.CLICK"></action>
    <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
    </intent-filter>
    </receiver>
    </application>
    <uses-sdk android:minSdkVersion="7" />

    </manifest>

    变量类UtilTool:用来控件文本改变

    package com.ljq.activity;


    public class UtilTool {
    public static boolean isChange=true;
    }

    TestActivity类,继承自AppWidgetProvider

    package com.ljq.activity;

    import android.app.PendingIntent;
    import android.appwidget.AppWidgetManager;
    import android.appwidget.AppWidgetProvider;
    import android.content.ComponentName;
    import android.content.Context;
    import android.content.Intent;
    import android.widget.RemoteViews;

    public class TestActivity extends AppWidgetProvider {
    // 自定义一个Action名
    private static final String ACTION_CLICK_NAME = "COM.LJQ.ACTION.WIDGET.CLICK";
    private RemoteViews rv;

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    System.out.println(
    "onUpdate");
    //获取R.layout.main布局,通过类RemoteViews对布局R.layout.main里的控件进行操作
    /*rv = new RemoteViews(context.getPackageName(), R.layout.main);
    Intent intentClick = new Intent(ACTION_CLICK_NAME);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intentClick, 0);
    rv.setOnClickPendingIntent(R.id.tv, pendingIntent);

    ComponentName cmp = new ComponentName(context, TestActivity.class);
    AppWidgetManager myAppWidgetManager = AppWidgetManager.getInstance(context);
    myAppWidgetManager.updateAppWidget(cmp, rv);
    */
    final int N = appWidgetIds.length;
    for (int i = 0; i < N; i++) {
    int appWidgetId = appWidgetIds[i];
    updateAppWidget(context, appWidgetManager, appWidgetId);
    }

    }

    //AppWidget生命周期: 每接收一次,广播执行一次为一个生命周期结束。
    //也就是说在重写AppWidgetProvider类里面声明全局变量做状态判断,
    //每次状态改变AppWidgetProvider再接收第二次广播时即为你重新初始化也就是说重新实例化了一次AppWidgetProvider。
    //今天我因为在里面放了一个boolean值初始化为true,观察调试看到每次进入都为TRUE故你在设置桌面组件时,
    //全局变量把它声明在另外一个实体类用来判断是没问题的,切忌放在本类。
    @Override
    public void onReceive(Context context, Intent intent) {
    System.out.println(
    "onReceive");
    if (rv == null) {
    rv
    = new RemoteViews(context.getPackageName(), R.layout.main);
    }
    if (intent.getAction().equals(ACTION_CLICK_NAME)) {
    if (UtilTool.isChange) {
    rv.setTextViewText(R.id.tv,
    "abc");
    }
    else {
    rv.setTextViewText(R.id.tv,
    "123");
    }
    UtilTool.isChange
    = !UtilTool.isChange;
    AppWidgetManager appWidgetManger
    = AppWidgetManager.getInstance(context);
    int[] appIds = appWidgetManger.getAppWidgetIds(new ComponentName(context, TestActivity.class));
    appWidgetManger.updateAppWidget(appIds, rv);
    }
    else{
    super.onReceive(context, intent);
    }

    }

    private void updateAppWidget(Context context,
    AppWidgetManager appWidgeManger,
    int appWidgetId) {
    rv
    = new RemoteViews(context.getPackageName(), R.layout.main);
    Intent intentClick
    = new Intent();
    intentClick.setAction(ACTION_CLICK_NAME);
    PendingIntent pendingIntent
    = PendingIntent.getBroadcast(context, 0, intentClick, 0);
    rv.setOnClickPendingIntent(R.id.tv, pendingIntent);
    appWidgeManger.updateAppWidget(appWidgetId, rv);
    }

    }
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  • 原文地址:https://www.cnblogs.com/linjiqin/p/1969153.html
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