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Android桌面组件App Widget完整案例

转载 作者:qq735679552 更新时间:2022-09-27 22:32:09 27 4
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本文实例讲述了Android桌面组件App Widget用法。分享给大家供大家参考。具体如下:

这里模拟一个案例: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:

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<? 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:

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<? 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:

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<? 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:

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package com.ljq.activity;
public class UtilTool {
  public static boolean isChange= true ;
}

TestActivity类,继承自AppWidgetProvider:

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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);
  }
}

希望本文所述对大家的Android程序设计有所帮助.

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