Android中AppWidget使用方法

最新推荐文章于 2024-05-10 01:31:19 发布

最新推荐文章于 2024-05-10 01:31:19 发布 · 158 阅读

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本文详细介绍了如何在Android应用中创建自定义小部件(AppWidget)，包括布局文件的设计、注册小部件提供者(AppWidgetProvider)、处理广播信息等关键步骤。

一、创建AppWidget的布局文件,名称为appwidget_layout.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"
    >
<Button 
	android:id="@+id/button1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="测试"
    />
</LinearLayout>

二、创建appwidgetprovider，先在res文件夹下创建xml文件夹，同时在xml文件夹下创建appwidget_info.xml

<appwidget-provider 
xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="294dp"
    android:minHeight="72dp"
    android:updatePeriodMillis="600000"
    android:initialLayout="@layout/appwidget_layout"
   >
</appwidget-provider>

三、在AndroidManifest.xml中添加如下信息

<receiver android:name="cn.edu.appwidget.MyAppWidgetProvider">
		<intent-filter>
			<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
		</intent-filter>
		<meta-data
		 android:name="android.appwidget.provider"
		 android:resource="@xml/appwidget_info"
		/>
	</receiver>

四、继承AppWidgetProvider

package cn.edu.appwidget;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;
import cn.edu.design.AppWidget_01Activity;

import cn.edu.design.R;
public class MyAppWidgetProvider extends AppWidgetProvider{

	@Override
	public void onDeleted(Context context, int[] appWidgetIds) {
		// TODO Auto-generated method stub

		super.onDeleted(context, appWidgetIds);
	}

	@Override
	public void onDisabled(Context context) {
		// TODO Auto-generated method stub
		super.onDisabled(context);
		
	}

	@Override
	public void onEnabled(Context context) {
		// TODO Auto-generated method stub
		super.onEnabled(context);
		
	}

	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
		super.onReceive(context, intent);
		
	}

	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		System.out.println("update");
		for(int i=0;i<appWidgetIds.length;i++){
			Intent intent=new Intent(context,AppWidget_01Activity.class);
			PendingIntent pendingIntent=PendingIntent.getActivity(context, 0, intent, 0);
			RemoteViews remoteViews=new RemoteViews(context.getPackageName(),R.layout.appwidget_layout);
			remoteViews.setOnClickPendingIntent(R.id.button1, pendingIntent);
			appWidgetManager.updateAppWidget(appWidgetIds[i], remoteViews);
			
		}
		
		
		// TODO Auto-generated method stub
		super.onUpdate(context, appWidgetManager, appWidgetIds);
	}

}

五、处理广播信息

1、其他步骤和上面的方法相同，将AndroidManifest.xml修改为

<receiver android:name="cn.edu.appwidget.MyAppWidgetProvider_01">
		<intent-filter>
			<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
		</intent-filter>
		<intent-filter >
			<action android:name="cn.edu.myaction"/> <!--cn.edu.myaction是自己定义的字符串-->
		</intent-filter>
		<meta-data
		 android:name="android.appwidget.provider"
		 android:resource="@xml/appwidget_info"
		/>
	</receiver>

2、在继承AppWidgetProvider的类中

public class MyAppWidgetProvider_01 extends AppWidgetProvider{
  //自己定义字符串，在Intent的Action中使用
  private final static String MY_ACTION="cn.edu.myaction";

	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
		super.onReceive(context, intent);
		if(intent.getAction().equals(MY_ACTION)){
			System.out.println("execute broadcast");
		}
	}

	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		// TODO Auto-generated method stub
		
		System.out.println("update");
		for(int i=0;i<appWidgetIds.length;i++){
			Intent intent=new Intent();
			intent.setAction(MY_ACTION);
//当执行pendingIntent的时候会产生一个广播消息
			PendingIntent pendingIntent=PendingIntent.getBroadcast(context, 0, intent, 0);
			RemoteViews remoteViews=new RemoteViews(context.getPackageName(),R.layout.appwidget_layout);
//为aawidget的布局文件中的按钮增加事件
			remoteViews.setOnClickPendingIntent(R.id.button1, pendingIntent);
			appWidgetManager.updateAppWidget(appWidgetIds[i], remoteViews);
			
		}
		
		super.onUpdate(context, appWidgetManager, appWidgetIds);
	}

}