android Widgets

最新推荐文章于 2024-02-19 22:30:05 发布

原创最新推荐文章于 2024-02-19 22:30:05 发布 · 147 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#Android #OS #XML

本文介绍如何使用Android AppWidget创建桌面小部件，包括继承AppWidgetProvider、实现onUpdate方法及利用Service定时更新小部件显示。

上班天天打酱油，哎无事就学习了下android Widgets 桌面小布件，先看下文档

Dev Guide -》App Widgets

本人英文不好直接上代码了

先写个类继承AppWidgetProvider

package com.test.App_widget;

import java.util.Calendar;

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

public class MyApp_widget extends AppWidgetProvider {

	
	private Context context;
	
	@Override
	public void onUpdate( Context context,  AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		updateAppWidget(context, appWidgetManager, appWidgetIds);
		context.startService(new Intent(context,MyServices.class));
	}
	 static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
	            int [] appWidgetIds) {
		 Log.e("updateAppWidget", "updateAppWidget---------------------onStart");
		  int N = appWidgetIds.length;
		 for (int i = 0; i < N; i++) {
				 int appWidgetId = appWidgetIds[i];

				// Create an Intent to launch ExampleActivity
				//Intent intent = new Intent(context, MainActivity.class);
				//PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
				//		intent, 0);

				// Get the layout for the App Widget and attach an on-click listener
				// to the button
				RemoteViews views = new RemoteViews(context.getPackageName(),
						R.layout.main);
				 Calendar calendar=Calendar.getInstance();
				 int hour=calendar.get(Calendar.HOUR);
				 int minute=calendar.get(Calendar.MINUTE);
				 int second=calendar.get(Calendar.SECOND);
				 if(minute<10){
					 views.setTextViewText(R.id.textView1, ""+hour+":0"+minute+":"+second);
				 }else if(second<10){
					 views.setTextViewText(R.id.textView1, ""+hour+":"+minute+":0"+second);
				 }else if(minute<10&&second<10){
					 views.setTextViewText(R.id.textView1, ""+hour+":0"+minute+":"+second);
				 } else{
					 views.setTextViewText(R.id.textView1, ""+hour+":"+minute+":"+second);
				 }
				
				// views.setOnClickPendingIntent(R.id.button, pendingIntent);

				// Tell the AppWidgetManager to perform an update on the current App
				// Widget
				appWidgetManager.updateAppWidget(appWidgetId, views);
			}
	    }

}

当你在添加小部件时，他会自己调用onUpdate方法

然后是配置

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.test.App_widget"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="7" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        
	<receiver android:name=".MyApp_widget">
		<intent-filter>
			<action android:name="android.appwidget.action.APPWIDGET_UPDATE"></action>
		</intent-filter>
		<meta-data android:name="android.appwidget.provider" android:resource="@xml/appwidget_info" />
	</receiver>
	<service android:name=".MyServices"></service>
    </application>
</manifest>

其实这个类也是这个广播接收器，重要的是

<meta-data android:name="android.appwidget.provider" android:resource="@xml/appwidget_info" />

我们来看下这个文件

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="294dp"
    android:minHeight="72dp"
    android:updatePeriodMillis="86400000"
    android:initialLayout="@layout/main"
     >
</appwidget-provider>

这些属性大家也知道是什么意思，一定是指定这个小部件的大小样式等

下面看下怎么更新这个小部件的样式，比如是个时钟第一秒是不是要刷新一次界面，这里我们写个services

package com.test.App_widget;

import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;

public class MyServices extends Service{

	
	@Override
	public IBinder onBind(Intent arg0) {
		return null;
	}

	@Override
	public void onStart(final Intent intent, final int startId) {
		Log.e("MyServices", "MyServices---------------------onStart");
		super.onStart(intent, startId);
		AppWidgetManager appWidgetManager=AppWidgetManager.getInstance(this);
		int []appWidgetIds =appWidgetManager.getAppWidgetIds(new ComponentName(this, MyApp_widget.class));
		MyApp_widget.updateAppWidget(this, appWidgetManager, appWidgetIds);
		
		new Handler().postDelayed(new Runnable() {
			
			@Override
			public void run() {
				onStart(intent, startId);
			}
		}, 1000);
	}

	
}

这样就可以