今天我們要寫一下Android Widget的開發，由於快點凌晨，我就不說的太具體了，同志們就模仿吧！首先看一下效果圖:
下面是Demo的詳細步驟:
一、新建一個Android工程命名爲:WidgetDemo.
二、準備素材，一個是Widget的圖標，一個是Widget的背景。存放目錄如下圖:
三、修改string.xml文件如下:
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<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, WidetDemo!</string>
<string name="app_name">DaysToWorldCup</string>
</resources>
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, WidetDemo!</string>
<string name="app_name">DaysToWorldCup</string>
</resources>
四、建立Widget內容提供者文件，我們在res下建立xml文件夾，並且新建一個widget_provider.xml代碼入下:
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<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="50dip"
android:minHeight="50dip"
android:updatePeriodMillis="10000"
android:initialLayout="@layout/main"
/>
<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="50dip"
android:minHeight="50dip"
android:updatePeriodMillis="10000"
android:initialLayout="@layout/main"
/>
五、修改main.xml佈局，代碼如下:
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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"
android:background="@drawable/wordcup"
>
<TextView
android:id="@+id/wordcup"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
android:textSize="12px"
android:textColor="#ff0000"
/>
</LinearLayout>
<?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"
android:background="@drawable/wordcup"
>
<TextView
android:id="@+id/wordcup"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
android:textSize="12px"
android:textColor="#ff0000"
/>
</LinearLayout>
六、修改WidgetDemo.java代碼如下:
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package com.android.tutor;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Timer;
import java.util.TimerTask;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.widget.RemoteViews;
public class WidetDemo extends AppWidgetProvider {
/** Called when the activity is first created. */
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
Timer timer = new Timer();
timer.scheduleAtFixedRate(new MyTime(context,appWidgetManager), 1, 60000);
super.onUpdate(context, appWidgetManager, appWidgetIds);
}
private class MyTime extends TimerTask{
RemoteViews remoteViews;
AppWidgetManager appWidgetManager;
ComponentName thisWidget;
public MyTime(Context context,AppWidgetManager appWidgetManager){
this.appWidgetManager = appWidgetManager;
remoteViews = new RemoteViews(context.getPackageName(),R.layout.main);
thisWidget = new ComponentName(context,WidetDemo.class);
}
public void run() {
Date date = new Date();
Calendar calendar = new GregorianCalendar(2010,06,11);
long days = (((calendar.getTimeInMillis()-date.getTime())/1000))/86400;
remoteViews.setTextViewText(R.id.wordcup, "距離南非世界盃還有" + days+"天");
appWidgetManager.updateAppWidget(thisWidget, remoteViews);
}
}
}
package com.android.tutor;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Timer;
import java.util.TimerTask;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.widget.RemoteViews;
public class WidetDemo extends AppWidgetProvider {
/** Called when the activity is first created. */
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
Timer timer = new Timer();
timer.scheduleAtFixedRate(new MyTime(context,appWidgetManager), 1, 60000);
super.onUpdate(context, appWidgetManager, appWidgetIds);
}
private class MyTime extends TimerTask{
RemoteViews remoteViews;
AppWidgetManager appWidgetManager;
ComponentName thisWidget;
public MyTime(Context context,AppWidgetManager appWidgetManager){
this.appWidgetManager = appWidgetManager;
remoteViews = new RemoteViews(context.getPackageName(),R.layout.main);
thisWidget = new ComponentName(context,WidetDemo.class);
}
public void run() {
Date date = new Date();
Calendar calendar = new GregorianCalendar(2010,06,11);
long days = (((calendar.getTimeInMillis()-date.getTime())/1000))/86400;
remoteViews.setTextViewText(R.id.wordcup, "距離南非世界盃還有" + days+"天");
appWidgetManager.updateAppWidget(thisWidget, remoteViews);
}
}
}
七、修改配置文件AndroidManifest.xml，代碼如下:
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.tutor"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<receiver android:name=".WidetDemo"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="@xml/widget_provider"
/>
</receiver>
</application>
<uses-sdk android:minSdkVersion="7" />
</manifest>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.tutor"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<receiver android:name=".WidetDemo"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="@xml/widget_provider"
/>
</receiver>
</application>
<uses-sdk android:minSdkVersion="7" />
</manifest>
八、點擊運行(Ctrl+F11),之，運行成功後，我們長時間點擊桌面，會出現如下倆個，依次點擊，就可以看到最上面的效果圖:
本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/Android_Tutor/archive/2010/04/29/5544471.aspx