今天我们要写一下Android Widget的开发，由于快点凌晨，我就不说的太具体了，同志们就模仿吧！首先看一下效果图:
下面是Demo的详细步骤:
一、新建一个Android工程命
名为:WidgetDemo.
二、准备素材，一个是Widget的图标，一个是Widget的背景。存放目录如下图:
三、修改string.xml文件如下:
<?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内容提供者文件，我们在res下建立xml文件夹，并且新建一个
widget_provider.xml代码入下:
<?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布局，代码如下:
<?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
码如下: 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, "距离南非世界杯还有" + 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, "距离南非世界杯还有" + days+"天");
appWidgetManager.updateAppWidget(thisWidget, remoteViews);
}
}
}
七、修改配置文件AndroidManifest.xml，代码如下:
<?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、点击运行(Ctrl+F11),之，运行成功后，我们长时间点击桌面，会出现如下俩个，依次点击，就可以看到最上面的效果图:
今天就到这里了，我困了呵呵，我发现时间好像不对劲，lol~我也不去多想了，大
家知道的告诉我下!对日历这些东西不是太了解，谢谢!!