Android高手进阶教程(八)之Android Widget开发案例(世界杯倒计时!)

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:

view plaincopy to clipboardprint?
<?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:

view plaincopy to clipboardprint?
<?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:

view plaincopy to clipboardprint?
<?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:
view plaincopy to clipboardprint?
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:

view plaincopy to clipboardprint?
<?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!!

 

 

本文出自 “Android_Tutor” 博客，请务必保留此出处http://weizhulin.blog.51cto.com/1556324/311438