Android桌面小插件——Widget

效果图

实现

1. 创建Widget类

package com.kongqw.kqwwidget;

import android.appwidget.AppWidgetManager;

import android.appwidget.AppWidgetProvider;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.widget.RemoteViews;

import android.widget.Toast;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

/**

 * Created by kongqw on 2015/12/31.

 */

public class KqwWidget extends AppWidgetProvider {

    @Override

    public void onDeleted(Context context, int[] appWidgetIds) {

        super.onDeleted(context, appWidgetIds);

    }

    @Override

    public void onDisabled(Context context) {

        super.onDisabled(context);

    }

    @Override

    public void onEnabled(Context context) {

        super.onEnabled(context);

    }

    @Override

    public void onReceive(Context context, Intent intent) {

        super.onReceive(context, intent);

    }

    @Override

    public void onUpdate(final Context context, final AppWidgetManager appWidgetManager, int[] appWidgetIds) {

        super.onUpdate(context, appWidgetManager, appWidgetIds);

        Timer timer = new Timer();

        TimerTask timerTask = new TimerTask() {

            @Override

            public void run() {

                ComponentName provider = new ComponentName(context.getApplicationContext(), KqwWidget.class);

                /*

                 * 获取Widget远程View对象

                 * 参数1 Widget的包名

                 * 参数2 Widget的布局id

                 */

                RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget);

                // 获取远程View布局中的控件

                Date date = new Date();

                DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

                String time = format.format(date);

                views.setTextViewText(R.id.textView, "时间:" + time);

                appWidgetManager.updateAppWidget(provider, views);

            }

        };

        // 开启定时任务，每5秒更新执行一次

        timer.schedule(timerTask, 1000, 1000);

    }

    public void method(Context context) {

        Toast.makeText(context, "KqwWidget里的方法", Toast.LENGTH_SHORT).show();

    }

}

2. 在清单文件中注册Widget控件

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.kongqw.kqwwidget">

    <application

        ……>

        ……

        <receiver android:name=".KqwWidget" >

            <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>

    </application>

</manifest>

3. 创建Widget配置文件

<?xml version="1.0" encoding="utf-8"?>

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"

    android:initialLayout="@layout/appwidget"

    android:minHeight="72dp"

    android:minWidth="294dp"

    android:previewImage="@mipmap/ic_launcher"

    android:updatePeriodMillis="86400000" />

4. 添加Widget布局文件

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="100dp"

    tools:context="com.kongqw.kqwwidget.MainActivity">

    <TextView

        android:id="@+id/textView"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:background="#FFFFFFFF"

        android:gravity="center"

        android:text="时间"

        android:textColor="#FF000000"

        android:textSize="30dp" />

</RelativeLayout>

调用Widget里的方法

KqwWidget kqwWidget = new KqwWidget();

kqwWidget.method(this);