Android应用小部件appwidget开发全部代码案例和说明

在res目录下创建xml文件目录

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="40dp" //宽度
    android:minHeight="40dp"  //高度
    android:updatePeriodMillis="86400000" //每隔多长时间刷新一次 但已不建议使用了，由于为了手机省电，所以android规定最少30分钟刷新一次
    android:previewImage="@drawable/preview" //默认显示预览图片
    android:initialLayout="@layout/example_appwidget" //显示的ui android:configure="com.example.android.ExampleAppWidgetConfigure" //指定参数配置
    android:resizeMode="horizontal|vertical" //水平的或垂直的
    android:widgetCategory="home_screen"> //home_screen|keyguard  主屏和锁屏
</appwidget-provider>

以下是全部代码

WidgetActivity.java

package com.example.a20200712;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.RemoteViews;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import java.text.SimpleDateFormat;
import java.util.Date;

public class WidgetActivity extends AppWidgetProvider {

    /**
     * 创建同类型的实例每次都会执行一次,
     * @param context
     * @param appWidgetManager
     * @param appWidgetIds
     */
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        super.onUpdate(context, appWidgetManager, appWidgetIds);
        Log.i("mw","onUpdate");
        //=======================只执行了一次时间显示================
        /*
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String time = sdf.format(new Date());

        RemoteViews rv = new RemoteViews(context.getPackageName(),R.layout.time_widget_layout);
        rv.setTextViewText(R.id.widget_layout_show_time,time);
        //这里只更新第一个widget实例
        appWidgetManager.updateAppWidget(appWidgetIds[0],rv);
        */
    }


    @Override
    public void onReceive(Context context, Intent intent) {
        super.onReceive(context, intent);
    }

    //创建同类型的实例只执行一次,即使后面再多次新增实例也不再执行
    @Override
    public void onEnabled(Context context) {
        super.onEnabled(context);
        Log.i("mw","首次新增onEnabled");
        context.startService(new Intent(context,WidgetServiceImpl.class));
    }

    //删除同类型的实例每删除一次就会执行一次
    @Override
    public void onDeleted(Context context, int[] appWidgetIds) {
        super.onDeleted(context, appWidgetIds);
        Log.i("mw","删除onDeleted");
    }

    //删除同类型的实例最后一个实例时，执行一次,意思是就只执行一次
    @Override
    public void onDisabled(Context context) {
        super.onDisabled(context);
        Log.i("mw","全部删除onDisabled");
        context.stopService(new Intent(context,WidgetServiceImpl.class));
    }
}

WidgetServiceImpl.java

package com.example.a20200712;

import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.ComponentName;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.RemoteViews;

import androidx.annotation.Nullable;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class WidgetServiceImpl extends Service {
    ScheduledExecutorService scheduledExecutorService;


    //点击事件
    @Override
    public void onCreate() {
        Log.i("mw","创建Service");
        super.onCreate();
        scheduledExecutorService = Executors.newScheduledThreadPool(1);
        scheduledExecutorService.scheduleWithFixedDelay(new Runnable() {
            @Override
            public void run() {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                String time = sdf.format(new Date());

                RemoteViews rv = new RemoteViews(getPackageName(),R.layout.time_widget_layout);
                rv.setTextViewText(R.id.widget_layout_show_time,time);

                PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(),1,new Intent(getApplicationContext(),MainActivity.class),0);
                rv.setOnClickPendingIntent(R.id.widget_layout_show_time,pendingIntent);

                AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(getApplicationContext());
                //这里更新所有widget同类型的实例
                appWidgetManager.updateAppWidget(new ComponentName(getApplicationContext(),WidgetActivity.class),rv);

            }
        },0,1000, TimeUnit.MILLISECONDS);
    }

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

    @Override
    public void onDestroy() {
        if(scheduledExecutorService!=null){

            scheduledExecutorService.shutdown();
            scheduledExecutorService = null;
            Log.i("mw","注消scheduledExecutorService");
        }
        super.onDestroy();
    }
}

res/layout/time_widget_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/widget_layout_show_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="23dp"
        android:text="显示时间"></TextView>
</LinearLayout>

res/xml/widget_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="300dp"
    android:minHeight="80dp"
    android:previewImage="@drawable/kf"
    android:initialLayout="@layout/time_widget_layout"
    android:widgetCategory="home_screen">
</appwidget-provider>

AndroidManifest.xml配置

这里的

<meta-data android:name="android.appwidget.provider" ---》这个是固定的必须写这个
    android:resource="@xml/widget_layout" />  ---》这个地方写你的widget配置

<receiver android:name=".WidgetActivity">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>
            <meta-data android:name="android.appwidget.provider"
                android:resource="@xml/widget_layout" />
        </receiver>

        <service android:name=".WidgetServiceImpl">
            <intent-filter>
                <action android:name="android.intent.action.DELETE" />
            </intent-filter>
        </service>

UI 方面大家自己再优化

Android应用小部件appwidget开发全部代码案例和说明

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