RemoteView(kotlin)-效果

自定义桌面小组件

1. 定义组件的布局样式widget_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:id="@+id/widget_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Widget"
        android:textSize="18sp" />

    <Button
        android:id="@+id/widget_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Update" />
</LinearLayout>

2. MyWidgetProvider,需要继承自AppWidgetProvider

package com.example.kotlinlearn.RemoteView

import android.app.PendingIntent
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 com.example.kotlinlearn.R
import java.util.Random

class MyWidgetProvider : AppWidgetProvider() {
    override fun onUpdate(
        context: Context,
        appWidgetManager: AppWidgetManager,
        appWidgetIds: IntArray
    ) {
        for (appWidgetId in appWidgetIds) {
            val views = RemoteViews(context.packageName, R.layout.widget_layout)
            val intent = Intent(context, MyWidgetProvider::class.java)
            intent.setAction(BUTTON_CLICKED)
            val pendingIntent = PendingIntent.getBroadcast(
                context,
                0,
                intent,
                PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
            )
            views.setOnClickPendingIntent(R.id.widget_button, pendingIntent)
            appWidgetManager.updateAppWidget(appWidgetId, views)
        }
    }

    override fun onReceive(context: Context, intent: Intent) {
        super.onReceive(context, intent)
        if (BUTTON_CLICKED == intent.action) {
            val appWidgetManager = AppWidgetManager.getInstance(context)
            val views = RemoteViews(context.packageName, R.layout.widget_layout)
            views.setTextViewText(R.id.widget_text, "Updated!" + Random().nextInt())
            val componentName = ComponentName(context, MyWidgetProvider::class.java)
            appWidgetManager.updateAppWidget(componentName, views)
        }
    }

    companion object {
        private const val BUTTON_CLICKED = "com.example.BUTTON_CLICKED"
    }
}

3. 在res/xml下创建组件的属性文件my_widget_info.xml，包括大小等值

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="125dp"
    android:minHeight="50dp"
    android:updatePeriodMillis="86400000"
    android:initialLayout="@layout/widget_layout" />

4. 在manifest中配置receiver，与activity同级

        <receiver android:name=".RemoteView.MyWidgetProvider" android:exported="true">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/my_widget_info" />
        </receiver>