【问题标题】：Launch another app from android 11 widget?从 android 11 小部件启动另一个应用程序？
【发布时间】：2021-09-23 20:23:32
【问题描述】：

我无法在 android 11 上启动小部件。

此代码适用于我的 android 9 手机，但 android 11 Google Pixel 3a 模拟器无法正常工作。我该怎么做。好的，所以我想做的是创建一个小部件，当小部件被按下时，它会简单地启动另一个应用程序。

小部件 XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:text="Whatsapp Launch"
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </Button>

    <Button
        android:layout_marginLeft="30dp"
        android:text="Spotify Launch"
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </Button>
    

</LinearLayout>

小部件类

class SimpleAppWidget : AppWidgetProvider() {

    override fun onUpdate(
        context: Context,
        appWidgetManager: AppWidgetManager,
        appWidgetIds: IntArray
    ) {
        // There may be multiple widgets active, so update all of them
        for (appWidgetId in appWidgetIds) {
            updateAppWidget(context, appWidgetManager, appWidgetId)
        }
    }

    private fun updateAppWidget(
        context: Context, appWidgetManager: AppWidgetManager,
        appWidgetId: Int
    ) {

        // Construct the RemoteViews object
        val views = RemoteViews(context.packageName, R.layout.simple_app_widget)
        // Construct an Intent object includes web adresss.

        val launchIntent12 = context!!.packageManager.getLaunchIntentForPackage("com.spotify.music")
        val launchIntent122 = context!!.packageManager.getLaunchIntentForPackage("com.whatsapp")
        // In widget we are not allowing to use intents as usually. We have to use PendingIntent instead of 'startActivity'
        val pendingIntent = PendingIntent.getActivity(context, 0, launchIntent122, 0)
        val pendingIntent2 = PendingIntent.getActivity(context, 0, launchIntent12, 0)
        // Here the basic operations the remote view can do.
        views.setOnClickPendingIntent(R.id.button, pendingIntent)
        views.setOnClickPendingIntent(R.id.button2, pendingIntent2)
        // Instruct the widget manager to update the widget
        appWidgetManager.updateAppWidget(appWidgetId, views)
    }

}

【问题讨论】：

标签： java android android-studio kotlin android-widget

【解决方案1】：

首先，您需要添加package visibility rules to your manifest。就目前而言，getLaunchIntentForPackage() 可能会返回null。解决此问题后，请完全卸载并重新安装应用程序，然后再继续。

还有：

为您的 PendingIntent 对象使用唯一 ID（它们都在 getActivity() 的第二个参数中为 0 设置）
考虑使用PendingIntent.FLAG_UPDATE_CURRENT 作为getActivity() 的第四个参数

【讨论】：

我应用了您的反馈并再次运行它，但 android 11 仍然无法运行。

【解决方案2】：

小部件活动

  class SimpleAppWidget : AppWidgetProvider() {

override fun onUpdate(
    context: Context,
    appWidgetManager: AppWidgetManager,
    appWidgetIds: IntArray
) {
    // There may be multiple widgets active, so update all of them
    for (appWidgetId in appWidgetIds) {
        updateAppWidget(context, appWidgetManager, appWidgetId)
    }
}

@SuppressLint("RemoteViewLayout")
private fun updateAppWidget(
    context: Context, appWidgetManager: AppWidgetManager,
    appWidgetId: Int
) {

    // Construct the RemoteViews object
    val views = RemoteViews(context.packageName, R.layout.simple_app_widget)
    val launchIntent2 = context!!.packageManager.getLaunchIntentForPackage("com.spotify.music")
    val pendingIntent2 = PendingIntent.getActivity(context, 1, launchIntent2, PendingIntent.FLAG_UPDATE_CURRENT)
    views.setOnClickPendingIntent(R.id.button2, pendingIntent2)

    appWidgetManager.updateAppWidget(appWidgetId, views)
}

【讨论】：

【解决方案3】：

小部件权限

<queries>
    <package android:name="com.spotify.music"/>
    <package android:name="com.example.widget11" />
    <intent>
        <action android:name="com.spotify.music" />
    </intent>
</queries>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.Widget11">
    <receiver android:name=".SimpleAppWidget">
        <intent-filter>
            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        </intent-filter>

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

    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

【讨论】：