Androidで通知の背景色を変更するにはどうすればよいですか？

この例は、Android通知でテキストコンテンツをマーキーする方法について示しています。

ステップ1 − Android Studioで新しいプロジェクトを作成し、[ファイル]⇒[新しいプロジェクト]に移動して、新しいプロジェクトを作成するために必要なすべての詳細を入力します。

ステップ2 −次のコードをres / layout/activity_main.xmlに追加します。

<? xml version = "1.0" encoding = "utf-8" ?>
<RelativeLayout xmlns: android = "https://schemas.android.com/apk/res/android"
   xmlns: tools = "https://schemas.android.com/tools"
   android :layout_width = "match_parent"
   android :layout_height = "match_parent"
   tools :context = ".MainActivity" >
   <Button
      android :layout_width = "match_parent"
      android :layout_height = "wrap_content"
      android :layout_centerInParent = "true"
      android :layout_margin = "16dp"
      android :onClick = "createNotification"
      android :text = "create notification" />
</RelativeLayout>

ステップ3 −次のコードをres / layout/custom_notification_layout.xmlに追加します。

<? xml version = "1.0" encoding = "utf-8" ?>
<RelativeLayout xmlns: android = "https://schemas.android.com/apk/res/android"
   android :id = "@+id/layout"
   android :layout_width = "fill_parent"
   android :layout_height = "64dp"
   android :background = "@color/colorAccent"
   android :padding = "10dp" >
   <ImageView
      android :id = "@+id/image"
      android :layout_width = "wrap_content"
      android :layout_height = "fill_parent"
      android :layout_alignParentStart = "true"
      android :layout_marginEnd = "10dp"
      android :contentDescription = "@string/app_name"
      android :src = "@mipmap/ic_launcher" />
   <TextView
      android :id = "@+id/title"
      android :layout_width = "wrap_content"
      android :layout_height = "wrap_content"
      android :layout_toEndOf = "@id/image"
      android :text = "Testing"
      android :textColor = "#000"
      android :textSize = "13sp" />
   <TextView
      android :id = "@+id/text"
      android :layout_width = "wrap_content"
      android :layout_height = "wrap_content"
      android :layout_below = "@id/title"
      android :layout_toEndOf = "@id/image"
      android :ellipsize = "marquee"
      android :singleLine = "true"
      android :text = "Lorem Ipsum is simply dummy text of the printing and typesetting
         industry. Lorem Ipsum has been the industry's standard dummy text ever since the
         1500s, when an unknown printer took a galley of type and scrambled it to make a type
         specimen book. It has survived not only five centuries, but also the leap into
         electronic typesetting, remaining essentially unchanged. It was popularised in the
         1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more
         recently with desktop publishing software like Aldus PageMaker including versions of
         Lorem Ipsum. "
   android :textColor = "#000"
   android :textSize = "13sp" />
</RelativeLayout>

ステップ4 −次のコードをsrc/MainActivityに追加します。

package app.tutorialspoint.com.notifyme ;
import android.app.NotificationChannel ;
import android.app.NotificationManager ;
import android.os.Bundle ;
import android.support.v4.app.NotificationCompat ;
import android.support.v7.app.AppCompatActivity ;
import android.view.View ;
import android.widget.RemoteViews ;
public class MainActivity extends AppCompatActivity {
   public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
   private final static String default_notification_channel_id = "default" ;
   @Override
   protected void onCreate (Bundle savedInstanceState) {
      super .onCreate(savedInstanceState) ;
      setContentView(R.layout. activity_main ) ;
   }
   public void createNotification (View view) {
      RemoteViews contentView = new RemoteViews(getPackageName() , R.layout. custom_notification_layout ) ;
      NotificationManager mNotificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE ) ;
      NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity. this, default_notification_channel_id ) ;
      mBuilder.setContent(contentView) ;
      mBuilder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
      mBuilder.setAutoCancel( true ) ;
      if (android.os.Build.VERSION. SDK_INT > = android.os.Build.VERSION_CODES. O ) {
         int importance = NotificationManager. IMPORTANCE_HIGH ;
         NotificationChannel notificationChannel = new NotificationChannel( NOTIFICATION_CHANNEL_ID , "NOTIFICATION_CHANNEL_NAME" , importance) ;
         mBuilder.setChannelId( NOTIFICATION_CHANNEL_ID ) ;
         assert mNotificationManager != null;
         mNotificationManager.createNotificationChannel(notificationChannel) ;
      }
      assert mNotificationManager != null;
      mNotificationManager.notify(( int ) System. currentTimeMillis () ,
      mBuilder.build()) ;
   }
}

ステップ5 −次のコードをAndroidManifest.xmlに追加します

<? xml version = "1.0" encoding = "utf-8" ?>
<manifest xmlns: android = "https://schemas.android.com/apk/res/android"
   package = "app.tutorialspoint.com.notifyme" >
   <uses-permission android :name = "android.permission.VIBRATE" />
   <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/AppTheme" >
      <activity android :name = ".MainActivity" >
         <intent-filter>
            <action android :name = "android.intent.action.MAIN" />
            <category android :name = "android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

アプリケーションを実行してみましょう。実際のAndroidモバイルデバイスをコンピューターに接続していると思います。 android studioからアプリを実行するには、プロジェクトのアクティビティファイルの1つを開き、ツールバーの[実行]アイコンをクリックします。オプションとしてモバイルデバイスを選択し、デフォルトの画面を表示するモバイルデバイスを確認します-