如何在Android中更改通知背景颜色？

此示例演示了如何在Android通知中显示跑马灯文本内容。

步骤 1 − 在Android Studio中创建一个新项目，转到文件 ⇒ 新建项目，并填写所有必需的详细信息以创建新项目。

步骤 2 − 将以下代码添加到res/layout/activity_main.xml。

<? 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 = "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>

步骤 3 − 将以下代码添加到res/layout/custom_notification_layout.xml。

<? xml version = "1.0" encoding = "utf-8" ?>
<RelativeLayout xmlns: android = "http://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>

步骤 4 − 将以下代码添加到src/MainActivity。

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()) ;
   }
}

步骤 5 − 将以下代码添加到AndroidManifest.xml

<? xml version = "1.0" encoding = "utf-8" ?>
<manifest xmlns: android = "http://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>

让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要从Android Studio运行应用程序，请打开您的项目中的一个activity文件，然后单击运行工具栏中的图标。选择您的移动设备作为选项，然后检查您的移动设备，它将显示您的默认屏幕 −