如何在 Android 中实现展开和折叠通知?
本示例演示如何在 Android 中实现展开和折叠通知。
步骤 1 − 在 Android Studio 中新建一个项目,转到文件 ⇒ 新建项目,然后填写所有必需的详细信息以创建一个新项目。
步骤 2 − 将以下代码添加到 res/layout/activity_main.xml 中。
<? 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>
第 3 步 − 将以下代码添加到 src/MainActivity 中。
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 ; 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) { NotificationManager mNotificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE ) ; NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity. this, default_notification_channel_id ) ; mBuilder.setContentTitle( "Notify Me" ) ; mBuilder.setContentText(getResources().getString(R.string. lorem_ipsum )) ; mBuilder.setStyle( new NotificationCompat.BigTextStyle().bigText(getResources().getString(R.string. lorem_ipsum ))) ; 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 4 − 将以下代码添加到 AndroidManifest.xml 中
<? 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>
让我们尝试运行你的应用程序。我假设你已将实际的 Android 移动设备连接到你的计算机。要从 android studio 运行该应用,打开其中一个项目的活动文件,然后单击工具栏中的运行 图标。选择你的移动设备作为一个选项,然后检查你的移动设备,它将显示默认屏幕 −
点击 此处 下载项目代码
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