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法律研究如何在Android工具栏图标中显示通知计数？
此示例演示如何在Android工具栏图标中显示通知计数。
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一个新项目。
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" > <Toolbar android :layout_width = "match_parent" android :layout_height = "?actionBarSize" android :background = "@color/colorPrimary" > <RelativeLayout android :layout_width = "match_parent" android :layout_height = "match_parent" android :layout_marginEnd = "16dp" > <TextView android :layout_width = "wrap_content" android :layout_height = "wrap_content" android :layout_centerVertical = "true" android :text = "Notify Me" android :textAppearance = "@style/Base.TextAppearance.AppCompat.Medium" android :textColor = "#FFF" android :textStyle = "bold" /> <RelativeLayout android :id = "@+id/notificationBadge" android :layout_width = "wrap_content" android :layout_height = "wrap_content" android :layout_alignParentEnd = "true" android :layout_centerVertical = "true" > <RelativeLayout android :id= "@+id/badgeLayout" android :layout_width = "wrap_content" android :layout_height = "wrap_content" android :paddingTop = "8dp" > <Button android :layout_width = "36dp" android :layout_height = "36dp" android :background = "@drawable/action_notification" /> </RelativeLayout> <TextView android :id = "@+id/tvBadgeNumber" android :layout_width = "wrap_content" android :layout_height = "wrap_content" android :layout_alignTop = "@+id/badgeLayout" android :layout_alignEnd = "@id/badgeLayout" android :background = "@drawable/item_count" android :text = "0" android :textColor = "#FFF" android :textSize = "16sp" android :textStyle = "bold" /> </RelativeLayout> </RelativeLayout> </Toolbar> <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src/MainActivity。
package app.tutorialspoint.com.notifyme ;
import android.app.NotificationChannel ;
import android.app.NotificationManager ;
import android.app.PendingIntent ;
import android.content.Intent ;
import android.os.Bundle ;
import android.support.v4.app.NotificationCompat ;
import android.support.v7.app.AppCompatActivity ;
import android.view.View ;
import android.widget.TextView ;
public class MainActivity extends AppCompatActivity {
public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
private final static String default_notification_channel_id = "default" ;
static int notificationCount = 0 ;
TextView tvBadgeNumber ;
@Override
protected void onCreate (Bundle savedInstanceState) {
super .onCreate(savedInstanceState) ;
setContentView(R.layout. activity_main ) ;
tvBadgeNumber = findViewById(R.id. tvBadgeNumber ) ;
}
public void createNotification (View view) {
Intent notificationIntent = new Intent(getApplicationContext() , MainActivity. class ) ;
notificationIntent.putExtra( "fromNotification" , true ) ;
notificationIntent.setFlags(Intent. FLAG_ACTIVITY_CLEAR_TOP | Intent. FLAG_ACTIVITY_SINGLE_TOP ) ;
PendingIntent pendingIntent = PendingIntent. getActivity ( this, 0 , notificationIntent , 0 ) ;
NotificationManager mNotificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE ) ;
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity. this, default_notification_channel_id ) ;
mBuilder.setContentTitle( "My Notification" ) ;
mBuilder.setContentIntent(pendingIntent) ;
mBuilder.setContentText( "Notification Listener Service Example" ) ;
mBuilder.setTicker( "Notification Listener Service Example" ) ;
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()) ;
notificationCount ++ ;
tvBadgeNumber .setText(String. valueOf ( notificationCount )) ;
}
}步骤 4 − 将以下代码添加到res/drawable/item_count.xml
<? xml version = "1.0" encoding = "utf-8" ?> <shape xmlns: android = "http://schemas.android.com/apk/res/android" android :shape = "rectangle" > <corners android :radius = "8dp" /> <solid android :color = "#2196F3" /> <stroke android :width = "1dip" android :color = "#FFF" /> <padding android :bottom = "2dp" android :left = "2dp" android :right = "2dp" android :top = "2dp" /> </shape>
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。我假设您已将实际的Android移动设备连接到计算机。要从Android Studio运行应用程序，请打开项目的一个activity文件，然后单击工具栏中的运行
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−
点击 此处 下载项目代码
更新于：2019年7月30日
575 次浏览
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