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法律研究如何在Android手机重启后保持状态栏通知持久显示？
本例演示了如何在Android手机重启后保持状态栏通知持久显示
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" android :padding = "16dp" tools :context = ".MainActivity" / >
步骤 3 − 将以下代码添加到src/MainActivity.java。
package app.tutorialspoint.com.notifyme ;
import android.os.Bundle ;
import android.support.v7.app.AppCompatActivity ;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate (Bundle savedInstanceState) {
super .onCreate(savedInstanceState) ;
setContentView(R.layout. activity_main ) ;
}
}步骤 4 − 将以下代码添加到src/USBStateReceiver.java。
package app.tutorialspoint.com.notifyme ;
import android.annotation. SuppressLint ;
import android.app.Notification ;
import android.app.NotificationChannel ;
import android.app.NotificationManager ;
import android.content.BroadcastReceiver ;
import android.content.Context ;
import android.content.Intent ;
import android.support.v4.app.NotificationCompat ;
import android.util.Log ;
public class USBStateReceiver extends BroadcastReceiver {
public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
private final static String default_notification_channel_id = "default" ;
boolean connected = true;
@SuppressLint ( "UnsafeProtectedBroadcastReceiver" )
@Override
public void onReceive (Context context , Intent intent) {
NotificationCompat.Builder builder = new NotificationCompat.Builder(context , default_notification_channel_id ) ;
builder.setContentTitle( "USB - Notification" ) ;
String action = intent.getAction() ;
Log. e ( "USB" , action) ;
assert action != null;
builder.setContentText( "Connected" ) ;
builder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
builder.setAutoCancel( true ) ;
builder.setChannelId( NOTIFICATION_CHANNEL_ID ) ;
Notification notification = builder.build() ;
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context. NOTIFICATION_SERVICE ) ;
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) ;
assert notificationManager != null;
notificationManager.createNotificationChannel(notificationChannel) ;
}
assert notificationManager != null;
if ( connected ) {
notificationManager.notify( 1 , notification) ;
connected = false;
} else {
notificationManager.cancel( 1 ) ;
connected = true;
}
}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" /> <uses-permission android :name = "android.permission.RECEIVE_BOOT_COMPLETED" /> <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> <receiver android :name = ".USBStateReceiver" > <intent-filter> <action android :name = "android.intent.action.BOOT_COMPLETED" /> </intent-filter> </receiver> <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，请打开项目中的一个活动文件，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 这里 下载项目代码
更新于：2020年7月3日
429 次浏览
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