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法律研究如何從廣播接收器啟動和停止 Android 通知？
此示例演示瞭如何從廣播接收器啟動和停止 Android 通知
步驟 1 - 在 Android Studio 中建立一個新專案，轉到檔案 ⇒ 新建專案，並填寫所有必需的詳細資訊以建立新專案。
步驟 2 - 將以下程式碼新增到 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" android :padding = "16dp" tools :context = ".MainActivity" / >
步驟 3 - 將以下程式碼新增到 src/MainActivity 中。
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 ) ;
}
}步驟 4 - 將以下程式碼新增到 src/USBStateReceiver 中
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;
}
}
}步驟 5 - 將以下程式碼新增到 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" /Gt; <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.hardware.usb.action.USB_STATE" /> </intent-filter> </receiver> </application> </manifest>
讓我們嘗試執行您的應用程式。我假設您已將您的實際 Android 移動裝置連線到您的計算機。要從 Android Studio 執行應用程式，請開啟您的專案之一的活動檔案，然後單擊工具欄中的執行 
圖示。選擇您的移動裝置作為選項，然後檢查您的移動裝置，它將顯示您的預設螢幕 -
點選 此處 下載專案程式碼
更新於： 2019 年 7 月 30 日
582 次檢視
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