每五分钟显示 Android 通知?
此示例演示如何每五分钟显示一次 Android 通知
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" > <Button android :layout_width = "match_parent" android :layout_height = "wrap_content" android :layout_centerInParent = "true" android :onClick = "closeApp" android :text = "close App for notification" /> </RelativeLayout>
步骤 3 − 将以下代码添加到 src/MainActivity
package app.tutorialspoint.com.notifyme ; import android.content.Intent ; import android.os.Bundle ; import android.support.v7.app.AppCompatActivity ; import android.view.View ; public class MainActivity extends AppCompatActivity { @Override protected void onCreate (Bundle savedInstanceState) { super .onCreate(savedInstanceState) ; setContentView(R.layout. activity_main ) ; } @Override protected void onStop () { super .onStop() ; startService( new Intent( this, NotificationService. class )) ; } public void closeApp (View view) { finish() ; } }
步骤 4 − 将以下代码添加到 src/NotificationService
package app.tutorialspoint.com.notifyme ; import android.app.NotificationChannel ; import android.app.NotificationManager ; import android.app.Service ; import android.content.Intent ; import android.os.Handler ; import android.os.IBinder ; import android.support.v4.app.NotificationCompat ; import android.util.Log ; import java.util.Timer ; import java.util.TimerTask ; public class NotificationService extends Service { public static final String NOTIFICATION_CHANNEL_ID = "10001" ; private final static String default_notification_channel_id = "default" ; Timer timer ; TimerTask timerTask ; String TAG = "Timers" ; int Your_X_SECS = 5 ; @Override public IBinder onBind (Intent arg0) { return null; } @Override public int onStartCommand (Intent intent , int flags , int startId) { Log. e ( TAG , "onStartCommand" ) ; super .onStartCommand(intent , flags , startId) ; startTimer() ; return START_STICKY ; } @Override public void onCreate () { Log. e ( TAG , "onCreate" ) ; } @Override public void onDestroy () { Log. e ( TAG , "onDestroy" ) ; stopTimerTask() ; super .onDestroy() ; } //we are going to use a handler to be able to run in our TimerTask final Handler handler = new Handler() ; public void startTimer () { timer = new Timer() ; initializeTimerTask() ; timer .schedule( timerTask , 500000 , Your_X_SECS * 1000 ) ; } public void stopTimerTask () { if ( timer != null ) { timer .cancel() ; timer = null; } } public void initializeTimerTask () { timerTask = new TimerTask() { public void run () { handler .post( new Runnable() { public void run () { createNotification() ; } }) ; } } ; } private void createNotification () { NotificationManager mNotificationManager = (NotificationManager)getSystemService( NOTIFICATION_SERVICE ) ; NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext() , default_notification_channel_id ) ; mBuilder.setContentTitle( "My Notification" ) ; 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()) ; } }
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> <service android :name = ".NotificationService" android :label = "@string/app_name" > <intent-filter> <action android :name = "app.tutorialspoint.com.notifyme.NotificationService" /> <category android :name = "android.intent.category.DEFAULT" /> </intent-filter> </service> </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 −
点击 此处 下载项目代码
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