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法律研究如何在Android中创建每天特定时间发送的通知？
此示例演示了如何在Android中创建每天特定时间发送的通知
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" > <TextView android :id = "@+id/tvDate" android :layout_width = "match_parent" android :layout_height = "wrap_content" android :hint = "Select Date" android :onClick = "setDate" android :padding = "16dp" /> </RelativeLayout>
步骤 3 − 将以下代码添加到src/MainActivity中。
package app.tutorialspoint.com.notifyme ;
import android.app.AlarmManager ;
import android.app.DatePickerDialog ;
import android.app.Notification ;
import android.app.PendingIntent ;
import android.content.Context ;
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.Button ;
import android.widget.DatePicker ;
import java.text.SimpleDateFormat ;
import java.util.Calendar ;
import java.util.Date ;
import java.util.Locale ;
public class MainActivity extends AppCompatActivity {
public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
private final static String default_notification_channel_id = "default" ;
Button btnDate ;
final Calendar myCalendar = Calendar. getInstance () ;
@Override
protected void onCreate (Bundle savedInstanceState) {
super .onCreate(savedInstanceState) ;
setContentView(R.layout. activity_main ) ;
btnDate = findViewById(R.id. btnDate ) ;
}
private void scheduleNotification (Notification notification , long delay) {
Intent notificationIntent = new Intent( this, MyNotificationPublisher. class ) ;
notificationIntent.putExtra(MyNotificationPublisher. NOTIFICATION_ID , 1 ) ;
notificationIntent.putExtra(MyNotificationPublisher. NOTIFICATION , notification) ;
PendingIntent pendingIntent = PendingIntent. getBroadcast ( this, 0 , notificationIntent , PendingIntent. FLAG_UPDATE_CURRENT ) ;
AlarmManager alarmManager = (AlarmManager) getSystemService(Context. ALARM_SERVICE ) ;
assert alarmManager != null;
alarmManager.set(AlarmManager. ELAPSED_REALTIME_WAKEUP , delay , pendingIntent) ;
}
private Notification getNotification (String content) {
NotificationCompat.Builder builder = new NotificationCompat.Builder( this, default_notification_channel_id ) ;
builder.setContentTitle( "Scheduled Notification" ) ;
builder.setContentText(content) ;
builder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
builder.setAutoCancel( true ) ;
builder.setChannelId( NOTIFICATION_CHANNEL_ID ) ;
return builder.build() ;
}
DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet (DatePicker view , int year , int monthOfYear , int dayOfMonth) {
myCalendar .set(Calendar. YEAR , year) ;
myCalendar .set(Calendar. MONTH , monthOfYear) ;
myCalendar .set(Calendar. DAY_OF_MONTH , dayOfMonth) ;
updateLabel() ;
}
} ;
public void setDate (View view) {
new DatePickerDialog(MainActivity. this, date ,
myCalendar .get(Calendar. YEAR ) ,
myCalendar .get(Calendar. MONTH ) ,
myCalendar .get(Calendar. DAY_OF_MONTH )
).show() ;
}
private void updateLabel () {
String myFormat = "dd/MM/yy" ; //In which you need put here
SimpleDateFormat sdf = new SimpleDateFormat(myFormat , Locale. getDefault ()) ;
Date date = myCalendar .getTime() ;
btnDate .setText(sdf.format(date)) ;
scheduleNotification(getNotification( btnDate .getText().toString()) , date.getTime()) ;
}
}步骤 4 − 将以下代码添加到src/MyNotificationPublisher中。
package app.tutorialspoint.com.notifyme ;
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 static app.tutorialspoint.com.notifyme.MainActivity. NOTIFICATION_CHANNEL_ID ;
public class MyNotificationPublisher extends BroadcastReceiver {
public static String NOTIFICATION_ID = "notification-id" ;
public static String NOTIFICATION = "notification" ;
public void onReceive (Context context , Intent intent) {
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context. NOTIFICATION_SERVICE ) ;
Notification notification = intent.getParcelableExtra( NOTIFICATION ) ;
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) ;
}
int id = intent.getIntExtra( NOTIFICATION_ID , 0 ) ;
assert notificationManager != null;
notificationManager.notify(id , notification) ;
}
}步骤 5 − 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> <receiver android :name= ".MyNotificationPublisher" /> </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电脑。要从Android Studio运行应用程序，请打开您的项目活动文件之一，然后点击工具栏中的运行
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
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