如何在Android中使用NotificationCompat.Builder创建通知?
在深入了解NotificationCompact.Builder之前,我们应该了解Android中的通知是什么。通知就像在操作栏上显示系统消息一样,就像下面显示的未接来电通知。
此示例演示如何集成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"?> <android.support.constraint.ConstraintLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:app = "http://schemas.android.com/apk/res-auto" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".MainActivity"> <Button android:id = "@+id/button" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "Click" app:layout_constraintBottom_toBottomOf = "parent" app:layout_constraintLeft_toLeftOf = "parent" app:layout_constraintRight_toRightOf = "parent" app:layout_constraintTop_toTopOf = "parent" /> </android.support.constraint.ConstraintLayout>
步骤3 - 将以下代码添加到src/MainActivity.java
package com.example.andy.myapplication; import android.annotation.SuppressLint; import android.app.Notification; import android.app.NotificationChannel; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.graphics.BitmapFactory; import android.graphics.Color; import android.os.Build; import android.support.annotation.RequiresApi; import android.support.v4.app.NotificationCompat; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Switch; import android.widget.Toast; public class MainActivity extends AppCompatActivity implements View.OnClickListener { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button=findViewById(R.id.button); button.setOnClickListener(this); } @RequiresApi(api = Build.VERSION_CODES.O) @Override public void onClick(View v) { switch (v.getId()) { case R.id.button: notificationDialog(); break; } } @RequiresApi(api = Build.VERSION_CODES.O) private void notificationDialog() { NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); String NOTIFICATION_CHANNEL_ID = "tutorialspoint_01"; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { @SuppressLint("WrongConstant") NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "My Notifications", NotificationManager.IMPORTANCE_MAX); // Configure the notification channel. notificationChannel.setDescription("Sample Channel description"); notificationChannel.enableLights(true); notificationChannel.setLightColor(Color.RED); notificationChannel.setVibrationPattern(new long[]{0, 1000, 500, 1000}); notificationChannel.enableVibration(true); notificationManager.createNotificationChannel(notificationChannel); } NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID); notificationBuilder.setAutoCancel(true) .setDefaults(Notification.DEFAULT_ALL) .setWhen(System.currentTimeMillis()) .setSmallIcon(R.mipmap.ic_launcher) .setTicker("Tutorialspoint") //.setPriority(Notification.PRIORITY_MAX) .setContentTitle("sample notification") .setContentText("This is sample notification") .setContentInfo("Information"); notificationManager.notify(1, notificationBuilder.build()); } }
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,请打开您的项目中的一个活动文件,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
现在点击上面的按钮,您将得到如下所示的输出
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