如何设置 Android 通知图标?
此示例演示如何设置 Android 通知图标
步骤 1 − 在 Android Studio 中创建一个新项目,进入文件 ⇒ 新项目,并填写所有必需的详细信息以创建一个新项目。
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" android :padding= "16dp" tools :context= ".MainActivity" > <Button android :id= "@+id/btnCreateNotification" android :layout_width= "0dp" android :layout_height= "wrap_content" android :text= "Create notification" app :layout_constraintBottom_toBottomOf= "parent" app :layout_constraintEnd_toEndOf= "parent" app :layout_constraintStart_toStartOf= "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 app.tutorialspoint.com.notifyme;
import android.app.NotificationManager;
import android.content.Context;
import android.support.v4.app.NotificationCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.util.Objects;
public class MainActivity extends AppCompatActivity {
private final static String default_notification_channel_id = "default";
@Override
protected void onCreate (Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout. activity_main );
Button btnCreateNotification = findViewById(R.id. btnCreateNotification );
btnCreateNotification.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick (View v) {
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity. this,
default_notification_channel_id )
.setSmallIcon(R.drawable. ic_launcher_foreground )
.setContentTitle( "Test" )
.setContentText( "Hello! This is my first push notification" ) ;
NotificationManager mNotificationManager = (NotificationManager)
getSystemService(Context. NOTIFICATION_SERVICE ) ;
mNotificationManager.notify( 1 , mBuilder.build()) ;
}
});
}
}步骤 4 − 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" > <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> </application> </manifest>
让我们尝试运行你的应用程序。我认为你已将你的真正 Android 移动设备与你的计算机相连接。要从 Android Studio 运行应用程序,打开项目的一个活动文件,然后从工具栏中单击运行
图标。选择你的移动设备作为选项,然后检查会显示你的默认屏幕的移动设备 –
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