要在Android设备上实现应用徽章图标的推送通知,你可以使用Notification Badges库。以下是一个实现的代码示例:
implementation 'androidx.core:core:1.1.0'
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private static final String CHANNEL_ID = "notification_channel";
private static final int NOTIFICATION_ID = 1;
private NotificationManager notificationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
createNotificationChannel();
// 模拟收到新消息的情况
showNotificationBadge();
}
private void createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, "Notification Channel", NotificationManager.IMPORTANCE_DEFAULT);
channel.setDescription("Channel description");
notificationManager.createNotificationChannel(channel);
}
}
private void showNotificationBadge() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
// 检查是否有通知徽章权限
if (notificationManager.getNotificationChannel(CHANNEL_ID).getImportance() < NotificationManager.IMPORTANCE_HIGH) {
// 没有权限,打开设置页面进行授权
Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS);
intent.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName());
intent.putExtra(Settings.EXTRA_CHANNEL_ID, CHANNEL_ID);
startActivity(intent);
Toast.makeText(this, "请授予通知徽章权限", Toast.LENGTH_SHORT).show();
} else {
// 有权限,显示通知徽章
Notification notification = new Notification.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("New Message")
.setContentText("You have a new message")
.setNumber(1) // 设置通知徽章的数量
.build();
notificationManager.notify(NOTIFICATION_ID, notification);
}
}
}
}
notification_icon.png
的图标,用作通知的小图标。这样,当你的应用收到新消息时,会在应用图标上显示一个徽章图标,表示有未读消息。如果用户点击徽章图标,会跳转到你的应用。请记得在AndroidManifest.xml文件中声明MainActivity。