今在Android Studio中使用Notification进行消息推送时,点击消息推送按钮后APP并没有进行消息推送,查看Logcat出现Failed to create image decoder with message 'unimplemented'(使用华为P30 pro真机测试):
其中MainActivity.java中代码如下:
package com.example.notificationtest;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.NotificationCompat;
import android.app.Notification;
import android.app.NotificationManager;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button sendNotice=(Button)findViewById(R.id.send_notice);
sendNotice.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.send_notice:
NotificationManager manager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);//NotificationManager实例对通知进行管理
Notification notification= new NotificationCompat.Builder(this)
.setContentTitle("This is content title")
.setContentText("This is content text")
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
.build();
Uri soundUri=Uri.fromFile(new File("/system/media/audio/notificationTest/Simple.ogg"));
//notification.sound=soundUri;
notification.ledARGB= Color.GREEN;//控制通知的led灯颜色
notification.ledOnMS=1000;//通知灯的显示时间
notification.ledOffMS=1000;
notification.flags=Notification.FLAG_SHOW_LIGHTS;
manager.notify(1,notification);//调用NotificationManager的notify方法使通知显示
break;
default:
break;
}
}
}
activity_main.xml中代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/send_notice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send notice"
android:layout_gravity="center_vertical|center_horizontal"/>
</LinearLayout>
经过在网上查阅资料,解决方案记录如下:
1、通过使用Log.d()查看了manager和bitmap是否为null,发现bitmap为null,说明BitmapFactory.decoderResource图像解码存在问题,我们将ic_launch图片重命名后再次运行,发现还是无法推送消息。
Bitmap bitmap=BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher);
Log.d("MainActivity",String.valueOf((bitmap==null)));
Log.d("MainActivity",String.valueOf((manager==null)));
据查阅网上资料,知晓该android版本需要手动添加NotificationChannel实现,则在manager.notify前添加如下代码:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel notificationChannel = new NotificationChannel("AppTestNotificationId", "AppTestNotificationName", NotificationManager.IMPORTANCE_DEFAULT);
manager.createNotificationChannel(notificationChannel);
notification.setChannelId("AppTestNotificationId");
}
即可解决问题,这时系统通知栏即显示通知。