移动平台开发音乐播放出现了问题

Question

土司可以正常显示 但没有声音 且添加的正在播放的日志没有正常输出

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.SMSMusic"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".SmsReceiver"
            android:exported="true">
            <intent-filter>
                <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
            </intent-filter>
        </receiver>
    </application>
    <uses-feature
        android:name="android.hardware.telephony"
        android:required="false" />
    <uses-permission android:name="android.permission.RECEIVE_SMS"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WAKE_LOCK"/>
</manifest>
package com.example.smsmusic;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private Button btnStop;
    private boolean isCast; //是否为广播激活

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECEIVE_SMS) != PackageManager.PERMISSION_GRANTED){
            ActivityCompat.requestPermissions(this,new String[]{"android.permission.RECEIVE_SMS"},1);
        }
        btnStop=findViewById(R.id.btnStop);
        Intent intent = getIntent(); //获取广播意图对象
        isCast = intent.getBooleanExtra("iscast", false);  //默认值为false
        btnStop.setEnabled(isCast);   //设置停止按钮可用和单击监听
        if(isCast) Toast.makeText(this, "正在播放音乐...", Toast.LENGTH_SHORT).show();
        btnStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v){
                //显式服务调用意图（非绑定式）
                Intent intent=new Intent(MainActivity.this,MyAudioService.class);
                //在Activity组件里，停止音乐播放服务
                stopService(intent);
                finish();  //销毁本活动
            }
        });
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode){
            case 1:
                if(grantResults[0]!=PackageManager.PERMISSION_GRANTED){
                    Toast.makeText(this, "未授权，无法实现预定的功能！", Toast.LENGTH_SHORT).show();
                    finish();
                }else{
                    Toast.makeText(this, "请发一条短信验证...", Toast.LENGTH_SHORT).show();
                }
        }
    }
}

package com.example.smsmusic;


import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.util.Log;

import java.io.IOException;

public class MyAudioService extends Service {
    private final String TAG="music";
    MediaPlayer mediaPlayer;
    public MyAudioService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        //throw new UnsupportedOperationException("Not yet implemented");
        return null;
    }

    public void onCreate() {
//        mediaPlayer  = MediaPlayer.create(this,R.raw.start);
//        mediaPlayer.start();
//        Log.i(TAG,"正在播放");
        mediaPlayer = new MediaPlayer();
        try {
            mediaPlayer.setDataSource(getResources().openRawResourceFd(R.raw.start).getFileDescriptor());
            mediaPlayer.prepare();
            mediaPlayer.start();
            Log.i(TAG, "正在播放");
        } catch (IOException e) {
            e.printStackTrace();
        }


    }
    @Override
    public void onDestroy() {
        mediaPlayer.stop();
    }
}

package com.example.smsmusic;


import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class SmsReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
        //throw new UnsupportedOperationException("Not yet implemented");
        Intent serviceIntent = new Intent(context, MyAudioService.class);
        //在广播组件里，通过上下文对象启动音乐播放服务组件
        context.startService(serviceIntent);

        //新建调用Activity组件的意图
        Intent activityIntent = new Intent(context, MainActivity.class);
        activityIntent.putExtra("iscast", true);  //携带数据
        //新建栈用来存放被启动的Activity（当已经存在时，只做移动处理）
        activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        //在广播组件里，通过上下文对象启动Activity组件
        context.startActivity(activityIntent);
    }
}


土司可以正常显示 但没有声音且添加的日志Log.i(TAG, "正在播放");没有正常输出

Answer 1

MyAudioService服务都没有在AndroidManifest.xml中声明