mediaPlayer错误-38,0

Question

我尝试做简单的在线广播播放器.这是流的地址http://radio-electron.ru:8000/96这是我的代码.

MyActivity.java

package com.example.untitled2;

import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.IOException;

public class MyActivity extends Activity {

    MediaPlayer mediaPlayer;
    Button playButton;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    @Override
    public void onStart() {
        super.onStart();
    }

    @Override
    public void onResume() {
        super.onResume();
        mediaPlayer = new MediaPlayer();
        playButton = (Button)findViewById(R.id.button);

        playButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(mediaPlayer.isPlaying())
                    mediaPlayer.stop();
                else {
                    try {

                        mediaPlayer.setDataSource(getApplicationContext(), Uri.parse("http://radio-electron.ru:8000/96"));
                        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                        mediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
                            @Override
                            public boolean onError(MediaPlayer mediaPlayer, int i, int i2) {
                                Toast.makeText(getApplicationContext(), "ERROR " + i, Toast.LENGTH_LONG).show();
                                playButton.setEnabled(false);
                                Log.d("radio", "error " + i + " " + i2);
                                return false;  //To change body of implemented methods use File | Settings | File Templates.
                            }
                        });
                        mediaPlayer.prepareAsync();
                    }
                    catch (IOException e) {
                        Toast.makeText(getApplicationContext(), "ERROR " + e, Toast.LENGTH_LONG).show();
                        Log.d("radio", "error " + e);
                    }
                    mediaPlayer.start();
                }
            }
        });
    }
}

main.xml中

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             android:orientation="vertical"
             android:layout_width="fill_parent"
             android:layout_height="fill_parent"
        >
    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="New Button"
            android:id="@+id/button"
            android:layout_gravity="center"/>
</FrameLayout>

我不知道,为什么我得到 - (38,0)代码,它是什么意思.我使用Intellij IDEA并在Android 2.3和4.2模拟器上尝试此代码并遇到一些问题.

Answer 1

-38引用errno.h中的ENOSYS错误代码(请参阅此解释/sf/answers/1064441591/)

你似乎试着在准备工作完成之前开始比赛.使用该 setOnPreparedListener()方法设置准备侦听器并start()仅在准备完成后调用该方法.

mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
  public void onPrepared(MediaPlayer mp) {
      mp.start();
  }
});
mediaPlayer.prepareAsync();

并mediaPlayer.start()从代码中删除当前调用.

Answer 2

我在准备之前-38通过调用getDuration();MediaPlayer来收到我的错误.

值得检查MediaPlayer文档.

有一段开头 It is a programming error to invoke methods such as getCurrentPosition()...

它有一个方法列表,这些方法在准备MediaPlayer之前调用是不理想的,这反过来可能导致-38.