如何在 Android 中播放 Base 64 编码的音频

Question

我正在尝试在 Android 中播放一些 base 64 编码的音频，并且我已经按照各种示例提出了以下代码：

MediaPlayer soundPlayer = new MediaPlayer();

try {
    soundPlayer.setDataSource(audioData);

    soundPlayer.setOnCompletionListener(new OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {
            mp.stop();
            mp.release();
        }
    });

    soundPlayer.prepare();
    soundPlayer.setVolume(100f, 100f);
    soundPlayer.setLooping(false);
    soundPlayer.start();
} 
catch (Exception e) {
    .
    .
    .
}

当这段代码执行时，我只是得到静默 - 并出现以下错误：

08-24 11:38:58.555: W/System.err(18862): java.io.IOException: 准备 失败。：状态=0x1 08-24 11：38：58.555：W/System.err（18862）：在 android.media.MediaPlayer.prepare（本机方法）08-24 11:38:58.555： W / System.err（18862）：在 application.main.Application$27.run(Application.java:233)

如果有人能指出我哪里出错了，我将不胜感激。有问题的“audioData”变量（如果你设法解码并播放它，描述了我的挫败感）如下：

数据：应用/八位字节流;的base64，GkXfo59ChoEBQveBAULygQRC84EIQoKEd2VibUKHgQRChYECGFOAZwH ///////// FUmpZpkq17GDD0JATYCGQ2hyb21lV0GGQ2hyb21lFlSua7 + uvdeBAXPFh + LZ / IvV7yqDgQKGhkFfT1BVU2Oik09wdXNIZWFkAQEAAIC7AAAAAADhjbWERzuAAJ + BAWJkgSAfQ7Z1Af ///////// ngQCjQZSBAACA + 4O1bX7U7Fau4djaow6 / qEcFOx2D6vgdTWqanSWTXXa4MzJRsP2c4GEeQwl5 / cRiYFl3QmBVeh8n5mGhkgidhLFrDoCIMEJBptK5vggcJl5zwHJSDWDOFwrI / RRvrygpr + L + fHCQ8vnKQfn6W + U1MYhPc4u / xVkm4pp1qsZTyEXM3SQLnlOPNR5Lrp0q7lSyiezMrJ9JpcC3GBB4PrxIhyN09K7iyACAS3gPH1J3dmCt1JDNkJ / hpZRRU2mEPBC / ooXsqZ24Znqkr4XqmHfybYX0tEu5iTz7gngLbxiyPPEfcKYKpwAljaLLjOINVSna8jmkulRVNOIJ1edk2pGnwP5 + FHU / 5mia2w3sniEBjvBS5W2WiXOU40qYCG + 0LY7 + WmFFAovpUddWzC1Jv5T6HpmLELnSYojoC6QKC8ECn8m7y0L9EIoMGkDH04Fk6l359StgSGpqqp1BVhCiMHzebvOM4pRXDzLJdCsYi3WFQfWf + ojKKZixVh3iuDDaKJqhxio5xBmXH / SDTlwQedAL06NBeIEAPID7g3J / UCJbxeOHYWvJS3wNcvuxbIec2FaOSbdQcvHzwSskKKkvECoM9Jfm1LAAQx0DP55dIkNIPZlJ73xEkG5O + 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Answer 1

在Android中播放Base64编码音频的示例代码：

 public class MainActivity extends AppCompatActivity {
    Button button;
    String 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";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button=findViewById(R.id.btnId);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                playMedia();
            }
        });
    }

    public void playMedia() {
        try{
            String url = "data:audio/mp3;base64,"+base64FormattedString;
            MediaPlayer mediaPlayer = new MediaPlayer();

            try {
                mediaPlayer.setDataSource(url);
                mediaPlayer.prepareAsync();
                mediaPlayer.setVolume(100f, 100f);
                mediaPlayer.setLooping(false);
            } catch (IllegalArgumentException e) {
                Toast.makeText(getApplicationContext(), "You might not set the DataSource correctly!", Toast.LENGTH_LONG).show();
            } catch (SecurityException e) {
                Toast.makeText(getApplicationContext(), "You might not set the DataSource correctly!", Toast.LENGTH_LONG).show();
            } catch (IllegalStateException e) {
                Toast.makeText(getApplicationContext(), "You might not set the DataSource correctly!", Toast.LENGTH_LONG).show();
            } catch (IOException e) {
                e.printStackTrace();
            }

            mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer player) {
                    player.start();
                }
            });

            mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mp) {
                    mp.stop();
                    mp.release();
                }
            });
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }
}

另外：AudioTrack 建议为 Java 应用程序播放单个音频资源。