android蓝牙和线同时播放,Android蓝牙音频播放和录制

Android蓝牙和线同时播放音频是可以实现的，需要使用AudioManager的多媒体音量控制和AudioTrack进行音频播放。

具体实现步骤如下：

1. 获取系统AudioManager实例。

AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

2. 将多媒体音量设置为最大值。

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC), 0);

3. 初始化AudioTrack，指定音频采样率、声道数和音频格式。

int sampleRate = 44100;
int channelConfig = AudioFormat.CHANNEL_OUT_STEREO;
int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
int bufferSize = AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat);
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, channelConfig, audioFormat, bufferSize, AudioTrack.MODE_STREAM);

4. 将音频数据写入AudioTrack。

audioTrack.write(audioData, 0, audioData.length);

5. 启动AudioTrack播放音频。

audioTrack.play();

同时，如果要实现Android蓝牙音频播放和录制，需要使用BluetoothA2dp和BluetoothHeadsetProfile代表蓝牙A2DP和耳机协议，并使用MediaRecorder进行录制。

具体实现步骤如下：

1. 获取系统BluetoothAdapter实例。

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

2. 获取蓝牙A2DP和耳机协议的代表实例。

BluetoothProfile a2dpProfile = bluetoothAdapter.getProfileProxy(context, new BluetoothProfile.ServiceListener() {
    @Override
    public void onServiceConnected(int profile, BluetoothProfile proxy) {
        if (profile == BluetoothProfile.A2DP) {
            a2dpProfile = (BluetoothA2dp) proxy;
        }
    }

    @Override
    public void onServiceDisconnected(int profile) {
        if (profile == BluetoothProfile.A2DP) {
            a2dpProfile = null;
        }
    }
}, BluetoothProfile.A2DP);

BluetoothProfile headsetProfile = bluetoothAdapter.getProfileProxy(context, new BluetoothProfile.ServiceListener() {
    @Override
    public void onServiceConnected(int profile, BluetoothProfile proxy) {
        if (profile == BluetoothProfile.HEADSET) {
            headsetProfile = (BluetoothHeadset) proxy;
        }
    }

    @Override
    public void onServiceDisconnected(int profile) {
        if (profile == BluetoothProfile.HEADSET) {
            headsetProfile = null;
        }
    }
}, BluetoothProfile.HEADSET);

3. 连接蓝牙设备。

BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
a2dpProfile.connect(device);
headsetProfile.connect(device);

4. 使用MediaRecorder进行录制。

MediaRecorder mediaRecorder = new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.setOutputFile(outputFile);
mediaRecorder.prepare();
mediaRecorder.start();

5. 使用AudioTrack进行播放。

int sampleRate = 44100;
int channelConfig = AudioFormat.CHANNEL_OUT_STEREO;
int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
int bufferSize = AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat);
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, channelConfig, audioFormat, bufferSize, AudioTrack.MODE_STREAM);
audioTrack.play();