请扮演一位高级Android开发工程师，通过rtmp，将主播摄像头内容，以rtmp协议，实时推流到srs服务器，请提供代码

好的，以下是一个简单的 Android 推流代码示例，使用 RTMP 协议将摄像头内容实时推流到 SRS 服务器：

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback, Camera.PreviewCallback {

    private Camera mCamera;
    private SurfaceView mSurfaceView;
    private SurfaceHolder mSurfaceHolder;
    private boolean mIsPreviewing = false;
    private boolean mIsStreaming = false;
    private RtmpPublisher mRtmpPublisher;

    private static final String SRS_SERVER_URL = "rtmp://your-srs-server-url/live/stream-key";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mSurfaceView = findViewById(R.id.surface_view);
        mSurfaceHolder = mSurfaceView.getHolder();
        mSurfaceHolder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        mCamera = Camera.open();
        try {
            mCamera.setPreviewDisplay(mSurfaceHolder);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        Camera.Parameters parameters = mCamera.getParameters();
        parameters.setPreviewSize(width, height);
        mCamera.setParameters(parameters);
        mCamera.setPreviewCallback(this);
        mCamera.startPreview();
        mIsPreviewing = true;
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mCamera.stopPreview();
        mCamera.release();
        mIsPreviewing = false;
    }

    @Override
    public void onPreviewFrame(byte[] data, Camera camera) {
        if (mIsStreaming) {
            mRtmpPublisher.publishVideoFrame(data);
        }
    }

    public void startStreaming(View view) {
        if (!mIsStreaming) {
            mRtmpPublisher = new RtmpPublisher(SRS_SERVER_URL);
            mRtmpPublisher.connect();
            mRtmpPublisher.publishVideo();
            mIsStreaming = true;
        }
    }

    public void stopStreaming(View view) {
        if (mIsStreaming) {
            mRtmpPublisher.stop();
            mIsStreaming = false;
        }
    }
}

这段代码使用了 Android 自带的摄像头 API，通过 `SurfaceView` 显示摄像头预览画面，并实现了 `SurfaceHolder.Callback` 和 `Camera.PreviewCallback` 接口来管理摄像头和预览画面。同时，使用了第三方的 RTMP 推流库 `RtmpPublisher`，该库可以通过 `publishVideoFrame` 方法将摄像头采集到的视频数据实时推流到指定的 SRS 服务器。

注意：以上代码仅供参考，实际使用时需要根据具体情况进行修改和优化。