Android：同时录制视频和播放 mp3？
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【中文标题】Android：同时录制视频和播放 mp3？【英文标题】：Android: Record video and play mp3 simultaneously? 【发布时间】：2013-01-19 02:36:02 【问题描述】：有没有办法在 android 4.x 上录制视频（无声）时播放 mp3（或其他）音频文件？ 有没有人尝试过实现这一目标？
【问题讨论】：
您可以在录制时使用该服务在后台播放音乐。 【参考方案1】：我曾尝试在录制声音时播放声音并且它正在工作，所以我很确定在录制视频时也可以。您只需要有单独的线程来进行视频录制和声音播放。
【讨论】：
您是使用两个应用程序还是使用 SDK 来实现的？ @kristopher 但它可能会有大约毫秒的延迟。如何减少延迟？【参考方案2】：package com.technologies.mash.MySounds.Music;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.media.AudioManager;
import android.media.CamcorderProfile;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.Toast;
import com.technologies.mash.CameraPreview;
import com.technologies.mash.PlayVideo;
import com.technologies.mash.R;
import com.technologies.mash.Sound;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class AlbumDetailVideo extends Activity
private Camera mCamera;
private CameraPreview mPreview;
private MediaRecorder mediaRecorder;
private Button capture, switchCamera;
private Context myContext;
private RelativeLayout cameraPreview;
AudioManager audioManager;
private boolean cameraFront = false;
// private ArrayList<Sound> mSounds = null;
int z = 0;
Sound s1;
MediaPlayer mPlayer;
int sound;
String urls;
String audio, root, video, video_new, output;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_album_detail_video);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
// getting songpath from server
Intent i = getIntent();
urls = i.getStringExtra("songpath");
// String urls = getIntent().getExtras().getString("songpath");
Toast.makeText(AlbumDetailVideo.this, "Sound id" + urls, Toast.LENGTH_SHORT).show();
Log.e("url", urls);
// mSounds = new ArrayList<Sound>();
myContext = this;
initialize();
private int findFrontFacingCamera()
int cameraId = -1;
// Search for the front facing camera
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++)
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT)
cameraId = i;
cameraFront = true;
break;
return cameraId;
private String readTxt()
InputStream inputStream = getResources().openRawResource(z);//getting the .txt file
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
int i;
try
i = inputStream.read();
while (i != -1)
byteArrayOutputStream.write(i);
i = inputStream.read();
inputStream.close();
catch (IOException e)
e.printStackTrace();
return byteArrayOutputStream.toString();
private int findBackFacingCamera()
int cameraId = -1;
// Search for the back facing camera
// get the number of cameras
int numberOfCameras = Camera.getNumberOfCameras();
// for every camera check
for (int i = 0; i < numberOfCameras; i++)
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK)
cameraId = i;
cameraFront = false;
break;
return cameraId;
public void onResume()
super.onResume();
if (!hasCamera(myContext))
Toast toast = Toast.makeText(myContext, "Sorry, your phone does not have a camera!", Toast.LENGTH_LONG);
toast.show();
finish();
if (mCamera == null)
// if the front facing camera does not exist
if (findFrontFacingCamera() < 0)
Toast.makeText(this, "No front facing camera found.", Toast.LENGTH_LONG).show();
switchCamera.setVisibility(View.GONE);
mCamera = Camera.open(findBackFacingCamera());
mCamera.setDisplayOrientation(90);
mPreview.refreshCamera(mCamera);
public void initialize()
cameraPreview = (RelativeLayout) findViewById(R.id.camera_preview);
mPreview = new CameraPreview(myContext, mCamera);
cameraPreview.addView(mPreview);
capture = (Button) findViewById(R.id.button_capture);
capture.setOnClickListener(captrureListener);
switchCamera = (Button) findViewById(R.id.button_ChangeCamera);
switchCamera.setOnClickListener(switchCameraListener);
View.OnClickListener switchCameraListener = new View.OnClickListener()
@Override
public void onClick(View v)
// get the number of cameras
if (!recording)
int camerasNumber = Camera.getNumberOfCameras();
if (camerasNumber > 1)
// release the old camera instance
// switch camera, from the front and the back and vice versa
releaseCamera();
chooseCamera();
else
Toast toast = Toast.makeText(myContext, "Sorry, your phone has only one camera!", Toast.LENGTH_LONG);
toast.show();
;
public void chooseCamera()
// if the camera preview is the front
if (cameraFront)
int cameraId = findBackFacingCamera();
if (cameraId >= 0)
// open the backFacingCamera
// set a picture callback
// refresh the preview
mCamera = Camera.open(cameraId);
mCamera.setDisplayOrientation(90);
// mPicture = getPictureCallback();
mPreview.refreshCamera(mCamera);
else
int cameraId = findFrontFacingCamera();
if (cameraId >= 0)
// open the backFacingCamera
// set a picture callback
// refresh the preview
mCamera = Camera.open(cameraId);
mCamera.setDisplayOrientation(90);
// mPicture = getPictureCallback();
mPreview.refreshCamera(mCamera);
@Override
protected void onPause()
super.onPause();
// when on Pause, release camera in order to be used from other
// applications
releaseCamera();
private boolean hasCamera(Context context)
// check if the device has camera
if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA))
return true;
else
return false;
boolean recording = false;
View.OnClickListener captrureListener = new View.OnClickListener()
@Override
public void onClick(View v)
Toast.makeText(AlbumDetailVideo.this, "Playing.." + urls, Toast.LENGTH_SHORT).show();
if (recording)
// stop recording and release camera
mediaRecorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
mPlayer.stop();
Intent intent = new Intent(getApplicationContext(), PlayVideo.class);
startActivity(intent);
finish();
Toast.makeText(AlbumDetailVideo.this, "Video captured!", Toast.LENGTH_LONG).show();
recording = false;
else
if (!prepareMediaRecorder())
Toast.makeText(AlbumDetailVideo.this, "Fail in prepareMediaRecorder()!\n - Ended -", Toast.LENGTH_LONG).show();
finish();
// work on UiThread for better performance
runOnUiThread(new Runnable()
public void run()
mPlayer = new MediaPlayer();
mPlayer.setAudiostreamType(AudioManager.STREAM_MUSIC);
try
mPlayer.setDataSource(urls);
catch (IllegalArgumentException e)
Toast.makeText(AlbumDetailVideo.this, "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
catch (SecurityException e)
Toast.makeText(AlbumDetailVideo.this, "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
catch (IllegalStateException e)
Toast.makeText(AlbumDetailVideo.this, "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
catch (IOException e)
e.printStackTrace();
try
mPlayer.prepare();
catch (IllegalStateException e)
Toast.makeText(AlbumDetailVideo.this, "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
catch (IOException e)
Toast.makeText(AlbumDetailVideo.this, "You might not set the URI correctly!", Toast.LENGTH_LONG).show();
mediaRecorder.start();
mPlayer.start();
);
recording = true;
;
private void releaseMediaRecorder()
if (mediaRecorder != null)
mediaRecorder.reset(); // clear recorder configuration
mediaRecorder.release(); // release the recorder object
mediaRecorder = null;
mCamera.lock(); // lock camera for later use
private boolean prepareMediaRecorder()
mediaRecorder = new MediaRecorder();
// CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_LOW);
mCamera.unlock();
mediaRecorder.setCamera(mCamera);
// mediaRecorder.setAudioSource(MediaRecorder.AudioEncoder.AAC_ELD);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_RECOGNITION);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
/* mediaRecorder.setOutputFormat(profile.fileFormat);
mediaRecorder.setVideoEncoder(profile.videoCodec);
mediaRecorder.setVideoEncodingBitRate(profile.videoBitRate);
mediaRecorder.setVideoFrameRate(profile.videoFrameRate);
mediaRecorder.setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight);*/
mediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
try
mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW));
catch (Exception e)
mediaRecorder.setOutputFile("/sdcard/rohit.mp4");
mediaRecorder.setMaxDuration(600000); // Set max duration 60 sec.
mediaRecorder.setMaxFileSize(50000000); // Set max file size 50M
try
mediaRecorder.prepare();
catch (IllegalStateException e)
releaseMediaRecorder();
return false;
catch (IOException e)
releaseMediaRecorder();
return false;
return true;
/* private boolean prepareMediaRecorder()
mediaRecorder = new MediaRecorder();
mCamera.unlock();
mediaRecorder.setCamera(mCamera);
//mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
try
mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
catch (Exception e)
mediaRecorder.setOutputFile("/sdcard/myvideo.mp4");
mediaRecorder.setMaxDuration(600000); // Set max duration 60 sec.
mediaRecorder.setMaxFileSize(50000000); // Set max file size 50M
try
mediaRecorder.prepare();
catch (IllegalStateException e)
releaseMediaRecorder();
return false;
catch (IOException e)
releaseMediaRecorder();
return false;
return true;
*/
private void releaseCamera()
// stop and release camera
if (mCamera != null)
mCamera.release();
mCamera = null;
【讨论】：
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