在无效状态下调用MediaRecorder启动:4 [英] MediaRecorder start called in invalid state: 4
问题描述
我刚刚开始进入android/Glass开发,我试图添加基本的视频录制功能.目前,Glass将您的时间限制为10秒,除非您再次点击/按下按钮,而我想绕过此操作,而只是拥有一个开放式视频录像机.
I've just started getting into android/Glass development and I was trying to add basic video recording functionality. Currently Glass limits you to 10 seconds unless you tap/press button again and I wanted to bypass this and just have an open ended video recorder.
我都遵循了相机 API 的步骤-通过:
I followed both the Camera API walk-through:
并引用了另一个项目:
到目前为止,我的代码如下:
So far my code looks like this:
private void startRecording()
{
try{
camera = Camera.open();
mediaRecorder = new MediaRecorder();
surfaceView = new CamSurfaceView(this, camera);
try {
camera.setPreviewDisplay(surfaceView.getHolder());
} catch (IOException e1) {
}
camera.startPreview();
camera.unlock();
mediaRecorder.setCamera(camera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setProfile(CamcorderProfile.get(MediaRecorder.OutputFormat.MPEG_4));
mediaRecorder.setOutputFile(getOutputMediaFile().toString());
mediaRecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());
try{
mediaRecorder.prepare();
}
catch(IllegalStateException e){
}
catch(IOException e){
}
mediaRecorder.start(); //Code failure occurs here.
}
catch(Exception e)
{
if(mediaRecorder != null)
mediaRecorder.release();
if(camera != null)
camera.release();
}
}
private Uri getOutputMediaFile()
{
File mediaStorageDir = new File(Environment.getExternalStorageDirectory()+File.separator+"DCIM/Camera");
File[] files =mediaStorageDir.listFiles();
if(!mediaStorageDir.exists())
{
if(!mediaStorageDir.mkdirs())
{
Log.d("KarmaCam","Failed to create directory");
return null;
}
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File file = new File(mediaStorageDir.getPath() + File.separator+ "VID_"+timeStamp+".mp4");
return Uri.fromFile(file);
}
我的SurfaceView:
My SurfaceView:
public class KarmaCamSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
public CamSurfaceView(Context context, Camera camera) {
super(context);
mCamera = camera;
mHolder = getHolder();
mHolder.addCallback(this);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int weight, int height) {
if(mHolder.getSurface() == null)
return;
try
{
mCamera.stopPreview();
}
catch(Exception e) {}
try
{
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
}
catch(Exception e){}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try
{
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
}
catch(Exception e){}
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
}
我见过其他人也有类似的问题/问题,它们通常是围绕不正确的输出文件名格式发生的.据我所知,我很好,但是我很好奇目录路径是否有效.这是内置Glass视频的存储位置.
I've seen others with similar problems/questions and they are usually happening around improper output file name formats. As far as I can tell mine would be fine, but I'm curious if the directory path is valid. This is where the built in Glass videos get stored.
推荐答案
尝试将< uses-permission android:name ="android.permission.WRITE_EXTERNAL_STORAGE"/>
添加到您的AndroidManifest.xml中
Try add <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
to your AndroidManifest.xml
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