在Android的媒体记录器preVIEW显示 [英] preview display in android media recorder

问题描述

在机器人如何显示之前媒体录像机开始preVIEW表面。
我的应用程序具有视频录制功能，当我浏览到录像片段显示它黑屏，当我开始使用启动按钮，相机preVIEW是显示和记录开始录像。

如何在录制前启动preVIEW。
我增加了code，我在片段onCreateView（）使用 -

  surfaceHolder = mySurfaceView.getHolder（）;
相机= Camera.open（）;
如果（相机！= NULL）{
    camera.setDisplayOrientation（90）;
    Camera.Parameters参数;
    参数= camera.getParameters（）;
    param.set previewFrameRate（20）;
    param.set previewSize（176，144）;
    camera.setParameters（参数）;
    camera.set previewDisplay（surfaceHolder）;
}mediaRecorder =新MediaRecorder（）;
camera.unlock（）;
mediaRecorder.setCamera（摄像头）;
mediaRecorder.setAudioSource（MediaRecorder.AudioSource.DEFAULT）;
mediaRecorder.setVideoSource（MediaRecorder.VideoSource.DEFAULT）;
CamcorderProfile camcorderProfile_HQ = CamcorderProfile
            获得（CamcorderProfile.QUALITY_HIGH）;
mediaRecorder.setProfile（camcorderProfile_HQ）;
串文件路径= getOutputMediaFile（MEDIA_TYPE_VIDEO）.getPath（）;
了fileURI = getOutputMediaFileUri（MEDIA_TYPE_VIDEO）;
mediaRecorder.setOutputFile（文件路径）;
 

和code，我开始按钮点击使用 -

  mediaRecorder.set previewDisplay（surfaceHolder.getSurface（））;
mediaRecorder prepare（）。
mediaRecorder.start（）;
 

让我能够通过使用上述code重新code视频，但不能录制开始之前显示preVIEW。
请帮我我在哪里missing.for黑色屏幕被重新编码视频前显示。

先谢谢了。

解决方案

 公共无效surfaceCreated（SurfaceHolder持有人）{
        如果（mCamera！= NULL）{
            参数PARAMS = mCamera.getParameters（）;
            mCamera.setParameters（PARAMS）;
            尝试{
                //mCamera.setDisplayOrientation(90）;
                mCamera.set previewDisplay（支架）;
            }赶上（IOException异常五）{
                e.printStackTrace（）;
            }
            mCamera.start preVIEW（）;
        }
    }
 

如果您实现SurfaceHolder.Callback，覆盖surfaceCreated方法是这样的。这为我工作。

In android how to show preview surface before media recorder start. my app have video recording functionality,when i navigate to video recording fragment it display black screen,when i start recording using start button camera preview is display and recording start.

how to start preview before recording. i have added code that i used in onCreateView() of fragment-

surfaceHolder = mySurfaceView.getHolder();
camera = Camera.open();
if(camera!=null){
    camera.setDisplayOrientation(90);
    Camera.Parameters param;
    param = camera.getParameters();
    param.setPreviewFrameRate(20);
    param.setPreviewSize(176, 144);
    camera.setParameters(param);
    camera.setPreviewDisplay(surfaceHolder);
}

mediaRecorder = new MediaRecorder();
camera.unlock();
mediaRecorder.setCamera(camera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
CamcorderProfile camcorderProfile_HQ = CamcorderProfile
            .get(CamcorderProfile.QUALITY_HIGH);
mediaRecorder.setProfile(camcorderProfile_HQ);
String filePath = getOutputMediaFile(MEDIA_TYPE_VIDEO).getPath();
fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO);
mediaRecorder.setOutputFile(filePath);

and the code that i used on start button click-

mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
mediaRecorder.prepare();
mediaRecorder.start();

so i am able to recode video by using above code,but not able to show preview before recording start. Please help me where i am missing.for that black screen is displayed before recoding video.

Thanks in advance.

解决方案

public void surfaceCreated(SurfaceHolder holder) {
        if (mCamera != null) {
            Parameters params = mCamera.getParameters();
            mCamera.setParameters(params);
            try {
                //mCamera.setDisplayOrientation(90);
                mCamera.setPreviewDisplay(holder);
            } catch (IOException e) {
                e.printStackTrace();
            }
            mCamera.startPreview();
        }
    }

If you implement SurfaceHolder.Callback, override the surfaceCreated method like this. This worked for me.

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