android - java.lang.RuntimeException : start failed(Front camera recording)

Question

我在尝试从前置摄像头录制视频时遇到异常。但是后置摄像头录制工作正常。崩溃在线 mMediaRecorder.start();

java.lang.RuntimeException: start failed.
       at android.media.MediaRecorder.start(MediaRecorder.java)
       at xyz.CameraFragment$6.onClick(CameraFragment.java:270)
       at android.view.View.performClick(View.java:4466)
       at android.view.View$PerformClick.run(View.java:18537)
       at android.os.Handler.handleCallback(Handler.java:733)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:136)
       at android.app.ActivityThread.main(ActivityThread.java:5102)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:515)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
       at dalvik.system.NativeStart.main(NativeStart.java)

下面是我的代码-

private boolean prepareVideoRecorder() {
    mMediaRecorder = new MediaRecorder();
    mCamera.unlock();
    mMediaRecorder.setCamera(mCamera);
    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
    mVideoFile = new File(getOutputMediaFile().toString());
    mMediaRecorder.setOutputFile(mVideoFile.getAbsolutePath());
    mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
    mMediaRecorder.setOrientationHint(270);
    mMediaRecorder.setMaxDuration(10000);
    mMediaRecorder.setOnInfoListener(this);
    try {
        mMediaRecorder.prepare();
    } catch (IllegalStateException e) {
        Log.d("CAMERA", "IllegalStateException preparing MediaRecorder: " + e.getMessage());
        releaseMediaRecorder();
        return false;
    } catch (IOException e) {
        Log.d("CAMERA", "IOException preparing MediaRecorder: " + e.getMessage());
        releaseMediaRecorder();
        return false;
    }
    return true;
}
if (prepareVideoRecorder()) {
    // Camera is available and unlocked, MediaRecorder is prepared,
    // now you can start recording
    mMediaRecorder.start();
}

Answer 1

基于spitzanator的回答:

1. 确保您的权限正确:

<uses-feature android:name="android.hardware.camera.front" />

显然这行代码不适用于前置摄像头:

mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));

spitzanator 还说:CamcorderProfile.get() 的签名默认为后置摄像头的配置文件:

Returns the camcorder profile for the first back-facing camera on the device at the given quality level. If the device has no back-facing camera, this returns null.

理想的解决方案可以找到here .

旁注:由于声誉较低，我无法发表评论而不是发布答案，因此所有积分均归于 spitzanator .