NullPointerException - 如果尝试取消后重新录制视频

问题描述

我已经集成摄像头，允许用户记录时间的推移videos.When用户在录制视频的取消按钮在那里，它允许用户取消当前recording.My问题是，如果取消后，我尝试重新录制我出现以下情况例外 -

 显示java.lang.NullPointerException：尝试从外地'诠释android.media.CamcorderProfile.fileFormat读一空对象引用
       在android.media.MediaRecorder.setProfile（MediaRecorder.java:423）
       在xyz.fragments.CameraFragment。prepareFastVideoRecorder（CameraFragment.java:448）
       在xyz.fragments.CameraFragment.access $ 2300（CameraFragment.java:64）
       在xyz.fragments.CameraFragment $ 6.onClick（CameraFragment.java:329）
       在android.view.View.performClick（View.java:4756）
       在android.view.View $ PerformClick.run（View.java:19761）
       在android.os.Handler.handleCallback（Handler.java:739）
       在android.os.Handler.dispatchMessage（Handler.java:95）
       在android.os.Looper.loop（Looper.java:135）
       在android.app.ActivityThread.main（ActivityThread.java:5253）
       在java.lang.reflect.Method.invoke（Method.java）
       在java.lang.reflect.Method.invoke（Method.java:372）
       在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:899）
       在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:694）
 

这行

<$p$p><$c$c>mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_TIME_LAPSE_480P));

下面是我的code -

  start.setOnClickListener（新View.OnClickListener（）{
            @覆盖
            公共无效的onClick（查看视图）{                        如果（prepareFastVideoRecorder（））{                            mMediaRecorder.start（）;                        }其他{                            releaseMediaRecorder（）;
                        }
                    }
                }
            }
        }）;stop.setOnClickListener（新View.OnClickListener（）{
            @覆盖
            公共无效的onClick（查看视图）{
                    mMediaRecorder.stop（）; //停止录制
                    releaseMediaRecorder（）; //释放MediaRecorder对象
                    mCamera.lock（）; //拿相机背部的访问，从
}
}）：
私人布尔prepareFastVideoRecorder（）{
    mMediaRecorder =新MediaRecorder（）;
    尝试{
        mCamera.set previewDisplay（NULL）;
    }赶上（java.io.IOException异常IOE）{
        Log.e（Bhuvnesh，IOException异常作废preVIEW显示：+ ioe.getMessage（））;
    }
    mCamera.stop preVIEW（）;
    //第1步：解锁并设置相机MediaRecorder
    mCamera.unlock（）;
    mMediaRecorder.setCamera（mCamera）;
    //第2步：设置源
    mMediaRecorder.setVideoSource（MediaRecorder.VideoSource.DEFAULT）;
    mMediaRecorder.setProfile（CamcorderProfile.get（CamcorderProfile.QUALITY_TIME_LAPSE_480P））;
    //mMediaRecorder.setCaptureRate(0.1）; //捕获帧每10秒
    mMediaRecorder.setCaptureRate（5）; //捕获帧每1秒
    //第4步：设置输出文件的socket
    mVideoFile =新的文件（getOutputMediaFile（）的toString（））;
    mMediaRecorder.setOutputFile（mVideoFile.getAbsolutePath（））;
    如果（cameratype == 1）
        mMediaRecorder.setOrientationHint（90）;
    否则如果（cameratype == 2）
        mMediaRecorder.setOrientationHint（270）;
    mMediaRecorder.setMaxDuration（60000）;
    mMediaRecorder.setOnInfoListener（本）;
    //第5步：设置preVIEW输出
    mMediaRecorder.set previewDisplay（M preview.getHolder（）getSurface（））;
    尝试{
        mMediaRecorder prepare（）。
    }赶上（IllegalStateException异常五）{
        releaseMediaRecorder（）;
        返回false;
    }赶上（IOException异常五）{
        releaseMediaRecorder（）;
        返回false;
    }
    返回true;
}
 

解决方案

您需要通过当前摄像机的ID，而使用的 凸轮coderProfile 。它将返回默认摄像头的轮廓，如果这种说法是不通过。

尝试，

<$p$p><$c$c>mMediaRecorder.setProfile(CamcorderProfile.get(camId,CamcorderProfile.QUALITY_TIME_LAPSE_480P));

I have integrated camera which allows user to record time lapse videos.When the user is recording a video a cancel button is there which allows user to cancel the current recording.My issue is that if after cancelling i try to record again i get the following exception-

java.lang.NullPointerException: Attempt to read from field 'int android.media.CamcorderProfile.fileFormat' on a null object reference
       at android.media.MediaRecorder.setProfile(MediaRecorder.java:423)
       at xyz.fragments.CameraFragment.prepareFastVideoRecorder(CameraFragment.java:448)
       at xyz.fragments.CameraFragment.access$2300(CameraFragment.java:64)
       at xyz.fragments.CameraFragment$6.onClick(CameraFragment.java:329)
       at android.view.View.performClick(View.java:4756)
       at android.view.View$PerformClick.run(View.java:19761)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5253)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

on line

mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_TIME_LAPSE_480P));

Below is my code-

start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {



                        if (prepareFastVideoRecorder()) {

                            mMediaRecorder.start();

                        } else {

                            releaseMediaRecorder();
                        }
                    }
                }
            }
        });

stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {


                    mMediaRecorder.stop();  // stop the recording
                    releaseMediaRecorder(); // release the MediaRecorder object
                    mCamera.lock();         // take camera access back from
}
}):


private boolean prepareFastVideoRecorder() {
    mMediaRecorder = new MediaRecorder();
    try {
        mCamera.setPreviewDisplay(null);
    } catch (java.io.IOException ioe) {
        Log.e("Bhuvnesh", "IOException nullifying preview display: " + ioe.getMessage());
    }
    mCamera.stopPreview();
    // Step 1: Unlock and set camera to MediaRecorder
    mCamera.unlock();
    mMediaRecorder.setCamera(mCamera);
    // Step 2: Set sources
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
    mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_TIME_LAPSE_480P));
    //mMediaRecorder.setCaptureRate(0.1); // capture a frame every 10 seconds
    mMediaRecorder.setCaptureRate(5); // capture a frame every 1 seconds
    // Step 4: Set output file to the socket
    mVideoFile = new File(getOutputMediaFile().toString());
    mMediaRecorder.setOutputFile(mVideoFile.getAbsolutePath());
    if (cameratype == 1)
        mMediaRecorder.setOrientationHint(90);
    else if (cameratype == 2)
        mMediaRecorder.setOrientationHint(270);
    mMediaRecorder.setMaxDuration(60000);
    mMediaRecorder.setOnInfoListener(this);
    // Step 5: Set the preview output
    mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
    try {
        mMediaRecorder.prepare();
    } catch (IllegalStateException e) {
        releaseMediaRecorder();
        return false;
    } catch (IOException e) {
        releaseMediaRecorder();
        return false;
    }
    return true;
}

解决方案

You need to pass the current camera id while using get() in CamcoderProfile. It will return the profile of default camera if this argument is not passed.

Try,

mMediaRecorder.setProfile(CamcorderProfile.get(camId,CamcorderProfile.QUALITY_TIME_LAPSE_480P));

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