一、前期基础知识储备

Android提供了MediaRecorder这一个类来实现视频和音频的录制。

由官方配图可知，MediaRecorder用于录制视频时需要调用一系列的API来设置和录制相关的配置，而且调用方法的顺序是固定的，必须按照这个顺序进行API调用才能正确利用手机摄像头实现录像功能。

调用MediaRecorder的录像API顺序如下：

1）Open Camera – Use the Camera.open() to get an instance of the camera object.

2）Connect Preview – Prepare a live camera image preview by connecting a SurfaceView to the camera using Camera.setPreviewDisplay().

3）Start Preview – Call Camera.startPreview() to begin displaying the live camera images.

4）Start Recording Video – The following steps must be completed in order to successfully record video:

a.Unlock the Camera – Unlock the camera for use by MediaRecorder by calling Camera.unlock().

b.Configure MediaRecorder – Call in the following MediaRecorder methods in this order:

setCamera() – Set the camera to be used for video capture，绑定Camera进行视频录制。 setAudioSource() – Set the audio source，设置音频源。 setVideoSource() – Set the video source，设置视频源。 setProfile() – Set the video output format and encoding，录制效果的配置。 setOutputFile() – Set the output file, 设置录制好的文件存储位置。 setPreviewDisplay() – Connect Preview，设置预览效果。

c.Prepare MediaRecorder- Prepare the MediaRecorder with provided configuration settings by calling MediaRecorder.prepare().

d.Start MediaRecorder – Start recording video by calling MediaRecorder.start().

停止录像时调用的API顺序如下：

1）Stop MediaRecorder – Stop recording video by calling MediaRecorder.stop(). 2）Reset MediaRecorder – Optionally, remove the configuration settings from the recorder by calling MediaRecorder.reset(). 3）Release MediaRecorder – Release the MediaRecorder by calling MediaRecorder.release(). 4）Lock the Camera – Lock the camera so that future MediaRecorder sessions can use it by calling Camera.lock(). 5）Stop the Preview – When your activity has finished using the camera, stop the preview using Camera.stopPreview(). 6）Release Camera – Release the camera so that other applications can use it by calling Camera.release().

二、上代码，具体实现录制视频和视频播放功能

这里调用MediaRecorder的API实现视频录制功能并借用MediaPlayer多媒体播放类实现录制好的视频播放。

（1）布局文件如下，非常简单两个按钮下放置一个SurfaceView；