package com.example.book_mediarecorder;import java.io.File;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.SparseIntArray;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.graphics.PixelFormat;
import android.hardware.Camera; public class MediaRecord extends Activity implements SurfaceHolder.Callback{private SurfaceView mSurfaceView;private SurfaceHolder mSurfaceHolder;private Button btnStartStop;private boolean isRecording = false;//标记是否已经在录制private  MediaRecorder mRecorder;//音视频录制类private Camera mCamera = null;//相机private Camera.Size mSize = null;//相机的尺寸private int mCameraFacing = Camera.CameraInfo.CAMERA_FACING_BACK;//默认后置摄像头private static final SparseIntArray orientations = new SparseIntArray();//手机旋转对应的调整角度static {orientations.append(Surface.ROTATION_0, 90);orientations.append(Surface.ROTATION_90, 0);orientations.append(Surface.ROTATION_180, 270);orientations.append(Surface.ROTATION_270, 180);}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setWindow();setContentView(R.layout.mediarecord);initViews();}private void setWindow() {requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉标题栏getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);// 设置全屏// 设置竖屏显示setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);// 选择支持半透明模式,在有surfaceview的activity中使用。getWindow().setFormat(PixelFormat.TRANSLUCENT);}private void initViews() {mSurfaceView = (SurfaceView) findViewById(R.id.sf_view);btnStartStop = (Button) findViewById(R.id.rButton_media);btnStartStop.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (!isRecording) {startRecord();} else {stopRecord();}}});SurfaceHolder holder = mSurfaceView.getHolder();// 取得holderholder.setFormat(PixelFormat.TRANSPARENT);holder.setKeepScreenOn(true);holder.addCallback(this); // holder加入回调接口}/*** 初始化相机*/private void initCamera() {if (Camera.getNumberOfCameras() == 2) {mCamera = Camera.open(mCameraFacing);} else {mCamera = Camera.open();}CameraSizeComparator sizeComparator = new CameraSizeComparator();Camera.Parameters parameters = mCamera.getParameters();if (mSize == null) {List<Camera.Size> vSizeList = parameters.getSupportedPreviewSizes();Collections.sort(vSizeList, sizeComparator);for (int num = 0; num < vSizeList.size(); num++) {Camera.Size size = vSizeList.get(num);if (size.width >= 800 && size.height >= 480) {this.mSize = size;break;}}mSize = vSizeList.get(0);List<String> focusModesList = parameters.getSupportedFocusModes();//增加对聚焦模式的判断if (focusModesList.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO)) {parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);} else if (focusModesList.contains(Camera.Parameters.FOCUS_MODE_AUTO)) {parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);}mCamera.setParameters(parameters);}int rotation = getWindowManager().getDefaultDisplay().getRotation();int orientation = orientations.get(rotation);mCamera.setDisplayOrientation(orientation);}@Overrideprotected void onResume() {super.onResume();initCamera();}@Overridepublic void onPause() {releaseCamera();super.onPause();}/*** 开始录制*/private void startRecord() {if (mRecorder == null) {mRecorder = new MediaRecorder(); // 创建MediaRecorder}if (mCamera != null) {mCamera.stopPreview();mCamera.unlock();mRecorder.setCamera(mCamera);}try {// 设置音频采集方式mRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);//设置视频的采集方式mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);//设置文件的输出格式mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);//aac_adif， aac_adts， output_format_rtp_avp， output_format_mpeg2ts ，webm//设置audio的编码格式mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//设置video的编码格式mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);//设置录制的视频编码比特率mRecorder.setVideoEncodingBitRate(1024 * 1024);//设置录制的视频帧率,注意文档的说明:mRecorder.setVideoFrameRate(30);//设置要捕获的视频的宽度和高度mSurfaceHolder.setFixedSize(320, 240);//最高只能设置640x480mRecorder.setVideoSize(320, 240);//最高只能设置640x480//设置记录会话的最大持续时间（毫秒）mRecorder.setMaxDuration(60 * 1000);mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());String path = getExternalCacheDir().getPath();if (path != null) {File dir = new File(path + "/videos");if (!dir.exists()) {dir.mkdir();}path = dir + "/" + System.currentTimeMillis() + ".mp4";//设置输出文件的路径mRecorder.setOutputFile(path);//准备录制mRecorder.prepare();//开始录制mRecorder.start();isRecording = true;btnStartStop.setText("停止");}} catch (Exception e) {e.printStackTrace();}}/*** 停止录制*/private void stopRecord() {try {//停止录制mRecorder.stop();//重置mRecorder.reset();btnStartStop.setText("开始");} catch (Exception e) {e.printStackTrace();}isRecording = false;}/*** 释放MediaRecorder*/private void releaseMediaRecorder() {if (mRecorder != null) {mRecorder.release();mRecorder = null;}}/*** 释放相机资源*/private void releaseCamera() {try {if (mCamera != null) {mCamera.stopPreview();mCamera.setPreviewCallback(null);mCamera.unlock();mCamera.release();}} catch (RuntimeException e) {} finally {mCamera = null;}}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// 将holder，这个holder为开始在onCreate里面取得的holder，将它赋给mSurfaceHoldermSurfaceHolder = holder;if (mCamera == null) {return;}try {//设置显示mCamera.setPreviewDisplay(holder);mCamera.startPreview();} catch (Exception e) {e.printStackTrace();releaseCamera();finish();}}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// 将holder，这个holder为开始在onCreate里面取得的holder，将它赋给mSurfaceHoldermSurfaceHolder = holder;}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// surfaceDestroyed的时候同时对象设置为nullif (isRecording && mCamera != null) {mCamera.lock();}mSurfaceView = null;mSurfaceHolder = null;releaseMediaRecorder();releaseCamera();}private class CameraSizeComparator implements Comparator<Camera.Size> {public int compare(Camera.Size lhs, Camera.Size rhs) {if (lhs.width == rhs.width) {return 0;} else if (lhs.width > rhs.width) {return 1;} else {return -1;}}}}

• XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><SurfaceViewandroid:id="@+id/sf_view"android:layout_width="match_parent"android:layout_height="match_parent" /><Buttonandroid:id="@+id/rButton_media"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:layout_centerHorizontal="true"android:text="开始录像" /></RelativeLayout>

• 权限

  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.RECORD_AUDIO" /><uses-permission android:name="android.permission.CAMERA" /><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><!-- 硬件支持 --><uses-feature android:name="android.hardware.camera" /><uses-feature android:name="android.hardware.camera.autofocus" />

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