我们一般直接从摄像头和麦克风取数据，经过编码，保存为文件。android的视频录制需要使用到MediaRecorder，MediaRecorder除了可以用于录制音频，还可用于录制视频。
效果图如下图所示：
一个为录制过程中，可以看到屏幕上方的录制时间显示，后一个为停止录制视频。
然后录制好的视频可以在手机的SD卡中找到，如下图所示：
视频录制步骤:
1) 调用MediaRecorder 对象的setVideoEncoder()、setVideoEncodingBitRate(intbitRate)、setVideoFrameRate设置所录制的视频的编码格式、编码位率、每秒多少帧等，这些参数将可以控制所录制的视频的品质、文件的大小。一般来说，视频品质越好，视频文件越大。
2) 调用 MediaRecorder的setPreviewDisplay(Surfacesv)方法设置使用哪个SurfaceView来显示视频预览。
实例使用MediaRecorder录制视频：
import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.*;
import android.view.SurfaceHolder.Callback;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Calendar;
@SuppressLint("SimpleDateFormat")
public class MyActivity extends Activity implements Callback {
private SurfaceView mSurfaceview;
private Button mBtnStartStop;// 开始停止录制按键
private boolean mStartedFlg = false;
private MediaRecorder mRecorder;// 录制视频的类
private SurfaceHolder mSurfaceHolder;// 显示视频
private Camera camera;
private TextView timeView;// 在屏幕顶部显示录制时间
private int time = 0;
@SuppressLint("HandlerLeak")
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case 1:// 开始录制
timeView.setText(time + " s");
break;
case 2:// 录制8s结束
mRecorder.stop();
mRecorder.reset(); // You can reuse the object by
mBtnStartStop.setText("Start");
mStartedFlg = false;
time = 0;
timeView.setText(time + " s");
break;
case 3:// 体检结束
time = 0;
timeView.setText(time + " s");
break;
}
}
;
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉标题栏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);// 设置全屏
getWindow().setFormat(PixelFormat.TRANSLUCENT); // 选择支持半透明模式,在有surfaceview的activity中使用。
setContentView(R.layout.main);// 加载布局
timeView = (TextView) findViewById(R.id.time);
mSurfaceview = (SurfaceView) findViewById(R.id.surfaceview);
mBtnStartStop = (Button) findViewById(R.id.btn);
mBtnStartStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (!mStartedFlg) {
// 开始
if (mRecorder == null) {
mRecorder = new MediaRecorder(); // 创建mediarecorder的对象
}
try {
camera.unlock();
mRecorder.setCamera(camera);
mRecorder
.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);// 这两项需要放在setOutputFormat之前
mRecorder
.setVideoSource(MediaRecorder.VideoSource.CAMERA);// 设置录制视频源为Camera(相机)
mRecorder.setOrientationHint(90);
// Set output file format
mRecorder
.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);// 设置录制完成后视频的封装格式THREE_GPP为3gp.MPEG_4为mp4
// 这两项需要放在setOutputFormat之后
mRecorder
.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mRecorder
.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);// 设置录制的视频编码h263
mRecorder.setVideoSize(800, 480);// 设置视频录制的分辨率。必须放在设置编码和格式的后面，否则报错
mRecorder.setVideoFrameRate(30);// 设置录制的视频帧率。必须放在设置编码和格式的后面，否则报错
mRecorder.setMaxDuration(8000);// 设置最大的录制时间
mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
// Set output file path
String path = getSDPath();
if (path != null) {
File dir = new File(path + "/recordtest");
if (!dir.exists()) {
dir.mkdir();
}
path = dir + "/" + getDate() + ".mp4";
Toast.makeText(MyActivity.this, path,
Toast.LENGTH_LONG).show();
mRecorder.setOutputFile(path);
mRecorder.prepare();// 准备录制
mRecorder.start(); // 开始录制
new Thread(new Runnable() {
@Override
public void run() {
while (time < 8) {
try {
time++;
Thread.sleep(1000);
handler.sendEmptyMessage(1);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
handler.sendEmptyMessage(2);
}
}).start();
mStartedFlg = true;
mBtnStartStop.setText("Stop");
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
// stop
if (mStartedFlg) {
try {
mRecorder.stop();
mRecorder.reset(); // You can reuse the object by
// going back to
// setAudioSource() step
mBtnStartStop.setText("Start");
handler.sendEmptyMessageDelayed(3, 1000);
} catch (Exception e) {
e.printStackTrace();
}
}
mStartedFlg = false; // Set button status flag
}
}
});
SurfaceHolder holder = mSurfaceview.getHolder();// 取得holder
holder.addCallback(this); // holder加入回调接口
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// setType必须设置，要不出错.
}
/**
* 使用时间对录像起名
*
* @return
*/
public static String getDate() {
Calendar ca = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmmss");
String date = sdf.format(ca.getTimeInMillis());
return date;
}
/**
* 获取SD path
*
* @return
*/
public String getSDPath() {
File sdDir = null;
boolean sdCardExist = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED); // 判断sd卡是否存在
if (sdCardExist) {
sdDir = Environment.getExternalStorageDirectory();// 获取跟目录
// Toast.makeText(this,sdDir.toString(),Toast.LENGTH_LONG).show();
return sdDir.toString();
} else {
Toast.makeText(this, "没有SD卡", Toast.LENGTH_LONG).show();
}
return null;
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
camera = Camera.open(); // 获取Camera实例
try {
camera.setPreviewDisplay(holder);
mSurfaceview.setLayoutParams(new LinearLayout.LayoutParams(width,
height));
} catch (Exception e) {
// 如果出现异常，则释放Camera对象
camera.release();
}
camera.setDisplayOrientation(90);// 设置预览视频时时竖屏
// 启动预览功能
camera.startPreview();
// 将holder，这个holder为开始在onCreate里面取得的holder，将它赋给mSurfaceHolder
mSurfaceHolder = holder;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// 将holder，这个holder为开始在onCreate里面取得的holder，将它赋给mSurfaceHolder
mSurfaceHolder = holder;
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
// surfaceDestroyed的时候同时对象设置为null
mSurfaceview = null;
mSurfaceHolder = null;
if (mRecorder != null) {
mRecorder.release(); // Now the object cannot be reused
mRecorder = null;
}
if (camera != null) {
camera.release();
camera = null;
}
}
}XML的布局文件为：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@android:color/white">
<TextView
android:id="@+id/time"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:text="0 s"
android:textColor="@android:color/background_dark"/>
<SurfaceView
android:id="@+id/surfaceview"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1" />
<Button
android:id="@+id/btn"
android:layout_width="101dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="0.02"
android:text="Start"
tools:context=".MainActivity" />
</LinearLayout>原文地址：http://blog.csdn.net/a296777513/article/details/43488415
