思路：定义一个SurfaceView用来显示预览，在SurfaceHolder的回调中用Camera对象启动预览。然后调用MediaRecorder来录像。仅仅是实现了简单的录像開始和停止功能。顶部能显示显示录像的时间，还有待完好。

代码例如以下：

在AndroidManifest.xml加入以下的权限：

activity_main.xml

<SurfaceView  
    android:id="@+id/camera\_preview"  
    android:layout\_width="match\_parent"  
    android:layout\_height="match\_parent" />

<LinearLayout  
    android:layout\_width="wrap\_content"  
    android:layout\_height="wrap\_content"  
    android:layout\_alignParentTop="true"  
    android:layout\_centerHorizontal="true"  
    android:orientation="horizontal">

    <TextView  
        android:id="@+id/timestamp\_minute\_prefix"  
        android:layout\_width="wrap\_content"  
        android:layout\_height="wrap\_content"  
        android:textColor="#7F00FF"  
        android:textSize="30sp"  
        android:text="0"/>

    <TextView  
        android:id="@+id/timestamp\_minute\_text"  
        android:layout\_width="wrap\_content"  
        android:layout\_height="wrap\_content"  
        android:textColor="#7F00FF"  
        android:textSize="30sp"  
        android:text="0"/>

    <TextView  
        android:layout\_width="wrap\_content"  
        android:layout\_height="wrap\_content"  
        android:textColor="#7F00FF"  
        android:textSize="30sp"  
        android:text=":"/>

    <TextView  
        android:id="@+id/timestamp\_second\_prefix"  
        android:layout\_width="wrap\_content"  
        android:layout\_height="wrap\_content"  
        android:textColor="#7F00FF"  
        android:textSize="30sp"  
        android:text="0"/>

    <TextView  
        android:id="@+id/timestamp\_second\_text"  
        android:layout\_width="wrap\_content"  
        android:layout\_height="wrap\_content"  
        android:textColor="#7F00FF"  
        android:textSize="30sp"  
        android:text="0"/>  
</LinearLayout>

<ImageButton  
    android:id="@+id/record\_shutter"  
    android:layout\_width="64dp"  
    android:layout\_height="64dp"  
    android:layout\_alignParentBottom="true"  
    android:layout\_centerHorizontal="true"  
    android:layout\_marginBottom="15dp"  
    android:background="@android:color/transparent"  
    android:scaleType="centerCrop"  
    android:src="@drawable/recording\_shutter" />

MainActivity.java

package com.jackie.videorecorder;

import java.io.File;

import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.Size;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MainActivity extends Activity implements OnClickListener {
private SurfaceView mCameraPreview;
private SurfaceHolder mSurfaceHolder;
private ImageButton mShutter;
private TextView mMinutePrefix;
private TextView mMinuteText;
private TextView mSecondPrefix;
private TextView mSecondText;

private Camera mCamera;  
private MediaRecorder mRecorder;

private final static int CAMERA\_ID = 0;

private boolean mIsRecording = false;  
private boolean mIsSufaceCreated = false;

private static final String TAG = "Jackie";

private Handler mHandler = new Handler();

@Override  
protected void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.activity\_main);

    mCameraPreview = (SurfaceView) findViewById(R.id.camera\_preview);  
    mMinutePrefix = (TextView) findViewById(R.id.timestamp\_minute\_prefix);  
    mMinuteText = (TextView) findViewById(R.id.timestamp\_minute\_text);  
    mSecondPrefix = (TextView) findViewById(R.id.timestamp\_second\_prefix);  
    mSecondText = (TextView) findViewById(R.id.timestamp\_second\_text);

    mSurfaceHolder = mCameraPreview.getHolder();  
    mSurfaceHolder.addCallback(mSurfaceCallback);  
    mSurfaceHolder.setType(SurfaceHolder.SURFACE\_TYPE\_PUSH\_BUFFERS);

    mShutter = (ImageButton) findViewById(R.id.record\_shutter);  
    mShutter.setOnClickListener(this);  
}

@Override  
protected void onPause() {  
    super.onPause();  
    if (mIsRecording) {  
        stopRecording();  
    }  
    stopPreview();  
}

private  SurfaceHolder.Callback mSurfaceCallback = new SurfaceHolder.Callback() {

    @Override  
    public void surfaceDestroyed(SurfaceHolder holder) {  
        mIsSufaceCreated = false;  
    }

    @Override  
    public void surfaceCreated(SurfaceHolder holder) {  
        mIsSufaceCreated = true;  
    }

    @Override  
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {  
        startPreview();  
    }  
};

//启动预览  
private void startPreview() {  
    //保证仅仅有一个Camera对象  
    if (mCamera != null || !mIsSufaceCreated) {  
        Log.d(TAG, "startPreview will return");  
        return;  
    }

    mCamera = Camera.open(CAMERA\_ID);

    Parameters parameters = mCamera.getParameters();  
    Size size = getBestPreviewSize(CameraUtils.PREVIEW\_WIDTH, CameraUtils.PREVIEW\_HEIGHT, parameters);  
    if (size != null) {  
        parameters.setPreviewSize(size.width, size.height);  
    }

    parameters.setFocusMode(Parameters.FOCUS\_MODE\_CONTINUOUS\_VIDEO);  
    parameters.setPreviewFrameRate(20);

    //设置相机预览方向  
    mCamera.setDisplayOrientation(90);

    mCamera.setParameters(parameters);

    try {  
        mCamera.setPreviewDisplay(mSurfaceHolder);  

// mCamera.setPreviewCallback(mPreviewCallback);
} catch (Exception e) {
Log.d(TAG, e.getMessage());
}

    mCamera.startPreview();  
}

private void stopPreview() {  
    //释放Camera对象  
    if (mCamera != null) {  
        try {  
            mCamera.setPreviewDisplay(null);  
        } catch (Exception e) {  
            Log.e(TAG, e.getMessage());  
        }

        mCamera.stopPreview();  
        mCamera.release();  
        mCamera = null;  
    }  
}

private Camera.Size getBestPreviewSize(int width, int height, Camera.Parameters parameters) {  
    Camera.Size result = null;

    for (Camera.Size size : parameters.getSupportedPreviewSizes()) {  
        if (size.width <= width && size.height <= height) {  
            if (result == null) {  
                result = size;  
            } else {  
                int resultArea = result.width \* result.height;  
                int newArea = size.width \* size.height;

                if (newArea > resultArea) {  
                    result = size;  
                }  
            }  
        }  
    }

    return result;  
}

@Override  
public void onClick(View v) {  
    if (mIsRecording) {  
        stopRecording();  
    } else {  
        initMediaRecorder();  
        startRecording();

        //開始录像后，每隔1s去更新录像的时间戳  
        mHandler.postDelayed(mTimestampRunnable, 1000);  
    }  
}

private void initMediaRecorder() {  
    mRecorder = new MediaRecorder();//实例化  
    mCamera.unlock();  
    //给Recorder设置Camera对象，保证录像跟预览的方向保持一致  
    mRecorder.setCamera(mCamera);  
    mRecorder.setOrientationHint(90);  //改变保存后的视频文件播放时是否横屏(不加这句。视频文件播放的时候角度是反的)  
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); // 设置从麦克风採集声音  
    mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); // 设置从摄像头採集图像  
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG\_4);  // 设置视频的输出格式 为MP4  
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); // 设置音频的编码格式  
    mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); // 设置视频的编码格式  
    mRecorder.setVideoSize(176, 144);  // 设置视频大小  
    mRecorder.setVideoFrameRate(20); // 设置帧率  

// mRecorder.setMaxDuration(10000); //设置最大录像时间为10s
mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());

    //设置视频存储路径  
    File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY\_MOVIES) + File.separator + "VideoRecorder");  
    if (!file.exists()) {  
        //多级目录的创建  
        file.mkdirs();  
    }  
    mRecorder.setOutputFile(file.getPath() + File.separator + "VID\_" + System.currentTimeMillis() + ".mp4");  
}

private void startRecording() {  
    if (mRecorder != null) {  
        try {  
            mRecorder.prepare();  
            mRecorder.start();  
        } catch (Exception e) {  
            mIsRecording = false;  
            Log.e(TAG, e.getMessage());  
        }  
    }

    mShutter.setImageDrawable(getResources().getDrawable(R.drawable.recording\_shutter\_hl));  
    mIsRecording = true;  
}

private void stopRecording() {  
    if (mCamera != null) {  
        mCamera.lock();  
    }

    if (mRecorder != null) {  
        mRecorder.stop();  
        mRecorder.release();  
        mRecorder = null;  
    }

    mShutter.setImageDrawable(getResources().getDrawable(R.drawable.recording\_shutter));  
    mIsRecording = false;

    mHandler.removeCallbacks(mTimestampRunnable);

    //将录像时间还原  
    mMinutePrefix.setVisibility(View.VISIBLE);  
    mMinuteText.setText("0");  
    mSecondPrefix.setVisibility(View.VISIBLE);  
    mSecondText.setText("0");

    //重新启动预览  
    startPreview();  
}

private Runnable mTimestampRunnable = new Runnable() {  
    @Override  
    public void run() {  
        updateTimestamp();  
        mHandler.postDelayed(this, 1000);  
    }  
};

private void updateTimestamp() {  
    int second = Integer.parseInt(mSecondText.getText().toString());  
    int minute = Integer.parseInt(mMinuteText.getText().toString());  
    second++;  
    Log.d(TAG, "second: " + second);

    if (second < 10) {  
        mSecondText.setText(String.valueOf(second));  
    } else if (second >= 10 && second < 60) {  
        mSecondPrefix.setVisibility(View.GONE);  
        mSecondText.setText(String.valueOf(second));  
    } else if (second >= 60) {  
        mSecondPrefix.setVisibility(View.VISIBLE);  
        mSecondText.setText("0");

        minute++;  
        mMinuteText.setText(String.valueOf(minute));  
    } else if (minute >= 60) {  
        mMinutePrefix.setVisibility(View.GONE);  
    }  
}  

}

效果例如以下：