android camera 通过onPreviewFrame采集视频

001package com.example.camera;

002 

003import java.io.File;

004import java.io.FileOutputStream;

005import java.io.IOException;

006import java.text.SimpleDateFormat;

007import java.util.Date;

008 

009import android.app.Activity;

010import android.graphics.Rect;

011import android.graphics.YuvImage;

012import android.hardware.Camera;

013import android.hardware.Camera.Size;

014import android.os.Bundle;

015import android.os.Environment;

016import android.view.SurfaceHolder;

017import android.view.SurfaceView;

018 

019public class MainActivity extends Activity implements SurfaceHolder.Callback,

020        Camera.PreviewCallback {

021 

022    private SurfaceView mSurfaceview = null; // SurfaceView对象：(视图组件)视频显示

023    private SurfaceHolder mSurfaceHolder = null; // SurfaceHolder对象：(抽象接口)SurfaceView支持类

024    private Camera mCamera = null; // Camera对象，相机预览

025 

026    @Override

027    public void onCreate(Bundle savedInstanceState) {

028        super.onCreate(savedInstanceState);

029        setContentView(R.layout.main);

030        mSurfaceview = (SurfaceView) findViewById(R.id.surfaceview);

031        mSurfaceHolder = mSurfaceview.getHolder(); // 绑定SurfaceView，取得SurfaceHolder对象

032        mSurfaceHolder.addCallback(this); // SurfaceHolder加入回调接口

033        // mSurfaceHolder.setFixedSize(176, 144); // 预览大小設置

034        mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 設置顯示器類型，setType必须设置

035    }

036 

037    @Override

038    public void surfaceChanged(SurfaceHolder holder, int format, int width,

039            int height) {

040        if (mCamera == null) {

041            return;

042        }

043        mCamera.stopPreview();

044        mCamera.setPreviewCallback(this);

045        mCamera.startPreview();

046    }

047 

048    @Override

049    protected void onResume() {

050        super.onResume();

051        mCamera = Camera.open();

052    }

053 

054    @Override

055    protected void onPause() {

056        super.onPause();

057        if (mCamera != null) {

058            mCamera.release();

059            mCamera = null;

060        }

061    }

062 

063    @Override

064    public void surfaceCreated(SurfaceHolder holder) {

065        try {

066            if (mCamera != null) {

067                mCamera.setPreviewDisplay(mSurfaceHolder);

068                mCamera.startPreview();

069            }

070        } catch (IOException e) {

071            e.printStackTrace();

072        }

073 

074    }

075 

076    @Override

077    public void surfaceDestroyed(SurfaceHolder holder) {

078 

079    }

080 

081    @Override

082    public void onPreviewFrame(byte[] data, Camera camera) {

083 

084        // 刚刚拍照的文件名

085        String fileName = "IMG_"

086                + new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date())

087                        .toString() + ".jpg";

088        File sdRoot = Environment.getExternalStorageDirectory();

089        String dir = "/Camera/";

090        File mkDir = new File(sdRoot, dir);

091        if (!mkDir.exists())

092            mkDir.mkdirs();

093        File pictureFile = new File(sdRoot, dir + fileName);

094        if (!pictureFile.exists()) {

095            try {

096                pictureFile.createNewFile();

097                Camera.Parameters parameters = camera.getParameters();

098                Size size = parameters.getPreviewSize();

099                YuvImage image = new YuvImage(data,

100                        parameters.getPreviewFormat(), size.width, size.height,

101                        null);

102                FileOutputStream filecon = new FileOutputStream(pictureFile);

103                image.compressToJpeg(

104                        new Rect(0, 0, image.getWidth(), image.getHeight()),

105                        90, filecon);

106            } catch (IOException e) {

107                e.printStackTrace();

108            }

109        }

110    }

111}

转自：http://my.oschina.net/eclipse88/blog/80115

参考：

http://www.cnblogs.com/mengyan/archive/2012/09/01/2666641.html

http://www.cnblogs.com/sight/archive/2012/04/17/2453671.html

http://www.cnblogs.com/ice4c/archive/2010/10/18/1854756.html