Android 实时视频采集—Cameara预览采集
贴点代码，测试没有问题，详解请看下面链接
http://www.cnblogs.com/skyseraph/archive/2012/03/26/2418665.html
//mainActivity.java
package com.example;
import java.util.List;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.hardware.Camera.Size;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class mainActivity extends Activity implements SurfaceHolder.Callback{
/* 【SurfaceHolder.Callback 回调函数】 */
public void surfaceCreated(SurfaceHolder holder)
// SurfaceView启动时/初次实例化，预览界面被创建时，该方法被调用。
{
// TODO Auto-generated method stub
mCamera = Camera.open();// 开启摄像头（2.3版本后支持多摄像头,需传入参数）
try {
Log.i(TAG, "SurfaceHolder.Callback：surface Created");
mCamera.setPreviewDisplay(mSurfaceHolder);// set the surface to be
// used for live preview
} catch (Exception ex) {
if (null != mCamera) {
mCamera.release();
mCamera = null;
}
Log.i(TAG, "initCamera" + ex.getMessage());
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
// 当SurfaceView/预览界面的格式和大小发生改变时，该方法被调用
{
// TODO Auto-generated method stub
Log.i(TAG, "SurfaceHolder.Callback：Surface Changed");
// mPreviewHeight = height;
// mPreviewWidth = width;
initCamera();
}
public void surfaceDestroyed(SurfaceHolder holder)
// SurfaceView销毁时，该方法被调用
{
// TODO Auto-generated method stub
Log.i(TAG, "SurfaceHolder.Callback：Surface Destroyed");
if (null != mCamera) {
mCamera.setPreviewCallback(null); // ！！这个必须在前，不然退出出错
mCamera.stopPreview();
bIfPreview = false;
mCamera.release();
mCamera = null;
}
}
/* 【2】【相机预览】 */
private void initCamera()// surfaceChanged中调用
{
Log.i(TAG, "going into initCamera");
if (bIfPreview) {
mCamera.stopPreview();// stopCamera();
}
if (null != mCamera) {
try {
/* Camera Service settings */
Camera.Parameters parameters = mCamera.getParameters();
// parameters.setFlashMode("off"); // 无闪光灯
parameters.setPictureFormat(PixelFormat.JPEG); // Sets the image
// format for
// picture
// 设定相片格式为JPEG，默认为NV21
parameters.setPreviewFormat(PixelFormat.YCbCr_420_SP); // Sets
// the
// image
// format
// for
// preview
// picture，默认为NV21
/*
* 【ImageFormat】JPEG/NV16(YCrCb format，used for
* Video)/NV21(YCrCb format，used for Image)/RGB_565/YUY2/YU12
*/
// 【调试】获取caera支持的PictrueSize，看看能否设置？？
List<Size> pictureSizes = mCamera.getParameters()
.getSupportedPictureSizes();
List<Size> previewSizes = mCamera.getParameters()
.getSupportedPreviewSizes();
List<Integer> previewFormats = mCamera.getParameters()
.getSupportedPreviewFormats();
List<Integer> previewFrameRates = mCamera.getParameters()
.getSupportedPreviewFrameRates();
Log.i(TAG, "initCamera cyy support parameters is ");
Size psize = null;
for (int i = 0; i < pictureSizes.size(); i++) {
psize = pictureSizes.get(i);
Log.i(TAG, "initCamera PictrueSize,width: "
+ psize.width + " height" + psize.height);
}
for (int i = 0; i < previewSizes.size(); i++) {
psize = previewSizes.get(i);
Log.i(TAG, "initCamera PreviewSize,width: "
+ psize.width + " height" + psize.height);
}
Integer pf = null;
for (int i = 0; i < previewFormats.size(); i++) {
pf = previewFormats.get(i);
Log.i(TAG, "initCamera previewformates:" + pf);
}
// 设置拍照和预览图片大小
parameters.setPictureSize(320, 240);//(640, 480); // 指定拍照图片的大小
parameters.setPreviewSize(mPreviewWidth, mPreviewHeight); // 指定preview的大小
// 这两个属性 如果这两个属性设置的和真实手机的不一样时，就会报错
// 横竖屏镜头自动调整
if (this.getResources().getConfiguration().orientation != ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
parameters.set("orientation", "portrait"); //
parameters.set("rotation", 90); // 镜头角度转90度（默认摄像头是横拍）
mCamera.setDisplayOrientation(90); // 在2.2以上可以使用
} else// 如果是横屏
{
parameters.set("orientation", "landscape"); //
mCamera.setDisplayOrientation(0); // 在2.2以上可以使用
}
/* 视频流编码处理 */
// 添加对视频流处理函数
mCamera.setPreviewCallback(mJpegPreviewCallback);
// 设定配置参数并开启预览
mCamera.setParameters(parameters); // 将Camera.Parameters设定予Camera
mCamera.startPreview(); // 打开预览画面
bIfPreview = true;
// 【调试】设置后的图片大小和预览大小以及帧率
Camera.Size csize = mCamera.getParameters().getPreviewSize();
mPreviewHeight = csize.height; //
mPreviewWidth = csize.width;
Log.i(TAG, "initCamera after setting, previewSize:width: "
+ csize.width + " height: " + csize.height);
csize = mCamera.getParameters().getPictureSize();
Log.i(TAG, "initCamera after setting, pictruesize:width: "
+ csize.width + " height: " + csize.height);
Log.i(TAG, "initCamera after setting, previewformate is "
+ mCamera.getParameters().getPreviewFormat());
Log.i(TAG, "initCamera after setting, previewFrameRate is "
+ mCamera.getParameters().getPreviewFrameRate());
} catch (Exception e) {
e.printStackTrace();
}
}
}
// 【获取视频预览帧的接口】
PreviewCallback mJpegPreviewCallback = new Camera.PreviewCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
// 传递进来的data,默认是YUV420SP的
// TODO Auto-generated method stub
try {
// Log.i(TAG, "going into onPreviewFrame");
/*
* //shadowed by chengning 2012-4-25 //mYUV420sp = data; //
* 获取原生的YUV420SP数据 YUVIMGLEN = data.length;
*
* // 拷贝原生yuv420sp数据 mYuvBufferlock.acquire();
* System.arraycopy(data, 0, mYUV420SPSendBuffer, 0,
* data.length); //System.arraycopy(data, 0, mWrtieBuffer, 0,
* data.length); mYuvBufferlock.release();
*
* // 开启编码线程，如开启PEG编码方式线程 mSendThread1.start();
*/
} catch (Exception e) {
Log.v("System.out", e.toString());
}// endtry
}// endonPriview
};
// InitSurfaceView
private void initSurfaceView() {
mSurfaceview = (SurfaceView) this.findViewById(R.id.Surfaceview);
mSurfaceHolder = mSurfaceview.getHolder(); // 绑定SurfaceView，取得SurfaceHolder对象
mSurfaceHolder.addCallback(mainActivity.this); // SurfaceHolder加入回调接口
// mSurfaceHolder.setFixedSize(176, 144); // 预览大小設置
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 設置顯示器類型，setType必须设置
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initSurfaceView();
}
// 定义对象
private SurfaceView mSurfaceview = null; // SurfaceView对象：(视图组件)视频显示
private SurfaceHolder mSurfaceHolder = null; // SurfaceHolder对象：(抽象接口)SurfaceView支持类
private Camera mCamera =null; // Camera对象，相机预览
public static String TAG = "cn";
boolean bIfPreview = false;
int mPreviewHeight = 240;
int mPreviewWidth = 320;
}
//main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<SurfaceView
android:id="@+id/Surfaceview"
android:layout_width="320px"
android:layout_height="240px"
/>
</LinearLayout>