Android 从Camera获取视频数据用SurfaceView显示

1、自定义一个SurfaceView

package com.test.camera.preview;

import android.content.Context;
import android.graphics.PixelFormat;
import android.hardware.Camera.CameraInfo;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import com.test.camera.CameraInterface;
import com.test.observer.FrameCallback;

public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
Context mContext;
SurfaceHolder mSurfaceHolder;

public CameraSurfaceView(Context context, AttributeSet attrs) {    super(context, attrs);    mContext = context;    mSurfaceHolder = getHolder();    mSurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);//translucent半透明 transparent透明    mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    mSurfaceHolder.addCallback(this);}@Overridepublic void surfaceCreated(SurfaceHolder holder) {    CameraInterface.getInstance().doOpenCamera(null, CameraInfo.CAMERA_FACING_BACK);}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,                           int height) {    CameraInterface.getInstance().doStartPreview(mSurfaceHolder, 1.333f);}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {    CameraInterface.getInstance().doStopCamera();}public SurfaceHolder getSurfaceHolder() {    return mSurfaceHolder;}public void setFrameCallback(FrameCallback fcb) {    CameraInterface.getInstance().setFrameCallback(fcb);}

}

2、封装一个CameraInterface类来操作Camera的打开、预览、获取数据等
package com.test.camera;

import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.view.SurfaceHolder;

import com.test.observer.FrameCallback;

import java.io.IOException;

public class CameraInterface {
private Camera mCamera;
private Camera.Parameters mParams;
private boolean isPreviewing = false;
private static CameraInterface mCameraInterface;
private FrameCallback fcb;
private int mCameraId = -1;

public void setFrameCallback(FrameCallback fcb) {    this.fcb = fcb;}public interface CamOpenOverCallback {    void cameraHasOpened();}private CameraInterface() {}public static synchronized CameraInterface getInstance() {    if (mCameraInterface == null) {        mCameraInterface = new CameraInterface();    }    return mCameraInterface;}/** * 打开Camera * * @param callback */public void doOpenCamera(CamOpenOverCallback callback, int cameraId) {    mCamera = Camera.open(cameraId);//0后置  1前置    if (callback != null) {        callback.cameraHasOpened();    }}/** * 开启预览 * * @param holder * @param previewRate */public void doStartPreview(SurfaceHolder holder, float previewRate) {    if (isPreviewing) {        mCamera.stopPreview();        return;    }    if (mCamera != null) {        mParams = mCamera.getParameters();        mCamera.setParameters(mParams);        try {            mCamera.setPreviewDisplay(holder);            mCamera.startPreview();//开启预览        } catch (IOException e) {            e.printStackTrace();        }        isPreviewing = true;        mParams = mCamera.getParameters(); //重新get一次        mCamera.setPreviewCallback(mJpegPreviewCallback);    }}/** * 停止预览，释放Camera */public void doStopCamera() {    if (null != mCamera) {        mCamera.setPreviewCallback(null);        mCamera.stopPreview();        isPreviewing = false;        mCamera.release();        mCamera = null;    }}

/**
* 获取Camera的数据，
*/
PreviewCallback mJpegPreviewCallback = new PreviewCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
//传递进来的data,默认是YUV420SP的
fcb.onDecodeFrame(data);
}
};

/** * 获取Camera.Parameters * * @return */public Camera.Parameters getCameraParams() {    if (mCamera != null) {        mParams = mCamera.getParameters();        return mParams;    }    return null;}/** * 获取Camera实例 * * @return */public Camera getCameraDevice() {    return mCamera;}public int getCameraId() {    return mCameraId;}

}

4、在xml中用写好的自定义SurfaceView

<com.test.camera.preview.CameraSurfaceView        android:id="@+id/surfaceview"        android:layout_width="match_parent"        android:layout_height="match_parent"/>

5、添加照相机的相关权限

<!-- 增加文件存储和访问摄像头的权限 --><uses-feature android:name="android.hardware.camera"/><uses-feature android:name="android.hardware.camera.autofocus"/><uses-feature android:glEsVersion="0x00020000"/><uses-permission android:name="android.permission.CAMERA"/><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

6、至此就可以正常显示预览视频啦