demo实现功能：
打开主页面自动启动定时拍照，10s拍一次。
注意事项，初始化摄像头之后不能立即拍照，否则无效，必须等待几秒后才能拍。这里用的是Handler进行延时处理拍照消息的。
package com.feijian.takephotodemo; import java.io.File;
import java.io.FileOutputStream;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.Size;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.FrameLayout; /**
* 设置定时拍照功能
* @author huqiang
*
*/
public class InitTimetoTakePic { private static InitTimetoTakePic mInstance;
Activity mContext;
static FrameLayout mSurfaceViewFrame;
private static Camera mCamera;
private static CameraPreview mPreview; static String TAG = InitTimetoTakePic.class.getSimpleName();
private InitTimetoTakePic(Activity context)
{
this.mContext = context;
}
public synchronized static InitTimetoTakePic getInstance(Activity context)
{
if(mInstance ==null)
{
mInstance = new InitTimetoTakePic(context); }
return mInstance;
}
public void initView(FrameLayout surfaceViewFrame)
{
mSurfaceViewFrame = surfaceViewFrame;
}
/**
* 启动定时拍照并上传功能
*/
Handler mHandler = new Handler()
{
@Override
public void handleMessage(Message msg) {
switch(msg.what)
{
case 1:
Log.v(TAG, "开始拍照");
initCarema();
break;
case 2:
mCamera.autoFocus(new AutoFocusCallback() { @Override
public void onAutoFocus(boolean success, Camera camera) {
// 从Camera捕获图片
Log.v(TAG, "自动聚焦111"+success);
mCamera.takePicture(null, null, mPicture);
mHandler.sendEmptyMessageDelayed(1, 5*1000);
}
});
break;
}
}
};
public void start()
{
mHandler.sendEmptyMessageDelayed(1, 7*1000); //7s 后开始启动相机
}
private void initCarema()
{
Log.v(TAG, "initCarema");
if(mCamera==null)
{
Log.v(TAG, "camera=null");
mCamera = getCameraInstance();
mPreview = new CameraPreview(mContext, mCamera);
mSurfaceViewFrame.removeAllViews();
mSurfaceViewFrame.addView(mPreview);
}
Log.v(TAG, mCamera==null ?"mCamera is null":"mCamera is not null");
mCamera.startPreview();
mHandler.sendEmptyMessageDelayed(2, 3*1000); //3s后拍照
}
/** 检测设备是否存在Camera硬件 */
private boolean checkCameraHardware(Context context) {
if (context.getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA)) {
// 存在
return true;
} else {
// 不存在
return false;
}
} /** 打开一个Camera */
public static Camera getCameraInstance() {
Camera c = null;
try {
c = Camera.open();
c.setDisplayOrientation(90);
Camera.Parameters mParameters = c.getParameters();
//可以用得到当前所支持的照片大小，然后
List<Size> ms = mParameters.getSupportedPictureSizes();
mParameters.setPictureSize(ms.get(0).width, ms.get(0).height); //默认最大拍照取最大清晰度的照片
c.setParameters(mParameters);
} catch (Exception e) {
Log.d(TAG, "打开Camera失败失败");
}
return c;
} private PictureCallback mPicture = new PictureCallback() { @Override
public void onPictureTaken(byte[] data, Camera camera) {
// 获取Jpeg图片，并保存在sd卡上
String path = Environment.getExternalStorageDirectory().getAbsolutePath() +"/data/data/";
File dirF = new File(path);
if(!dirF.exists())
{
dirF.mkdirs();
}
File pictureFile = new File(path + System.currentTimeMillis()+ ".jpg");
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
Log.d(TAG, "保存图成功");
} catch (Exception e) {
Log.d(TAG, "保存图片失败");
e.printStackTrace();
}
releaseCarema();
}
};
public void releaseCarema()
{
if(mCamera!=null){
mCamera.stopPreview();
mCamera.release();
mCamera=null;
}
}
}