我正在尝试为相机构建一个带有连拍模式的小型照片应用程序。主要思想是每 0.3 秒拍摄一张照片,并将照片存储在数组中,直到拍摄最后一张照片。应指定要拍摄的照片数量。
我每 2 秒只能拍摄一张照片。作为最短间隔。然后,当应该将图片写入存储时,应用程序崩溃了。
有人知道如何实现吗?这是我的代码:
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
public class CamaeaView extends Activity implements SurfaceHolder.Callback, OnClickListener {
static final int FOTO_MODE = 1;
private static final String TAG = "Test";
Camera mCamera;
boolean mPreviewRunning = false;
private Context mContext = this;
ArrayList<Object> listImage = null;
public static ArrayList<Object> List1[];
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
Log.e(TAG, "onCreate");
@SuppressWarnings("unused")
Bundle extras = getIntent().getExtras();
getWindow().setFormat(PixelFormat.TRANSLUCENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera);
mSurfaceView.setOnClickListener(this);
mSurfaceHolder = mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
}
Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] imageData, Camera c) {
Log.d("Start: ","Imagelist");
Intent mIntent = new Intent();
listImage.add(StoreByteImage(imageData));
SaveImage(listImage);
mCamera.startPreview();
setResult(FOTO_MODE, mIntent);
finish();
}
};
protected void onResume() {
Log.d(TAG, "onResume");
super.onResume();
}
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
protected void onStop() {
Log.e(TAG, "onStop");
super.onStop();
}
public void surfaceCreated(SurfaceHolder holder) {
Log.d(TAG, "surfaceCreated");
mCamera = Camera.open();
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Log.d(TAG, "surfaceChanged");
// XXX stopPreview() will crash if preview is not running
if (mPreviewRunning) {
mCamera.stopPreview();
}
Camera.Parameters p = mCamera.getParameters();
p.setPreviewSize(w, h);
p.setPictureSize(1024, 768);
p.getSupportedPictureFormats();
p.setPictureFormat(PixelFormat.JPEG);
mCamera.setParameters(p);
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mCamera.startPreview();
mPreviewRunning = true;
}
public void surfaceDestroyed(SurfaceHolder holder) {
Log.e(TAG, "surfaceDestroyed");
mCamera.stopPreview();
mPreviewRunning = false;
mCamera.release();
}
private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
public void onClick(View arg0) {
int i = 0;
while (i < 4) {
mCamera.takePicture(null, mPictureCallback, mPictureCallback);
i = i + 1;
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static Object StoreByteImage(byte[] imageData) {
Object obj = null;
try {
ByteArrayInputStream bis = new ByteArrayInputStream(imageData);
ObjectInputStream objImageData = new ObjectInputStream(bis);
obj = objImageData.readObject();
} catch (IOException ex) {
// TODO: Handle the exception
} catch (ClassNotFoundException ex) {
// TODO: Handle the exception
}
return obj;
}
public static Object createImagesArray(byte[] imageData) {
Object obj = null;
try {
ByteArrayInputStream bis = new ByteArrayInputStream(imageData);
ObjectInputStream objImageData = new ObjectInputStream(bis);
obj = objImageData.readObject();
} catch (IOException ex) {
// TODO: Handle the exception
} catch (ClassNotFoundException ex) {
// TODO: Handle the exception
}
return obj;
}
public static boolean SaveImage(List<Object> listImage) {
FileOutputStream outStream = null;
Log.d("ListSize: ", Integer.toString(listImage.size()));
Iterator<Object> itList = listImage.iterator();
byte[] imageBytes = null;
while (itList.hasNext()) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(listImage);
oos.flush();
oos.close();
bos.close();
imageBytes = bos.toByteArray();
} catch (IOException ex) {
// TODO: Handle the exception
}
try {
// Write to SD Card
outStream = new FileOutputStream(String.format(
"/sdcard/DCIM/%d.jpg", System.currentTimeMillis())); // <9>
outStream.write(imageBytes);
outStream.close();
} catch (FileNotFoundException e) { // <10>
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
}
Log.d(TAG, "onPictureTaken - jpeg");
return true;
}
}
评论错误:
ERROR/MemoryHeapBase(1382): error opening /dev/pmem_camera: No such file or directory
ERROR/QualcommCameraHardware(1382): failed to construct master heap for pmem pool /dev/pmem_camera
ERROR/QualcommCameraHardware(1382): initRaw X failed with pmem_camera, trying with pmem_adsp
最佳答案
据我所知,在第一张照片完成之前,您不能再拍另一张照片。消除 for
循环和 Thread.sleep()
。在 mPictureCallback
中拍摄下一张照片。
The main idea is to shoot a picture every 0,3sec and to store the pictures in an Array until the last picture is taken.
“0.3 秒”目标比大多数设备处理图像的速度更快,并且您可能没有足够的堆空间来容纳图像数组。我怀疑您必须在每个图像通过 AsyncTask
传入时将其写出到磁盘,这样您就可以释放堆空间,同时也不会占用主应用程序线程。
关于java - 如何使连拍模式可用于相机,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6889271/