Question

我想通过应用程序用手机拍照并将图像保存在手机上。我已经尝试了在stackoverflow问题上提出的许多解决方案，但它没有标记，所以我构建了一个方法，用正确的名称保存文件......但文件是空的（0kb）！

这是我的代码

public class GameActivity extends Activity implements SurfaceHolder.Callback/*,Camera.PictureCallback*/ {

private Camera camera;
private SurfaceView surfaceCamera;
public Handler handler = new Handler(); 
private boolean isPreview=false;
private SurfaceHolder holder;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gameactivity);
    surfaceCamera = (SurfaceView) findViewById(R.id.surfaceViewCamera);
    getWindow().setFormat(PixelFormat.UNKNOWN);
    holder = surfaceCamera.getHolder();
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    ImageView image = (ImageView) findViewById(R.id.imageView3);
    image.setOnTouchListener(new OnTouchListener(){

        @Override
        public boolean onTouch(View arg0, MotionEvent arg1) {
   camera.takePicture(myShutterCallback, myPictureCallback_RAW, myPictureCallback_JPG);     
            return false;

}


Camera.ShutterCallback myShutterCallback = new Camera.ShutterCallback() {
    public void onShutter() {
      // TODO bl
    }
  };

PictureCallback myPictureCallback_RAW = new PictureCallback() {

    public void onPictureTaken(byte[] arg0, Camera arg1) {
        // TODO Auto-generated method stub

    }
};


PictureCallback myPictureCallback_JPG = new PictureCallback(){

    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
            File imagesFolder = new File(Environment.getExternalStorageDirectory(), "/KersplattFolder");
            imagesFolder.mkdirs(); 
            String fileName = "image.jpg";
            File output = new File(imagesFolder, fileName);
            try {
                FileOutputStream fos = new FileOutputStream(output);
                fos.write(data[0]);
                fos.close();
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

                Toast.makeText(GameActivity.this, 
                        "Image saved: ", 
                        Toast.LENGTH_LONG).show();
            camera.startPreview();
            }
};


@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    if (isPreview) {
        camera.stopPreview();
    }
    Camera.Parameters p = camera.getParameters();
    p.setPreviewSize(width,height);
    camera.setParameters(p);
    try {
        camera.setPreviewDisplay(holder);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    camera.startPreview();
    isPreview=true;
}


@Override
public void surfaceCreated(SurfaceHolder holder) {
    camera = Camera.open();

}


@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    camera.stopPreview();
    isPreview=false;
    camera.release();

}

EDIT1 ：当我输入数据而不是数据[0]时，我也保存了黑色图像，但文件有重量，所以我猜真实的图像在某个地方......

EDIT2 我添加了代码

                File output = new File(imagesFolder, fileName);
            Uri outputFileUri = Uri.fromFile(output);
            String filePath = outputFileUri.getPath();
            File file= new File(filePath);
            try {
                FileOutputStream fos = new FileOutputStream(file,true);
                fos.write(data);
                fos.close();
            }

还有黑色图片

Answer 1

您是否在Android清单中定义了所需权限，如here所述？

<manifest ... >
    <uses-feature android:name="android.hardware.camera" />
    ...
</manifest ... >

<强>更新好的，删除数据后的括号：数据而不是数据[]。然后它应该工作。

Answer 2

您的代码：fos.write（data [0]）;是错的。我很惊讶你没有得到例外

这是我用来在拍照后保存字节数组的代码。 “data”是字节数组。

String filePath = outputFileUri.getPath(); // .getEncodedPath();
    File file = new File(filePath);
    FileOutputStream os;
    try {
        os = new FileOutputStream(file, true);
        os.write(data);
        os.close();
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Android：在SD卡上拍照并保存图片

2 个答案: