通过相机获取最近捕获的图像的路径和图像名称

Posted

技术标签:

【中文标题】通过相机获取最近捕获的图像的路径和图像名称【英文标题】:Get path and imagename of recently captured image through camera 【发布时间】:2012-10-29 11:59:37 【问题描述】:

我必须将捕获的图像上传到 ftp 服务器。我正在通过相机捕获图像,我想获取该图像的图像名称和路径。我正在使用以下代码获取图像路径:

int ACTION_TAKE_PICTURE = 1;
String selectedImagePath;
Uri mCapturedImageURI;

Button loadButton;
ImageView img;
@Override
public void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_new_ftpsdemo);
     img = (ImageView)findViewById(R.id.image);

    ContentValues values = new ContentValues();
    values.put(MediaStore.Images.Media.TITLE, "yahoo.jpg");
    mCapturedImageURI  = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
    Intent intentPicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    intentPicture.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
    startActivityForResult(intentPicture,ACTION_TAKE_PICTURE);


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    if(requestCode == ACTION_TAKE_PICTURE)
        selectedImagePath = getRealPathFromURI(mCapturedImageURI);
        Log.v("selectedImagePath", selectedImagePath);
        img.setImageBitmap( BitmapFactory.decodeFile(selectedImagePath));
    



public String getRealPathFromURI(Uri contentUri)
    
        try
        
            String[] proj = MediaStore.Images.Media.DATA;
            Cursor cursor = managedQuery(contentUri, proj, null, null, null);
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        
        catch (Exception e)
        
            return contentUri.getPath();
        
    

但我得到这样的图像路径:

/mnt/sdcard/DCIM/Camera/1352443194885.jpg

因为我正在保存名称“yahoo.jpg”。 我知道这可能是一个非常简单的问题,但我无法获得相同的图像名和路径。 所以我无法将图像上传到 ftp 服务器。

【问题讨论】:

如果您愿意将相机中的图像存储在自己的文件夹中,我可能会为您提供解决方案。 我随时欢迎任何解决方案.. 只是我想要捕获图像的完整路径和图像名称。 你是怎么解决这个问题的? @kamil 我已经在下面发布了解决方案。它对我有用。 @Umesh 好问题,它对我有帮助谢谢:) 【参考方案1】:

检查这个...把它放在你的 onActivityResult 中

           Uri selectedImage = intent.getData();

           String[] filePathColumn = MediaStore.Images.Media.DATA;
           Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
           cursor.moveToFirst();
           int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
           String filePath = cursor.getString(columnIndex);
           Log.v("log","filePath is : "+filePath); 

【讨论】:

【参考方案2】:

创建路径时,您只是保存“标题”。您没有给出相机应该用来存储的实际路径和文件名。由于此相机将文件存储在您提供的“标题”的默认位置。

您在代码中一切正常,但只需执行以下操作以获得相同的文件名:

相对于:

ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, "yahoo.jpg");
mCapturedImageURI  =  getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);

使用这个:

    StringBuilder path = new StringBuilder();
    path.append(Environment.getExternalStorageDirectory());
    path.append(// any location say "/Pictures/" //); // Do check if the folder is present. Else create one.
    path.append("yahoo");
        path.append(".jpg");
    File file = new File(path.toString());
    mCapturedImageURI = Uri.fromFile(file);

【讨论】:

【参考方案3】:

使用它来启动相机的 Intent:

哦。 Uri targetURI 是一个全局声明。

Intent getCameraImage = new Intent("android.media.action.IMAGE_CAPTURE");

File cameraFolder;

if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
    cameraFolder = new File(android.os.Environment.getExternalStorageDirectory(),"your_app_name/camera");
else
    cameraFolder= StatusUpdate.this.getCacheDir();
if(!cameraFolder.exists())
    cameraFolder.mkdirs();

File photo = new File(Environment.getExternalStorageDirectory(), "your_app_name/camera/camera_snap.jpg");
getCameraImage.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photo));
targetURI = Uri.fromFile(photo);

startActivityForResult(getCameraImage, 1);

而在onActivityResult()

getContentResolver().notifyChange(targetURI, null);

ContentResolver cr = getContentResolver();

try        
    // SET THE IMAGE FROM THE CAMERA TO THE IMAGEVIEW
    bmpImageCamera = android.provider.MediaStore.Images.Media.getBitmap(cr, targetURI);

    // SET THE IMAGE FROM THE GALLERY TO THE IMAGEVIEW
    imgvwSelectedImage.setImageBitmap(bmpImageCamera);

 catch (Exception e) 
    e.printStackTrace();

这段代码使用您选择的名称创建一个文件夹。您可以在此处更改文件夹名称:new File(android.os.Environment.getExternalStorageDirectory(),"your_app_name/camera");

此外,每次调用 Intent 以获取相机图像时,这都会覆盖 camera_snap.jpg

此代码不考虑内存不足异常,而只是演示如何将相机图像返回到您的应用程序。

编辑:差点忘了。如果您还没有这样做,您需要将此权限添加到您的Manifest.xml<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

【讨论】:

【参考方案4】:

我已经用下面的代码解决了这个问题。它对我有用。

我已经参考了这个链接:here

只需要将文件路径和 imageName 设为全局变量

MyCameraActivity.java

public class MyCameraActivity extends Activity 
private Camera mCamera;
private CameraPreview mCameraPreview;
public static String imageFilePath;
public static String imageName;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mCamera = getCameraInstance();
    mCameraPreview = new CameraPreview(this, mCamera);
    FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
    preview.addView(mCameraPreview);

    Button captureButton = (Button) findViewById(R.id.button_capture);
    captureButton.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 
            mCamera.takePicture(null, null, mPicture);
        
    );


/**
 * Helper method to access the camera returns null if it cannot get the
 * camera or does not exist
 * 
 * @return
 */
private Camera getCameraInstance() 
    Camera camera = null;
    try 
        camera = Camera.open();
     catch (Exception e) 
        // cannot get camera or does not exist
    
    return camera;


PictureCallback mPicture = new PictureCallback() 
    @Override
    public void onPictureTaken(byte[] data, Camera camera) 
        File pictureFile = getOutputMediaFile();
        if (pictureFile == null) 
            return;
        
        try 
            FileOutputStream fos = new FileOutputStream(pictureFile);
            fos.write(data);
            fos.close();
         catch (FileNotFoundException e) 

         catch (IOException e) 
        
    
;

private static File getOutputMediaFile() 
    File filePath = new File(
            Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
            "MyCameraApp");

    if (!mediaStorageDir.exists()) 
        if (!mediaStorageDir.mkdirs()) 
            Log.d("MyCameraApp", "failed to create directory");
            return null;
        
    
    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
            .format(new Date());
imageName = timeStamp +".jpg"; // name of captured image
    File mediaFile;
    mediaFile = new File(mediaStorageDir.getPath() + File.separator
            + imageName);
    imageFilePath = mediaFile.toString(); // you can get path of image saved
    return mediaFile;

CameraPreview.java:

public class CameraPreview extends SurfaceView implements
    SurfaceHolder.Callback 
private SurfaceHolder mSurfaceHolder;
private Camera mCamera;

// Constructor that obtains context and camera
@SuppressWarnings("deprecation")
public CameraPreview(Context context, Camera camera) 
    super(context);
    this.mCamera = camera;
    this.mSurfaceHolder = this.getHolder();
    this.mSurfaceHolder.addCallback(this);
    this.mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);


@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) 
    try 
        mCamera.setPreviewDisplay(surfaceHolder);
        mCamera.startPreview();
     catch (IOException e) 
        // left blank for now
    


@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) 
    mCamera.stopPreview();
    mCamera.release();


@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int format,
        int width, int height) 
    // start preview with new settings
    try 
        mCamera.setPreviewDisplay(surfaceHolder);
        mCamera.startPreview();
     catch (Exception e) 
        // intentionally left blank for a test
    

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:orientation="horizontal" >
<FrameLayout
    android:id="@+id/camera_preview"
    android:layout_
    android:layout_
    android:layout_weight="1" />
<Button
    android:id="@+id/button_capture"
    android:layout_
    android:layout_
    android:layout_gravity="center"
    android:text="Capture" />
</LinearLayout>

androidmanifyt.xml 中需要以下权限:

<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

现在我可以获取最近捕获的图像的 imageName 和 imagepath 并轻松将此图像上传到 ftp 服务器。

编码愉快。

【讨论】:

我使用此代码,但相机预览在 camerapreview 上显示错误。你有解决方案吗? 我在 preview.addView(mCameraPreview); 处得到一个空指针异常;请帮忙?

以上是关于通过相机获取最近捕获的图像的路径和图像名称的主要内容,如果未能解决你的问题,请参考以下文章

通过相机扫描图像和从相机捕获图像之间有啥不同吗?

保存自定义相机捕获图像 iOS Xcode

从相机拍照后图像未在 ImageView 中设置

通过相机捕获的图像质量丢失

从相机捕获图像并在活动中显示

从相机捕获图像并在活动中显示