显示从相机拍摄的照片：android.graphics.BitmapFactory.nativeDecodeStream(Native Method) 处的 java.lang.OutOfMemory

Posted 2023-04-17

【中文标题】显示从相机拍摄的照片：android.graphics.BitmapFactory.nativeDecodeStream(Native Method) 处的 java.lang.OutOfMemoryError

【英文标题】：Showing picture taken from camera: java.lang.OutOfMemoryError at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)

【发布时间】：2017-06-06 08:42:12

【问题描述】：

我正在尝试显示相机拍摄的照片，有时它可以工作，但通常会给我错误：

java.lang.OutOfMemoryError
     at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
     at android.graphics.BitmapFactory.decodeStreamInternal(BitmapFactory.java:727)
     at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:703)
     at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:741)
     at android.provider.MediaStore$Images$Media.getBitmap(MediaStore.java:847)
     at com.dima.polimi.rentall.NewProduct.onActivityResult(NewProduct.java:207)
     at android.app.Activity.dispatchActivityResult(Activity.java:5773)
     at android.app.ActivityThread.deliverResults(ActivityThread.java:3710)
     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3757)
     at android.app.ActivityThread.access$1400(ActivityThread.java:170)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1352)
     at android.os.Handler.dispatchMessage(Handler.java:102)
     at android.os.Looper.loop(Looper.java:146)
     at android.app.ActivityThread.main(ActivityThread.java:5635)
     at java.lang.reflect.Method.invokeNative(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:515)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
     at dalvik.system.NativeStart.main(Native Method)

我已经尝试了多个问题的解决方案，但我从未成功过

这是我的代码：

mImageView.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 
            dispatchTakePictureIntent();
        
    );

dispatchTakePictureIntent

String mCurrentPhotoPath;

private void dispatchTakePictureIntent() 
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (cameraIntent.resolveActivity(getPackageManager()) != null) 
        // Create the File where the photo should go
        File photoFile = null;
        try 
            photoFile = createImageFile();
         catch (IOException ex) 
            // Error occurred while creating the File
            Log.i("", "IOException");
        
        // Continue only if the File was successfully created
        if (photoFile != null) 
            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
            startActivityForResult(cameraIntent, REQUEST_TAKE_PHOTO);
        
    


private File createImageFile() throws IOException 
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  // prefix
            ".jpg",         // suffix
            storageDir      // directory
    );

    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = "file:" + image.getAbsolutePath();
    return image;



@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) 
        try 
            Bitmap mImageBitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.parse(mCurrentPhotoPath));
            mImageView.setImageBitmap(mImageBitmap);
         catch (IOException e) 
            e.printStackTrace();
        
     

【问题讨论】：

使用image-loading library，例如Picasso，可以智能地对图像进行下采样以适应ImageView，因此占用的内存更少。它还将在后台线程上执行该工作，而不是在主应用程序线程上执行该工作，就像您在此处所做的那样（在发生这种情况时冻结您的 UI）。

@CommonsWare 我试过了，使用：Picasso.with(this).load(mCurrentPhotoPath).into(mImageView);但它不会加载它

mCurrentPhotoPath 既不是有效的文件系统路径，也不是有效的Uri。坚持image，并尝试使用File 对象。

photoFile = createImageFile();。您不应该自己创建该文件。将其留给相机应用程序。您应该只提供名称/uri。最好删除它。

此外，您应该在构建位图时调整图像大小。执行此操作的代码已在此处发布了一百次。 Google for justDecodeBounds。

【参考方案1】：

我终于让它工作了，解决方案是使用这样的位图：

 Bitmap b = BitmapUtility.decodeSampledBitmapFromResource(image.getAbsolutePath(), 540, 360);

位图实用程序：

public class BitmapUtility 

public static Bitmap decodeSampledBitmapFromResource(String path, int reqWidth, int reqHeight) 

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(path,options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeFile(path, options);

private static int calculateInSampleSize(
        BitmapFactory.Options options, int reqWidth, int reqHeight) 
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) 

        final int halfHeight = height / 2;
        final int halfWidth = width / 2;

        // Calculate the largest inSampleSize value that is a power of 2 and keeps both
        // height and width larger than the requested height and width.
        while ((halfHeight / inSampleSize) > reqHeight
                && (halfWidth / inSampleSize) > reqWidth) 
            inSampleSize *= 2;
        
    

    return inSampleSize;