BitmapFactory解码文件NotFoundException

Question

我有一个应用程序，您可以从设备上的图库或照片文件夹中选择图像。所选文件的路径存储在Intent中，以便在活动之间传递。我通过intent.getDataString((.访问路径

一旦我有了所有选定的图像路径，我就会将它们存储在ArrayList中，并将其传递给ImageAdapter，以在ListView中显示。

我收到一个FileNotFoundException，有人知道为什么吗？

提前感谢

马特。

import java.util.ArrayList;
import uk.co.mobilewebexpert.infowrapsynclibrary.ApplicationObj;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
public class QueuedImagesActivity extends Activity {
    private static final String TAG = QueuedImagesActivity.class.getSimpleName();
    private ImageAdapter adapter;
    private ListView imageList;
    ApplicationObj appObj;
    Intent[] photos;
    String path;
    private ArrayList<String> imagePaths= new ArrayList<String>(); // Edit your code here..
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.image_listview);
        appObj = (ApplicationObj) getApplication();
        boolean includeBeingProcessed = true;
        try {
             photos = appObj.getQueuedPhotos(includeBeingProcessed);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        for(int i = 0; i < photos.length; i++){
            path = photos[i].getDataString();
            imagePaths.add(path);
            Log.e(TAG, "path in QueuedImagesActivity = " + path);
        }


        imageList= (ListView) findViewById(R.id.listView1);
        adapter= new ImageAdapter(getBaseContext(), imagePaths);
        imageList.setAdapter(adapter);      
    }
}

import java.util.ArrayList;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
    private static final String TAG = ImageAdapter.class.getSimpleName();
    static class RowItemHolder{
        ImageView imageView;
    }
    private Context context;
    private ArrayList<String> imagePaths= new ArrayList<String>();
    public ImageAdapter(Context baseContext, ArrayList<String> imagePaths) {
    // TODO Auto-generated constructor stub
        this.context= baseContext;
        this.imagePaths= imagePaths;
    }
    @Override
    public int getCount() {
    // TODO Auto-generated method stub
        return imagePaths.size();
    }
    @Override
    public Object getItem(int position) {
    // TODO Auto-generated method stub
            return null;
    }
    @Override
    public long getItemId(int position) {
    // TODO Auto-generated method stub
            return 0;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View view;
    view= convertView;
    RowItemHolder holder = null;
    if(view== null){
            LayoutInflater in =(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = in.inflate(R.layout.image_view, parent, false);
            holder= new RowItemHolder();
            holder.imageView=(ImageView) view.findViewById(R.id.imageView1);
        view.setTag(holder);
    } else{
            holder = (RowItemHolder) view.getTag();
    }
    //Edit the code here according to you needs.. 
    //like creating option and converting to Bitmap, 
    //or you can do this job in the main activity.
    //holder.imageView.setImageResource(imagePaths.get(position));
    Log.e(TAG, "imagePaths.get(position) = " + imagePaths.get(position));

    holder.imageView.setImageBitmap(BitmapFactory.decodeFile(imagePaths.get(position)));
    return view;
}
}

07-02 07:51:33.941: E/QueuedImagesActivity(22700): path in QueuedImagesActivity = content://media/external/images/media/7496
07-02 07:51:33.951: E/ImageAdapter(22700): imagePaths.get(position) = content://media/external/images/media/7496
07-02 07:51:33.961: E/BitmapFactory(22700): Unable to decode stream: FileNotFoundException
07-02 07:51:33.971: E/ImageAdapter(22700): imagePaths.get(position) = content://media/external/images/media/7496
07-02 07:51:33.971: E/BitmapFactory(22700): Unable to decode stream: FileNotFoundException
07-02 07:51:33.981: E/ImageAdapter(22700): imagePaths.get(position) = content://media/external/images/media/7496
07-02 07:51:33.981: E/BitmapFactory(22700): Unable to decode stream: FileNotFoundException
07-02 07:51:33.991: E/ImageAdapter(22700): imagePaths.get(position) = content://media/external/images/media/7496
07-02 07:51:33.991: E/BitmapFactory(22700): Unable to decode stream: FileNotFoundException

Answer 1

您获得的路径不是图像的真实路径，而是一个Uri。如果你想设置它ImageView设置它像

imageView.setImageURI(Uri.parse(imagePaths.get(position)));

或

通过传递URI获得真实路径，并将其设置为ImageView

private String getRealPathFromURI(Uri contentURI) {
String result;
Cursor cursor = getContentResolver().query(contentURI, null, null, null, null);
if (cursor == null) { // Source is Dropbox or other similar local file path
    result = contentURI.getPath();
} else { 
    cursor.moveToFirst(); 
    int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); 
    result = cursor.getString(idx);
    cursor.close();
}
return result;
}

有关更多信息，请查看此处的Uri到路径转换

Answer 2

这是因为intent.getDataString()返回uri字符串。请改用intent.getData().getPath()。

Answer 3

试试这种方法，希望这能帮助你解决问题

  public String getAbsolutePath(Uri uri) {
        if(Build.VERSION.SDK_INT >= 19){
            String id = uri.getLastPathSegment().split(":")[1];
            final String[] imageColumns = {MediaStore.Images.Media.DATA };
            final String imageOrderBy = null;
            Uri tempUri = getUri();
            Cursor imageCursor = getContentResolver().query(tempUri, imageColumns,
                    MediaStore.Images.Media._ID + "="+id, null, imageOrderBy);
            if (imageCursor.moveToFirst()) {
                return imageCursor.getString(imageCursor.getColumnIndex(MediaStore.Images.Media.DATA));
            }else{
                return null;
            }
        }else{
            String[] projection = { MediaColumns.DATA };
            Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
            if (cursor != null) {
                int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
                cursor.moveToFirst();
                return cursor.getString(column_index);
            } else
                return null;
        }
    }

Answer 4

您的问题出现在appObj.getQueuedPhotos中-它没有返回文件名，而是返回URI，decodeFile需要一个路径。在这种情况下，您可以进行快速的字符串操作并从前面删除内容：/，但最好修复getQueuedPhotos函数

Answer 5

content://media/external/images/media/7496不是存储文件的实际位置，而是Uri，因此android无法在指定路径上找到文件。但是，您可以使用URI来获取文件的绝对路径，并在解码时使用该路径。

使用这种方法来获得绝对路径：

public String getRealPathFromURI(Context context, Uri contentUri) {
  Cursor cursor = null;
  try { 
    String[] proj = { MediaStore.Images.Media.DATA };
    cursor = context.getContentResolver().query(contentUri,  proj, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
  } finally {
    if (cursor != null) {
      cursor.close();
    }
  }
}

发件人：https://stackoverflow.com/a/3414749/1239966

Answer 6

检查输入流，您只传递了一个URI。

BitmapFactory.decodeFile(imagePaths.get(position));

因此，找不到文件，请获取图像的绝对路径并将其传递。