BitmapFactory decodeFile FileNotFoundException

Question

我有一个应用程序，你可以选择图片从画廊或照片文件夹上的设备。所选文件的路径存储在意图中，因此它们可以在活动之间传递。我通过intent.getDataString()访问路径。

一旦有了所有选定的图像路径，我就将它们存储在ArrayList中，并将其传递给ImageAdapter，以便在ListView中显示。

我得到了一个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

您正在获取的路径不是图像的真实路径，而是要设置它的Uri.If -- ImageView设置它

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

或

通过传递URI并将其设置为ImageView来获取实路径

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，请在这里查看Uri to path conversion

Answer 2

这是因为intent.getDataString()返回uri字符串。使用intent.getData().getPath()代替。

Answer 3

试着这样做，希望这能帮助您解决问题。

  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;
        }

    }