从sd卡显示图像（Android 2.3 vs 4.0.4）

我正在使用以下代码下载图像：

// Download AVATAR
                    try {
                        File avatar = new File(Environment.getExternalStorageDirectory() + "/Android/data/carl.fri.fer.omegan/avatar.jpg");
                        prefs.edit().putString("loginUser", json.name).commit();
                        prefs.edit().putInt("loginMatter", json.darkmatter).commit();

                        if (!avatar.exists()) {
                            Log.i("AVATAR", "Downloading user avatar...");
                            URL url = new URL("Valid URL");

                            URLConnection ucon = url.openConnection();
                            InputStream is = ucon.getInputStream();
                            BufferedInputStream bis = new BufferedInputStream(is);
                            ByteArrayBuffer baf = new ByteArrayBuffer(50);
                            int current = 0;
                            while ((current = bis.read()) != -1) {
                                    baf.append((byte) current);
                            }

                            FileOutputStream fos = new FileOutputStream(avatar);
                            fos.write(baf.toByteArray());
                            fos.close();
                        }
                        else Log.i("AVATAR", "The user avatar already exists!");
                } catch (IOException e) { System.out.println("Error downloading avatar: " + e); }

File usrAvatar = new  File(Environment.getExternalStorageDirectory() + "/Android/data/carl.fri.fer.omegan/avatar.jpg");
            if(usrAvatar.exists()) {

                Bitmap avatarBmp = BitmapFactory.decodeFile(usrAvatar.getAbsolutePath());
                userAvatar.setImageBitmap(avatarBmp);
            }

然后我尝试使用以下代码显示此图像：

// Download AVATAR
                    try {
                        File avatar = new File(Environment.getExternalStorageDirectory() + "/Android/data/carl.fri.fer.omegan/avatar.jpg");
                        prefs.edit().putString("loginUser", json.name).commit();
                        prefs.edit().putInt("loginMatter", json.darkmatter).commit();

                        if (!avatar.exists()) {
                            Log.i("AVATAR", "Downloading user avatar...");
                            URL url = new URL("Valid URL");

                            URLConnection ucon = url.openConnection();
                            InputStream is = ucon.getInputStream();
                            BufferedInputStream bis = new BufferedInputStream(is);
                            ByteArrayBuffer baf = new ByteArrayBuffer(50);
                            int current = 0;
                            while ((current = bis.read()) != -1) {
                                    baf.append((byte) current);
                            }

                            FileOutputStream fos = new FileOutputStream(avatar);
                            fos.write(baf.toByteArray());
                            fos.close();
                        }
                        else Log.i("AVATAR", "The user avatar already exists!");
                } catch (IOException e) { System.out.println("Error downloading avatar: " + e); }

File usrAvatar = new  File(Environment.getExternalStorageDirectory() + "/Android/data/carl.fri.fer.omegan/avatar.jpg");
            if(usrAvatar.exists()) {

                Bitmap avatarBmp = BitmapFactory.decodeFile(usrAvatar.getAbsolutePath());
                userAvatar.setImageBitmap(avatarBmp);
            }

问题出现在这里：

userAvatar.setImageBitmap(avatarBmp);

Android 4.0.4：错误类型：NullPointerException

Android 2.3.5：错误类型：ImageView未显示图像，但未显示任何错误

1.

ImageView

userAvatar是正确的，因为我可以显示可绘制文件夹中的图像

2-我要显示的图像已成功下载，因为使用文件管理器，我可以在指定的文件夹和文件名中找到它

3-图像没有损坏，因为我可以使用任何图像查看器打开它

那么，问题出在哪里？太疯狂了

任何帮助都将不胜感激

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提前谢谢你

请尝试以下代码：

        ImageView bmImage;
      FileInputStream instream = new FileInputStream("/sdcard/Pictures/Image.png"); 
            BufferedInputStream bif = new BufferedInputStream(instream); 
            byteImage1 = new byte[bif.available()]; 
            bif.read(byteImage1); 
            textView.append("\r\n" + byteImage1+"\r\n"); 
                        bmImage.setImageBitmap(BitmapFactory.decodeByteArray(byteImage1, 0, byteImage1.length));
            textView.append("\r\n" + byteImage2+"\r\n"); 

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17179是该图像的长度，现在我已经编辑了答案检查。它仍然显示NullPointerException和

textView

trhows[B@4178be30...somewhere你做错了，它对我来说工作得很好…离开textview…ImageView将显示SD卡文件中的图像，就像我提到的那样…bmImage.setImageBitmap（BitmapFactory.decodeByteArray（byteImage1，0，byteImage1.length））；这将在屏幕上显示图像所有我用来下载、存储和显示图像的代码都在我的问题中。我不理解它…我返回了de image，一切正常。