Question

嘿我想在外部存储器中保存图像。我有两个版本，但两个都没有用。目标是用户单击按钮并保存图像，然后用户也可以在库中看到它。所以这是第一版：

            String path = Environment.getExternalStorageDirectory().getPath();
            File outputDir= new File(path);
            outputDir.mkdirs();
            File newFile = new File(path+"/"+"test.png");
            FileOutputStream out = null;
            try {
                out = new FileOutputStream(newFile);
                mutableBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

这是版本2：

            String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + File.separator + "MyApplication";
            File outputDir= new File(path);
            outputDir.mkdirs();
            File newFile = new File(path+"/"+"test.png");
            FileOutputStream out = null;
            try {
                out = new FileOutputStream(newFile);
                mutableBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

感谢您的帮助

Answer 1

试试这个

 AsyncTask fileTask = new AsyncTask() {
        @Override
        protected Object doInBackground(Object[] objects) {
File directory = new File(Environment.getExternalStorageDirectory() + File.separator + "MyApplication");
if (!directory.exists()) {
                    directory.mkdirs();
                }
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String name = " "+n+".jpg";
File pictureFile = new File(directory, name);
pictureFile.createNewFile();
try {
FileOutputStream out = new FileOutputStream(pictureFile);
       finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
       out.close();
} catch (Exception e) {
       e.printStackTrace();
}
return null;
        }
    };
    fileTask.execute();

如果您的应用可以使用所有文件处理权限，这应该可以正常工作。

另请注意，您绝不应该在主线程中执行文件操作，因此如果您还没有使用AsyncTask，则始终使用AsyncTask。

Answer 2

较晚但可能会有所帮助

private void saveimage(Bitmap img) {


                try {
                    String imageName = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss").format(new Date());
                    boolean imageSaved = false;
                    if (!(img == null || img.isRecycled())) {
                        ContentResolver contentResolver = getContentResolver();
                        File file = new File(getStoragePath() + "img path/");
                        if (!file.exists()) {
                            file.mkdirs();
                        }
                        File imageFile = new File(file, String.format("%s.png", new Object[]{imageName}));
                        try {
                            FileOutputStream out = new FileOutputStream(imageFile);
                            imageSaved = img.compress(CompressFormat.PNG, 100, out);
                            if (out != null) {
                                out.flush();
                                out.close();
                            }
                        } catch (Exception e) {
                            Log.e(TAG, "Unable to write the image to gallery", e);
                        }
                        ContentValues values = new ContentValues(8);
                        values.put(SettingsJsonConstants.PROMPT_TITLE_KEY, imageName);
                        values.put("_display_name", camera.name);
                        String location = "";
                        if (camera.country != null && camera.country.length() > 0) {
                            location = camera.country;
                        }
                        if (camera.city != null && camera.city.length() > 0) {
                            location = location + ", " + camera.city;
                        }
                        values.put("description", location);
                        values.put("mime_type", "image/png");
                        values.put("description", "");
                        long millis = System.currentTimeMillis();
                        values.put("date_added", Long.valueOf(millis / 1000));
                        values.put("datetaken", Long.valueOf(millis));
                        values.put("_data", imageFile.getAbsolutePath());
                        contentResolver.insert(Media.EXTERNAL_CONTENT_URI, values);
                        MediaScannerConnection.scanFile(getApplicationContext(), new String[]{imageFile.getPath()}, new String[]{"image/png"}, new OnScanCompletedListener() {
                            public void onScanCompleted(String path, Uri uri) {
                            }
                        });
                    }
                    if (imageSaved) {

                    }
                } catch (Exception e2) {
                    Log.e(TAG, "saveSnapshot", e2);
                }




    }

将图像保存在外部存储上

2 个答案: