將 Android 中的位圖另存為文件夾中外部存儲中的 JPEG

Question

我正在使用此代碼將位圖保存在外部存儲中，但如果該文件夾不存在，則不會創建該文件夾：

String path = Environment.getExternalStorageDirectory().toString();
        OutputStream fOutputStream = null;
        File file = new File(path + "/Captures/", "screen.jpg");
        try {
            fOutputStream = new FileOutputStream(file);

            capturedBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOutputStream);

            fOutputStream.flush();
            fOutputStream.close();

            MediaStore.Images.Media.insertImage(getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            Toast.makeText(this, "Save Failed", Toast.LENGTH_SHORT).show();
            return;
        } catch (IOException e) {
            e.printStackTrace();
            Toast.makeText(this, "Save Failed", Toast.LENGTH_SHORT).show();
            return;
        }

如果圖像不存在，如何將圖像保存在新目錄中，如果文件夾在設備中，如何保存默認值？

Answer 1

試試這個它會給你結果肯定：

String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/req_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-" + n + ".jpg";
File file = new File(myDir, fname);
Log.i(TAG, "" + file);
if (file.exists())
    file.delete();
try {
    FileOutputStream out = new FileOutputStream(file);
    bm.compress(Bitmap.CompressFormat.JPEG, 90, out);
    out.flush();
    out.close();
} catch (Exception e) {
    e.printStackTrace();
}

添加這個以在畫廊中顯示：

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory())));

查看此鏈接以獲得明確的答案：在畫廊中顯示文件夾圖像

Answer 2

請使用下面的代碼片段可能會有所幫助

String path = Environment.getExternalStorageDirectory().toString();
OutputStream fOutputStream = null;
File file = new File(path + "/Captures/", "screen.jpg");
if (!file.exists()) {
    file.mkdirs();
}

try {
    fOutputStream = new FileOutputStream(file);

    capturedBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOutputStream);

    fOutputStream.flush();
    fOutputStream.close();

    MediaStore.Images.Media.insertImage(getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName());
} catch (FileNotFoundException e) {
    e.printStackTrace();
    Toast.makeText(this, "Save Failed", Toast.LENGTH_SHORT).show();
    return;
} catch (IOException e) {
    e.printStackTrace();
    Toast.makeText(this, "Save Failed", Toast.LENGTH_SHORT).show();
    return;
}

Answer 3

使用以下內容：

File dir = new File(path + "/Captures/");
if(!dir.exists()) {
    dir.mkdirs();
}
File file = new File(path + "/Captures/", "screen.jpg");
 ......

Answer 4

遲到但可能對某人有幫助。 使用下面的代碼，由於 BufferOutPutStream，它將更快地將位圖保存在外部目錄中。

public boolean storeImage(Bitmap imageData, String filename) {
    // get path to external storage (SD card)

    File sdIconStorageDir = null;

    sdIconStorageDir = new File(Environment.getExternalStorageDirectory()
            .getAbsolutePath() + "/myAppDir/");
    // create storage directories, if they don't exist
    if (!sdIconStorageDir.exist()) {
        sdIconStorageDir.mkdirs();
    }
    try {
        String filePath = sdIconStorageDir.toString() + File.separator + filename;
        FileOutputStream fileOutputStream = new FileOutputStream(filePath);
        BufferedOutputStream bos = new BufferedOutputStream(fileOutputStream);
        //Toast.makeText(m_cont, "Image Saved at----" + filePath, Toast.LENGTH_LONG).show();
        // choose another format if PNG doesn't suit you
        imageData.compress(Bitmap.CompressFormat.PNG, 100, bos);
        bos.flush();
        bos.close();

    } catch (FileNotFoundException e) {
        Log.w("TAG", "Error saving image file: " + e.getMessage());
        return false;
    } catch (IOException e) {
        Log.w("TAG", "Error saving image file: " + e.getMessage());
        return false;
    }
    return true;
}

Answer 5

您應該查看 File 的文檔，您會找到 mkdir() 方法。 它與 unix 幾乎相同： https : //developer.android.com/reference/java/io/File.html#mkdir()

Answer 6

這就是我在 Koltin 的案例中所做的：

fun getImageUriFromBitmap(context: Context, bitmap: Bitmap?): Uri {
        var filePath = ""
        try {
            filePath = createAndGetFilePath(context)
            val fileOutputStream = FileOutputStream(filePath)
            val bos = BufferedOutputStream(fileOutputStream)
            bitmap?.compress(Bitmap.CompressFormat.PNG, 100, bos)
            bos.flush()
            bos.close()
        } catch (e: FileNotFoundException) {
            Log.w("TAG", "Error saving image file: " + e.message)
        } catch (e: IOException) {
            Log.w("TAG", "Error saving image file: " + e.message)
        }
        return Uri.parse(filePath)
    }

    private fun createAndGetFilePath(context: Context): String {
        val file = File(
            context.getExternalFilesDir(Environment.DIRECTORY_PICTURES), // you can change the path here
            BuildConfig.localImagesFolder // add it in build.gradle under android
        )
        try {
            if (!file.exists()) {
                file.mkdirs()
            }
        } catch (e: java.lang.Exception) {
            e.printStackTrace()
        }
        return file.absolutePath + "/" + System.currentTimeMillis() + ".jpg"
    }