21

我正在使用此代码将位图保存在外部存储中，但如果该文件夹不存在，则不会创建该文件夹：

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;
        }

如果不存在，如何将图像保存在新目录中，如果设备中存在文件夹，如何保存默认值？

4

6 回答 6

41

试试这个，它会给你肯定的结果：

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();
}

添加这个以在画廊中显示：

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

查看此链接以获得明确的答案： 在画廊中显示文件夹图像

于 2012-12-27T10:49:49.227 回答
11

请使用下面的代码片段可能会有所帮助

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;
}
于 2012-12-27T10:47:24.990 回答
1

使用以下内容：

File dir = new File(path + "/Captures/");
if(!dir.exists()) {
    dir.mkdirs();
}
File file = new File(path + "/Captures/", "screen.jpg");
 ......
于 2012-12-27T10:45:14.487 回答
1

迟到但可能对某人有帮助。使用下面的代码，由于 BufferOutPutStream，它将更快地将位图保存在外部目录中。

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;
}
于 2018-01-08T11:06:32.007 回答
0

你应该看一下 File 的文档，你会发现方法 mkdir()。它与 unix 几乎相同： https://developer.android.com/reference/java/io/File.html#mkdir()

于 2012-12-27T10:45:18.347 回答
0

这就是我在 Koltin 案例中的做法：

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"
    }
于 2021-05-03T13:52:22.873 回答