如何从 url Android Studio 下载我的位图到画廊

Question

我的项目中有位图，我想从 url 下载我的位图到画廊。我该怎么办？

我确实用它来创建二维码

private Bitmap stringToBitmap(String content){
        try {
            QRCodeWriter writer = new QRCodeWriter();
            BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, 512, 512);
            int width = bitMatrix.getWidth();
            int height = bitMatrix.getHeight();
            Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    bmp.setPixel(x, y, bitMatrix.get(x, y) ? Color.BLACK : Color.WHITE);
                }
            }
            return bmp;
        } catch (WriterException e) {
            e.printStackTrace();
            return null;
        }
    }
}

我想将位图下载到我的图库中

 @Override

    public void onClick(View view) {
        Intent i;
        switch (view.getId()) {
            case R.id.qrindir:
                Bitmap imageResult = stringToBitmap(texttt.getText().toString());
//I want download bitmap in there
                break;

        }
    }

我将它用于 stringtoBitmap

olustur.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {

                        Bitmap imageResult = stringToBitmap(texttt.getText().toString());
       }                });

            }

Answer 1

如果我没听错你的问题，你想将位图保存到你的内部存储器。

在这种情况下，您可以使用 Bitmap.compress() 方法，例如，

try {
   FileOutputStream outstream = new FileOutputStream(path-to-save);
   bitmap.compress(Bitmap.CompressFormat.PNG, 100, outstream);
   outstream.close();
} catch (IOException e) {
   ...
}

还要确保为了将文件写入内部（主要）存储，您需要请求 WRITE_EXTERNAL_STORAGE at runtime, this may not work for devices above Android 10 (API 29). In such case you can use SAF 创建文档。

Answer 2

试试这个：

private final void saveJpeg(@NonNull Bitmap bitmap, @NonNull String fileName) throws IOException {
    // create a file output stream that will connect to external media store
    OutputStream fos = null;

    ContentResolver cr = getApplicationContext().getContentResolver();
    ContentValues cv = new ContentValues();

    // set meta data for your file
    cv.put(MediaStore.MediaColumns.DISPLAY_NAME, fileName);
    cv.put(MediaStore.MediaColumns.MIME_TYPE, "image/jpg");
    cv.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_PICTURES);

    // get uri for new image file
    Uri imageUri = cr.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, cv);

    // connect file output stream
    fos = cr.openOutputStream(imageUri);

    // compress bitmap and write to output stream
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);

    // close file out stream
    fos.flush();
    fos.close();
}

这会将您的位图压缩为 jpg 并写入画廊

此外，记得在您的 AndroidManifest.xml

中获得许可

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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