android - 将多个图像保存到外部存储android

Question

我的 res/drawable 文件夹中有 50 多张图片。我想将这些图像保存到外部存储器，然后在 ImageView /图像切换器中一张一张地显示这些图像。我使用下面的代码将单个图像保存到外部存储。但我无法弄清楚如何将所有这些图像一起(一次)保存到外部存储器。

public void SaveImage(){
    if (!CheckExternalStorage()) {
        return;
    }

    Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.a01);
    try {
        File dir = new File(path);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        OutputStream fOut = null;
        File file = new File(path, "image1.png");
        file.createNewFile();
        fOut = new FileOutputStream(file);
        bmp.compress(Bitmap.CompressFormat.PNG, 100, fOut);
        fOut.flush();
        fOut.close();
        MediaStore.Images.Media.insertImage(this.getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName());
        Log.i(LOGTAG, "Image Written to Exterbal Storage");

    } catch (Exception e) {
        Log.e("saveToExternalStorage()", e.getMessage());
    }


}

Answer 1

使用来自:https://stackoverflow.com/a/3221787/794088 的答案进行一些修改以使用参数调用您的方法 SaveImage

...
R.drawable drawableResources = new R.drawable();
Class<R.drawable> c = R.drawable.class;
Field[] fields = c.getDeclaredFields();

for (int i = 0, max = fields.length; i < max; i++) {
    final int resourceId;
    try {
        resourceId = fields[i].getInt(drawableResources);
        // call save with param of resourceId
        SaveImage(resourceId);
    } catch (Exception e) {
        continue;
    }
}

...

public void SaveImage(int resId){
    if (!CheckExternalStorage()) {
        return;
    }

    Bitmap bmp = BitmapFactory.decodeResource(getResources(), resID);
    try {
        File dir = new File(path);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        OutputStream fOut = null;
        File file = new File(path, "image1.png");
        file.createNewFile();
        fOut = new FileOutputStream(file);
        bmp.compress(Bitmap.CompressFormat.PNG, 100, fOut);
        fOut.flush();
        fOut.close();
        MediaStore.Images.Media.insertImage(this.getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName());
        Log.i(LOGTAG, "Image Written to Exterbal Storage");

    } catch (Exception e) {
        Log.e("saveToExternalStorage()", e.getMessage());
    }


}