Android 使保存的图片在图库中显示

最新推荐文章于 2021-06-23 12:39:44 发布

转载最新推荐文章于 2021-06-23 12:39:44 发布 · 400 阅读

本文详细介绍了在Android应用中通过长按图片弹出菜单并实现保存图片的功能，包括创建对话框、获取图片位图、保存图片到SD卡、扫描指定路径的图片进入图库等步骤。

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已经可以看到一张大图前提下，长按弹出 “保存图片”。代码

@Override
public boolean onLongClick(View v) {
    switch (v.getId()) {
        case R.id.iv_image:

            AlertDialog.Builder builder = new AlertDialog.Builder(activity);
            builder.setItems(new String[]{"保存图片"}, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    iv_image.setDrawingCacheEnabled(true);
                    Bitmap imageBitmap = iv_image.getDrawingCache();
                    if (imageBitmap != null) {
                        new SaveImageTask().execute(imageBitmap);
                    }
                }
            });
            builder.show();
    }
    return true;
}

private class SaveImageTask extends AsyncTask<Bitmap, Void, String> {
    @Override
    protected String doInBackground(Bitmap... params) {
        String result = "保存失败";
        try {
            String sdcard = Environment.getExternalStorageDirectory().toString();
            File file = new File(sdcard + "/国字号");
            if (!file.exists()) {
                file.mkdirs();
            }
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
            String fileName = sdf.format(new Date()) + ".jpg";
            File imageFile = new File(file.getAbsolutePath(), fileName);
            FileOutputStream outStream = null;
            outStream = new FileOutputStream(imageFile);
            Bitmap image = params[0];
            image.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
            outStream.flush();
            outStream.close();
            result = getResources().getString(R.string.save_picture_success, file.getAbsolutePath());
            //关键的代码就这一句，仅仅扫描指定路径的图片将其放入图库。
            activity.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(imageFile)));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    @Override
    protected void onPostExecute(String result) {
        Toast.makeText(activity, result, Toast.LENGTH_SHORT).show();
        iv_image.setDrawingCacheEnabled(false);
    }
}

<string name="save_picture_success">图片成功保存至%s目录</string>

参考http://blog.youkuaiyun.com/jiayite/article/details/51434047