Question

在我的应用中，我将webview的文本保存为图像文件并启动共享功能以允许用户共享文件，图像也保存在图片文件夹中。我可以确认它们确实通过文件浏览器出现在图片文件夹中，但Gallery没有更新。

我用来拍摄图像的代码是

   private void htmlCapture2() {
    if (!checksd()) {
        Log.e("sdcard", "failed sd card check");
        //we dont have permision so lets not continue
        return;
    }
    if (!checkFolder()) {
        Log.e("folder", "failed folder check");
        //we dont have a folder so lets not continue
        return;
    }
    WebView webView = (WebView) findViewById(R.id.webView);
    webView.setDrawingCacheEnabled(true);
    webView.buildDrawingCache();
    Bitmap bm = screenshot(webView);
    Intent share = new Intent(Intent.ACTION_SEND);
    share.setType("image/png");
    ContentValues values = new ContentValues();
    values.put(MediaStore.Images.Media.TITLE,"title");
    values.put(MediaStore.Images.Media.MIME_TYPE,"image/png");
    Uri uri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,values);
    OutputStream outstream;
    try {
        outstream = getContentResolver().openOutputStream(uri);
        bm.compress(Bitmap.CompressFormat.PNG,100,outstream);
        outstream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    share.putExtra(Intent.EXTRA_STREAM,uri);
    share.putExtra(MediaStore.EXTRA_VIDEO_QUALITY,1);
    startActivity(Intent.createChooser(share,"Share Image"));
}

public static Bitmap screenshot(WebView webView) {
    try {
        //float scale = webView.getScaleX();
        int height;
        height = webView.getHeight();

        Bitmap bitmap = Bitmap.createBitmap(webView.getWidth(), height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        canvas.drawColor(0xffffffff);
        webView.draw(canvas);
        return bitmap;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

我花了三天时间才能做到这一点，甚至更多地寻找最新问题的解决方案我知道我需要使用MediaScannerConnection，但它需要一个文件名，我没有，因为我没有真正创建一个文件。我已经看过扫描SD卡的解决方案，但这似乎是一个坏主意，当我试图摆脱绝望时，他们似乎无法使用最新的SDK

任何帮助非常感谢

Answer 1

您需要通知Android MediaStore已添加新图像，您可以通过以下方式执行此操作

public Uri addImageToMediaStore(ContentResolver mresolver, String imgType, File filepath) {
    ContentValues Cvalues = new ContentValues();
    Cvalues.put(MediaStore.Images.Media.TITLE, "player");
    Cvalues.put(MediaStore.Images.Media.DISPLAY_NAME, "player");
    Cvalues.put(MediaStore.Images.Media.DESCRIPTION, "");
    Cvalues.put(MediaStore.Images.Media.MIME_TYPE, "image/" + imgType);
    Cvalues.put(MediaStore.Images.Media.DATE_ADDED, System.currentTimeMillis());
    Cvalues.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis());
    Cvalues.put(MediaStore.Images.Media.DATA, filepath.toString());
    return mresolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, Cvalues);
}

希望这有帮助

Answer 2

根据CommonsWare的建议，我采用了文件保存方法（我知道它不是推荐的方法，但确实有工作的优点）

   private void htmlCapture2() {
    if (!checksd()) {
        Log.e("sdcard", "failed sd card check");
        //we dont have permision so lets not continue
        return;
    }
    if (!checkFolder()) {
        Log.e("folder", "failed folder check");
        //we dont have a folder so lets not continue
        return;
    }
    WebView webView = (WebView) findViewById(R.id.webView);
    webView.setDrawingCacheEnabled(true);
    webView.buildDrawingCache();
    Bitmap bm = screenshot(webView);
    String filename = "capture_" + z.getCurrentTimeStamp() + ".png";
    File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "", filename);

    Intent share = new Intent(Intent.ACTION_SEND);
    share.setType("image/png");
    //ContentValues values = new ContentValues();
    //values.put(MediaStore.Images.Media.TITLE,"title");
    //values.put(MediaStore.Images.Media.MIME_TYPE,"image/png");
    //Uri uri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,values);


    OutputStream outstream;
    try {
        file.createNewFile();
        FileOutputStream ostream = new FileOutputStream(file);
        bm.compress(Bitmap.CompressFormat.PNG, 100, ostream);
        Log.i("ExternalStorage","I think the path is : "+file.toString());
        ostream.close();
        Log.i("ExternalStorage","I think the path is : "+file.toString());
        MediaScannerConnection.scanFile(this,
                new String[] { file.toString() }, null,
                new MediaScannerConnection.OnScanCompletedListener() {
                    public void onScanCompleted(String path, Uri uri) {
                        Log.i("ExternalStorage", "Scanned " + path + ":");
                        Log.i("ExternalStorage", "-> uri=" + uri);
                    }
                });
        //outstream = getContentResolver().openOutputStream(uri);
        //bm.compress(Bitmap.CompressFormat.PNG,100,outstream);
        //outstream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    share.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
    //share.putExtra(Intent.EXTRA_STREAM,uri);
    share.putExtra(MediaStore.EXTRA_VIDEO_QUALITY,1);
    startActivity(Intent.createChooser(share,"Share Image"));
}

我当然要做一些整理，图片并没有出现在画廊中，但是如果你去画廊中下载专辑，那就是以前的改进。

如何获得图库（和相关的图像查看器）以确认是否存在新图像？

2 个答案: