java– 截图Android中的黑色

概述我一直在研究如何在android中以编程方式截取屏幕截图,但是当它截图时,我会获得一个工具栏和黑屏,而不是屏幕上实际显示的内容.我还尝试在为谷歌地图创建的自定义InfoWindow布局中截取特定的TextView.但是这会在下面的第二行创建一个空指针异常.TextViewv1=(TextView)findView

我一直在研究如何在android中以编程方式截取屏幕截图,但是当它截图时,我会获得一个工具栏和黑屏,而不是屏幕上实际显示的内容.

我还尝试在为谷歌地图创建的自定义InfoWindow布局中截取特定的TextVIEw.但是这会在下面的第二行创建一个空指针异常.

TextVIEw v1 = (TextVIEw)findVIEwByID(R.ID.tv_code);v1.setDrawingCacheEnabled(true);

无论如何要么实际屏幕截图屏幕上没有安装androID截图库或截取自定义InfoWindow布局中的TextVIEw

这是我的截图方法：

/** * Method to take a screenshot programmatically */private voID takeScreenshot(){    try {        //TextVIEw I Could screenshot instead of the whole screen:        //TextVIEw v1 = (TextVIEw)findVIEwByID(R.ID.tv_code);        VIEw v1 = getwindow().getDecorVIEw().getRootVIEw();        v1.setDrawingCacheEnabled(true);        Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());        v1.setDrawingCacheEnabled(false);        ByteArrayOutputStream bytes = new ByteArrayOutputStream();        bitmap.compress(Bitmap.CompressFormat.JPEG, 40, bytes);        file f = new file(Environment.getExternalStorageDirectory()                + file.separator + "test.jpg");        fileOutputStream fo = new fileOutputStream(f);        fo.write(bytes.toByteArray());        fo.flush();        fo.close();        MediaStore.Images.Media.insertimage(getContentResolver(), f.getabsolutePath(), f.getname(), f.getname());        Log.d("deBUG", "Screenshot saved to gallery");        Toast.makeText(HuntActivity.this,"Code Saved!",Toast.LENGTH_LONG).show();    } catch (fileNotFoundException e) {        e.printstacktrace();    } catch (IOException e) {        e.printstacktrace();    }}

编辑：我已将方法更改为源提供的方法

How can i take/merge screen shot of Google map v2 and layout of xml both programmatically?

然而,它没有截图任何东西.

public voID captureMapScreen() {    GoogleMap.SnapshotReadyCallback callback = new GoogleMap.SnapshotReadyCallback() {        @OverrIDe        public voID onSnapshotReady(Bitmap snapshot) {            try {                VIEw mVIEw = getwindow().getDecorVIEw().getRootVIEw();                mVIEw.setDrawingCacheEnabled(true);                Bitmap backBitmap = mVIEw.getDrawingCache();                Bitmap bmOverlay = Bitmap.createBitmap(                        backBitmap.getWIDth(), backBitmap.getHeight(),                        backBitmap.getConfig());                Canvas canvas = new Canvas(bmOverlay);                canvas.drawBitmap(backBitmap, 0, 0, null);                canvas.drawBitmap(snapshot, new Matrix(), null);                fileOutputStream out = new fileOutputStream(                        Environment.getExternalStorageDirectory()                                + "/"                                + System.currentTimeMillis() + ".jpg");                bmOverlay.compress(Bitmap.CompressFormat.JPEG, 90, out);            } catch (Exception e) {                e.printstacktrace();            }        }    };    mMap.snapshot(callback);}

解决方法:

我已经弄清楚了！

/** * Method to take a screenshot programmatically */private voID takeScreenshot(){    GoogleMap.SnapshotReadyCallback callback = new GoogleMap.SnapshotReadyCallback() {        @OverrIDe        public voID onSnapshotReady(Bitmap bitmap) {            Bitmap b = bitmap;            String timeStamp = new SimpleDateFormat(                    "yyyyMMdd_HHmmss", Locale.getDefault())                    .format(new java.util.Date());            String filepath = timeStamp + ".jpg";            try{                OutputStream fout = null;                fout = openfileOutput(filepath,MODE_WORLD_READABLE);                bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fout);                fout.flush();                fout.close();            } catch (fileNotFoundException e) {                e.printstacktrace();            } catch (IOException e) {                e.printstacktrace();            }            saveImage(filepath);        }    };    mMap.snapshot(callback);}/** * Method to save the screenshot image * @param filePath  the file path */public voID saveImage(String filePath){    file file = this.getfileStreamPath(filePath);    if(!filePath.equals(""))    {        final ContentValues values = new ContentValues(2);        values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");        values.put(MediaStore.Images.Media.DATA, file.getabsolutePath());        final Uri contentUrifile = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);        Toast.makeText(HuntActivity.this,"Code Saved to files!",Toast.LENGTH_LONG).show();    }    else    {        System.out.println("ERROR");    }}

我已经调整了此链接中的代码,因此它不会共享,而只是保存图像.

Capture screen shot of GoogleMap Android API V2

感谢大家的帮助

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