Android-如何将画布保存到内部存储器中的图像

Question

Hi I am making an Android app that allows a user to draw on screen. I have a button, when pressed I want the canvas to save as an image into the internal memory. I have tried the following codes but I keep getting FileNotFoundException open failed: EACCES (permission denied) :

        String path = Environment.getDataDirectory().getAbsolutePath();
        File file = new File(path+"image.png");

        Bitmap bitmap = Bitmap.createBitmap(100,200,Bitmap.Config.ARGB_8888);

        FileOutputStream ostream;

        try {
            ostream = new FileOutputStream(file);
            bitmap.compress(CompressFormat.PNG, 100, ostream);
            ostream.flush();
            ostream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

Answer 1

尝试使用context.openFileInput（String fileName）创建fileoutputstream。

bitmap.compress(CompressFormat.PNG, 100, context.openFileInput(fileName);

Answer 2

in this part try to change to this:

File file = new File(path + File.separator + "image.png");

and make sure you have these in your manifest:

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