使用外部图像作为可绘制资源

Question

So I have an image saved on the external SD-Card. Now, I want to use that image as a resource in my project. (I want to use the image located at the specific path instead of R.drawable.image).

It would be also great, if there was a way to kinda "add" the image to the resources (and not just use it), that the image gets something like a resourceID like the ones in R.drawable got.

But basically I just want to display an external image in an imageView.

Answer 1

First you will need read external storage permission

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

then,

String imagePath = Environment.getExternalStorageDirectory().getAbsolutePath() +"directoryName/imageName.png";
    Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
    ImageView imageView = (ImageView)findViewById(R.id.imageview);
    imageView.setImageBitmap(bitmap);

Answer 2

Use the following code.

File file = new File("put your bitmap address here");
Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());

Answer 3

You cannot add any files to the app package (apk file) in runtime. If you want the image in your drawable folder, you should add it before packaging.

String path = "path-to-image";
Bitmap bitmap = BitmapFactory.decodeFile(path);
Drawable drawable = new BitmapDrawable(bitmap); //if you want a drawable