Reading image resources from different locations (drawable, asset, SDCard) in Android

Reading image resources from different locations (drawable, asset, SDCard) in Android

Method 1:

You have saved the image to the drawable directory and obtained the Drawable or Bitmap by using the image id. This method is most commonly used. (If you only know the image name, you can also obtain the image id through the image name)

(1) Obtain Drawable by image id

Drawable drawable = getResource (). getDrawable (R. drawable. xxx );

(2) Obtain Bitmap by image id

Resource res = gerResource ();

Bitmap bitmap = BitmapFactory. decodeResource (res, id );

(3) obtain the image id using the image name (two methods)

Int id = res. getIdentifier (name, defType, defPackage); // name: image name, defType: resource type (drawable, string ...), DefPackage: project package name

Drawable drawable = getResource (). getDrawable (id );

Method 2:

You have saved the image to the assest directory. You can use inputstream to obtain the image Drawabl.

Or Bitmap

AssetManager asm = getAssetMg ();

InputStream is = asm. open (name); // name: image name

(1) Obtain Drawable
Drawable da = Drawable. createFromStream (is, null );

(2) Obtain Bitmap
Bitmap bitmap = BitmapFactory. decodeStream (is );

Method 3: Save the image to sdcard.

/Image path
String imgFilePath = Environment. getExternalStorageDirectory (). toString ()
+ "/DCIM/device.png ";

(1) file input stream

FS = new FileInputStream (new File (imgFilePath); // File input stream

Bitmap bmp = BitmapFactory. decodeStream (FCM );

(2)

ImageView iv = (ImageView) findViewById (R. id. image );
Bitmap bit = BitmapFactory. decodeFile ("/sdcard/android.bmp ");
Iv. setImageBitmap (bit );

Iv. setImageDrawable (Drawable. createFromPath (new File (Environment. getExternalStorageDirectory (), "camera.jpg"). getAbsolutePath ()));