<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/hello"
    android:text="@string/hello_world" />

ImageView imageView = (ImageView) findViewById(R.id.image);
imageView.setImageResource(R.drawable.hello);

        AssetManager manager = getAssets();

        // read a Bitmap from Assets
        InputStream open = null;
        try {
            open = manager.open("logo.png");
            Bitmap bitmap = BitmapFactory.decodeStream(open);
            // Assign the bitmap to an ImageView in this layout
            ImageView view = (ImageView) findViewById(R.id.imageView1);
            view.setImageBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (open != null) {
                try {
                    open.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

Bitmap b = BitmapFactory.decodeResource(getResources(), R.drawable.ic_action_search); 

Bitmap originalBitmap = <initial setup>;

Bitmap resizedBitmap = 
   Bitmap.createScaledBitmap(originalBitmap, newWidth, newHeight, false);

# Convert Bitmap to Drawable
Drawable d = new BitmapDrawable(getResources(),bitmap);

 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:height="64dp"
     android:width="64dp"
     android:viewportHeight="600"
     android:viewportWidth="600" >
     <group
         android:name="rotationGroup"
         android:pivotX="300.0"
         android:pivotY="300.0"
         android:rotation="45.0" >
         <path
             android:name="v"
             android:fillColor="#000000"
             android:pathData="M300,70 l 0,-70 70,70 0,0 -70,70z" />
     </group>
 </vector>

<!-- Animation frames are phase*.png files inside the
 res/drawable/ folder -->
 <animation-list android:id="@+id/selected" android:oneshot="false">
    <item android:drawable="@drawable/phase1" android:duration="400" />
    <item android:drawable="@drawable/phase2" android:duration="400" />
    <item android:drawable="@drawable/phase3" android:duration="400" />
 </animation-list>

ImageView img = (ImageView)findViewById(R.id.yourid);
img.setBackgroundResource(R.drawable.your_animation_file);

 // Get the AnimationDrawable object.
 AnimationDrawable frameAnimation = (AnimationDrawable) img.getBackground();

 // Start the animation (looped playback by default).
 frameAnimation.start();

package com.vogella.android.drawables.custom;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;

public class MyRoundCornerDrawable extends Drawable {

    private Paint paint;

    public MyRoundCornerDrawable(Bitmap bitmap) {
        BitmapShader shader;
        shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        paint = new Paint();
        paint.setAntiAlias(true);
        paint.setShader(shader);
    }

    @Override
    public void draw(Canvas canvas) {
        int height = getBounds().height();
        int width = getBounds().width();
        RectF rect = new RectF(0.0f, 0.0f, width, height);
        canvas.drawRoundRect(rect, 30, 30, paint);
    }

    @Override
    public void setAlpha(int alpha) {
        paint.setAlpha(alpha);
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        paint.setColorFilter(cf);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/image"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:contentDescription="TODO" />

</RelativeLayout>

package com.vogella.android.drawables.custom;

import java.io.InputStream;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ImageView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ImageView button = (ImageView) findViewById(R.id.image);
        InputStream resource = getResources().openRawResource(R.raw.dog);
        Bitmap bitmap = BitmapFactory.decodeStream(resource);
        button.setBackground(new MyRoundCornerDrawable(bitmap));
    }

}