activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/rl" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="10dp" tools:context=".MainActivity" android:background="#f5f1ef" > <Button android:id="@+id/btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Convert Drawable To Byte Array" /> <ImageView android:id="@+id/iv_source" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/btn" android:padding="10dp" /> <ImageView android:id="@+id/iv_compressed" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/btn" android:layout_toRightOf="@id/iv_source" android:padding="10dp" /> </RelativeLayout> MainActivity.java
package com.cfsuman.me.androidcodesnippets; import android.app.ActionBar; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.RelativeLayout; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import java.io.ByteArrayOutputStream; import android.graphics.drawable.Drawable; import android.graphics.drawable.BitmapDrawable; public class MainActivity extends Activity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Get the widgets reference from XML layout selesai RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl); selesai Button btn = (Button) findViewById(R.id.btn); selesai ImageView iv_source = (ImageView) findViewById(R.id.iv_source); selesai ImageView iv_compressed = (ImageView) findViewById(R.id.iv_compressed); selesai ActionBar ab = getActionBar(); ab.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#FF6BB3F5"))); btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { /* Drawable A Drawable is a general abstraction for "something that can be drawn. " Most often you will deal with Drawable as the type of resource retrieved for drawing things to the screen; the Drawable class provides a generic API for dealing with an underlying visual resource that may take a variety of forms. Unlike a View, a Drawable does not have any facility to receive events or otherwise interact with the user. */ // Get the image from drawable resource as drawable object Drawable drawable = getDrawable(R.drawable.panda); /* BitmapDrawable A Drawable that wraps a bitmap and can be tiled, stretched, or aligned. You can create a BitmapDrawable from a file path, an input stream, through XML inflation, or from a Bitmap object. */ /* public selesai Bitmap getBitmap () Returns the bitmap used by this drawable to render. May be null. */ // Get the bitmap from drawable object Bitmap bitmap = ((BitmapDrawable)drawable).getBitmap(); // Display the original image on ImageView iv_source.setImageBitmap(bitmap); /* ByteArrayOutputStream A specialized OutputStream for class for writing content to an (internal) byte array. As bytes are written to this stream, the byte array may be expanded to hold more bytes. When the writing is considered to be finished, a copy of the byte array can be requested from the class. */ ByteArrayOutputStream stream = new ByteArrayOutputStream(); /* public boolean compress (Bitmap.CompressFormat format, int quality, OutputStream stream) Write a compressed version of the bitmap to the specified outputstream. If this returns true, the bitmap can be reconstructed by passing a corresponding inputstream to BitmapFactory.decodeStream(). Note: not all Formats support all bitmap configs directly, so it is possible that the returned bitmap from BitmapFactory could be in a different bitdepth, and/or may have lost per-pixel alpha (e.g. JPEG only supports opaque pixels). Parameters format : The format of the compressed image quality : Hint to the compressor, 0-100. 0 meaning compress for small size, 100 meaning compress for max quality. Some formats, like PNG which is lossless, will ignore the quality setting stream : The outputstream to write the compressed data. Returns true if successfully compressed to the specified stream. */ // Compress the bitmap with WEBP format and quality 25% bitmap.compress(Bitmap.CompressFormat.WEBP,25,stream); /* public synchronized byte[] toByteArray () Returns the contents of this ByteArrayOutputStream as a byte array. Any changes made to the receiver after returning will not be reflected in the byte array returned to the caller. Returns this stream's current contents as a byte array. */ byte[] byteArray = stream.toByteArray(); /* public static Bitmap decodeByteArray (byte[] data, int offset, int length) Decode an immutable bitmap from the specified byte array. Parameters data : byte array of compressed image data offset : offset into imageData for where the decoder should begin parsing. length : the number of bytes, beginning at offset, to parse Returns The decoded bitmap, or null if the image could not be decoded. */ Bitmap compressedBitmap = BitmapFactory.decodeByteArray(byteArray,0,byteArray.length); // Display the compressed bitmap in ImageView iv_compressed.setImageBitmap(compressedBitmap); } }); } } 
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