android - How to compress a bitmap

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="Compress Bitmap"         />     <ImageView         android:id="@+id/iv_source"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_below="@id/btn"         android:padding="5dp"         android:src="@drawable/bird"         />     <TextView         android:id="@+id/tv_source"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_below="@id/iv_source"         android:text="Original Image"         />     <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="5dp"         />     <TextView         android:id="@+id/tv_compressed"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_below="@id/iv_source"         android:layout_alignLeft="@id/iv_compressed"         /> </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; import android.widget.TextView;   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 TextView tv_compressed = (TextView) findViewById(R.id.tv_compressed);          selesai ActionBar ab = getActionBar();         ab.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#FFA0B94E")));          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Get the image from drawable resource as drawable object                 Drawable drawable = getDrawable(R.drawable.bird);                 // Get the bitmap from drawable object                 Bitmap bitmap = ((BitmapDrawable)drawable).getBitmap();                  // Display the original image on ImageView                 iv_source.setImageBitmap(bitmap);                  // Initialize a new ByteArrayStream                 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.                 */                  /*                     Bitmap.CompressFormat                         Specifies the known formats a bitmap can be compressed into.                              Bitmap.CompressFormat  JPEG                             Bitmap.CompressFormat  PNG                             Bitmap.CompressFormat  WEBP                 */                 // Compress the bitmap with JPEG format and quality 50%                 bitmap.compress(Bitmap.CompressFormat.JPEG,50,stream);                  byte[] byteArray = stream.toByteArray();                 Bitmap compressedBitmap = BitmapFactory.decodeByteArray(byteArray,0,byteArray.length);                  // Display the compressed bitmap in ImageView                 iv_compressed.setImageBitmap(compressedBitmap);                 tv_compressed.setText("Compressed Image / JPEG 50% Quality.");             }         });     } }

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