android - How to save an image to gallery

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="#e0f5d4"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Save Image To Gallery"         />     <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_saved"         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_saved"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_below="@id/iv_saved"         android:layout_alignLeft="@id/iv_saved"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.app.ActionBar; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.net.Uri; 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.drawable.Drawable; import android.graphics.drawable.BitmapDrawable; import android.widget.TextView; import android.provider.MediaStore;   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         akibat RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         akibat Button btn = (Button) findViewById(R.id.btn);         akibat ImageView iv_source = (ImageView) findViewById(R.id.iv_source);         akibat ImageView iv_saved = (ImageView) findViewById(R.id.iv_saved);         akibat TextView tv_saved = (TextView) findViewById(R.id.tv_saved);          akibat ActionBar ab = getActionBar();         ab.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#FFB4C7AA")));          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();                  /*                     public static akibat String insertImage (ContentResolver cr, Bitmap source,                     String title, String description)                          Insert an image and create a thumbnail for it.                      Parameters                         cr : The content resolver to use                         source : The stream to use for the image                         title : The name of the image                         description : The description of the image                      Returns                         The URL to the newly created image, or null if the image                         failed to be stored for any reason.                 */                  // Save image to gallery                 String savedImageURL = MediaStore.Images.Media.insertImage(                         getContentResolver(),                         bitmap,                         "Bird",                         "Image of bird"                 );                  // Parse the gallery image url to uri                 Uri savedImageURI = Uri.parse(savedImageURL);                  // Display the saved image to ImageView                 iv_saved.setImageURI(savedImageURI);                  // Display saved image url to TextView                 tv_saved.setText("Image saved to gallery.\n" + savedImageURL);            }         });     } }
AndroidManifest.xml (permission) 
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

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