Getting Images from the Gallery

app/src/main/java/dragosholban/com/androidpuzzlegame/MainActivity.java

@@ -42,6 +42,8 @@ public class MainActivity extends AppCompatActivity {
     String mCurrentPhotoPath;
     private static final int REQUEST_PERMISSION_WRITE_EXTERNAL_STORAGE = 2;
     private static final int REQUEST_IMAGE_CAPTURE = 1;
+    static final int REQUEST_PERMISSION_READ_EXTERNAL_STORAGE = 3;
+    static final int REQUEST_IMAGE_GALLERY = 4;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -127,5 +129,22 @@ protected void onActivityResult(int requestCode, int resultCode, Intent data) {
             intent.putExtra("mCurrentPhotoPath", mCurrentPhotoPath);
             startActivity(intent);
         }
+        if (requestCode == REQUEST_IMAGE_GALLERY && resultCode == RESULT_OK) {
+            Uri uri = data.getData();
+
+            Intent intent = new Intent(this, PuzzleActivity.class);
+            intent.putExtra("mCurrentPhotoUri", uri.toString());
+            startActivity(intent);
+        }
+    }
+
+    public void onImageFromGalleryClick(View view) {
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
+            ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.READ_EXTERNAL_STORAGE}, REQUEST_PERMISSION_READ_EXTERNAL_STORAGE);
+        } else {
+            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
+            intent.setType("image/*");
+            startActivityForResult(intent, REQUEST_IMAGE_GALLERY);
+        }
     }
 }

app/src/main/java/dragosholban/com/androidpuzzlegame/PuzzleActivity.java

@@ -14,6 +14,7 @@
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.media.ExifInterface;
+import android.net.Uri;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.widget.ImageView;
@@ -31,6 +32,7 @@
 public class PuzzleActivity extends AppCompatActivity {
     ArrayList<PuzzlePiece> pieces;
     String mCurrentPhotoPath;
+    String mCurrentPhotoUri;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -43,6 +45,7 @@ protected void onCreate(Bundle savedInstanceState) {
         Intent intent = getIntent();
         final String assetName = intent.getStringExtra("assetName");
         mCurrentPhotoPath = intent.getStringExtra("mCurrentPhotoPath");
+        mCurrentPhotoUri = intent.getStringExtra("mCurrentPhotoUri");
 
         // run image related code after the view was laid out
         // to have all dimensions calculated
@@ -53,6 +56,8 @@ public void run() {
                     setPicFromAsset(assetName, imageView);
                 } else if (mCurrentPhotoPath != null) {
                     setPicFromPath(mCurrentPhotoPath, imageView);
+                } else if (mCurrentPhotoUri != null) {
+                    imageView.setImageURI(Uri.parse(mCurrentPhotoUri));
                 }
                 pieces = splitImage();
                 TouchListener touchListener = new TouchListener(PuzzleActivity.this);

app/src/main/res/drawable/ic_image_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M21,19V5c0,-1.1 -0.9,-2 -2,-2H5c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2zM8.5,13.5l2.5,3.01L14.5,12l4.5,6H5l3.5,-4.5z"/>
+</vector>

app/src/main/res/layout/activity_main.xml

@@ -38,4 +38,18 @@
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent" />
 
+    <android.support.design.widget.FloatingActionButton
+        android:id="@+id/galleryButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginRight="8dp"
+        android:clickable="true"
+        android:onClick="onImageFromGalleryClick"
+        android:src="@drawable/ic_image_black_24dp"
+        android:tint="@android:color/white"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/cameraButton" />
+
 </android.support.constraint.ConstraintLayout>