modified the code to include zoom

Author: justdvnsh

.idea/gradle.xml

@@ -36,4 +36,7 @@ dependencies {
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+
+    implementation 'com.github.bumptech.glide:glide:4.12.0'
+    annotationProcessor 'com.github.bumptech.glide:compiler:4.12.0'
 }

.idea/jarRepositories.xml

@@ -2,14 +2,16 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="divyansh.tech.twodscrollablezoomable">
 
+    <uses-permission android:name="android.permission.INTERNET" />
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.TwoDScrollableZoomable">
-        <activity android:name=".MainActivity">
+        <activity android:name=".MainActivity" android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/build.gradle

@@ -0,0 +1,68 @@
+package divyansh.tech.twodscrollablezoomable;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import android.view.ScaleGestureDetector;
+import android.view.animation.ScaleAnimation;
+import android.widget.ScrollView;
+
+public class CustomZoomScrollView extends ScrollView {
+
+
+    // step 1: add some instance
+    private float mScale = 1f;
+    private ScaleGestureDetector mScaleDetector;
+    GestureDetector gestureDetector;
+
+
+    public CustomZoomScrollView(Context context) {
+        super(context);
+    }
+
+    public CustomZoomScrollView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        //step 2: create instance from GestureDetector(this step should be place into onCreate())
+        gestureDetector = new GestureDetector(getContext(), new GestureListener());
+
+        mScaleDetector = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.SimpleOnScaleGestureListener() {
+            @Override
+            public boolean onScale(ScaleGestureDetector detector) {
+                float scale = 1 - detector.getScaleFactor();
+
+                float prevScale = mScale;
+                mScale += scale;
+
+                if (mScale < 0.1f) // Minimum scale condition:
+                    mScale = 0.1f;
+
+                if (mScale > 10f) // Maximum scale condition:
+                    mScale = 10f;
+                ScaleAnimation scaleAnimation = new ScaleAnimation(1f / prevScale, 1f / mScale, 1f / prevScale, 1f / mScale, detector.getFocusX(), detector.getFocusY());
+                scaleAnimation.setDuration(0);
+                scaleAnimation.setFillAfter(true);
+                getRootView().startAnimation(scaleAnimation);
+                return true;
+            }
+        });
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+    }
+
+    private class GestureListener extends GestureDetector.SimpleOnGestureListener {
+        @Override
+        public boolean onDown(MotionEvent e) {
+            return true;
+        }
+        // event when double tap occurs
+        @Override
+        public boolean onDoubleTap(MotionEvent e) {
+            // double tap fired.
+            return true;
+        }
+    }
+}

app/src/main/AndroidManifest.xml

@@ -1,14 +1,21 @@
 package divyansh.tech.twodscrollablezoomable;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.AppCompatImageView;
 
 import android.os.Bundle;
 
+import com.bumptech.glide.Glide;
+
 public class MainActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        AppCompatImageView iv = findViewById(R.id.image);
+        TwoDScrollableZoomableView view = findViewById(R.id.scrollable);
+        Glide.with(this).load("https://wallpaperaccess.com/full/391249.jpg").into(iv);
     }
 }