add android code

app/src/main/assets/index.html

@@ -21,14 +21,14 @@
         let pdfDoc = null;
 
         function createPage() {
-        const div = document.createElement('canvas');
-        document.body.appendChild(div);
-        return div;
+            const div = document.createElement('canvas');
+            document.body.appendChild(div);
+            return div;
         }
 
         function renderPage(num) {
             pdfDoc.getPage(num).then((page) => {
-            let scale = 1;
+            let scale = 2;
             let viewport = page.getViewport(scale);
             let canvas = createPage();
             let ctx = canvas.getContext('2d');

app/src/main/java/pdfjs/scott/idv/androidpdfjs/MainActivity.java

 package pdfjs.scott.idv.androidpdfjs;
 
+import android.annotation.SuppressLint;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.webkit.WebSettings;
+import android.webkit.WebView;
 
 public class MainActivity extends AppCompatActivity {
 
+    private WebView mWebView;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        initView();
+
+        String pdfUrl = "file:///android_asset/pdf-js-demo.pdf";
+        mWebView.loadUrl("file:///android_asset/index.html?" + pdfUrl);
+    }
+
+    @SuppressLint("SetJavaScriptEnabled")
+    private void initView() {
+        mWebView = findViewById(R.id.webView);
+
+        WebSettings webSettings = mWebView.getSettings();
+        webSettings.setJavaScriptEnabled(true);
+        webSettings.setAllowFileAccess(true);
+        webSettings.setAllowFileAccessFromFileURLs(true);
+        webSettings.setAllowUniversalAccessFromFileURLs(true);
+        webSettings.setSupportZoom(true);
+        webSettings.setLoadWithOverviewMode(true);
+        webSettings.setUseWideViewPort(true);
+        webSettings.setBuiltInZoomControls(true);
     }
 }

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

@@ -4,15 +4,13 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:orientation="vertical"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+
+    <WebView
+        android:id="@+id/webView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
 
 </android.support.constraint.ConstraintLayout>
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