Fix issue #28

Author: nekocode

app/src/main/java/cn/nekocode/camerafilter/MainActivity.java

@@ -28,6 +28,7 @@
 import android.view.MotionEvent;
 import android.view.TextureView;
 import android.view.View;
+import android.widget.FrameLayout;
 import android.widget.Toast;
 
 import java.io.File;
@@ -43,14 +44,15 @@
  */
 public class MainActivity extends AppCompatActivity {
     private static final int REQUEST_CAMERA_PERMISSION = 101;
+    private FrameLayout container;
     private CameraRenderer renderer;
     private TextureView textureView;
     private int filterId = R.id.filter0;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.main);
+        setContentView(container = new FrameLayout(this));
         setTitle("Original");
 
         if (ContextCompat.checkSelfPermission(this,
@@ -84,8 +86,8 @@ public void onRequestPermissionsResult(int requestCode, String permissions[], in
 
     void setupCameraPreviewView() {
         renderer = new CameraRenderer(this);
-        textureView = (TextureView) findViewById(R.id.textureView);
-        assert textureView != null;
+        textureView = new TextureView(this);
+        container.addView(textureView);
         textureView.setSurfaceTextureListener(renderer);
 
         // Show original frame when touch the view