Integrate QrCode Camera with WifiDppQrCodeScannerFragment

Bug: 118797380
Test: RunSettingsRoboTests
Change-Id: I328bebbbcf44136df2c18ca1929a5da377a0cf6b

src/com/android/settings/wifi/dpp/WifiDppQrCodeScannerFragment.java

@@ -16,37 +16,120 @@
 
 package com.android.settings.wifi.dpp;
 
+import android.annotation.Nullable;
 import android.app.Activity;
 import android.content.Intent;
+import android.graphics.Rect;
 import android.os.Bundle;
+import android.text.TextUtils;
+import android.util.Size;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
 
 import com.android.settings.R;
+import com.android.settings.wifi.qrcode.QrCamera;
+import com.android.settings.wifi.qrcode.QrDecorateView;
+
+public class WifiDppQrCodeScannerFragment extends WifiDppQrCodeBaseFragment implements
+        SurfaceHolder.Callback,
+        QrCamera.ScannerCallback {
+    private QrCamera mCamera;
+    private SurfaceView mSurfaceView;
+    private QrDecorateView mDecorateView;
 
-public class WifiDppQrCodeScannerFragment extends WifiDppQrCodeBaseFragment {
     @Override
     protected int getLayout() {
         return R.layout.wifi_dpp_qrcode_scanner_fragment;
     }
 
     @Override
-    public void onActivityCreated (Bundle savedInstanceState) {
-        super.onActivityCreated (savedInstanceState);
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
 
         setTitle(getString(R.string.wifi_dpp_add_device_to_network));
 
-        String ssid = "";
-        Intent intent = getActivity().getIntent();
-        if (intent != null)
+        String ssid = null;
+        final Intent intent = getActivity().getIntent();
+        if (intent != null) {
             ssid = intent.getStringExtra(WifiDppConfiguratorActivity.EXTRA_SSID);
-        String description = getString(R.string.wifi_dpp_center_qr_code, ssid);
-        setDescription(description);
+        }
+        if (TextUtils.isEmpty(ssid)) {
+            throw new IllegalArgumentException("Invalid SSID");
+        }
+        setDescription(getString(R.string.wifi_dpp_center_qr_code, ssid));
 
         hideRightButton();
 
         setLeftButtonText(getString(android.R.string.cancel));
 
         setLeftButtonOnClickListener((view) -> {
-                getActivity().setResult(Activity.RESULT_CANCELED);
-                getActivity().finish();});
+            getActivity().setResult(Activity.RESULT_CANCELED);
+            getActivity().finish();
+        });
+    }
+
+    @Override
+    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+
+        mSurfaceView = (SurfaceView) view.findViewById(R.id.preview_view);
+        final SurfaceHolder surfaceHolder = mSurfaceView.getHolder();
+        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
+        surfaceHolder.addCallback(this);
+
+        mDecorateView = (QrDecorateView) view.findViewById(R.id.decorate_view);
+    }
+
+    @Override
+    public void surfaceCreated(final SurfaceHolder holder) {
+        initCamera(holder);
+    }
+
+    @Override
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        destroyCamera();
+    }
+
+    @Override
+    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
+        // Do nothing
+    }
+
+    @Override
+    public Size getViewSize() {
+        return new Size(mSurfaceView.getWidth(), mSurfaceView.getHeight());
+    }
+
+    @Override
+    public Rect getFramePosition(Size previewSize, int cameraOrientation) {
+        return new Rect(0, 0, previewSize.getHeight(), previewSize.getHeight());
+    }
+
+    @Override
+    public void handleSuccessfulResult(String qrCode) {
+        destroyCamera();
+        mDecorateView.setFocused(true);
+        // TODO(b/120243131): Add a network by Wi-Fi Network config shared via QR code.
+    }
+
+    @Override
+    public void handleCameraFailure() {
+        destroyCamera();
+    }
+
+    private void initCamera(SurfaceHolder holder) {
+        // Check if the camera has already created.
+        if (mCamera == null) {
+            mCamera = new QrCamera(getContext(), this);
+            mCamera.start(holder);
+        }
+    }
+
+    private void destroyCamera() {
+        if (mCamera != null) {
+            mCamera.stop();
+            mCamera = null;
+        }
     }
 }