1 /*
2  * Copyright 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 
18 package com.android.car.linkviewer;
19 
20 import static com.android.car.ui.core.CarUi.requireToolbar;
21 import static com.android.car.ui.toolbar.Toolbar.State.SUBPAGE;
22 
23 import android.app.Activity;
24 import android.content.Intent;
25 import android.graphics.Bitmap;
26 import android.graphics.Color;
27 import android.graphics.drawable.BitmapDrawable;
28 import android.os.Bundle;
29 import android.util.Log;
30 import android.widget.ImageView;
31 import android.widget.TextView;
32 
33 import com.android.car.ui.toolbar.ToolbarController;
34 
35 import com.google.zxing.WriterException;
36 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
37 import com.google.zxing.qrcode.encoder.ByteMatrix;
38 import com.google.zxing.qrcode.encoder.Encoder;
39 import com.google.zxing.qrcode.encoder.QRCode;
40 
41 /**
42  * LinkViewerActivity responds to intents to display an HTTP or HTTPS URL by showing the link and
43  * also a QR code.
44  *
45  */
46 public class LinkViewerActivity extends Activity {
47     private static final String TAG = LinkViewerActivity.class.getSimpleName();
48 
49     private TextView mUrlText;
50     private ImageView mUrlImage;
51 
52     @Override
onCreate(Bundle savedInstanceState)53     protected void onCreate(Bundle savedInstanceState) {
54         super.onCreate(savedInstanceState);
55 
56         ToolbarController toolbar = requireToolbar(this);
57         toolbar.setTitle(R.string.app_name);
58         toolbar.setState(SUBPAGE);
59 
60         String url = getUrlFromIntent(getIntent());
61         if (url == null) {
62             finish();
63             return;
64         }
65 
66         setContentView(R.layout.link_viewer_activity);
67         mUrlText = findViewById(R.id.url_text);
68         mUrlImage = findViewById(R.id.url_image);
69 
70         showUrl(url);
71     }
72 
getUrlFromIntent(Intent intent)73     private static String getUrlFromIntent(Intent intent) {
74         return intent != null ? intent.getDataString() : null;
75     }
76 
showUrl(String url)77     private void showUrl(String url) {
78         mUrlText.setText(url);
79 
80         QRCode qrCode;
81         try {
82             qrCode = Encoder.encode(url, ErrorCorrectionLevel.H);
83         } catch (WriterException e) {
84             Log.e(TAG, "Error encoding URL: " + url, e);
85             return;
86         }
87 
88         BitmapDrawable drawable = new BitmapDrawable(getResources(), qrToBitmap(qrCode));
89         drawable.setAntiAlias(false);
90         drawable.setFilterBitmap(false);
91         mUrlImage.setImageDrawable(drawable);
92     }
93 
qrToBitmap(QRCode qrCode)94     private Bitmap qrToBitmap(QRCode qrCode) {
95         ByteMatrix matrix = qrCode.getMatrix();
96         int width = matrix.getWidth();
97         int height = matrix.getHeight();
98         int[] colors = new int[width * height];
99         for (int y = 0; y < height; y++) {
100             for (int x = 0; x < width; x++) {
101                 colors[y * width + x] = (matrix.get(x, y) != 0)
102                     ? Color.WHITE
103                     : Color.TRANSPARENT;
104             }
105         }
106 
107         return Bitmap.createBitmap(colors, 0, width, width, height, Bitmap.Config.ALPHA_8);
108     }
109 }
110 
111