1 /*
2  * Copyright (C) 2008 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 package com.example.android.apis.graphics;
18 
19 //Need the following import to get access to the app resources, since this
20 //class is in a sub-package.
21 import com.example.android.apis.R;
22 
23 import android.app.Activity;
24 import android.os.Bundle;
25 import android.graphics.BitmapFactory;
26 import android.graphics.Bitmap;
27 import android.graphics.Canvas;
28 import android.graphics.drawable.BitmapDrawable;
29 import android.graphics.drawable.Drawable;
30 import android.widget.LinearLayout;
31 import android.widget.TextView;
32 import android.widget.ScrollView;
33 import android.view.LayoutInflater;
34 import android.view.View;
35 import android.content.Context;
36 import android.util.DisplayMetrics;
37 import android.util.Log;
38 
39 /**
40  * This activity demonstrates various ways density can cause the scaling of
41  * bitmaps and drawables.
42  */
43 public class DensityActivity extends Activity {
44     @Override
onCreate(Bundle savedInstanceState)45     protected void onCreate(Bundle savedInstanceState) {
46         super.onCreate(savedInstanceState);
47 
48         final LayoutInflater li = (LayoutInflater)getSystemService(
49                 LAYOUT_INFLATER_SERVICE);
50 
51         this.setTitle(R.string.density_title);
52         LinearLayout root = new LinearLayout(this);
53         root.setOrientation(LinearLayout.VERTICAL);
54 
55         LinearLayout layout = new LinearLayout(this);
56         addBitmapDrawable(layout, R.drawable.logo120dpi, true);
57         addBitmapDrawable(layout, R.drawable.logo160dpi, true);
58         addBitmapDrawable(layout, R.drawable.logo240dpi, true);
59         addLabelToRoot(root, "Prescaled bitmap in drawable");
60         addChildToRoot(root, layout);
61 
62         layout = new LinearLayout(this);
63         addBitmapDrawable(layout, R.drawable.logo120dpi, false);
64         addBitmapDrawable(layout, R.drawable.logo160dpi, false);
65         addBitmapDrawable(layout, R.drawable.logo240dpi, false);
66         addLabelToRoot(root, "Autoscaled bitmap in drawable");
67         addChildToRoot(root, layout);
68 
69         layout = new LinearLayout(this);
70         addResourceDrawable(layout, R.drawable.logo120dpi);
71         addResourceDrawable(layout, R.drawable.logo160dpi);
72         addResourceDrawable(layout, R.drawable.logo240dpi);
73         addLabelToRoot(root, "Prescaled resource drawable");
74         addChildToRoot(root, layout);
75 
76         layout = (LinearLayout)li.inflate(R.layout.density_image_views, null);
77         addLabelToRoot(root, "Inflated layout");
78         addChildToRoot(root, layout);
79 
80         layout = (LinearLayout)li.inflate(R.layout.density_styled_image_views, null);
81         addLabelToRoot(root, "Inflated styled layout");
82         addChildToRoot(root, layout);
83 
84         layout = new LinearLayout(this);
85         addCanvasBitmap(layout, R.drawable.logo120dpi, true);
86         addCanvasBitmap(layout, R.drawable.logo160dpi, true);
87         addCanvasBitmap(layout, R.drawable.logo240dpi, true);
88         addLabelToRoot(root, "Prescaled bitmap");
89         addChildToRoot(root, layout);
90 
91         layout = new LinearLayout(this);
92         addCanvasBitmap(layout, R.drawable.logo120dpi, false);
93         addCanvasBitmap(layout, R.drawable.logo160dpi, false);
94         addCanvasBitmap(layout, R.drawable.logo240dpi, false);
95         addLabelToRoot(root, "Autoscaled bitmap");
96         addChildToRoot(root, layout);
97 
98         layout = new LinearLayout(this);
99         addResourceDrawable(layout, R.drawable.logonodpi120);
100         addResourceDrawable(layout, R.drawable.logonodpi160);
101         addResourceDrawable(layout, R.drawable.logonodpi240);
102         addLabelToRoot(root, "No-dpi resource drawable");
103         addChildToRoot(root, layout);
104 
105         layout = new LinearLayout(this);
106         addNinePatchResourceDrawable(layout, R.drawable.smlnpatch120dpi);
107         addNinePatchResourceDrawable(layout, R.drawable.smlnpatch160dpi);
108         addNinePatchResourceDrawable(layout, R.drawable.smlnpatch240dpi);
109         addLabelToRoot(root, "Prescaled 9-patch resource drawable");
110         addChildToRoot(root, layout);
111 
112         setContentView(scrollWrap(root));
113     }
114 
scrollWrap(View view)115     private View scrollWrap(View view) {
116         ScrollView scroller = new ScrollView(this);
117         scroller.addView(view, new ScrollView.LayoutParams(ScrollView.LayoutParams.MATCH_PARENT,
118                 ScrollView.LayoutParams.MATCH_PARENT));
119         return scroller;
120     }
121 
addLabelToRoot(LinearLayout root, String text)122     private void addLabelToRoot(LinearLayout root, String text) {
123         TextView label = new TextView(this);
124         label.setText(text);
125         root.addView(label, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
126                 LinearLayout.LayoutParams.WRAP_CONTENT));
127     }
128 
addChildToRoot(LinearLayout root, LinearLayout layout)129     private void addChildToRoot(LinearLayout root, LinearLayout layout) {
130         root.addView(layout, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
131                 LinearLayout.LayoutParams.WRAP_CONTENT));
132     }
133 
addBitmapDrawable(LinearLayout layout, int resource, boolean scale)134     private void addBitmapDrawable(LinearLayout layout, int resource, boolean scale) {
135         Bitmap bitmap;
136         bitmap = loadAndPrintDpi(resource, scale);
137 
138         View view = new View(this);
139 
140         final BitmapDrawable d = new BitmapDrawable(getResources(), bitmap);
141         if (!scale) d.setTargetDensity(getResources().getDisplayMetrics());
142         view.setBackgroundDrawable(d);
143 
144         view.setLayoutParams(new LinearLayout.LayoutParams(d.getIntrinsicWidth(),
145                 d.getIntrinsicHeight()));
146         layout.addView(view);
147     }
148 
addResourceDrawable(LinearLayout layout, int resource)149     private void addResourceDrawable(LinearLayout layout, int resource) {
150         View view = new View(this);
151 
152         final Drawable d = getResources().getDrawable(resource);
153         view.setBackgroundDrawable(d);
154 
155         view.setLayoutParams(new LinearLayout.LayoutParams(d.getIntrinsicWidth(),
156                 d.getIntrinsicHeight()));
157         layout.addView(view);
158     }
159 
addCanvasBitmap(LinearLayout layout, int resource, boolean scale)160     private void addCanvasBitmap(LinearLayout layout, int resource, boolean scale) {
161         Bitmap bitmap;
162         bitmap = loadAndPrintDpi(resource, scale);
163 
164         ScaledBitmapView view = new ScaledBitmapView(this, bitmap);
165 
166         view.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
167                 LinearLayout.LayoutParams.WRAP_CONTENT));
168         layout.addView(view);
169     }
170 
addNinePatchResourceDrawable(LinearLayout layout, int resource)171     private void addNinePatchResourceDrawable(LinearLayout layout, int resource) {
172         View view = new View(this);
173 
174         final Drawable d = getResources().getDrawable(resource);
175         view.setBackgroundDrawable(d);
176 
177         Log.i("foo", "9-patch #" + Integer.toHexString(resource)
178                 + " w=" + d.getIntrinsicWidth() + " h=" + d.getIntrinsicHeight());
179         view.setLayoutParams(new LinearLayout.LayoutParams(
180                 d.getIntrinsicWidth()*2, d.getIntrinsicHeight()*2));
181         layout.addView(view);
182     }
183 
loadAndPrintDpi(int id, boolean scale)184     private Bitmap loadAndPrintDpi(int id, boolean scale) {
185         Bitmap bitmap;
186         if (scale) {
187             bitmap = BitmapFactory.decodeResource(getResources(), id);
188         } else {
189             BitmapFactory.Options opts = new BitmapFactory.Options();
190             opts.inScaled = false;
191             bitmap = BitmapFactory.decodeResource(getResources(), id, opts);
192         }
193         return bitmap;
194     }
195 
196     private class ScaledBitmapView extends View {
197         private Bitmap mBitmap;
198 
ScaledBitmapView(Context context, Bitmap bitmap)199         public ScaledBitmapView(Context context, Bitmap bitmap) {
200             super(context);
201             mBitmap = bitmap;
202         }
203 
204         @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)205         protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
206             super.onMeasure(widthMeasureSpec, heightMeasureSpec);
207             final DisplayMetrics metrics = getResources().getDisplayMetrics();
208             setMeasuredDimension(
209                     mBitmap.getScaledWidth(metrics),
210                     mBitmap.getScaledHeight(metrics));
211         }
212 
213         @Override
onDraw(Canvas canvas)214         protected void onDraw(Canvas canvas) {
215             super.onDraw(canvas);
216 
217             canvas.drawBitmap(mBitmap, 0.0f, 0.0f, null);
218         }
219     }
220 }
221