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/mth/src/main/java/net/yanzm/mth/MaterialTabHost.java:
--------------------------------------------------------------------------------
1 | /*
2 | Copyright (C) 2014 Yuki Anzai anzai.y.aa@gmail.com
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 net.yanzm.mth;
18 |
19 | import android.content.Context;
20 | import android.content.res.Resources;
21 | import android.content.res.TypedArray;
22 | import android.graphics.Canvas;
23 | import android.graphics.PorterDuff;
24 | import android.graphics.drawable.ColorDrawable;
25 | import android.graphics.drawable.Drawable;
26 | import android.graphics.drawable.ShapeDrawable;
27 | import android.graphics.drawable.StateListDrawable;
28 | import android.os.Build;
29 | import android.support.v4.view.ViewCompat;
30 | import android.support.v4.view.ViewPager;
31 | import android.util.AttributeSet;
32 | import android.util.TypedValue;
33 | import android.view.Gravity;
34 | import android.view.LayoutInflater;
35 | import android.view.View;
36 | import android.widget.FrameLayout;
37 | import android.widget.LinearLayout;
38 | import android.widget.TabHost;
39 | import android.widget.TabWidget;
40 | import android.widget.TextView;
41 |
42 | /**
43 | * MaterialTabHost make easy to create Material Design Fixed Tabs
44 | * http://www.google.com/design/spec/components/tabs.html
45 | */
46 | public class MaterialTabHost extends TabHost implements ViewPager.OnPageChangeListener {
47 |
48 | // http://www.google.com/design/spec/what-is-material/objects-in-3d-space.html#objects-in-3d-space-elevation
49 | private static final int APP_TAB_ELEVATION = 4; // 4dp
50 |
51 | public static enum Type {
52 | FullScreenWidth, Centered, LeftOffset;
53 | }
54 |
55 | public interface OnTabChangeListener {
56 | public void onTabSelected(int position);
57 | }
58 |
59 | private final LayoutInflater inflater;
60 | private final TabWidget tabWidget;
61 |
62 | private final ShapeDrawable indicator;
63 | private final int indicatorHeight;
64 | private final int leftOffset;
65 | private final int colorControlActivated;
66 |
67 | private Type type = Type.FullScreenWidth;
68 | private OnTabChangeListener listener;
69 |
70 | private int maxTabWidth = Integer.MIN_VALUE;
71 | private int scrollingState = ViewPager.SCROLL_STATE_IDLE;
72 | private int position = 0;
73 | private float positionOffset = 0;
74 |
75 | public MaterialTabHost(Context context) {
76 | this(context, null);
77 | }
78 |
79 | public MaterialTabHost(Context context, AttributeSet attrs) {
80 | super(context, attrs);
81 |
82 | inflater = LayoutInflater.from(context);
83 |
84 | TypedValue outValue = new TypedValue();
85 | Resources.Theme theme = context.getTheme();
86 |
87 | // use ?attr/colorPrimary as background color
88 | theme.resolveAttribute(R.attr.colorPrimary, outValue, true);
89 | setBackgroundColor(outValue.data);
90 |
91 | // use ?attr/colorControlActivated as default indicator color
92 | theme.resolveAttribute(R.attr.colorControlActivated, outValue, true);
93 | colorControlActivated = outValue.data;
94 |
95 | TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.MaterialTabHost, 0, 0);
96 | int indicatorColor = a.getColor(R.styleable.MaterialTabHost_colorTabIndicator, colorControlActivated);
97 | a.recycle();
98 |
99 | // ColorDrawable on 2.x does not use getBounds() so use ShapeDrawable
100 | indicator = new ShapeDrawable();
101 | indicator.setColorFilter(indicatorColor, PorterDuff.Mode.SRC_ATOP);
102 |
103 | Resources res = context.getResources();
104 | indicatorHeight = res.getDimensionPixelSize(R.dimen.mth_tab_indicator_height);
105 | leftOffset = res.getDimensionPixelSize(R.dimen.mth_tab_left_offset);
106 | int tabHeight = res.getDimensionPixelSize(R.dimen.mth_tab_height);
107 |
108 | tabWidget = new TabWidget(context);
109 | tabWidget.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, tabHeight));
110 | tabWidget.setId(android.R.id.tabs);
111 | tabWidget.setStripEnabled(false);
112 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
113 | tabWidget.setShowDividers(LinearLayout.SHOW_DIVIDER_NONE);
114 | }
115 | addView(tabWidget);
116 |
117 | FrameLayout fl = new FrameLayout(context);
118 | fl.setLayoutParams(new LayoutParams(0, 0));
119 | fl.setId(android.R.id.tabcontent);
120 | addView(fl);
121 |
122 | setup();
123 |
124 | setOnTabChangedListener(new TabHost.OnTabChangeListener() {
125 | @Override
126 | public void onTabChanged(String tabId) {
127 | if (listener != null) {
128 | listener.onTabSelected(Integer.valueOf(tabId));
129 | }
130 | }
131 | });
132 |
133 | float density = getResources().getDisplayMetrics().density;
134 |
135 | // set elevation for App bar
136 | // http://www.google.com/design/spec/what-is-material/objects-in-3d-space.html#objects-in-3d-space-elevation
137 | ViewCompat.setElevation(this, APP_TAB_ELEVATION * density);
138 | }
139 |
140 | protected int getLayoutId(Type type) {
141 | switch (type) {
142 | case FullScreenWidth:
143 | return R.layout.mth_tab_widget_full;
144 | case Centered:
145 | return R.layout.mth_tab_widget;
146 | case LeftOffset:
147 | return R.layout.mth_tab_widget;
148 | default:
149 | return R.layout.mth_tab_widget_full;
150 | }
151 | }
152 |
153 | /**
154 | * add new tab with title text
155 | *
156 | * @param title title text
157 | */
158 | public void addTab(CharSequence title) {
159 | int layoutId = getLayoutId(type);
160 | TextView tv = (TextView) inflater.inflate(layoutId, tabWidget, false);
161 | tv.setText(title);
162 |
163 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
164 | tv.setBackgroundResource(R.drawable.mth_tab_widget_background_ripple);
165 |
166 | } else {
167 | // create background using colorControlActivated
168 | StateListDrawable d = new StateListDrawable();
169 | d.addState(new int[]{android.R.attr.state_pressed}, new ColorDrawable(colorControlActivated));
170 | d.setAlpha(180);
171 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
172 | tv.setBackground(d);
173 | } else {
174 | tv.setBackgroundDrawable(d);
175 | }
176 | }
177 |
178 | int tabId = tabWidget.getTabCount();
179 |
180 | addTab(newTabSpec(String.valueOf(tabId))
181 | .setIndicator(tv)
182 | .setContent(android.R.id.tabcontent));
183 | }
184 |
185 | /**
186 | * add new tab with specified view
187 | *
188 | * @param view tab view
189 | */
190 | public void addTab(View view) {
191 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
192 | view.setBackgroundResource(R.drawable.mth_tab_widget_background_ripple);
193 |
194 | } else {
195 | // create background using colorControlActivated
196 | StateListDrawable d = new StateListDrawable();
197 | d.addState(new int[]{android.R.attr.state_pressed}, new ColorDrawable(colorControlActivated));
198 | d.setAlpha(180);
199 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
200 | view.setBackground(d);
201 | } else {
202 | view.setBackgroundDrawable(d);
203 | }
204 | }
205 |
206 | int tabId = tabWidget.getTabCount();
207 |
208 | addTab(newTabSpec(String.valueOf(tabId))
209 | .setIndicator(view)
210 | .setContent(android.R.id.tabcontent));
211 | }
212 |
213 | @Override
214 | protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
215 | if (type == Type.Centered) {
216 | if (maxTabWidth == Integer.MIN_VALUE) {
217 | for (int i = 0; i < tabWidget.getTabCount(); i++) {
218 | View tabView = tabWidget.getChildTabViewAt(i);
219 | if (tabView.getMeasuredWidth() > maxTabWidth) {
220 | maxTabWidth = tabView.getMeasuredWidth();
221 | }
222 | }
223 |
224 | if (maxTabWidth > 0) {
225 | for (int i = 0; i < tabWidget.getTabCount(); i++) {
226 | View tabView = tabWidget.getChildTabViewAt(i);
227 | LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) tabView.getLayoutParams();
228 | params.width = maxTabWidth;
229 | tabView.setLayoutParams(params);
230 | }
231 | }
232 | }
233 | }
234 |
235 | super.onLayout(changed, left, top, right, bottom);
236 | }
237 |
238 |
239 | @Override
240 | protected void dispatchDraw(Canvas canvas) {
241 | super.dispatchDraw(canvas);
242 |
243 | if (getChildCount() == 0) {
244 | return;
245 | }
246 |
247 | final Drawable d = indicator;
248 |
249 | View tabView = tabWidget.getChildTabViewAt(position);
250 | if (tabView == null) {
251 | return;
252 | }
253 |
254 | View nextTabView = position + 1 < tabWidget.getTabCount()
255 | ? tabWidget.getChildTabViewAt(position + 1)
256 | : null;
257 |
258 | int tabWidth = tabView.getWidth();
259 | int nextTabWidth = nextTabView == null ? tabWidth : nextTabView.getWidth();
260 |
261 | int indicatorWidth = (int) (nextTabWidth * positionOffset + tabWidth * (1 - positionOffset));
262 | int indicatorLeft = (int) (getPaddingLeft() + tabView.getLeft() + positionOffset * tabWidth);
263 |
264 | int height = getHeight();
265 | d.setBounds(indicatorLeft, height - indicatorHeight, indicatorLeft + indicatorWidth, height);
266 | d.draw(canvas);
267 | }
268 |
269 | public void setOnTabChangeListener(OnTabChangeListener l) {
270 | listener = l;
271 | }
272 |
273 | public void setType(Type type) {
274 | this.type = type;
275 |
276 | switch (type) {
277 | case FullScreenWidth:
278 | tabWidget.setGravity(Gravity.LEFT);
279 | setPadding(0, 0, 0, 0);
280 | break;
281 | case Centered:
282 | tabWidget.setGravity(Gravity.CENTER_HORIZONTAL);
283 | setPadding(0, 0, 0, 0);
284 | break;
285 | case LeftOffset:
286 | tabWidget.setGravity(Gravity.LEFT);
287 | setPadding(leftOffset, 0, 0, 0);
288 | break;
289 | default:
290 | tabWidget.setGravity(Gravity.LEFT);
291 | setPadding(0, 0, 0, 0);
292 | }
293 | }
294 |
295 | @Override
296 | public void onPageSelected(int position) {
297 | if (scrollingState == ViewPager.SCROLL_STATE_IDLE) {
298 | updateIndicatorPosition(position, 0);
299 | }
300 | setCurrentTab(position);
301 | }
302 |
303 | @Override
304 | public void onPageScrollStateChanged(int state) {
305 | scrollingState = state;
306 | }
307 |
308 | @Override
309 | public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
310 | updateIndicatorPosition(position, positionOffset);
311 | }
312 |
313 | private void updateIndicatorPosition(int position, float positionOffset) {
314 | this.position = position;
315 | this.positionOffset = positionOffset;
316 | invalidate();
317 | }
318 | }
319 |
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