开始学习 Material Design
你可能已经听说过 Android Lollipop 中引入的 Material Design.Material Design 引入了很多新的东西,如 Material 主题, 新的控件, 自定义阴影, 矢量绘制 and 自定义动画.如果你还没用过 Material Design,那么本文很适合你。
我们将在本文中学习 Material Design 开发的基本步骤:编写自定义主题和用 RecyclerView 实现 navigation drawer.
在下面的链接中,你能够学到更多有关 Material Design 的知识
1.下载 AndroidStudio
再往下走之前,先下载 Android Studio,并配置好本文之前提到的东西,如果你是首次使用 Android Studio,先去看看文档.
2.Material Design 颜色自定义
- Material Deisgin 提供以下系列自定义 Material Deisign 颜色主题的属性,但本文只使用 5 种基本属性来自定义整体的主题
- colorPrimaryDark - 这是 app 中最黑的基本色,主要用来做 notification bar 的背景.
- colorPrimary - 这是 app 的基本颜色,将用作 toolbar 的背景色
- textColorPrimary - 文本颜色,用于 toolbar 的标题
- windowBackground - app 默认的背景颜色
- navigationBarColor - 这个颜色定义了 navigation bar 页脚的背景色
你能选择适合你 APP 风格的颜色
3.创建 Material Design 主题
1. 在 as 中,创建新项目,选择 BlankActivity.
2. 打开 res->values->strings.xml 添加以下字符值
strings.xml
<resources>
<string name="app_name">Material Design</string>
<string name="action_settings">Settings</string>
<string name="action_search">Search</string>
<string name="drawer_open">Open</string>
<string name="drawer_close">Close</string>
<string name="nav_item_home">Home</string>
<string name="nav_item_friends">Friends</string>
<string name="nav_item_notifications">Messages</string>
<!-- navigation drawer item labels -->
<string-array name="nav_drawer_labels">
<item>@string/nav_item_home</item>
<item>@string/nav_item_friends</item>
<item>@string/nav_item_notifications</item>
</string-array>
<string name="title_messages">Messages</string>
<string name="title_friends">Friends</string>
<string name="title_home">Home</string>
</resources>
3. 打开 res->values->colors 添加以下颜色,如果你没有找到 colors.xml 文件,那么新建一个.
colors.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#F50057</color>
<color name="colorPrimaryDark">#C51162</color>
<color name="textColorPrimary">#FFFFFF</color>
<color name="windowBackground">#FFFFFF</color>
<color name="navigationBarColor">#000000</color>
<color name="colorAccent">#FF80AB</color>
</resources>
4. 打开 dimens.xml 文件,加入以下代码
dimens.xml
<resources>
<!-- Default screen margins, per the Android Design guidelines. -->
<dimen name="activity_horizontal_margin">16dp</dimen>
<dimen name="activity_vertical_margin">16dp</dimen>
<dimen name="nav_drawer_width">260dp</dimen>
</resources>
5. 打开 styles.xml 文件加入以下代码,在这里定义的 style 对于所有的 androidbanben 都是通用的。
styles.xml
<resources>
<style name="MyMaterialTheme" parent="MyMaterialTheme.Base">
</style>
<style name="MyMaterialTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="android:windowNoTitle">true</item>
<item name="windowActionBar">false</item>
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
</resources>
6. 在 res 目录下,创建一个 values-v21 目录,并 styles.xml 文件夹,这些 style 仅仅用于 Android Lollipop
styles.xml
<resources>
<style name="MyMaterialTheme" parent="MyMaterialTheme.Base">
<item name="android:windowContentTransitions">true</item>
<item name="android:windowAllowEnterTransitionOverlap">true</item>
<item name="android:windowAllowReturnTransitionOverlap">true</item>
<item name="android:windowSharedElementEnterTransition">@android:transition/move</item>
<item name="android:windowSharedElementExitTransition">@android:transition/move</item>
</style>
</resources>
7. 现在我们已经准备好 Material Design style 了, 为了使用这主题, 在 AndroidManifest.xml 文件中修改 application theme 属性如下:
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="androidhive.info.materialdesign" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/MyMaterialTheme" >
<activity
android:name=".activity.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
现在如果你运行 app,你能看到 notification 的颜色已经变成我们在 style 中设置的颜色。
3.1 添加工具栏 (Action Bar)
添加 toolbar 很简单,你要做的只是为 toolbar 另外创建一个 layout,然后你想在哪里显示它,就在那个页面布局中 include 它
8. 在 layout 目录下创建 toolbar.xml, 在里面添加 android.support.v7.widget.Toolbar,并设置宽高.代码如下:
toolbar.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
local:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
local:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
9. 打开你的 main activiy 的布局,添加如下代码:
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:orientation="vertical">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar" />
</LinearLayout>
</RelativeLayout>
现在让我尝试添加 toolbard 额标题,并启用它的行为。
10. 下载相关图片资源,然后导入到 AS 当中作为 Image Asset.
11. 导入 Image asset 步骤,右键 res 目录->new->Image Asset 之后显示弹窗,然后找到你已经下载好的图片,选择 Action Bar 和 Tab Icons, 给资源命名为 ic_search_action。
12. 一旦图片导入了,打开 menu_main.xml 添加 seach menu item,代码如下:
menu_main.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context=".MainActivity">
<item
android:id="@+id/action_search"
android:title="@string/action_search"
android:orderInCategory="100"
android:icon="@drawable/ic_action_search"
app:showAsAction="ifRoom" />
<item
android:id="@+id/action_settings"
android:title="@string/action_settings"
android:orderInCategory="100"
app:showAsAction="never" />
</menu>
13. 打开 MainActivity.java 做以下修改。
MainActivity 从 ACtionBarAcitiv 继承
调用 setSupportActionBar() 来启用 toolbar
复写 onCreateOptionsMenu() 和 onOptionsItemSelected() 来启动 toolbar 菜单子目录的行为。
MainActivity.java
private Toolbar mToolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
添加以上代码后,运行 APP。
3.2 添加 Navigation Drawer
添加 Natigation Drawer 的方式跟 lollipop 以前一样,但我们使用 RecyclerView 来实现 Menu Items.
14. 在 java 文件下创建三个包,分别命名为 activity,adapter,model,把 MainActivity 移到 activity 包种,这样整个项目看起来就更有组织性。
15. 在 build.gradle 中添加以下依赖库
build.gradle
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.0.0'
compile 'com.android.support:recyclerview-v7:21.0.+'
}
16. 在 model 包下添加 NavDrawerItem.java 文件作为 menuItem,代码如下:
NavDrawerItem.java
public class NavDrawerItem {
private boolean showNotify;
private String title;
public NavDrawerItem() {
}
public NavDrawerItem(boolean showNotify, String title) {
this.showNotify = showNotify;
this.title = title;
}
public boolean isShowNotify() {
return showNotify;
}
public void setShowNotify(boolean showNotify) {
this.showNotify = showNotify;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
17. 添加 nav_drawer_row.xml 布局文件,代码如下:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="true">
<TextView
android:id="@+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="30dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:textSize="15dp"
android:textStyle="bold" />
</RelativeLayout>
18.下载这个图片,这图片用在导航栏的头部
19.创建另一个布局文件 fragment_navigation_drawer.xml,如下代码:
fragment_navigation_drawer.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white">
<RelativeLayout
android:id="@+id/nav_header_container"
android:layout_width="match_parent"
android:layout_height="140dp"
android:layout_alignParentTop="true"
android:background="@color/colorPrimary">
<ImageView
android:layout_width="70dp"
android:layout_height="70dp"
android:src="@drawable/ic_profile"
android:scaleType="fitCenter"
android:layout_centerInParent="true" />
</RelativeLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/drawerList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/nav_header_container"
android:layout_marginTop="15dp" />
</RelativeLayout>
20. 由于 RecyclerView 是自定义的,我们需要创建一个 Adapter 来渲染自定的布局, 因此创建 NavigationDrawerAdapter.java 文件
public class NavigationDrawerAdapter extends RecyclerView.Adapter<NavigationDrawerAdapter.MyViewHolder> {
List<NavDrawerItem> data = Collections.emptyList();
private LayoutInflater inflater;
private Context context;
public NavigationDrawerAdapter(Context context, List<NavDrawerItem> data) {
this.context = context;
inflater = LayoutInflater.from(context);
this.data = data;
}
public void delete(int position) {
data.remove(position);
notifyItemRemoved(position);
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.nav_drawer_row, parent, false);
MyViewHolder holder = new MyViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
NavDrawerItem current = data.get(position);
holder.title.setText(current.getTitle());
}
@Override
public int getItemCount() {
return data.size();
}
class MyViewHolder extends RecyclerView.ViewHolder {
TextView title;
public MyViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.title);
}
}
21. 在 adapter 包下创建 FragmentDrawer.java,代码如下:
FragmentDrawer.java
public class FragmentDrawer extends Fragment {
private static String TAG = FragmentDrawer.class.getSimpleName();
private RecyclerView recyclerView;
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private NavigationDrawerAdapter adapter;
private View containerView;
private static String[] titles = null;
private FragmentDrawerListener drawerListener;
public FragmentDrawer() {
}
public void setDrawerListener(FragmentDrawerListener listener) {
this.drawerListener = listener;
}
public static List<NavDrawerItem> getData() {
List<NavDrawerItem> data = new ArrayList<>();
// preparing navigation drawer items
for (int i = 0; i < titles.length; i++) {
NavDrawerItem navItem = new NavDrawerItem();
navItem.setTitle(titles[i]);
data.add(navItem);
}
return data;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// drawer labels
titles = getActivity().getResources().getStringArray(R.array.nav_drawer_labels);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflating view layout
View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
recyclerView = (RecyclerView) layout.findViewById(R.id.drawerList);
adapter = new NavigationDrawerAdapter(getActivity(), getData());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new ClickListener() {
@Override
public void onClick(View view, int position) {
drawerListener.onDrawerItemSelected(view, position);
mDrawerLayout.closeDrawer(containerView);
}
@Override
public void onLongClick(View view, int position) {
}
}));
return layout;
}
public void setUp(int fragmentId, DrawerLayout drawerLayout, final Toolbar toolbar) {
containerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getActivity().invalidateOptionsMenu();
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
getActivity().invalidateOptionsMenu();
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
super.onDrawerSlide(drawerView, slideOffset);
toolbar.setAlpha(1 - slideOffset / 2);
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerLayout.post(new Runnable() {
@Override
public void run() {
mDrawerToggle.syncState();
}
});
}
public static interface ClickListener {
public void onClick(View view, int position);
public void onLongClick(View view, int position);
}
static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {
private GestureDetector gestureDetector;
private ClickListener clickListener;
public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) {
this.clickListener = clickListener;
gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
@Override
public void onLongPress(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null) {
clickListener.onLongClick(child, recyclerView.getChildPosition(child));
}
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, rv.getChildPosition(child));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
}
public interface FragmentDrawerListener {
public void onDrawerItemSelected(View view, int position);
}
}
22. 最后在 activity_main.xml 中添加 DrawerLayout,如下代码:
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:id="@+id/container_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar" />
</LinearLayout>
<FrameLayout
android:id="@+id/container_body"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
<fragment
android:id="@+id/fragment_navigation_drawer"
android:name="androidhive.info.materialdesign.activity.FragmentDrawer"
android:layout_width="@dimen/nav_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
app:layout="@layout/fragment_navigation_drawer"
tools:layout="@layout/fragment_navigation_drawer" />
<android.support.v4.widget.DrawerLayout>
现在我们已经完成了所有的的布局和 jav 文件,接下来我们要实现 navigation draw 而得功能.
23. 打开 MainActivity,作如下修改:
MainActivity 实现 FragmentDrawer.FragmentDrawerListener 接口,复写 onDrawerItemSelected(),创建 FragmentDrawer 实例,并设置其选择监听事件,如下代码:
public class MainActivity extends ActionBarActivity implements FragmentDrawer.FragmentDrawerListener {
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onDrawerItemSelected(View view, int position) {
}
}
3.3 实现 Navigation Drawer 的选择
虽然 navigation drawer 已经能够工作了,但是 MENU 的子选项无法工作,这是因为我们还没有处理 RecyclerView item 是的点击监听。
由于我们有三子菜单(Home,Friends&Mesages), 因此我们需要创建三个独立的 Fragment
24. 创建 fragment_home 布局文件,代码如下:
fragment_home.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="androidhive.info.materialdesign.activity.HomeFragment">
<TextView
android:id="@+id/label"
android:layout_alignParentTop="true"
android:layout_marginTop="100dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:textSize="45dp"
android:text="HOME"
android:textStyle="bold"/>
<TextView
android:layout_below="@id/label"
android:layout_centerInParent="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="12dp"
android:layout_marginTop="10dp"
android:gravity="center_horizontal"
android:text="Edit fragment_home.xml to change the appearance" />
</RelativeLayout>
25. 在 activity 包下,创建 HomeFragment.java 文件,代码如下:
public class HomeFragment extends Fragment {
public HomeFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
// Inflate the layout for this fragment
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
@Override
public void onDetach() {
super.onDetach();
}
}
26. 创建另外两个 FRAGMENT,跟上面一样
27. 做如下修改.代码如下:
displayView 方法用来显示 menu item 选中的页面.这个方法被 onDrawerItemSelected() 调用.
public class MainActivity extends ActionBarActivity implements FragmentDrawer.FragmentDrawerListener {
private static String TAG = MainActivity.class.getSimpleName();
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
// display the first navigation drawer view on app launch
displayView(0);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
if(id == R.id.action_search){
Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
private void displayView(int position) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (position) {
case 0:
fragment = new HomeFragment();
title = getString(R.string.title_home);
break;
case 1:
fragment = new FriendsFragment();
title = getString(R.string.title_friends);
break;
case 2:
fragment = new MessagesFragment();
title = getString(R.string.title_messages);
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment);
fragmentTransaction.commit();
// set the toolbar title
getSupportActionBar().setTitle(title);
}
}
}
现在运行 app,你能够选择 menu 的子菜单了。
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