1. Making the App Material
We’ll start this by creating a new project and applying the material theme. If you are not aware of android material design, my previous article Android Getting Started with Material Design gives you a good start.
1. In Android Studio, go to File ⇒ New Project and fill all the details required to create a new project. When it prompts to select a default activity, select Blank Activity and proceed.
2. Open build.gradle and add android design support library com.android.support:design:23.0.1
dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:23.0.1' compile 'com.android.support:design:23.0.1'} |
3. Open colors.xml located under res ⇒ values and add the below color values.
<?xml version="1.0" encoding="utf-8"?><resources> <color name="colorPrimary">#125688</color> <color name="colorPrimaryDark">#125688</color> <color name="textColorPrimary">#FFFFFF</color> <color name="windowBackground">#FFFFFF</color> <color name="navigationBarColor">#000000</color> <color name="colorAccent">#c8e8ff</color></resources> |
4. Add the below dimensions to dimens.xml located under res ⇒ values.
<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="tab_max_width">264dp</dimen> <dimen name="tab_padding_bottom">16dp</dimen> <dimen name="tab_label">14sp</dimen> <dimen name="custom_tab_layout_height">72dp</dimen></resources> |
5. Open styles.xml located under res ⇒ values and add below styles. The styles defined in this styles.xml are common to all the android versions.
<resources> <style name="MyMaterialTheme" parent="MyMaterialTheme.Base"> </style> <style name="MyMaterialTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar"> <item name="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. Now under res, create a folder named values-v21. Inside values-v21, create another styles.xml with the below styles. These styles are specific to Android 5.0
<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. Finally open AndroidManifest.xml and modify the theme to our customized theme by changing theandroid:theme attribute value.
android:theme="@style/MyMaterialTheme" |
<?xml version="1.0" encoding="utf-8"?> package="info.androidhive.materialtabs" > <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> |
Run the app and verify the material theme by observing the notification bar color. If you see the notification bar color changed, it means that the material design theme is applied successfully.
Now we have our app material ready. So let’s start adding the tabs. But before that we’ll create few fragment activities for testing purpose. All these fragment activities contains very simple UI with only one TextView.
8. Under your main package create a fragment named OneFragment.java and add the below code.
package info.androidhive.materialtabs.fragments;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import info.androidhive.materialtabs.R;public class OneFragment extends Fragment{ public OneFragment() { // Required empty public constructor } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_one, container, false); }} |
9. Open fragment_one.xml located under res ⇒ layout and do the below changes.
android:layout_width="match_parent" android:layout_height="match_parent" tools:context="info.androidhive.materialtabs.fragments.OneFragment"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/one" android:textSize="40dp" android:textStyle="bold" android:layout_centerInParent="true"/></RelativeLayout> |
10. Likewise create few more fragment activities with same code we used for OneFragment.java. I have createdTwoFragment.java, ThreeFragment.java, FourFragemnt.java ….. upto TenFragment.java
2. Fixed Tabs
Fixed tabs should be used when you have limited number of tabs. These tabs are fixed in position. In android design support library lot of new elements like CoordinatorLayout, AppBarLayout, TabLayout and lot more were introduced. I won’t cover all of these as it’s not the agenda of this article.
11. Open the layout file of main activity (activity_main.xml) and add below layout code.
app:tabMode – Defines the mode of the tab layout. In our case the value should be “fixed”
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.design.widget.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="?attr/colorPrimary" app:layout_scrollFlags="scroll|enterAlways" app:popupTheme="@style/ThemeOverlay.AppCompat.Light" /> <android.support.design.widget.TabLayout android:id="@+id/tabs" android:layout_width="match_parent" android:layout_height="wrap_content" app:tabMode="fixed" app:tabGravity="fill"/> </android.support.design.widget.AppBarLayout> <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior" /></android.support.design.widget.CoordinatorLayout> |
12. Open MainActivity.java and do the below changes.
tabLayout.setupWithViewPager() – Assigns the ViewPager to TabLayout.
setupViewPager() – Defines the number of tabs by setting appropriate fragment and tab name.
ViewPagerAdapter – Custom adapter class provides fragments required for the view pager.
package info.androidhive.materialtabs.activity;import android.os.Bundle;import android.support.design.widget.TabLayout;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import java.util.ArrayList;import java.util.List;import info.androidhive.materialtabs.R;import info.androidhive.materialtabs.fragments.OneFragment;import info.androidhive.materialtabs.fragments.ThreeFragment;import info.androidhive.materialtabs.fragments.TwoFragment;public class MainActivity extends AppCompatActivity { private Toolbar toolbar; private TabLayout tabLayout; private ViewPager viewPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); viewPager = (ViewPager) findViewById(R.id.viewpager); setupViewPager(viewPager); tabLayout = (TabLayout) findViewById(R.id.tabs); tabLayout.setupWithViewPager(viewPager); } private void setupViewPager(ViewPager viewPager) { ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager()); adapter.addFragment(new OneFragment(), "ONE"); adapter.addFragment(new TwoFragment(), "TWO"); adapter.addFragment(new ThreeFragment(), "THREE"); viewPager.setAdapter(adapter); } class ViewPagerAdapter extends FragmentPagerAdapter { private final List<Fragment> mFragmentList = new ArrayList<>(); private final List<String> mFragmentTitleList = new ArrayList<>(); public ViewPagerAdapter(FragmentManager manager) { super(manager); } @Override public Fragment getItem(int position) { return mFragmentList.get(position); } @Override public int getCount() { return mFragmentList.size(); } public void addFragment(Fragment fragment, String title) { mFragmentList.add(fragment); mFragmentTitleList.add(title); } @Override public CharSequence getPageTitle(int position) { return mFragmentTitleList.get(position); } }} |
Now run the app. You should able to see the tabs displayed with swipe functionality between the tabs
2.1 Full Width Tabs
If you want the tabs to be occupied the fullwidth of the screen, you need to assign app:tabGravity=”fill” to our TabLayout.
2.2 Center Aligned Tabs
If you want to keep your tabs horizontally centered, assign app:tabGravity=”center” to TabLayout.
沒有留言:
張貼留言