MarginDesign控件使用(一)

TabLayout的使用

比如在平常的項目中實現這樣的效果，一般都是都會使用viewPageIndicate等幾個開源框架直接實現，或者使用自定義的HorizontalScroll再配合ViewPage+Fragment實現。在谷歌推出marginDesign之後，實現這種效果可以直接使用TabLayout實現。另外Tablayout可以通過自定義View自定義導航欄的效果。這樣使用的時候更加靈活多變。

首先需要導入design包

在app的build.gradle下添加design的包

dependencies {
    compile 'com.android.support:design:25.0.1'
 }

然後就開始擼起袖子，開始如何使用

在xml文件裏面寫佈局：

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<android.support.design.widget.TabLayout
    android:id="@+id/tabLayout"
    android:layout_width="match_parent"
    style="@style/MyCustomTabLayout"
    android:layout_height="wrap_content" />

<android.support.v4.view.ViewPager
    android:id="@+id/viewPager"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    />
</LinearLayout>

既然使用到了fragment，就免不了要添加下簡單的佈局：

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:text="默認" />
  </RelativeLayout>

然後是fragment和FragmentPagerAdapter的代碼。寫過的人應該對這個很熟了，就直接粘下代碼

  public class FramentAdapter extends FragmentPagerAdapter {
private String[] titles;

public FramentAdapter(FragmentManager fm, String[] titles) {
    super(fm);
    this.titles = titles;
}

@Override
public Fragment getItem(int position) {
    return  PageFragment.newInstace(position,titles);
}

@Override
public int getCount() {
    return titles.length;
}

@Override
public CharSequence getPageTitle(int position) {
    return titles[position];
}
}

Fragment的代碼：

public class PageFragment extends Fragment {
private int position;
private String[] titles;
private  Context context;
public static PageFragment newInstace(int position,  String[] titles) {
    Bundle bundle = new Bundle();
    bundle.putInt("POSITION", position);
    bundle.putStringArray("ARRAY", titles);
    PageFragment pageFragment = new PageFragment();
    pageFragment.setArguments(bundle);
    return pageFragment;
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    this.context=context;
}

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    position = getArguments().getInt("POSITION");
    titles = getArguments().getStringArray("ARRAY");
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view =inflater.inflate(R.layout.item_layout,null);
    TextView textView = (TextView) view.findViewById(R.id.textView);
    textView.setText(titles[position]);
    return view;
}
}

寫好這些之後最後在MainActivity中看下如何使用：

public class MainActivity extends FragmentActivity  {
private TabLayout tabLayout;
private ViewPager viewPager;
private String[] titles = {"黃蓉", "郭靖", "楊過", "小龍女", "尹志平", "金輪法王", "收到貨就收到貨聖誕節"};
private TextView textView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tabLayout = (TabLayout) findViewById(R.id.tabLayout);
    viewPager = (ViewPager) findViewById(R.id.viewPager);
    FramentAdapter framentAdapter = new FramentAdapter(getSupportFragmentManager(), titles);
    viewPager.setAdapter(framentAdapter);
    tabLayout.setupWithViewPager(viewPager);
    tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);}
    }

viewPager.setAdapter(framentAdapter);這行代碼必須在下面這行代碼之前。有興趣的可以看下源碼。 tabLayout.setupWithViewPager(viewPager);
另外 tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);給tablayout設置了這種模式，mode有兩種，這種模式大概的意思是，我內容很多的時候，可以使tab平鋪滑動。
很多時候我們需要自己自定義樣式或者要自定義我們的tab。
自定義樣式：
需要在Style文件下添加自己的樣式，然後應用就好了，例如；

<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
    <item name="tabIndicatorColor">?attr/colorAccent</item>
    <item name="tabIndicatorHeight">2dp</item>
    <item name="tabPaddingStart">12dp</item>
    <item name="tabPaddingEnd">12dp</item>
    <item name="tabBackground">?attr/selectableItemBackground</item>
    <item name="tabTextAppearance">@style/MyCustomTabTextAppearance</item>
    <item name="tabSelectedTextColor">?android:textColorPrimary</item>
</style>
<style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
    <item name="android:textSize">14sp</item>
    <item name="android:textColor">?android:textColorSecondary</item>
    <item name="textAllCaps">true</item>
</style>

另外一種就是需要添加我們自定義的View：
首先寫要定義的佈局文件；

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">

<TextView
    android:id="@id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
   />

<TextView
    android:layout_width="10dp"
    android:layout_height="10dp"
    android:background="@drawable/bg_text" />
</LinearLayout>

然後稍微修改下FragmentPagerAdapter的代碼

 public class FramentAdapter extends FragmentPagerAdapter {
private String[] titles;

public FramentAdapter(FragmentManager fm, String[] titles) {
    super(fm);
    this.titles = titles;
}

@Override
public Fragment getItem(int position) {
    return  PageFragment.newInstace(position,titles);
}

@Override
public int getCount() {
    return titles.length;
}

@Override
public CharSequence getPageTitle(int position) {
    return null;
}
}

最後看下怎麼在MainActivity中使用。

public class MainActivity extends FragmentActivity  {
private TabLayout tabLayout;
private ViewPager viewPager;
private String[] titles = {"黃蓉", "郭靖", "楊過", "小龍女", "尹志平", "金輪法王", "收到貨就收到貨聖誕節"};
private TextView textView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tabLayout = (TabLayout) findViewById(R.id.tabLayout);
    viewPager = (ViewPager) findViewById(R.id.viewPager);
    FramentAdapter framentAdapter = new FramentAdapter(getSupportFragmentManager(), titles);
    viewPager.setAdapter(framentAdapter);
    tabLayout.setupWithViewPager(viewPager);
    tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
    for (int i = 0; i < tabLayout.getTabCount(); i++) {
        TabLayout.Tab tab = tabLayout.getTabAt(i);
        tab.setCustomView(getTabView(i));
    }
}

private View getTabView(int position) {
    View view = View.inflate(this, R.layout.item_tab_view, null);
    textView = (TextView) view.findViewById(R.id.textView);
    textView.setText(titles[position]);
    return view;
}
}

到這裏就結束了TabLayout的使用。放下源碼：Tablayout的使用