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想法是，使用SmartTabLabyout庫（https://github.com/ogaclejapan/SmartTabLayout），爲每個選項卡充氣自定義視圖。由於某種原因，它不想工作。基碼如下：SmartTabLayout自定義選項卡視圖充氣
活動：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager mViewPager = (ViewPager) findViewById(R.id.pager);
SmartTabLayout viewPagerTab = (SmartTabLayout) findViewById(R.id.viewpagertab);
MainActivityViewPagerAdapter mPagerAdapter = new MainActivityViewPagerAdapter(getSupportFragmentManager(), this);
viewPagerTab.setCustomTabView(mPagerAdapter);
mViewPager.setAdapter(mPagerAdapter);
viewPagerTab.setViewPager(mViewPager);
}
}
適配器：
public class MainActivityViewPagerAdapter extends FragmentPagerAdapter implements SmartTabLayout.TabProvider {
public enum MainActivityPages {
TAB_1(0, "Tab #1", R.drawable.tab_icon_1, TabFragment1.newInstance()),
TAB_2(1, "Tab #2", R.drawable.tab_icon_2, TabFragment2.newInstance()),
TAB_3(2, "Tab #3", R.drawable.tab_icon_3, TabFragment3.newInstance());
public int index;
public String title;
public int resourceId;
public Fragment fragment;
MainActivityPages(int index, String title, int resourceId, Fragment fragment) {
this.index = index;
this.title = title;
this.resourceId = resourceId;
this.fragment = fragment;
}
}
public MainActivityViewPagerAdapter(FragmentManager fm, Context context) {
super(fm);
this.context = context;
}
@Override
public Fragment getItem(int position) {
return MainActivityPages.values()[position].fragment;
}
@Override
public int getCount() {
return MainActivityPages.values().length;
}
@Override
public CharSequence getPageTitle(int position) {
return MainActivityPages.values()[position].title;
}
@Override
public View createTabView(ViewGroup container, int position, PagerAdapter adapter) {
View v = LayoutInflater.from(this.context).inflate(R.layout.activity_main_tab, null);
if(v != null) {
ImageView icon = (ImageView) v.findViewById(R.id.activity_main_tab_icon);
icon.setImageResource(MainActivityPages.values()[position].resourceId);
}
return v;
}
}
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF">
<com.ogaclejapan.smarttablayout.SmartTabLayout
android:id="@+id/viewpagertab"
android:layout_width="match_parent"
android:layout_height="48dp"
app:stl_indicatorAlwaysInCenter="false"
app:stl_indicatorWithoutPadding="false"
app:stl_indicatorInFront="false"
app:stl_indicatorInterpolation="smart"
app:stl_indicatorGravity="bottom"
app:stl_indicatorColor="#40C4FF"
app:stl_indicatorThickness="4dp"
app:stl_indicatorWidth="auto"
app:stl_indicatorCornerRadius="2dp"
app:stl_overlineColor="#4D000000"
app:stl_overlineThickness="0dp"
app:stl_underlineColor="#FFFFFF"
app:stl_underlineThickness="0dp"
app:stl_dividerColor="#FFFFFF"
app:stl_dividerThickness="0dp"
app:stl_defaultTabBackground="?attr/selectableItemBackground"
app:stl_defaultTabTextAllCaps="true"
app:stl_defaultTabTextColor="#FC000000"
app:stl_defaultTabTextSize="12sp"
app:stl_defaultTabTextHorizontalPadding="16dp"
app:stl_defaultTabTextMinWidth="0dp"
app:stl_distributeEvenly="true"
app:stl_clickable="true"
app:stl_titleOffset="24dp"
app:stl_drawDecorationAfterTab="false" />
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".MainActivity" />
</LinearLayout>
activity_main_tab.xml：
<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/activity_main_tab_icon"
android:layout_width="match_parent"
android:layout_height="match_parent" />
上面的代碼會產生這個
java.lang.RuntimeException: Unable to start activity ComponentInfo{.activities.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3724)
at android.app.ActivityThread.access$900(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.ogaclejapan.smarttablayout.SmartTabLayout.populateTabStrip(SmartTabLayout.java:398)
at com.ogaclejapan.smarttablayout.SmartTabLayout.setViewPager(SmartTabLayout.java:327)
at com.insertcoin.apps.vindr.activities.MainActivity$override.onCreate(MainActivity.java:63)
at com.insertcoin.apps.vindr.activities.MainActivity$override.access$dispatch(MainActivity.java)
at com.insertcoin.apps.vindr.activities.MainActivity.onCreate(MainActivity.java:0)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3724)
at android.app.ActivityThread.access$900(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
我缺少什麼？