问题
I have setup tabs as UPDATE 29/05/2015 this post. Tabs take full width on my Nexus 4 mobile but on nexus 7 tablet it in center and not cover full screen width.
Nexus 7 screenshot
Nexus 4 screenshot
回答1:
A "simpler" answer borrowed from Kaizie would just be adding app:tabMaxWidth="0dp" in your TabLayout xml:
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMaxWidth="0dp"
app:tabGravity="fill"
app:tabMode="fixed" />
回答2:
I had the same problem and I checked the TabLayout style, and i found that its default style is Widget.Design.TabLayout which has different implementations (normal, landscape and sw600dp).
The one we need is the one for tablets (sw600dp) which has the following implementation:
<style name="Widget.Design.TabLayout" parent="Base.Widget.Design.TabLayout">
<item name="tabGravity">center</item>
<item name="tabMode">fixed</item>
</style>
From this style we will use "tabGravity" (which possible values are "center" or "fill") using the "fill" value.
But we need to go deeper, and then we see that this one extends from Base.Widget.Design.TabLayout, which implementation is:
<style name="Base.Widget.Design.TabLayout" parent="android:Widget">
<item name="tabMaxWidth">@dimen/tab_max_width</item>
<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/TextAppearance.Design.Tab</item>
<item name="tabSelectedTextColor">?android:textColorPrimary</item>
</style>
So, from this style we will need to override "tabMaxWidth".
In my case I set it to 0dp, so it has no limit.
And my style looked like this:
<style name="MyTabLayout" parent="Widget.Design.TabLayout">
<item name="tabGravity">fill</item>
<item name="tabMaxWidth">0dp</item>
</style>
And then the tab bar will fill the whole screen from side to side.
回答3:
Solution for scrollable: (TabLayout.MODE_SCROLLABLE), that is when ever you need more than 2 tabs (Dynamic tabs)
Step 1 : style.xml
<style name="tabCustomStyle" parent="Widget.Design.TabLayout">
<item name="tabGravity">fill</item>
<item name="tabMaxWidth">0dp</item>
<item name="tabIndicatorColor">#FFFEEFC4</item>
<item name="tabIndicatorHeight">2dp</item>
<item name="tabTextAppearance">@style/MyCustomTabTextAppearance</item>
<item name="tabSelectedTextColor">#FFFEEFC4</item>
</style>
<style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
<item name="android:textSize">@dimen/tab_text_size</item>
<item name="android:textAppearance">@style/TextAppearance.roboto_medium</item>
<item name="textAllCaps">true</item>
</style>
<style name="TextAppearance.roboto_medium" parent="android:TextAppearance">
<item name="android:fontFamily">sans-serif-medium</item>
</style>
Step 2 : Your xml layout
<android.support.design.widget.TabLayout
android:id="@+id/sliding_tabs"
style="@style/tabCustomStyle"
android:layout_width="match_parent"
android:layout_height="@dimen/tab_strip_height"
android:background="@color/your_color"
app:tabMode="scrollable"
app:tabTextColor="@color/your_color" />
Step 3: In your Activity/Fragment where ever you have tabs.
/**
* To allow equal width for each tab, while (TabLayout.MODE_SCROLLABLE)
*/
private void allotEachTabWithEqualWidth() {
ViewGroup slidingTabStrip = (ViewGroup) mTabLayout.getChildAt(0);
for (int i = 0; i < mTabLayout.getTabCount(); i++) {
View tab = slidingTabStrip.getChildAt(i);
LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) tab.getLayoutParams();
layoutParams.weight = 1;
tab.setLayoutParams(layoutParams);
}
}
回答4:
To force tabs to take up the full width (split into equal sizes), apply the following to the TabLayout view:
TabLayout tabLayout = (TabLayout) findViewById(R.id.your_tab_layout);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setTabMode(TabLayout.MODE_FIXED);
回答5:
This is helpful you must try
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMaxWidth="0dp"
app:tabGravity="fill"
app:tabMode="fixed"
app:tabIndicatorColor="@color/white"
app:tabSelectedTextColor="@color/white"
app:tabTextColor="@color/orange" />
回答6:
For me the following code worked and was enough.
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabGravity="fill"/>
回答7:
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMaxWidth="0dp"
app:tabGravity="fill"
app:tabMode="fixed" />
work for me. This also have xmlns:app="http://schemas.android.com/apk/res-auto"
回答8:
Check below code for solutions.
Below is layout code:
<com.yourpackage.CustomTabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/off_white"
app:tabIndicatorColor="@color/primaryColor"
app:tabIndicatorHeight="3dp"
app:tabMode="scrollable"
app:tabPaddingEnd="0dp"
app:tabPaddingStart="0dp" />
Note, for dynamic tab count, don't forget to call setTabNumbers(tabcount).
import android.content.Context;
import android.support.design.widget.TabLayout;
import android.util.AttributeSet;
import android.util.
import java.lang.reflect.Field;
public class CustomTabLayout extends TabLayout
{
private static final int WIDTH_INDEX = 0;
private int DIVIDER_FACTOR = 3;
private static final String SCROLLABLE_TAB_MIN_WIDTH = "mScrollableTabMinWidth";
public CustomTabLayout(Context context) {
super(context);
initTabMinWidth();
}
public CustomTabLayout(Context context, AttributeSet attrs) {
super(context, attrs);
initTabMinWidth();
}
public CustomTabLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initTabMinWidth();
}
public void setTabNumbers(int num)
{
this.DIVIDER_FACTOR = num;
initTabMinWidth();
}
private void initTabMinWidth()
{
int[] wh = getScreenSize(getContext());
int tabMinWidth = wh[WIDTH_INDEX] / DIVIDER_FACTOR;
Log.v("CUSTOM TAB LAYOUT", "SCREEN WIDTH = " + wh[WIDTH_INDEX] + " && tabTotalWidth = " + (tabMinWidth*DIVIDER_FACTOR) + " && TotalTabs = " + DIVIDER_FACTOR);
Field field;
try {
field = TabLayout.class.getDeclaredField(SCROLLABLE_TAB_MIN_WIDTH);
field.setAccessible(true);
field.set(this, tabMinWidth);
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
private static final int WIDTH_INDEX = 0;
private static final int HEIGHT_INDEX = 1;
public static int[] getScreenSize(Context context) {
int[] widthHeight = new int[2];
widthHeight[WIDTH_INDEX] = 0;
widthHeight[HEIGHT_INDEX] = 0;
try {
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
Point size = new Point();
display.getSize(size);
widthHeight[WIDTH_INDEX] = size.x;
widthHeight[HEIGHT_INDEX] = size.y;
if (!isScreenSizeRetrieved(widthHeight))
{
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
widthHeight[0] = metrics.widthPixels;
widthHeight[1] = metrics.heightPixels;
}
// Last defense. Use deprecated API that was introduced in lower than API 13
if (!isScreenSizeRetrieved(widthHeight)) {
widthHeight[0] = display.getWidth(); // deprecated
widthHeight[1] = display.getHeight(); // deprecated
}
} catch (Exception e) {
e.printStackTrace();
}
return widthHeight;
}
private static boolean isScreenSizeRetrieved(int[] widthHeight) {
return widthHeight[WIDTH_INDEX] != 0 && widthHeight[HEIGHT_INDEX] != 0;
}
}
Reference taken from https://medium.com/@elsenovraditya/set-tab-minimum-width-of-scrollable-tablayout-programmatically-8146d6101efe
回答9:
Why all that hectic work ?
Just put app:tabMode="scrollable" in your TabLayout in XML.
Thats it.
回答10:
In my variant of this problem, I had 3 tabs of moderate size which weren't taking up full width on tablets. I didn't need the tabs to be scrollable on tablets, since tablets are big enough to display the tabs all together without any scrolling. But I did need the tabs to be scrollable on phones, since phones are too small to display all the tabs together.
The best solution in my case was to add a res/layout-sw600dp/main_activity.xml file, where the relevant TabLayout could have app:tabGravity="fill" and app:tabMode="fixed". But in my regular res/layout/main_activity.xml, I left out app:tabGravity="fill" and app:tabMode="fixed", and had app:tabMode="scrollable" instead.
回答11:
Solution for Scrollable (Kotlin)
In xml:
<com.google.android.material.tabs.TabLayout
android:id="@+id/home_tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMaxWidth="0dp"
app:tabMode="scrollable"
android:fillViewport="true"
app:tabGravity="fill" />
In Kotlin:
In my case if less than 3 tabs I allocate equal space.
Note: If condition is as per your requirement
if(list.size <= 3){
allotEachTabWithEqualWidth(your_tab_layout)
}
fun allotEachTabWithEqualWidth(tabLayout: TabLayout) {
mTabLayout.tabMode= TabLayout.MODE_FIXED
val slidingTabStrip = tabLayout.getChildAt(0) as ViewGroup
for (i in 0 until tabLayout.getTabCount()) {
val tab = slidingTabStrip.getChildAt(i)
val layoutParams = tab.layoutParams as LinearLayout.LayoutParams
layoutParams.weight = 1f
tab.layoutParams = layoutParams
}
}
来源：https://stackoverflow.com/questions/30843775/tab-not-taking-full-width-on-tablet-device-using-android-support-design-widget