我正在使用带有" Tabbed Activity"的ViewPager。由Android Studio生成。
当我运行应用程序时,正确的布局会加载到正确的片段中,您可以轻松地在片段之间滑动。布局是正确的,所有背景颜色都设置得如此。
不幸的是,只要您滑入另一个片段,所有Layouts
(ViewGroups
)都会失去背景颜色,这意味着它们会变得透明。里面的观点看起来仍然一样。
示例:底部的EditText位于LinearLayout内部,应该是白色(左图)但是变为灰色(右图)。
两个屏幕截图:1)加载时和2)刷卡后
最奇怪的是,如果你滑入一个片段而它失去了背景,如果向左或向右滑动一下,一切都会恢复正常,而不会更改标签。
可能是什么问题?
public class PageAdapter extends FragmentPagerAdapter {
public PageAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PageFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 4 total pages.
return 4;
}
@Override
public CharSequence getPageTitle(int position) {
return "POS: " + position;
}
}
public class PageFragment extends Fragment {
private static final String WHICH = "WHICH";
/**
* The fragment argument representing the section number for this
* fragment.
*/
public PageFragment() {}
public static PageFragment newInstance(int which){
PageFragment page = new PageFragment();
Bundle args = new Bundle();
args.putInt(WHICH, which);
page.setArguments(args);
return page;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView;
switch(getArguments().getInt(WHICH)){
case 1:
rootView = inflater.inflate(R.layout.activity_one, container, false);
break;
case 2:
rootView = inflater.inflate(R.layout.activity_two, container, false);
break;
case 3:
rootView = inflater.inflate(R.layout.activity_four, container, false);
break;
case 4:
rootView = inflater.inflate(R.layout.activity_five, container, false);
break;
default:
rootView = inflater.inflate(R.layout.activity_defautlt, container, false);
break;
}
return rootView;
}
}
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/layout_id"
android:layout_alignParentBottom="true"
android:orientation="horizontal"
android:layout_alignParentLeft="true"
android:background="@color/white"
android:gravity="center"
android:weightSum="1">
<EditText
android:layout_width="0dp"
android:layout_weight=".85"
android:layout_height="match_parent"
android:textColor="@color/grey_2"
style="@style/inputDefault"
android:minLines="1"
android:maxLines="5"
android:gravity="start|center"
android:paddingStart="@dimen/activity_horizontal_margin_medium"
android:paddingEnd="@dimen/activity_horizontal_margin_medium"
android:inputType="textMultiLine"
android:hint="@string/write_message"
android:id="@+id/chatroom_editText" />
<ImageButton
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".15"
android:src="@drawable/ic_send_black_24dp"
style="@style/btnImage"
android:id="@+id/chatroom_send_btn"
android:onClick="sendItem"
android:background="@color/white"
android:layout_margin="0dp"
android:padding="0dp"
/>
</LinearLayout>
<style name="inputDefault">
<item name="android:layout_marginRight">0dp</item>
<item name="android:layout_marginLeft">0dp</item>
<item name="android:layout_marginTop">@dimen/activity_vertical_margin_small</item>
<item name="android:layout_marginBottom">@dimen/activity_vertical_margin_small</item>
<item name="android:paddingTop">@dimen/activity_vertical_margin_small</item>
<item name="android:paddingBottom">@dimen/activity_vertical_margin_small</item>
<item name="android:background">@color/white</item>
<item name="android:textColor">@color/grey_2</item>
<item name="android:textColorHint">@color/grey_3</item>
<item name="android:textStyle">normal</item>
<item name="android:textCursorDrawable">@null</item>
<item name="android:stateListAnimator" tools:targetApi="lollipop">@null</item>
</style>
答案 0 :(得分:1)
实际上它与您的LinearLayout
或TabActivity
等无关。这是EditText的常见行为。
如果您希望EditText
背景透明或在您的情况下为白色,则无需定义android:background="@color/white"
只需将背景设为@null,其余部分就可以了。