2015/8/27 추기

하고 싶은 일

문제.

TabLayout의 표시기 색상 설정 방법

<android.support.design.widget.TabLayout
        android:id="@+id/sliding_tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabIndicatorColor="@color/hoge_color" />

해결책

mTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                switch (tab.getPosition()) {
                    case 0:
                        mTabLayout.setSelectedTabIndicatorColor(getResources().getColor(R.color.blue));
                        break;
                    case 1:
                        mTabLayout.setSelectedTabIndicatorColor(getResources().getColor(R.color.red));
                        break;
                    case 2:
                        mTabLayout.setSelectedTabIndicatorColor(getResources().getColor(R.color.green));
                        break;
                    default:
                        break;
                }
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

소스 코드의 제한 사항

public TabLayout(Context context, AttributeSet attrs, int defStyleAttr) {
//----略-----
        this.mTabStrip = new TabLayout.SlidingTabStrip(context);        
     this.mTabStrip.setSelectedIndicatorColor(a.getColor(styleable.TabLayout_tabIndicatorColor, 0));
//----略-----

해결

초경성

mTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                if (tab.getPosition() == 0) {
                    changeTabIndicatorColor(getResources().getColor(R.color.transaction_out_color));
                } else if (tab.getPosition() == 1) {
                    changeTabIndicatorColor(getResources().getColor(R.color.transaction_in_color));
                } else if (tab.getPosition() == 2) {
                    changeTabIndicatorColor(getResources().getColor(R.color.transaction_ex_color));
                }

                viewPager.setCurrentItem(tab.getPosition(), false); // タブ内のページも切り替えないといけない。
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

private void changeTabIndicatorColor(int colorIdInHex) {
        try {
            Field field = TabLayout.class.getDeclaredField("mTabStrip");
            field.setAccessible(true);
            Object ob = field.get(mTabLayout);
            Class<?> c = Class.forName("android.support.design.widget.TabLayout$SlidingTabStrip");
            Method method = c.getDeclaredMethod("setSelectedIndicatorColor", int.class);
            method.setAccessible(true);
            method.invoke(ob, colorIdInHex);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

인용하다