1. 程式人生 > >通過修改指示器的間距來改變TabLayout指示器的寬度

通過修改指示器的間距來改變TabLayout指示器的寬度

1.寫個工具類 封裝:

import android.content.res.Resources;
import android.support.design.widget.TabLayout;
import android.util.TypedValue;
import android.view.View;
import android.widget.LinearLayout;

import java.lang.reflect.Field;

/**
 * Created by Sy on 2017/05/08.
 * 
 */

public class TabUtils {
    /**
* @param tabs TabLayout * @param leftDip marginLeft * @param rightDip marginRight */ public static void setIndicator (TabLayout tabs, int leftDip, int rightDip){ Class<?> tabLayout = tabs.getClass(); Field tabStrip = null; try { tabStrip = tabLayout.getDeclaredField("mTabStrip"
); } catch (NoSuchFieldException e) { e.printStackTrace(); return; } tabStrip.setAccessible(true); LinearLayout llTab = null; try { llTab = (LinearLayout) tabStrip.get(tabs); } catch (IllegalAccessException e) { e.printStackTrace();
         return;
        }

        int left = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, leftDip, Resources.getSystem().getDisplayMetrics());
        int right = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, rightDip, Resources.getSystem().getDisplayMetrics());

        for (int i = 0; i < llTab.getChildCount(); i++) {
            View child = llTab.getChildAt(i);
            child.setPadding(0, 0, 0, 0);
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1);
            params.leftMargin = left;
            params.rightMargin = right;
            child.setLayoutParams(params);
            child.invalidate();
        }
    }
}


2.在Activity呼叫

tab_view.post(new Runnable() {
    @Override
    public void run() {
        TabUtils.setIndicator(tab_view,10,10);
    }
});
3,此方法是通過反射獲取tablayout私有屬性進修改屬性值,如果app啟動混淆 會報NoSuchFieldException;

解決方案:在proguard-rules.pro混淆檔案中新增-keep class android.support.design.widget.TabLayout{*;}