标签条在设置背景颜色

Question

我做了一个标签视图，我想更改标签的背景颜色，但是当我在标签文本视图背景上设置颜色时，标签会消失。

SlidingTabLayout.java

    package com.towntrot.checkin;

import android.content.Context;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Build;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;          
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.HorizontalScrollView;
import android.widget.TextView;
import android.widget.Toast;

public class SlidingTabLayout extends HorizontalScrollView {

public interface TabColorizer {

    int getIndicatorColor(int position);

    int getDividerColor(int position);

}

private static final int TITLE_OFFSET_DIPS = 24;
private static final int TAB_VIEW_PADDING_DIPS = 16;
private static final int TAB_VIEW_TEXT_SIZE_SP = 12;

private int mTitleOffset;

private int mTabViewLayoutId;
private int mTabViewTextViewId;

private ViewPager mViewPager;
private ViewPager.OnPageChangeListener mViewPagerPageChangeListener;

private final SlidingTabStrip mTabStrip;

public SlidingTabLayout(Context context) {
    this(context, null);
}

public SlidingTabLayout(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
}

public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);

    setHorizontalScrollBarEnabled(false);
    setFillViewport(true);

    mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density);

    mTabStrip = new SlidingTabStrip(context);
    addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
}

public void setViewPager(ViewPager viewPager) {
    mTabStrip.removeAllViews();

    mViewPager = viewPager;
    if (viewPager != null) {
        viewPager.setOnPageChangeListener(new InternalViewPagerListener());
        populateTabStrip();
    }
}

protected TextView createDefaultTabView(Context context) {
    TextView textView = new TextView(context);
    textView.setGravity(Gravity.CENTER);
    textView.setTextColor(getResources().getColor(android.R.color.white));
    textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, TAB_VIEW_TEXT_SIZE_SP);
    textView.setTypeface(Typeface.DEFAULT_BOLD);
    textView.setBackgroundColor(getResources().getColor(android.R.color.holo_orange_dark));

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        TypedValue outValue = new TypedValue();
        getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground,
                outValue, true);
    }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        // If we're running on ICS or newer, enable all-caps to match the Action Bar tab style
        textView.setAllCaps(true);
    }

    int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density);
    textView.setPadding(padding, padding, padding, padding);

    return textView;
}

private void populateTabStrip() {
    final PagerAdapter adapter = mViewPager.getAdapter();
    final View.OnClickListener tabClickListener = new TabClickListener();

    for (int i = 0; i < adapter.getCount(); i++) {
        View tabView = null;
        TextView tabTitleView = null;

        if (mTabViewLayoutId != 0) {
            // If there is a custom tab view layout id set, try and inflate it
            tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip,
                    false);
            tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId);
        }

        if (tabView == null) {
            tabView = createDefaultTabView(getContext());
        }

        if (tabTitleView == null && TextView.class.isInstance(tabView)) {
            tabTitleView = (TextView) tabView;
        }

        tabTitleView.setText(adapter.getPageTitle(i));
        tabView.setOnClickListener(tabClickListener);

        mTabStrip.addView(tabView);
    }
}

@Override
protected void onAttachedToWindow() {
    super.onAttachedToWindow();

    if (mViewPager != null) {
        scrollToTab(mViewPager.getCurrentItem(), 0);
    }
}

private void scrollToTab(int tabIndex, int positionOffset) {
    final int tabStripChildCount = mTabStrip.getChildCount();
    if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) {
        return;
    }

    View selectedChild = mTabStrip.getChildAt(tabIndex);
    if (selectedChild != null) {
        int targetScrollX = selectedChild.getLeft() + positionOffset;

        if (tabIndex > 0 || positionOffset > 0) {
            // If we're not at the first child and are mid-scroll, make sure we obey the offset
            targetScrollX -= mTitleOffset;
        }

        scrollTo(targetScrollX, 0);
    }
}

private class InternalViewPagerListener implements ViewPager.OnPageChangeListener {
    private int mScrollState;

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        int tabStripChildCount = mTabStrip.getChildCount();
        if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
            return;
        }

        mTabStrip.onViewPagerPageChanged(position, positionOffset);

        View selectedTitle = mTabStrip.getChildAt(position);
        int extraOffset = (selectedTitle != null)
                ? (int) (positionOffset * selectedTitle.getWidth())
                : 0;
        scrollToTab(position, extraOffset);

        if (mViewPagerPageChangeListener != null) {
            mViewPagerPageChangeListener.onPageScrolled(position, positionOffset,
                    positionOffsetPixels);
        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {
        mScrollState = state;

        if (mViewPagerPageChangeListener != null) {
            mViewPagerPageChangeListener.onPageScrollStateChanged(state);
        }
    }

    @Override
    public void onPageSelected(int position) {
        if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
            mTabStrip.onViewPagerPageChanged(position, 0f);
            scrollToTab(position, 0);
        }

        if (mViewPagerPageChangeListener != null) {
            mViewPagerPageChangeListener.onPageSelected(position);
        }
    }

}

private class TabClickListener implements View.OnClickListener {
    @Override
    public void onClick(View v) {
        for (int i = 0; i < mTabStrip.getChildCount(); i++) {
            if (v == mTabStrip.getChildAt(i)) {
                mViewPager.setCurrentItem(i);
                return;
            }
        }
    }
}

}

SlidingTabStrip.java

    package com.towntrot.checkin;

import android.R;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import android.widget.LinearLayout;

class SlidingTabStrip extends LinearLayout {

private static final int DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS = 2;
private static final byte DEFAULT_BOTTOM_BORDER_COLOR_ALPHA = 0x26;
private static final int SELECTED_INDICATOR_THICKNESS_DIPS = 4;
private static final int DEFAULT_SELECTED_INDICATOR_COLOR = 0xffee7600;

private static final int DEFAULT_DIVIDER_THICKNESS_DIPS = 1;
private static final byte DEFAULT_DIVIDER_COLOR_ALPHA = 0x20;
private static final float DEFAULT_DIVIDER_HEIGHT = 0.5f;

private final int mBottomBorderThickness;
private final Paint mBottomBorderPaint;

private final int mSelectedIndicatorThickness;
private final Paint mSelectedIndicatorPaint;

private final int mDefaultBottomBorderColor;

private final Paint mDividerPaint;
private final float mDividerHeight;

private int mSelectedPosition;
private float mSelectionOffset;

private SlidingTabLayout.TabColorizer mCustomTabColorizer;
private final SimpleTabColorizer mDefaultTabColorizer;

SlidingTabStrip(Context context) {
    this(context, null);
}

SlidingTabStrip(Context context, AttributeSet attrs) {
    super(context, attrs);
    setWillNotDraw(false);

    final float density = getResources().getDisplayMetrics().density;

    TypedValue outValue = new TypedValue();
    context.getTheme().resolveAttribute(R.attr.colorForeground, outValue, true);
    final int themeForegroundColor =  getResources().getColor(android.R.color.holo_orange_dark);

    mDefaultBottomBorderColor = setColorAlpha(themeForegroundColor,
            DEFAULT_BOTTOM_BORDER_COLOR_ALPHA);

    mDefaultTabColorizer = new SimpleTabColorizer();
    mDefaultTabColorizer.setIndicatorColors(DEFAULT_SELECTED_INDICATOR_COLOR);
    mDefaultTabColorizer.setDividerColors(setColorAlpha(themeForegroundColor,
            DEFAULT_DIVIDER_COLOR_ALPHA));

    mBottomBorderThickness = (int) (DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS * density);
    mBottomBorderPaint = new Paint();
    mBottomBorderPaint.setColor(mDefaultBottomBorderColor);

    mSelectedIndicatorThickness = (int) (SELECTED_INDICATOR_THICKNESS_DIPS * density);
    mSelectedIndicatorPaint = new Paint();

    mDividerHeight = DEFAULT_DIVIDER_HEIGHT;
    mDividerPaint = new Paint();
    mDividerPaint.setStrokeWidth((int) (DEFAULT_DIVIDER_THICKNESS_DIPS * density));
}

void onViewPagerPageChanged(int position, float positionOffset) {
    mSelectedPosition = position;
    mSelectionOffset = positionOffset;
    invalidate();
}

@Override
protected void onDraw(Canvas canvas) {
    final int height = getHeight();
    final int childCount = getChildCount();
    final int dividerHeightPx =0;
    final SlidingTabLayout.TabColorizer tabColorizer = mCustomTabColorizer != null
            ? mCustomTabColorizer
            : mDefaultTabColorizer;

    // Thick colored underline below the current selection
    if (childCount > 0) {
        View selectedTitle = getChildAt(mSelectedPosition);
        int left = selectedTitle.getLeft();
        int right = selectedTitle.getRight();
        int color = tabColorizer.getIndicatorColor(mSelectedPosition);

        if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {
            int nextColor = tabColorizer.getIndicatorColor(mSelectedPosition + 1);
            if (color != nextColor) {
                color = blendColors(nextColor, color, mSelectionOffset);
            }

            // Draw the selection partway between the tabs
            View nextTitle = getChildAt(mSelectedPosition + 1);
            left = (int) (mSelectionOffset * nextTitle.getLeft() +
                    (1.0f - mSelectionOffset) * left);
            right = (int) (mSelectionOffset * nextTitle.getRight() +
                    (1.0f - mSelectionOffset) * right);
        }

        mSelectedIndicatorPaint.setColor(color);

        canvas.drawRect(left, height - mSelectedIndicatorThickness, right,
                height, mSelectedIndicatorPaint);
    }

    // Thin underline along the entire bottom edge
    canvas.drawRect(0, height - mBottomBorderThickness, getWidth(), height, mBottomBorderPaint);

    // Vertical separators between the titles
    int separatorTop = (height - dividerHeightPx) / 2;
    for (int i = 0; i < childCount - 1; i++) {
        View child = getChildAt(i);
        mDividerPaint.setColor(tabColorizer.getDividerColor(i));
        canvas.drawLine(child.getRight(), separatorTop, child.getRight(),
                separatorTop + dividerHeightPx, mDividerPaint);
    }
}

private static int setColorAlpha(int color, byte alpha) {
    return Color.argb(alpha, Color.red(color), Color.green(color), Color.blue(color));
}

private static int blendColors(int color1, int color2, float ratio) {
    final float inverseRation = 1f - ratio;
    float r = (Color.red(color1) * ratio) + (Color.red(color2) * inverseRation);
    float g = (Color.green(color1) * ratio) + (Color.green(color2) * inverseRation);
    float b = (Color.blue(color1) * ratio) + (Color.blue(color2) * inverseRation);
    return Color.rgb((int) r, (int) g, (int) b);
}

private static class SimpleTabColorizer implements SlidingTabLayout.TabColorizer {
    private int[] mIndicatorColors;
    private int[] mDividerColors;

    @Override
    public final int getIndicatorColor(int position) {
        return mIndicatorColors[position % mIndicatorColors.length];
    }
        @Override
    public final int getDividerColor(int position) {
        return mDividerColors[position % mDividerColors.length];
    }

    void setIndicatorColors(int... colors) {
        mIndicatorColors = colors;
    }

    void setDividerColors(int... colors) {
        mDividerColors = colors;
    }
}

}

在createDefaultTabView中我添加了：

textView.setBackgroundColor（getResources（）的getColor（android.R.color.holo_orange_dark））;

我是android新手，感谢任何帮助，谢谢。

Answer 1

当您设置textview的背景时，它会覆盖您的SlidingTabStrip布局（选项卡容器），它位于视图层次结构的下方，因此底部条带由TextView背景覆盖。

要更改所有标签的背景颜色，您应该向SlidingTabStrip.onDraw方法添加背景图。要更改所有标签的背景，您可以例如使用canvas.drawColor(int color)方法

填充整个标签容器

@Override
protected void onDraw(Canvas canvas) {
    final int height = getHeight();
    final int childCount = getChildCount();
    final int dividerHeightPx =0;
    final SlidingTabLayout.TabColorizer tabColorizer = mCustomTabColorizer != null
            ? mCustomTabColorizer
            : mDefaultTabColorizer;

   canvas.drawColor(getResources().getColor(android.R.color.holo_orange_dark));

    // Thick colored underline below the current selection
    if (childCount > 0) {
        View selectedTitle = getChildAt(mSelectedPosition);
        int left = selectedTitle.getLeft();
        int right = selectedTitle.getRight();
        int color = tabColorizer.getIndicatorColor(mSelectedPosition);

        if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {
            int nextColor = tabColorizer.getIndicatorColor(mSelectedPosition + 1);
            if (color != nextColor) {
                color = blendColors(nextColor, color, mSelectionOffset);
            }

            // Draw the selection partway between the tabs
            View nextTitle = getChildAt(mSelectedPosition + 1);
            left = (int) (mSelectionOffset * nextTitle.getLeft() +
                    (1.0f - mSelectionOffset) * left);
            right = (int) (mSelectionOffset * nextTitle.getRight() +
                    (1.0f - mSelectionOffset) * right);
        }

        mSelectedIndicatorPaint.setColor(color);

        canvas.drawRect(left, height - mSelectedIndicatorThickness, right,
                height, mSelectedIndicatorPaint);
    }

    // Thin underline along the entire bottom edge
    canvas.drawRect(0, height - mBottomBorderThickness, getWidth(), height, mBottomBorderPaint);

    // Vertical separators between the titles
    int separatorTop = (height - dividerHeightPx) / 2;
    for (int i = 0; i < childCount - 1; i++) {
        View child = getChildAt(i);
        mDividerPaint.setColor(tabColorizer.getDividerColor(i));
        canvas.drawLine(child.getRight(), separatorTop, child.getRight(),
                separatorTop + dividerHeightPx, mDividerPaint);
    }
}