Android 当我使用渐变依赖项时，如何重写函数？

我在我的项目中使用range seek bar（）控件，我希望格式化android range seek bar的所选最小值和最大值的标签。 我浏览源代码，我想我应该更改RangeSeekBar.java中函数

onDraw

中的代码。我该怎么做

顺便说一句，我不希望创建一个新的基于项目的范围搜索栏和修改代码

UI

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:rsb="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/border_ui">


    <LinearLayout
        android:id="@+id/linearLayoutToolBar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        style="@style/myToolbar"
        android:weightSum="4" >

        <Button
            android:id="@+id/btnCrop"
            style="@style/myTextMedium"
            android:layout_width="0dip"
            android:layout_height="fill_parent"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:text="@string/BtnCrop" />

    </LinearLayout>

    <LinearLayout
        android:id="@+id/LinerSeekBar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/linearLayoutToolBar"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingBottom="14dp"
        android:paddingTop="1dp"
        android:layout_centerHorizontal="true"
        android:orientation="vertical">

           <org.florescu.android.rangeseekbar.RangeSeekBar
            android:id="@+id/myRangeSeekBar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            rsb:absoluteMaxValue="10000"
            rsb:absoluteMinValue="0"
            rsb:activateOnDefaultValues="true"
            rsb:showLabels="true"
            rsb:valuesAboveThumbs="false"
            rsb:textAboveThumbsColor="@color/black" />

    </LinearLayout>


    <TextureView
        android:id="@+id/mTextureView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"

        android:layout_marginBottom="5dp"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"

        android:layout_above="@+id/LinerSeekBar"
        android:layout_centerHorizontal="true"
     />


</RelativeLayout>

RangeSeekBar.java

/**
     * Draws the widget on the given canvas.
     */
    @Override
    protected synchronized void onDraw(@NonNull Canvas canvas) {
        super.onDraw(canvas);

        paint.setTextSize(mTextSize);
        paint.setStyle(Style.FILL);
        paint.setColor(mDefaultColor);
        paint.setAntiAlias(true);
        float minMaxLabelSize = 0;

        if (mShowLabels) {
            // draw min and max labels
            String minLabel = getContext().getString(R.string.demo_min_label);
            String maxLabel = getContext().getString(R.string.demo_max_label);
            minMaxLabelSize = Math.max(paint.measureText(minLabel), paint.measureText(maxLabel));
            float minMaxHeight = mTextOffset + mThumbHalfHeight + mTextSize / 3;
            canvas.drawText(minLabel, 0, minMaxHeight, paint);
            canvas.drawText(maxLabel, getWidth() - minMaxLabelSize, minMaxHeight, paint);
        }
        padding = mInternalPad + minMaxLabelSize + mThumbHalfWidth;

        // draw seek bar background line
        mRect.left = padding;
        mRect.right = getWidth() - padding;
        canvas.drawRect(mRect, paint);

        boolean selectedValuesAreDefault = (getSelectedMinValue().equals(getAbsoluteMinValue()) &&
                getSelectedMaxValue().equals(getAbsoluteMaxValue()));

        int colorToUseForButtonsAndHighlightedLine = !mAlwaysActive && !mActivateOnDefaultValues && selectedValuesAreDefault ?
                mDefaultColor : // default values
                mActiveColor;   // non default, filter is active

        // draw seek bar active range line
        mRect.left = normalizedToScreen(normalizedMinValue);
        mRect.right = normalizedToScreen(normalizedMaxValue);

        paint.setColor(colorToUseForButtonsAndHighlightedLine);
        canvas.drawRect(mRect, paint);

        // draw minimum thumb (& shadow if requested) if not a single thumb control
        if (!mSingleThumb) {
            if (mThumbShadow) {
                drawThumbShadow(normalizedToScreen(normalizedMinValue), canvas);
            }
            drawThumb(normalizedToScreen(normalizedMinValue), Thumb.MIN.equals(pressedThumb), canvas,
                    selectedValuesAreDefault);
        }

        // draw maximum thumb & shadow (if necessary)
        if (mThumbShadow) {
            drawThumbShadow(normalizedToScreen(normalizedMaxValue), canvas);
        }
        drawThumb(normalizedToScreen(normalizedMaxValue), Thumb.MAX.equals(pressedThumb), canvas,
                selectedValuesAreDefault);

        // draw the text if sliders have moved from default edges
        if (mShowTextAboveThumbs && (mActivateOnDefaultValues || !selectedValuesAreDefault)) {
            paint.setTextSize(mTextSize);
            paint.setColor(mTextAboveThumbsColor);
            // give text a bit more space here so it doesn't get cut off
            int offset = PixelUtil.dpToPx(getContext(), TEXT_LATERAL_PADDING_IN_DP);

            String minText = String.valueOf(getSelectedMinValue());
            String maxText = String.valueOf(getSelectedMaxValue());
            float minTextWidth = paint.measureText(minText) + offset;
            float maxTextWidth = paint.measureText(maxText) + offset;

            if (!mSingleThumb) {
                canvas.drawText(minText,
                        normalizedToScreen(normalizedMinValue) - minTextWidth * 0.5f,
                        mDistanceToTop + mTextSize,
                        paint);

            }

            canvas.drawText(maxText,
                    normalizedToScreen(normalizedMaxValue) - maxTextWidth * 0.5f,
                    mDistanceToTop + mTextSize,
                    paint);
        }

    }

---

您可以创建一个MyRangeSekbar类，该类扩展RangeSekbar并用代码覆盖onDraw

我找到了解决方案。下载“android range seek bar”的源代码，然后使用android Studio打开它。现在您可以编辑代码了。完成编辑后，释放项目。并在“rangeseekbar/build/outputs/aar”文件夹中获取“.aar”文件。打开您的模块设置，单击添加模块，选择“导入.JAR/.AAR包”。导入刚生成的.aar文件。

谢谢！我是否需要修改UI xml文件并编译'org.florescu.android.RangeSekbar:RangeSekbar library:0.3.0'仅xml文件-然后必须指向您的SeekBar（MyRangeSekbar）谢谢！我尝试创建一个扩展RangeSekbar的类MyRangeSekbar，但没有成功，因为RangeSekbar类中有许多私有变量，我无法在新类MyRangeSekbari中的onDraw函数中执行任何操作。如果是这种情况，您将不得不分叉该项目或复制RangeSekbar的代码，并在项目中包含modified

/**
     * Draws the widget on the given canvas.
     */
    @Override
    protected synchronized void onDraw(@NonNull Canvas canvas) {
        super.onDraw(canvas);

        paint.setTextSize(mTextSize);
        paint.setStyle(Style.FILL);
        paint.setColor(mDefaultColor);
        paint.setAntiAlias(true);
        float minMaxLabelSize = 0;

        if (mShowLabels) {
            // draw min and max labels
            String minLabel = getContext().getString(R.string.demo_min_label);
            String maxLabel = getContext().getString(R.string.demo_max_label);
            minMaxLabelSize = Math.max(paint.measureText(minLabel), paint.measureText(maxLabel));
            float minMaxHeight = mTextOffset + mThumbHalfHeight + mTextSize / 3;
            canvas.drawText(minLabel, 0, minMaxHeight, paint);
            canvas.drawText(maxLabel, getWidth() - minMaxLabelSize, minMaxHeight, paint);
        }
        padding = mInternalPad + minMaxLabelSize + mThumbHalfWidth;

        // draw seek bar background line
        mRect.left = padding;
        mRect.right = getWidth() - padding;
        canvas.drawRect(mRect, paint);

        boolean selectedValuesAreDefault = (getSelectedMinValue().equals(getAbsoluteMinValue()) &&
                getSelectedMaxValue().equals(getAbsoluteMaxValue()));

        int colorToUseForButtonsAndHighlightedLine = !mAlwaysActive && !mActivateOnDefaultValues && selectedValuesAreDefault ?
                mDefaultColor : // default values
                mActiveColor;   // non default, filter is active

        // draw seek bar active range line
        mRect.left = normalizedToScreen(normalizedMinValue);
        mRect.right = normalizedToScreen(normalizedMaxValue);

        paint.setColor(colorToUseForButtonsAndHighlightedLine);
        canvas.drawRect(mRect, paint);

        // draw minimum thumb (& shadow if requested) if not a single thumb control
        if (!mSingleThumb) {
            if (mThumbShadow) {
                drawThumbShadow(normalizedToScreen(normalizedMinValue), canvas);
            }
            drawThumb(normalizedToScreen(normalizedMinValue), Thumb.MIN.equals(pressedThumb), canvas,
                    selectedValuesAreDefault);
        }

        // draw maximum thumb & shadow (if necessary)
        if (mThumbShadow) {
            drawThumbShadow(normalizedToScreen(normalizedMaxValue), canvas);
        }
        drawThumb(normalizedToScreen(normalizedMaxValue), Thumb.MAX.equals(pressedThumb), canvas,
                selectedValuesAreDefault);

        // draw the text if sliders have moved from default edges
        if (mShowTextAboveThumbs && (mActivateOnDefaultValues || !selectedValuesAreDefault)) {
            paint.setTextSize(mTextSize);
            paint.setColor(mTextAboveThumbsColor);
            // give text a bit more space here so it doesn't get cut off
            int offset = PixelUtil.dpToPx(getContext(), TEXT_LATERAL_PADDING_IN_DP);

            String minText = String.valueOf(getSelectedMinValue());
            String maxText = String.valueOf(getSelectedMaxValue());
            float minTextWidth = paint.measureText(minText) + offset;
            float maxTextWidth = paint.measureText(maxText) + offset;

            if (!mSingleThumb) {
                canvas.drawText(minText,
                        normalizedToScreen(normalizedMinValue) - minTextWidth * 0.5f,
                        mDistanceToTop + mTextSize,
                        paint);

            }

            canvas.drawText(maxText,
                    normalizedToScreen(normalizedMaxValue) - maxTextWidth * 0.5f,
                    mDistanceToTop + mTextSize,
                    paint);
        }

    }