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Android ShapeableImageView使用详解,告别shape、三方库

作者:互联网

app:strokeColor="@color/red"

app:strokeWidth=“4dp” />

叶子

在这里插入图片描述

<com.google.a

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ndroid.material.imageview.ShapeableImageView

android:layout_width=“wrap_content”

android:layout_height=“wrap_content”

android:layout_margin=“10dp”

android:padding=“2dp”

android:src="@mipmap/ic_avatar"

app:shapeAppearance="@style/LeafStyle"

app:strokeColor="@color/red"

app:strokeWidth=“4dp” />

半圆

在这里插入图片描述

<com.google.android.material.imageview.ShapeableImageView

android:layout_width=“wrap_content”

android:layout_height=“wrap_content”

android:layout_margin=“10dp”

android:padding=“2dp”

android:src="@mipmap/ic_avatar"

app:shapeAppearance="@style/SemicircleStyle"

app:strokeColor="@color/red"

app:strokeWidth=“4dp” />

六边形

在这里插入图片描述

<com.google.android.material.imageview.ShapeableImageView

android:layout_width=“wrap_content”

android:layout_height=“50dp”

android:layout_margin=“10dp”

android:padding=“2dp”

android:scaleType=“centerCrop”

android:src="@mipmap/ic_avatar"

app:shapeAppearance="@style/HexagonStyle"

app:strokeColor="@color/red"

app:strokeWidth=“4dp” />

author:yechaoa

属性

=============================================================

关于xml属性,我也做了一个整理,属性不多,只有4个

| 属性 | 描述 |

| — | — |

| strokeWidth | 描边宽度 |

| strokeColor | 描边颜色 |

| shapeAppearance | 外观样式 |

| shapeAppearanceOverlay | 同上,叠加层 |

扩展

=============================================================

前面为了整体的排版,埋了几个伏笔,下面来一一解答。

会涉及到源码,但是经过去繁从简,看起来也非常轻松的。

shapeAppearance

Shape appearance overlay style reference for ShapeableImageView.

ShapeableImageView的形状外观覆盖样式参考。

前面可以看到我们设置圆角其实是用的style,那为什么不直接用attrs呢,不是更加直观方便吗,带着疑问来看看源码是怎么处理的。

直接看ShapeableImageView的次构造方法:

public class ShapeableImageView extends AppCompatImageView implements Shapeable {

public ShapeableImageView(Context context, @Nullable AttributeSet attrs, int defStyle) {

super(wrap(context, attrs, defStyle, DEF_STYLE_RES), attrs, defStyle);

// Ensure we are using the correctly themed context rather than the context that was passed in.

context = getContext();

clearPaint = new Paint();

clearPaint.setAntiAlias(true);

clearPaint.setColor(Color.WHITE);

clearPaint.setXfermode(new PorterDuffXfermode(Mode.DST_OUT));

destination = new RectF();

maskRect = new RectF();

maskPath = new Path();

TypedArray attributes =

context.obtainStyledAttributes(

attrs, R.styleable.ShapeableImageView, defStyle, DEF_STYLE_RES);

strokeColor =

MaterialResources.getColorStateList(

context, attributes, R.styleable.ShapeableImageView_strokeColor);

strokeWidth = attributes.getDimensionPixelSize(R.styleable.ShapeableImageView_strokeWidth, 0);

borderPaint = new Paint();

borderPaint.setStyle(Style.STROKE);

borderPaint.setAntiAlias(true);

shapeAppearanceModel =

ShapeAppearanceModel.builder(context, attrs, defStyle, DEF_STYLE_RES).build();

shadowDrawable = new MaterialShapeDrawable(shapeAppearanceModel);

if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {

setOutlineProvider(new OutlineProvider());

}

}

}

常规操作,获取自定义属性。

关键的两行代码:

shapeAppearanceModel = ShapeAppearanceModel.builder(context, attrs, defStyle, DEF_STYLE_RES).build();

shadowDrawable = new MaterialShapeDrawable(shapeAppearanceModel);

也就是说我们给shapeAppearance设置的style,并不是ShapeableImageView自己来处理的,而是由ShapeAppearanceModel来构建的,然后又交给MaterialShapeDrawable来绘制的。

ShapeAppearanceModel

这个类就厉害了,有点像Flutter中的Decoration,可以构建出花里胡哨的效果。

来看ShapeAppearanceModel部分源码:

public class ShapeAppearanceModel {

/** Builder to create instances of {@link ShapeAppearanceModel}s. */

public static final class Builder {

@NonNull

private CornerTreatment topLeftCorner = MaterialShapeUtils.createDefaultCornerTreatment();

@NonNull

private CornerTreatment topRightCorner = MaterialShapeUtils.createDefaultCornerTreatment();

@NonNull

private CornerTreatment bottomRightCorner = MaterialShapeUtils.createDefaultCornerTreatment();

@NonNull

private CornerTreatment bottomLeftCorner = MaterialShapeUtils.createDefaultCornerTreatment();

@NonNull private CornerSize topLeftCornerSize = new AbsoluteCornerSize(0);

@NonNull private CornerSize topRightCornerSize = new AbsoluteCornerSize(0);

@NonNull private CornerSize bottomRightCornerSize = new AbsoluteCornerSize(0);

@NonNull private CornerSize bottomLeftCornerSize = new AbsoluteCornerSize(0);

@NonNull private EdgeTreatment topEdge = MaterialShapeUtils.createDefaultEdgeTreatment();

@NonNull private EdgeTreatment rightEdge = MaterialShapeUtils.createDefaultEdgeTreatment();

@NonNull private EdgeTreatment bottomEdge = MaterialShapeUtils.createDefaultEdgeTreatment();

@NonNull private EdgeTreatment leftEdge = MaterialShapeUtils.createDefaultEdgeTreatment();

public Builder() {}

}

}

可以看到有各种边和角的属性,这里注意两个点:

也就意味着,边和角除了默认,是可以自定义的,这就有极大的想象空间了,

比如这样:

在这里插入图片描述

// 代码设置 角和边

val shapeAppearanceModel2 = ShapeAppearanceModel.builder().apply {

setAllCorners(RoundedCornerTreatment())

setAllCornerSizes(50f)

setAllEdges(TriangleEdgeTreatment(50f, false))

}.build()

val drawable2 = MaterialShapeDrawable(shapeAppearanceModel2).apply {

setTint(ContextCompat.getColor(this@ShapeableImageViewActivity, R.color.colorPrimary))

paintStyle = Paint.Style.FILL_AND_STROKE

strokeWidth = 50f

strokeColor = ContextCompat.getColorStateList(this@ShapeableImageViewActivity, R.color.red)

}

mBinding.text2.setTextColor(Color.WHITE)

mBinding.text2.background = drawable2

再比如这样:

在这里插入图片描述

// 代码设置 聊天框效果

val shapeAppearanceModel3 = ShapeAppearanceModel.builder().apply {

setAllCorners(RoundedCornerTreatment())

setAllCornerSizes(20f)

setRightEdge(object : TriangleEdgeTreatment(20f, false) {

// center 位置 , interpolation 角的大小

override fun getEdgePath(length: Float, center: Float, interpolation: Float, shapePath: ShapePath) {

super.getEdgePath(length, 35f, interpolation, shapePath)

}

})

}.build()

val drawable3 = MaterialShapeDrawable(shapeAppearanceModel3).apply {

setTint(ContextCompat.getColor(this@ShapeableImageViewActivity, R.color.colorPrimary))

paintStyle = Paint.Style.FILL

}

(mBinding.text3.parent as ViewGroup).clipChildren = false // 不限制子view在其范围内

mBinding.text3.setTextColor(Color.WHITE)

mBinding.text3.background = drawable3

MaterialShapeDrawable

源码(有删减):

public class MaterialShapeDrawable extends Drawable implements TintAwareDrawable, Shapeable {

@Override

public void draw(@NonNull Canvas canvas) {

fillPaint.setColorFilter(tintFilter);

final int prevAlpha = fillPaint.getAlpha();

fillPaint.setAlpha(modulateAlpha(prevAlpha, drawableState.alpha));

strokePaint.setColorFilter(strokeTintFilter);

strokePaint.setStrokeWidth(drawableState.strokeWidth);

final int prevStrokeAlpha = strokePaint.getAlpha();

strokePaint.setAlpha(modulateAlpha(prevStrokeAlpha, drawableState.alpha));

if (pathDirty) {

calculateStrokePath();

calculatePath(getBoundsAsRectF(), path);

pathDirty = false;

}

maybeDrawCompatShadow(canvas);

if (hasFill()) {

drawFillShape(canvas);

}

if (hasStroke()) {

drawStrokeShape(canvas);

}

static final class MaterialShapeDrawableState extends ConstantState {

public MaterialShapeDrawableState(@NonNull MaterialShapeDrawableState orig) {

shapeAppearanceModel = orig.shapeAppearanceModel;

elevationOverlayProvider = orig.elevationOverlayProvider;

strokeWidth = orig.strokeWidth;

colorFilter = orig.colorFilter;

fillColor = orig.fillColor;

strokeColor = orig.strokeColor;

tintMode = orig.tintMode;

tintList = orig.tintList;

alpha = orig.alpha;

scale = orig.scale;

shadowCompatOffset = orig.shadowCompatOffset;

shadowCompatMode = orig.shadowCompatMode;

useTintColorForShadow = orig.useTintColorForShadow;

interpolation = orig.interpolation;

parentAbsoluteElevation = orig.parentAbsoluteElevation;

elevation = orig.elevation;

translationZ = orig.translationZ;

shadowCompatRadius = orig.shadowCompatRadius;

shadowCompatRotation = orig.shadowCompatRotation;

strokeTintList = orig.strokeTintList;

paintStyle = orig.paintStyle;

if (orig.padding != null) {

padding = new Rect(orig.padding);

}

}

}

}

没什么特别的,你只需要知道除了可以设置描边之外,还可以设置背景、阴影等其他属性。

说明

描边问题

这里借github一张图

在这里插入图片描述

又是自定义view的常规操作,有一半画笔是在边界外面的,所以需要设置paddingstrokeWidth的一半。

默认圆角问题

有细心的同学会发现啊,第一个常规的ShapeableImageView还是有一点圆角的,没错,属于默认的,跟踪一下源码来看一下:

第一个是颜色,很明显不是我们要找的,继续看shapeAppearanceMediumComponent

只是一个简单的属性,继续查找关联引用

@style/ShapeAppearance.MaterialComponents.MediumComponent

又引用了一个style,继续看ShapeAppearance.MaterialComponents.MediumComponent这个style

哦豁,看到了熟悉的属性cornerSize,藏的还挺深,继续看看数值是多少

4dp

默认4dp

那如果不想要这个圆角怎么办呢,可以学习源码仿写一个,不过上面也看到了,有点绕,不如直接写个style搞定:

标签:ShapeableImageView,NonNull,private,shape,strokeWidth,new,Android,android,orig
来源: https://blog.csdn.net/m0_64383081/article/details/121898988