view设置圆角 android,Android 设置圆角View

最新推荐文章于 2025-03-07 23:03:14 发布

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最新推荐文章于 2025-03-07 23:03:14 发布

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文章标签： view设置圆角 android

本文介绍了如何在Android中为View设置圆角，包括通用的方法ViewHelper以及针对FrameLayout和LinearLayout的扩展CornerFrameLayout和CornerLinearLayout，通过ViewOutlineProvider实现圆角效果，并提供了详细的代码示例。

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核心ViewHelper，使用ViewOutlineProvider实现圆角

ViewHelper.java

import android.annotation.TargetApi;

import android.content.res.TypedArray;

import android.graphics.Outline;

import android.util.AttributeSet;

import android.view.View;

import android.view.ViewOutlineProvider;

public class ViewHelper {

public static final int RADIUS_ALL = 0;

public static final int RADIUS_LEFT = 1;

public static final int RADIUS_TOP = 2;

public static final int RADIUS_RIGHT = 3;

public static final int RADIUS_BOTTOM = 4;

public static void setViewOutline(View view, AttributeSet attributes, int defStyleAttr, int defStyleRes) {

TypedArray array = view.getContext().obtainStyledAttributes(attributes, R.styleable.viewOutLineStrategy, defStyleAttr, defStyleRes);

int radius = array.getDimensionPixelSize(R.styleable.viewOutLineStrategy_clip_radius, 0);

int hideSide = array.getInt(R.styleable.viewOutLineStrategy_clip_side, 0);

array.recycle();

setViewOutline(view, radius, hideSide);

}

public static void setViewOutline(View owner, final int radius, final int radiusSide) {

owner.setOutlineProvider(new ViewOutlineProvider() {

@Override

@TargetApi(21)

public void getOutline(View view, Outline outline) {

int w = view.getWidth(), h = view.getHeight();

if (w == 0 || h == 0) {

return;

}

if (radiusSide != RADIUS_ALL) {

int left = 0, top = 0, right = w, bottom = h;

if (radiusSide == RADIUS_LEFT) {

right += radius;

} else if (radiusSide == RADIUS_TOP) {

bottom += radius;

} else if (radiusSide == RADIUS_RIGHT) {

left -= radius;

} else if (radiusSide == RADIUS_BOTTOM) {

top -= radius;

}

outline.setRoundRect(left, top, right, bottom, radius);

return;

}

int top = 0, bottom = h, left = 0, right = w;

if (radius <= 0) {

outline.setRect(left, top, right, bottom);

} else {

outline.setRoundRect(left, top, right, bottom, radius);

}

});

//开启剪裁

owner.setClipToOutline(radius > 0);

owner.invalidate();

}

CornerFrameLayout

import android.content.Context;

import android.util.AttributeSet;

import android.widget.FrameLayout;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

public class CornerFrameLayout extends FrameLayout {

public CornerFrameLayout(@NonNull Context context) {

this(context, null);

}

public CornerFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs) {

this(context, attrs, 0);

}

public CornerFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

this(context, attrs, defStyleAttr, 0);

}

public CornerFrameLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {

super(context, attrs, defStyleAttr, defStyleRes);

ViewHelper.setViewOutline(this, attrs, defStyleAttr, defStyleRes);

}

public void setViewOutline(int radius, int radiusSide) {

ViewHelper.setViewOutline(this, radius, radiusSide);

}

CornerLinearLayout

import android.content.Context;

import android.util.AttributeSet;

import android.widget.LinearLayout;

import androidx.annotation.Nullable;

public class CornerLinearLayout extends LinearLayout {

public CornerLinearLayout(Context context) {

this(context, null);

}

public CornerLinearLayout(Context context, @Nullable AttributeSet attrs) {

this(context, attrs, 0);

}

public CornerLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

this(context, attrs, defStyleAttr, 0);

}

public CornerLinearLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {

super(context, attrs, defStyleAttr, defStyleRes);

ViewHelper.setViewOutline(this, attrs, defStyleAttr, defStyleRes);

}

来源：oschina

链接：https://my.oschina.net/u/4261498/blog/4314342