Question

我想在我的应用中使用圆形ImageView。我发现了一些代码，但这只是圆角图像而不是圆圈。这是我的代码。还要检查图像。

   public class CircularImageView extends android.support.v7.widget.AppCompatImageView {

public CircularImageView(Context context) {
    super(context);
}

public CircularImageView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

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

@Override
protected void onDraw(Canvas canvas) {

    Drawable drawable = getDrawable();

    if (drawable == null) {
        return;
    }

    if (getWidth() == 0 || getHeight() == 0) {
        return;
    }
    Bitmap b = ((BitmapDrawable) drawable).getBitmap();
    Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

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

    Bitmap roundBitmap = getRoundBitmap(bitmap, w);
    canvas.drawBitmap(roundBitmap, 0, 0, null);

}

public static Bitmap getRoundBitmap(Bitmap bmp, int radius) {
    Bitmap sBmp;

    if (bmp.getWidth() != radius || bmp.getHeight() != radius) {
        float smallest = Math.min(bmp.getWidth(), bmp.getHeight());
        float factor = smallest / radius;
        sBmp = Bitmap.createScaledBitmap(bmp, (int)(bmp.getWidth() / factor), (int)(bmp.getHeight() / factor), false);
    } else {
        sBmp = bmp;
    }

    Bitmap output = Bitmap.createBitmap(radius, radius,
            Bitmap.Config.ARGB_8888);


    Canvas canvas = new Canvas(output);

    final int color = 0xffa19774;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, radius, radius);

    paint.setAntiAlias(true);
    paint.setFilterBitmap(true);
    paint.setDither(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(Color.parseColor("#BAB399"));
    canvas.drawCircle(radius / 2 + 0.7f,
            radius / 2 + 0.7f, radius / 2 + 0.1f, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(sBmp, rect, rect, paint);

    return output;
}

 }

这是xml文件

 <com.example.CircularImageView
          android:layout_width="70dp"
          android:layout_height="70dp"
          app:srcCompt="@drawable/dummy />

我在stackoverflow上读了很多答案但根据我的要求找不到任何答案。我不想使用任何我想创建自己代码的库。
我是android的新手你可以告诉我想要我的代码中缺少。

Answer 1

尝试从CircularImageView而不是ImageView扩展android.support.v7.widget.AppCompatImageView。

<强> CircularImageView.java

package com.ferdous.stackoverflowanswer;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class CircularImageView extends ImageView {

    public CircularImageView(Context context) {
        super(context);
    }

    public CircularImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

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

    @Override
    protected void onDraw(Canvas canvas) {

        Drawable drawable = getDrawable();

        if (drawable == null) {
            return;
        }

        if (getWidth() == 0 || getHeight() == 0) {
            return;
        }
        Bitmap b = ((BitmapDrawable) drawable).getBitmap();
        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

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

        Bitmap roundBitmap = getRoundBitmap(bitmap, w);
        canvas.drawBitmap(roundBitmap, 0, 0, null);

    }

    public static Bitmap getRoundBitmap(Bitmap bmp, int radius) {
        Bitmap sBmp;

        if (bmp.getWidth() != radius || bmp.getHeight() != radius) {
            float smallest = Math.min(bmp.getWidth(), bmp.getHeight());
            float factor = smallest / radius;
            sBmp = Bitmap.createScaledBitmap(bmp, (int)(bmp.getWidth() / factor), (int)(bmp.getHeight() / factor), false);
        } else {
            sBmp = bmp;
        }

        Bitmap output = Bitmap.createBitmap(radius, radius,
                Bitmap.Config.ARGB_8888);


        Canvas canvas = new Canvas(output);

        final String color = "#BAB399";
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, radius, radius);

        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(Color.parseColor(color));
        canvas.drawCircle(radius / 2 + 0.7f, radius / 2 + 0.7f, radius / 2 + 0.1f, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(sBmp, rect, rect, paint);

        return output;
    }

}

在您的XML中，尝试使用属性android:src而不是app:srcCompt：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <com.ferdous.stackoverflowanswer.CircularImageView
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:src="@drawable/dummy"
        android:background="#ff0000"/>

</LinearLayout>

<强>输出：

希望这会有所帮助〜

Answer 2

使用RoundedImageView和ImageView

创建CardView的简单方法

选中此示例：https://github.com/SergeySharipov/RoundedImageView

将以下依赖项添加到您的应用模块的 build.gradle 文件中：

 dependencies {
        implementation 'com.android.support:cardview-v7:27.1.0'
 }

将代码添加到布局中并更改“YOUR_PICTURE”：

<android.support.v7.widget.CardView
        android:id="@+id/card_view_for_image"
        android:layout_margin="2dp"
        android:layout_width="200dp"
        android:layout_height="200dp"
        app:cardCornerRadius="100dp">

        <ImageView
            android:id="@+id/rounded_image_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            android:src="@drawable/YOUR_PICTURE" />

</android.support.v7.widget.CardView>

Answer 3

您可以将fresco lib用于广告image。
您需要根据文档在fresco:roundAsCircle="true"中添加属性xml layout。
此库也可用于从网络加载asynchronous图像。

Answer 4

使用Piccasso是一个非常受欢迎的库

在你的gradle中

compile 'com.makeramen:roundedimageview:2.2.1'
compile 'com.squareup.picasso:picasso:2.5.2'

在您的代码中：

Transformation transformation = new RoundedTransformationBuilder()
            .cornerRadiusDp(40)
            .oval(false)
            .build();

    Picasso.with(getApplicationContext())
            .load(//Your url image or bitmap)
            .fit()
            .transform(transformation)
            .into(//Your imageview);

Android中的圆形Imageview

4 个答案: