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Android自定义控件实例,圆形头像(图库 + 裁剪+设置),上传头像显示为圆形

Android项目开发中经常会遇见需要实现圆角或者圆形的图片功能,如果仅仅使用系统自带的ImageView控件显然无法实现此功能,所以通过系列文章的形式由简到繁全方位的介绍一下此功能的实...

Android项目开发中经常会遇见需要实现圆角或者圆形的图片功能,如果仅仅使用系统自带的ImageView控件显然无法实现此功能,所以通过系列文章的形式由简到繁全方位的介绍一下此功能的实现,巩固一下自身的学习,同时,和广大网友交流分享

首先看效果图

首先看一下CircleImageView的主要流程

1. 首先通过setImageXxx()方法设置图片Bitmap;

2. 进入构造函数CircleImageView()获取自定义参数,以及调用setup()函数;

3. 进入setup()函数(非常关键),进行图片画笔边界画笔(Paint)一些重绘参数初始化:构建渲染器BitmapShader用Bitmap来填充绘制区域,设置样式和内外圆半径计算等,以及调用updateShaderMatrix()函数和 invalidate()函数;

4. 进入updateShaderMatrix()函数,计算缩放比例和平移,设置BitmapShader的Matrix参数等;

5. 触发ondraw()函数完成最终的绘制。使用配置好的Paint先画出绘制内圆形来以后再画边界圆形。

下面看具体的代码实现:

attr.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="roundedimageview">
        <attr name="border_thickness" format="dimension" />
        <attr name="border_inside_color" format="color" />
        <attr name="border_outside_color" format="color"></attr>
    </declare-styleable>
</resources>

然后是自定义ImageView的实现类:

RoundImageView.class
        
**
 * 圆形ImageView,可设置最多两个宽度不同且颜色不同的圆形边框。
 * 设置颜色在xml布局文件中由自定义属性配置参数指定
 */
public class RoundImageView extends ImageView {
    private int mBorderThickness = 0;
    private Context mContext;
    private int defaultColor = 0xFFFFFFFF;
    // 如果只有其中一个有值,则只画一个圆形边框
    private int mBorderOutsideColor = 0;
    private int mBorderInsideColor = 0;
    // 控件默认长、宽
    private int defaultWidth = 0;
    private int defaultHeight = 0;
//构造方法,参数上下文
    public RoundImageView(Context context) {
        super(context);
        mContext = context;
    }

    public RoundImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        setCustomAttributes(attrs);
    }

    public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mContext = context;
        setCustomAttributes(attrs);
    }

    private void setCustomAttributes(AttributeSet attrs) {
        TypedArray a = mContext.obtainStyledAttributes(attrs, R.styleable.roundedimageview);
        mBorderThickness = a.getDimensionPixelSize(R.styleable.roundedimageview_border_thickness, 0);
        mBorderOutsideColor = a.getColor(R.styleable.roundedimageview_border_outside_color, defaultColor);
        mBorderInsideColor = a.getColor(R.styleable.roundedimageview_border_inside_color, defaultColor);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Drawable drawable = getDrawable();
        if (drawable == null) {
            return;
        }
        if (getWidth() == 0 || getHeight() == 0) {
            return;
        }
        this.measure(0, 0);
        if (drawable.getClass() == NinePatchDrawable.class)
            return;
        Bitmap b = ((BitmapDrawable) drawable).getBitmap();
        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
        if (defaultWidth == 0) {
            defaultWidth = getWidth();
        }
        if (defaultHeight == 0) {
            defaultHeight = getHeight();
        }
        int radius = 0;
        if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {// 定义画两个边框,分别为外圆边框和内圆边框
            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness;
            // 画内圆
            drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor);
            // 画外圆
            drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / 2, mBorderOutsideColor);
        } else if (mBorderInsideColor != defaultColor && mBorderOutsideColor == defaultColor) {// 定义画一个边框
            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;
            drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor);
        } else if (mBorderInsideColor == defaultColor && mBorderOutsideColor != defaultColor) {// 定义画一个边框
            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;
            drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderOutsideColor);
        } else {// 没有边框
            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2;
        }
        Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);
        canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null);
    }

    /**
     * 获取裁剪后的圆形图片
     *
     * @param
     */
//    radius半径
    public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
        Bitmap scaledSrcBmp;
        int diameter = radius * 2;
        // 为了防止宽高不相等,造成圆形图片变形,因此截取长方形中处于中间位置最大的正方形图片
        int bmpWidth = bmp.getWidth();
        int bmpHeight = bmp.getHeight();
        int squareWidth = 0, squareHeight = 0;
        int x = 0, y = 0;
        Bitmap squareBitmap;
        if (bmpHeight > bmpWidth) {// 高大于宽
            squareWidth = squareHeight = bmpWidth;
            x = 0;
            y = (bmpHeight - bmpWidth) / 2;
            // 截取正方形图片
            squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);
        } else if (bmpHeight < bmpWidth) {// 宽大于高
            squareWidth = squareHeight = bmpHeight;
            x = (bmpWidth - bmpHeight) / 2;
            y = 0;
            squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);
        } else {
            squareBitmap = bmp;
        }
        if (squareBitmap.getWidth() != diameter || squareBitmap.getHeight() != diameter) {
            scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter, diameter, true);
        } else {
            scaledSrcBmp = squareBitmap;
        }
        Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
                scaledSrcBmp.getHeight(),
                Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        Paint paint = new Paint();
        Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(), scaledSrcBmp.getHeight());

        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
                scaledSrcBmp.getHeight() / 2,
                scaledSrcBmp.getWidth() / 2,
                paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
        bmp = null;
        squareBitmap = null;
        scaledSrcBmp = null;
        return output;
    }

    /**
     * 边缘画圆
     */
    private void drawCircleBorder(Canvas canvas, int radius, int color) {
        Paint paint = new Paint();
            /* 去锯齿 */
        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        paint.setColor(color);
            /* 设置paint的    style    为STROKE:空心 */
        paint.setStyle(Paint.Style.STROKE);
            /* 设置paint的外框宽度 */
        paint.setStrokeWidth(mBorderThickness);
        canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);
    }
}

使用时非常简单,直接在布局中调用自定义的类

activity_main.xml,这里要注意的是,第二个是带有边框的,效果图如上

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.ceshi.MainActivity">

    <Button
        android:id="@+id/aaa"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击设置头像" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <com.example.ceshi.RoundImageView
            android:id="@+id/image"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content" />
        <!-- border_outside_color 外部圆圈的颜色 -->
        <!-- border_inside_color 内部部圆圈的颜色 -->
        <!-- border_thickness 外圆和内圆的宽度 -->
        <com.example.ceshi.RoundImageView
            android:id="@+id/img2"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            imagecontrol:border_inside_color="#bc0978"
            imagecontrol:border_outside_color="#ba3456"
            imagecontrol:border_thickness="1dp" />
    </LinearLayout>

打开图库选取图片,截取图片和设置图片在MainActivity.class中实现

MainActivity.class

public class MainActivity extends AppCompatActivity {
    private Button bt;
    private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择
    private static final int PHOTO_REQUEST_CUT = 3;// 结果
    private ImageView photo,photo2;
    private File tempFile;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        photo= (ImageView) findViewById(R.id.image);
        photo2= (ImageView) findViewById(R.id.img2);

        bt = (Button) findViewById(R.id.aaa);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
//                Intent intent=new Intent(Intent.ACTION_PICK);
//                intent.setType("image/*");
//                startActivityForResult(intent,PHOTO_REQUEST_GALLERY);
                // 激活系统图库,选择一张图片
                Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setType("image/*");
                // 开启一个带有返回值的Activity,请求码为PHOTO_REQUEST_GALLERY
                startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
            }
        });
    }

    /*
            * 剪切图片
            */
    private void crop(Uri uri) {
        // 裁剪图片意图
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        intent.putExtra("crop", "true");
        // 裁剪框的比例,1:1
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // 裁剪后输出图片的尺寸大小
        intent.putExtra("outputX", 250);
        intent.putExtra("outputY", 250);

        intent.putExtra("outputFormat", "JPEG");// 图片格式
        intent.putExtra("noFaceDetection", true);// 取消人脸识别
        intent.putExtra("return-data", true);
        // 开启一个带有返回值的Activity,请求码为PHOTO_REQUEST_CUT
        startActivityForResult(intent, PHOTO_REQUEST_CUT);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == PHOTO_REQUEST_GALLERY) {
            // 从相册返回的数据
            if (data != null) {
                // 得到图片的全路径
                Uri uri = data.getData();
                crop(uri);
            }
        } else if (requestCode == PHOTO_REQUEST_CUT) {
            // 从剪切图片返回的数据
            if (data != null) {
                Bitmap bitmap = data.getParcelableExtra("data");
                photo.setImageBitmap(bitmap);
                photo2.setImageBitmap(bitmap);
            }
            try {
                // 将临时文件删除
                tempFile.delete();
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
        super.onActivityResult(requestCode, resultCode, data);

    }
}

以上就可以实现自定义控件,设置圆形头像

来自:http://www.cnblogs.com/dingxiansen/p/6135795.html