android 拍照和相册选择照片之后。剪裁图片。

很多APP可能都会实现此功能：从相机或系统相册选择图片，然后剪裁，上传服务器，当作头像。这时，这个demo就派上用场了。
先看下结果图：

相关权限：

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

首先看下定义变量：

    private Uri uritempFile;//剪裁之后的图片存储的路径
    private File tempFile;//剪裁之前的原始图片文件
    private static final String PHOTO_FILE_NAME = "temp_photo.jpg";//拍照照片的名称

    private static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
    private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择
    private static final int PHOTO_REQUEST_CUT = 3;// 剪裁之后标记

然后首先是从相册选择图片：

/*
     * 从相册获取
     */
    public void gallery() {
        // 激活系统图库，选择一张图片
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");
        startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
    }

然后是相机拍照：

    /*
     * 从相机获取
     */
    public void camera(View view) {
        // 激活相机
        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        // 判断存储卡是否可以用，可用进行存储
        if (hasSdcard()) {
            tempFile = new File(Environment.getExternalStorageDirectory(),
                    PHOTO_FILE_NAME);
            // 从文件中创建uri
            Uri uri = Uri.fromFile(tempFile);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
        }
        // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CAREMA
        startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
    }
    /*
     * 判断sdcard是否被挂载
     */
    private boolean hasSdcard() {
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            return true;
        } else {
            return false;
        }
    }

这两个最终结果如何，我们需要在activity中重写onActivityResult方法，

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent 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_CAREMA) {
            // 从相机返回的数据
            if (hasSdcard()) {
                crop(Uri.fromFile(tempFile));
            } else {
                Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！", Toast.LENGTH_SHORT).show();
            }

        } else if (requestCode == PHOTO_REQUEST_CUT) {
            /*
             *剪裁之后的图片  uritempFile为剪裁之后的图片存储的路径
             * TODO 可以拿着这个uritempFile路径二次访问服务器，上传裁剪之后的图片
             */
            try {
                Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uritempFile));
                this.imageview.setImageBitmap(bitmap);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            try {
                // 将临时文件删除
                tempFile.delete();
            } catch (Exception e) {
                e.printStackTrace();
            }

        }

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

最后是剪裁图片：如果我们需要获取剪裁之后的图片路径，这时我们需要设置 intent.putExtra(MediaStore.EXTRA_OUTPUT, uritempFile);方法。 而uritempFile就是我们创建的存储裁剪之后文件的路径，这是我们可以在onActivityResult方法中执行上传服务器等操作；

    /*
     * 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  这个比例可以根据项目需求更改
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // 裁剪后输出图片的尺寸大小，这个比例可以根据项目需求更改
        intent.putExtra("outputX", 250);
        intent.putExtra("outputY", 250);

        intent.putExtra("noFaceDetection", true);// 取消人脸识别
        intent.putExtra("return-data", true);
        /**
         * 此方法返回的图片只能是小图片（sumsang测试为高宽160px的图片）
         * 故将图片保存在Uri中，调用时将Uri转换为Bitmap，此方法还可解决miui系统不能return data的问题
         * uritempFile的存储路径可以自定义
         */
        uritempFile = Uri.parse("file://" + "/" + Environment.getExternalStorageDirectory().getPath() + "/" + "small.jpg");
        intent.putExtra(MediaStore.EXTRA_OUTPUT, uritempFile);
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
        // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CUT
        startActivityForResult(intent, PHOTO_REQUEST_CUT);
    }

至此选择照片以及裁剪照片就完成了，个人感觉这也是符合很多公司一般需求的。

至于设置成圆形的头像的话，顺便附上代码：

package com.app.test.testcamary;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
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.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * Created by ${liumengqiang} on 2017/7/17.
 */

public class Circleview  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 Circleview(Context context) {
        super(context);
        mContext = context;
    }

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

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

    private void setCustomAttributes(AttributeSet attrs) {

    }

    @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);
    }
}

至于圆形图片怎么使用 我就不多说了。

附上源码地址:

http://download.youkuaiyun.com/detail/lmq121210/9901254