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("ima
4000
ge/*");
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 (bmpHei
c3fa
ght < 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.csdn.net/detail/lmq121210/9901254