Android工具类ImgUtil选择相机和系统相册

package com.gxjl.pe.gxjlpesdk.util;
 
import android.Manifest;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.FileProvider;
import android.widget.Toast;
 
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
 
/**
 * 图片工具类
 * Created by xiaoshuai on 2018/8/17.
 */
 
public class ImgUtil {
 public static final int TAKE_PHOTO = 1;//拍照
 public static final int CHOOSE_PHOTO = 2;//选择相册
 public static final int REQUEST_CODE_CAMERA = 3;//相机权限请求
 public static final int REQUEST_CODE_ALBUM = 4;//相册权限请求
 public static Uri imageUri;//相机拍照图片保存地址
 
 /**
  * 选择图片，从图库、相机
  *
  * @param activity 上下文
  */
 public static void choicePhoto(final Activity activity) {
  //采用的是系统Dialog作为选择弹框
  new AlertDialog.Builder(activity).setTitle("上传头像")//设置对话框标题
    .setPositiveButton("拍照", new DialogInterface.OnClickListener() {//添加确定按钮
     @Override
     public void onClick(DialogInterface dialog, int which) {
      if (Build.VERSION.SDK_INT >= 23) {//检查相机权限
       ArrayList permissions = new ArrayList<>();
       if (activity.checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
        permissions.add(Manifest.permission.CAMERA);
       }
 
       if (permissions.size() == 0) {//有权限,跳转
        //打开相机-兼容7.0
        openCamera(activity);
       } else {
        activity.requestPermissions(permissions.toArray(new String[permissions.size()]), REQUEST_CODE_CAMERA);
       }
      } else {
       //打开相机-兼容7.0
       openCamera(activity);
      }
     }
    }).
    setNegativeButton("系统相册", new DialogInterface.OnClickListener() {
     @Override
     public void onClick(DialogInterface dialog, int which) {
      //如果有权限申请，请在Activity中onRequestPermissionsResult权限返回里面重新调用openAlbum()
      if (ContextCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
       ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CODE_ALBUM);
      } else {
       openAlbum(activity);
      }
     }
    }).show();//在按键响应事件中显示此对话框
 }
 
 /**
  * 打开相机
  * 兼容7.0
  *
  * @param activity
  */
 public static void openCamera(Activity activity) {
  // 创建File对象，用于存储拍照后的图片
  File outputImage = new File(activity.getExternalCacheDir(), "output_image.jpg");
  try {
   if (outputImage.exists()) {
    outputImage.delete();
   }
   outputImage.createNewFile();
  } catch (IOException e) {
   e.printStackTrace();
  }
  if (Build.VERSION.SDK_INT < 24) {
   imageUri = Uri.fromFile(outputImage);
  } else {
   //Android 7.0系统开始 使用本地真实的Uri路径不安全,使用FileProvider封装共享Uri
   //参数二:fileprovider绝对路径 com.dyb.testcamerademo：项目包名
   imageUri = FileProvider.getUriForFile(activity, "com.mandaotech.ewallet.fileprovider", outputImage);
  }
  // 启动相机程序
  Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
  intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
  activity.startActivityForResult(intent, TAKE_PHOTO);
 }
 
 /**
  * 打开图库
  * @param activity
  */
 public static void openAlbum(Activity activity) {
  //调用系统图库的意图
  Intent choosePicIntent = new Intent(Intent.ACTION_PICK, null);
  choosePicIntent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
  activity.startActivityForResult(choosePicIntent, CHOOSE_PHOTO);
 
  //打开系统默认的软件
  //Intent intent = new Intent("android.intent.action.GET_CONTENT");
  //intent.setType("image/*");
  //activity.startActivityForResult(intent, CHOOSE_PHOTO); // 打开相册
 }
 
 /**
  * 得到byte[]
  * 这里对传入的图片Uri压缩到1M以内，并转换为byte[]后返回
  *
  * @param activity 上下文
  * @param uri  传入图片的Uri
  * @return byte[]
  */
 public static byte[] getImgByteFromUri(Activity activity, Uri uri) throws IOException {
  Bitmap bitmap = MediaStore.Images.Media.getBitmap(activity.getContentResolver(), uri);
  ByteArrayOutputStream out = new ByteArrayOutputStream();
  bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);//100表示不压缩，直接放到out里面
  int options = 90;//压缩比例
  while (out.toByteArray().length / 1024 > 200) { // 循环判断如果压缩后图片是否大于100kb,大于继续压缩
   out.reset(); // 重置baos即清空baos
   bitmap.compress(Bitmap.CompressFormat.JPEG, options, out);// 这里压缩options%，把压缩后的数据存放到baos中
   options -= 10;// 每次都减少10
  }
  byte[] bs = out.toByteArray();
 
  return bs;
 }
 
}

@Override
 public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
  switch (requestCode) {
   case REQUEST_CODE_ALBUM://相册存储权限
    if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
     ImgUtil.openAlbum(this);
    } else {
     UiUtil.showToast(this, "选择图库需要同意权限");
    }
    break;
   case REQUEST_CODE_CAMERA://相机拍照权限
    if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {//允许
     ImgUtil.openCamera(OcrHandReviewActivity.this);
    } else {//拒绝
     UiUtil.showToast(this, "只有同意相机权限,才能使用扫码功能");
    }
    break;
   default:
  }
 }

//相机、相册、剪切 返回
 @Override
 public void onActivityResult(int requestCode, int resultCode, Intent data) {
 
  //正确返回
  if (resultCode == RESULT_OK) {
   switch (requestCode) {
    case ImgUtil.TAKE_PHOTO://相机返回
     Log.e("返回相机", ImgUtil.imageUri.toString());
  
  GlideApp.with(ElecIdPAActivity.this)
        .load(ImgUtil.imageUri)
        .skipMemoryCache(true)
        .diskCacheStrategy( DiskCacheStrategy.NONE )
        .into(iv_zhengmain_photo);
     break;
    case ImgUtil.CHOOSE_PHOTO://相册返回
     try {
      if (data != null) {
       //相册返回
       Uri uri = data.getData();
       Log.e("返回相册", uri.toString());
  
  GlideApp.with(ElecIdPAActivity.this)
   .load(uri)
   .skipMemoryCache(true)
   .diskCacheStrategy( DiskCacheStrategy.NONE )
   .into(iv_zhengmain_photo);
      }
     } catch (Exception e) {
      e.printStackTrace();
      UiUtil.showToast(this, "图片选择失败");
     }
     break;
   }
  } else {
   UiUtil.showToast(this, "图片选择失败");
  }
 }