【移动应用开发技术】Android工具类ImgUtil选择相机和系统相册的示例分析

【移动应用开发技术】Android工具类ImgUtil选择相机和系统相册的示例分析

说明：代码：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

.Uri;

import

android.os.Build;

import

vider.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<String>

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("ent.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();

press(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

press(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");

}

}<!--获取sd卡写的权限，用于文件上传和下载-->

<uses-permission

android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

<uses-permission

android:name="android.permission.READ_EXTERNAL_STORAGE"/>

<!--允许读取手机状态-->

<uses-permission

android:name="android.permission.READ_PHONE_STATE"/>

<!--

相机权限

-->

<uses-permission

android:name="