Android 之打开相机打开相册

野性酷女 2023-09-27 16:35 141阅读 0赞

Android 之 打开系统摄像头拍照 打开系统相册，并展示

![048293c67da93a9dafa3596fd8060e28.png][]

###### 1，清单文件 AndroidManifest.xml ######

\`\`\`

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

<uses-permission android:name="android.permission.READ\_EXTERNAL\_STORAGE" />

<uses-permission android:name="android.permission.WRITE\_EXTERNAL\_STORAGE" />

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

<uses-feature android:name="android.hardware.camera" />

<uses-feature android:name="android.hardware.camera.autofocus" />

...

<provider

android:name="androidx.core.content.FileProvider"

android:authorities="com.example.camera.fileprovider"

android:grantUriPermissions="true">

<meta-data

android:name="android.support.FILE\_PROVIDER\_PATHS"

android:resource="@xml/my\_image" />

</provider>

</application>

\`\`\`

###### 2，配置文件 my\_image.xml ######

\`\`\`

<?xml version="1.0" encoding="utf-8"?>

<paths xmlns:android="[" target="\_blank">http://schemas.android.com/apk/res/android">][target_blank_http_schemas.android.com_apk_res_android]

<external-path

name="my\_image"

path="/" />

</paths>

\`\`\`

###### 3，布局 ######

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="[http://schemas.android.com/apk/res/android"][target_blank_http_schemas.android.com_apk_res_android]

xmlns:app="[http://schemas.android.com/apk/res-auto"][http_schemas.android.com_apk_res-auto]

xmlns:tools="[http://schemas.android.com/tools"][http_schemas.android.com_tools]

android:layout\_width="match\_parent"

android:layout\_height="match\_parent"

android:orientation="vertical"

tools:context="com.sjl.nfc.MainActivity">

<ImageView

android:id="@+id/main\_img01"

android:layout\_width="200dp"

android:layout\_height="200dp"

android:layout\_gravity="center\_horizontal"

android:src="@drawable/img\_mine06" />

<Button

android:id="@+id/main\_btn01"

android:layout\_width="wrap\_content"

android:layout\_height="wrap\_content"

android:layout\_gravity="center\_horizontal"

android:text="打开相机" />

<Button

android:id="@+id/main\_btn02"

android:layout\_width="wrap\_content"

android:layout\_height="wrap\_content"

android:layout\_gravity="center\_horizontal"

android:text="打开相册" />

</LinearLayout>

###### 4，主要代码 java ######

package com.sjl.nfc;

import android.annotation.TargetApi;

import android.app.Activity;

import android.content.ContentUris;

import android.content.Intent;

import android.database.Cursor;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.drawable.BitmapDrawable;

import [android.net][].Uri;

import android.os.Bundle;

import android.provider.DocumentsContract;

import android.provider.MediaStore;

import android.util.Base64;

import android.util.Log;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

import androidx.annotation.Nullable;

import androidx.appcompat.app.AppCompatActivity;

import androidx.core.content.FileProvider;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

*/\*\**

*\* 项目模板*

*\*/*

public class MainActivity extends AppCompatActivity \{

private static final String *TAG* = "MainActivity";

private ImageView main\_img01;

private Uri imageUri;

@Override

protected void onCreate(@Nullable Bundle savedInstanceState) \{

super.onCreate(savedInstanceState);

setContentView(R.layout.*main\_activity*);

main\_img01 = findViewById(R.id.*main\_img01*);

Button main\_btn01 = findViewById(R.id.*main\_btn01*); // 打开相机

Button main\_btn02 = findViewById(R.id.*main\_btn02*); // 打开相册

main\_btn01.setOnClickListener(v -> \{

// 打开相机

File outputImage = new File(getExternalCacheDir(), "shenhuiran\_" + System.*currentTimeMillis*() + ".jpg"); // 名称（“shenhuiran\_”+系统当前时间Millis（）

if (outputImage.exists()) outputImage.delete();

try \{

outputImage.createNewFile();

\} catch (IOException e) \{

e.printStackTrace();

imageUri = FileProvider.*getUriForFile*(this, "com.example.camera.fileprovider", outputImage);

Intent intent = new Intent("android.media.action.IMAGE\_CAPTURE");

intent.putExtra(MediaStore.*EXTRA\_OUTPUT*, imageUri);

startActivityForResult(intent, *TAKE\_PHOTO*);

\});

main\_btn02.setOnClickListener(v -> \{

// 打开相册

// 在Activity Action里面有一个“ACTION\_GET\_CONTENT”字符串常量，

// 该常量让用户选择特定类型的数据，并返回该数据的URI.我们利用该常量，

// 然后设置类型为“image/\*”，就可获得Android手机内的所有image。\*/

Intent intent = new Intent("android.intent.action.GET\_CONTENT");

intent.setType("image/\*"); // 开启Pictures画面Type设定为image

// 打开相册

startActivityForResult(intent, *CHOOSE\_PHOTO*);

\});

*/\*\**

*\* 获取活动或片段的位图和图像路径onActivityResult*

*\**

*\** ***@param*** *requestCode*

*\** ***@param*** *resultCode*

*\** ***@param*** *data*

*\*/*

public static final int *TAKE\_PHOTO* = 1;

public static final int *CROP\_PHOTO* = 2;

public static final int *CHOOSE\_PHOTO* = 3;

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) \{

super.onActivityResult(requestCode, resultCode, data);

switch (requestCode) \{

case *TAKE\_PHOTO*:

if (resultCode == Activity.*RESULT\_OK*) \{

try \{

Bitmap bitmap = BitmapFactory.*decodeStream*(getContentResolver().openInputStream(imageUri));

main\_img01.setImageBitmap(bitmap); // 展示刚拍过的照片

getImgBase64(main\_img01); // 直接把 imageview 取出图片转换为base64格式

\} catch (FileNotFoundException e) \{

e.printStackTrace();

break;

case *CROP\_PHOTO*:

if (resultCode == *RESULT\_OK*) \{

try \{

Bitmap bitmap = BitmapFactory.*decodeStream*(getContentResolver().openInputStream(imageUri));

// 显示裁剪后的图片

main\_img01.setImageBitmap(bitmap);

\} catch (FileNotFoundException ex) \{

ex.printStackTrace();

break;

case *CHOOSE\_PHOTO*:

if (resultCode == *RESULT\_OK*) \{

handleImage(data);

break;

default:

break;

// 只在Android4.4及以上版本使用

@TargetApi(19)

private void handleImage(Intent data) \{

String imagePath = null;

Uri uri = data.getData();

if (DocumentsContract.*isDocumentUri*(this, uri)) \{

// 通过document id来处理

String docId = DocumentsContract.*getDocumentId*(uri);

if ("com.android.providers.media.documents".equals(uri.getAuthority())) \{

// 解析出数字id

String id = docId.split(":")\[1\];

String selection = MediaStore.Images.Media.*\_ID* \+ "=" + id;

imagePath = getImagePath(MediaStore.Images.Media.*EXTERNAL\_CONTENT\_URI*, selection);

\} else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) \{

Uri contentUri = ContentUris.*withAppendedId*(Uri.*parse*("content://downloads/public\_downloads"), Long.*valueOf*(docId));

imagePath = getImagePath(contentUri, null);

\} else if ("content".equals(uri.getScheme())) \{

// 如果不是document类型的Uri，则使用普通方式处理

imagePath = getImagePath(uri, null);

// 根据图片路径显示图片

displayImage(imagePath);

private String getImagePath(Uri uri, String selection) \{

String path = null;

// 通过Uri和selection来获取真实图片路径

Cursor cursor = getContentResolver().query(uri, null, selection, null, null);

if (cursor != null) \{

if (cursor.moveToFirst()) \{

path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.*DATA*));

cursor.close();

return path;

private void displayImage(String imagePath) \{

if (imagePath != null) \{

Bitmap bitmap = BitmapFactory.*decodeFile*(imagePath);

main\_img01.setImageBitmap(bitmap);

\} else \{

Toast.*makeText*(this, "failed to get image", Toast.*LENGTH\_SHORT*).show();

*/\*\**

*\* imageview取出图片转换为base64格式*

*\**

*\** ***@param*** *imageView*

*\** ***@return***

*\*/*

private String takeimage;

public String getImgBase64(ImageView imageView) \{

BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();

Bitmap bitmap = drawable.getBitmap();

ByteArrayOutputStream bos = new ByteArrayOutputStream();

bitmap.compress(Bitmap.CompressFormat.*PNG*, 100, bos);

byte\[\] bb = bos.toByteArray();

takeimage = Base64.*encodeToString*(bb, Base64.*NO\_WRAP*);

Log.*d*("111111 TakeActivity >>", "打印base64>>:" + takeimage);

// takeTv.setText("打印base64>>:" + image);

// jsJson.put("photographAdditionBase64", "data:image/png;base64," + takeimageview); // 图片上传，上传

return takeimage;

[048293c67da93a9dafa3596fd8060e28.png]: https://img-blog.csdnimg.cn/img_convert/048293c67da93a9dafa3596fd8060e28.png
[target_blank_http_schemas.android.com_apk_res_android]: http://schemas.android.com/apk/res/android
[http_schemas.android.com_apk_res-auto]: http://schemas.android.com/apk/res-auto
[http_schemas.android.com_tools]: http://schemas.android.com/tools
[android.net]: https://android.net