安卓中调用相册

说实话调用相册我觉得是一件很麻烦的事情,但是在总结完了之后发现也不过如此,就复制代码就完了
添加几个依赖(其中第三行我添加的是圆形图标的依赖如果你不用就不用加)

implementation 'com.github.bumptech.glide:glide:4.8.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.8.0'
api 'de.hdodenhof:circleimageview:2.2.0'
implementation 'com.zhihu.android:matisse:0.4.3'
implementation 'pub.devrel:easypermissions:1.2.0'

然后当前活动implement一下

EasyPermissions.PermissionCallbacks

一般你们用的是ImageView,我这里头像用的是圆形头像,不用圆形头像的改成ImageView就行了

 private CircleImageView circleImageView;
    private String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
    String photoPath = null;

 case R.id.circle_image:
                //调用相册
                getPermission();
                goPhotoAlbum();
                break;

点击事件别忘了

circleImageView.setOnClickListener(this);

private void goPhotoAlbum() {
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_PICK);
        intent.setType("image/*");
        startActivityForResult(intent, 2);
    }
private void getPermission() {
        if (EasyPermissions.hasPermissions(this, permissions)) {
            //已经打开权限
            Toast.makeText(this, "已经申请相关权限", Toast.LENGTH_SHORT).show();
        } else {
            //没有打开相关权限、申请权限
            EasyPermissions.requestPermissions(this, "需要获取您的相册权限", 1, permissions);
        }

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        //框架要求必须这么写
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }

    @Override
    public void onPermissionsGranted(int requestCode, @NonNull List<String> perms) {

    }

    @Override
    public void onPermissionsDenied(int requestCode, @NonNull List<String> perms) {

    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 2 && resultCode == RESULT_OK) {
            photoPath = getPhotoFromPhotoAlbum.getRealPathFromUri(this, data.getData());
            Glide.with(AddStudent.this).load(photoPath).into(circleImageView);
        }

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

这里还有一个将uri地址转换为绝对地址的工具类

public class getPhotoFromPhotoAlbum {
    /**
     * 根据Uri获取图片的绝对路径
     *
     * @param context 上下文对象
     * @param uri     图片的Uri
     * @return 如果Uri对应的图片存在, 那么返回该图片的绝对路径, 否则返回null
     */
    public static String getRealPathFromUri(Context context, Uri uri) {
        int sdkVersion = Build.VERSION.SDK_INT;
        if (sdkVersion >= 19) {
            return getRealPathFromUriAboveApi19(context, uri);
        } else {
            return getRealPathFromUriBelowAPI19(context, uri);
        }
    }

    /**
     * 适配api19以下(不包括api19),根据uri获取图片的绝对路径
     *
     * @param context 上下文对象
     * @param uri     图片的Uri
     * @return 如果Uri对应的图片存在, 那么返回该图片的绝对路径, 否则返回null
     */
    private static String getRealPathFromUriBelowAPI19(Context context, Uri uri) {
        return getDataColumn(context, uri, null, null);
    }

    /**
     * 适配api19及以上,根据uri获取图片的绝对路径
     *
     * @param context 上下文对象
     * @param uri     图片的Uri
     * @return 如果Uri对应的图片存在, 那么返回该图片的绝对路径, 否则返回null
     */
    @SuppressLint("NewApi")
    private static String getRealPathFromUriAboveApi19(Context context, Uri uri) {
        String filePath = null;
        if (DocumentsContract.isDocumentUri(context, uri)) {
            // 如果是document类型的 uri, 则通过document id来进行处理
            String documentId = DocumentsContract.getDocumentId(uri);
            if (isMediaDocument(uri)) {
                // 使用':'分割
                String id = documentId.split(":")[1];

                String selection = MediaStore.Images.Media._ID + "=?";
                String[] selectionArgs = {id};
                filePath = getDataColumn(context, MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection, selectionArgs);
            } else if (isDownloadsDocument(uri)) {
                Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(documentId));
                filePath = getDataColumn(context, contentUri, null, null);
            }
        } else if ("content".equalsIgnoreCase(uri.getScheme())) {
            // 如果是 content 类型的 Uri
            filePath = getDataColumn(context, uri, null, null);
        } else if ("file".equals(uri.getScheme())) {
            // 如果是 file 类型的 Uri,直接获取图片对应的路径
            filePath = uri.getPath();
        }
        return filePath;
    }

    /**
     * 获取数据库表中的 _data 列，即返回Uri对应的文件路径
     *
     */
    private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        String path = null;

        String[] projection = new String[]{MediaStore.Images.Media.DATA};
        Cursor cursor = null;
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                int columnIndex = cursor.getColumnIndexOrThrow(projection[0]);
                path = cursor.getString(columnIndex);
            }
        } catch (Exception e) {
            if (cursor != null) {
                cursor.close();
            }
        }
        return path;
    }

    /**
     * @param uri the Uri to check
     * @return Whether the Uri authority is MediaProvider
     */
    private static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri the Uri to check
     * @return Whether the Uri authority is DownloadsProvider
     */
    private static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }
}

最后还需要一个xml文件是path的,这个xml文件必须先在res之下新建一个xml包,然后放进去代码

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
   <external-path name="external_files" path="."/>
</paths>

大功告成,代码复制就完事了