Question

我将所选文件上传到服务器，但我知道我想让restrick用户只选择文档文件（.doc，.pdf等）和图像文件。

现在我的代码适用于所有提取uri文件的文件，所以请告诉我如何限制用户只选择特定类型的文件。

这是我选择任何文件的代码。

Intent i=new Intent();
                i.setType("*/*");
                i.setAction(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                startActivityForResult(Intent.createChooser(i, "abc"),requestCode);

Answer 1

将多个MIME类型与|分开像

i.setType("image/*|application/pdf|audio/*");

或创建一个MIME类型数组，如

String[] mimetypes = {"image/*", "application/*|text/*"};

并将其作为

传递

i.putExtra(Intent.EXTRA_MIME_TYPES, mimetypes);

Answer 2

虽然不是通过Intent，但我找到了droidninja的一个很好的图书馆项目，它可以让人们一次浏览本地存储的doc文件或图像。

repositories {
    jcenter()
    maven {
        url "https://jitpack.io"
    }
}

将其插入app.gradle文件

compile 'com.droidninja:filepicker:1.0.6'

然后在给定函数下面调用此函数以获得一个材料主题对话框，该对话框将提供一个选项来选择是选择图像或组还是与文档相同

private void showFileChooser() {

    new MaterialStyledDialog.Builder(getActivity())
            .setTitle("Upload Documents")
            .setDescription("Upload single or multiple documents in a single attempt now, maximum being 5.\n \nChoose between Images option or PDF's option now. \n")
            //.setStyle(Style.HEADER_WITH_ICON)
            .setHeaderColor(R.color.colorPrimary)
            .withDialogAnimation(true)
            .setIcon(R.drawable.ic_pdf)
            .setCancelable(true)
            .autoDismiss(false)
            .setPositiveText(R.string.images)
            .onPositive(new MaterialDialog.SingleButtonCallback() {
                @Override
                public void onClick(@NonNull MaterialDialog dialog, @NonNull DialogAction which) {
                    dialog.dismiss();
                    FilePickerBuilder.getInstance().setMaxCount(5)
                            .setSelectedFiles(selectedPhotos)
                            .setActivityTheme(R.style.AppTheme)
                            .pickPhoto(getActivity());
                }
            })
            .setNeutralText(R.string.pdf)
            .onNeutral(new MaterialDialog.SingleButtonCallback() {
                @Override
                public void onClick(@NonNull MaterialDialog dialog, @NonNull DialogAction which) {
                    dialog.dismiss();
                    FilePickerBuilder.getInstance().setMaxCount(5)
                            .setSelectedFiles(filePaths)
                            .setActivityTheme(R.style.AppTheme)
                            .pickDocument(getActivity());
                }
            })
            .show();
}

但是对于此对话框，您需要具有gradle文件

compile com.github.javiersantos:MaterialStyledDialogs:2.0'

最后，将调用onActivityResult（）来提取类似这样的结果

   @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case FilePickerConst.REQUEST_CODE_PHOTO:
                if (resultCode == Activity.RESULT_OK && data != null) {
                    selectedPhotos = new ArrayList<>();
                    selectedPhotos.addAll(data.getStringArrayListExtra(FilePickerConst.KEY_SELECTED_PHOTOS));
                }
                break;
            case FilePickerConst.REQUEST_CODE_DOC:
                if (resultCode == Activity.RESULT_OK && data != null) {
                    filePaths = new ArrayList<>();
                    filePaths.addAll(data.getStringArrayListExtra(FilePickerConst.KEY_SELECTED_DOCS));
                }
                break;
        }

    }

<强> AppTheme

  <!-- Base application theme. -->
    <style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">

        <!-- Customize your theme here. -->
        <item name="android:windowNoTitle">true</item>
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

Answer 3

基于上述答案和类似的线索，我开发了一个可行的解决方案。我正在共享代码段，因此易于使用。

如何使用意图针对特定文件类型过滤或选择文件。

代码

public static Intent getCustomFileChooserIntent(String ...types){
            Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
            // Filter to only show results that can be "opened"
            intent.addCategory(Intent.CATEGORY_OPENABLE);
            intent.setType("*/*");
            intent.putExtra(Intent.EXTRA_MIME_TYPES, types);
            return intent;
        }

示例文件类型常量

        public static final String DOC = "application/msword";
        public static final String DOCX = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
        public static final String IMAGE = "image/*";
        public static final String AUDIO = "audio/*";
        public static final String TEXT = "text/*";
        public static final String PDF = "application/pdf";
        public static final String XLS = "application/vnd.ms-excel";

用法

  // i passed string values, you can pass a array of string too.
    Intent intent = getCustomFileChooserIntent(DOC, PDF, IMAGE);

    startActivityForResult(intent, 101);

Answer 4

我所做的是将 setType 设置为 imageIntent.setType("image/*\", \"application/pdf");

如何通过android中的意图选择几种类型的文件？

4 个答案: