Android文件篇之调用系统选择器

打开系统app资源选择器选取图片、文件方式

Intent.ACTION_PICK：图片

• android.intent.action.PICK
• intent.data获取资源
• 资源类型"content://"开头的Uri资源
• 可通过context.contentResolver获取资源内容相关信息

fun pickFile(context: Context) {  
    val intent = Intent(Intent.ACTION_PICK)  
    // "video/*"、"*/*"  
    intent.type = "image/*"  
    context.startActivityForResult(intent, REQUEST_CODE_PICK)  
}  
  
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {  
    super.onActivityResult(requestCode, resultCode, data)  
    data?:return  

    when (requestCode) {  
        REQUEST_CODE_PICK -> {  
            // uri资源仅在当前activity实例未销毁前访问，activity销毁后会报无权限uri资源错误  
            val uri = data.data  

            // 获取图片流  
            val imageStream = contentResolver.openInputStream(uri)  

            // 查询图片详细信息  
            val cursor = contentResolver.query(uri, null, null, null, null)  
        }  
    }  
}  

Intent.ACTION_GET_CONTENT：文件

// 打开PDF
fun startFileManager(type: String, requestCode: Int) {
    val intent = Intent(Intent.ACTION_GET_CONTENT)  
    intent.type = "application/pdf"
    intent.addCategory(Intent.CATEGORY_OPENABLE)  
    startActivityForResult(intent, requestCode)
}

// 图片选择
fun openImageSelector(requestCode: Int) {
    val intent = Intent(Intent.ACTION_GET_CONTENT)  
    intent.addCategory(Intent.CATEGORY_OPENABLE)  
    intent.type = "image/*"  
    intent.putExtra(  
        Intent.EXTRA_MIME_TYPES,  
        arrayOf("image/jpeg", "image/png", "image/x-ms-bmp", "image/vnd.wap.wbmp", "image/gif")
    )
    // intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*")
    try {  
        startActivityForResult(intent, requestCode)  
    } catch (e: ActivityNotFoundException) {  
        LogTool.e("e: $e")  
    }
}

// 视频选择
fun openVideoSelector(requestCode: Int) {
    val intent = Intent(Intent.ACTION_GET_CONTENT)  
    intent.type = "video/*"  
    val wrapperIntent = Intent.createChooser(intent, null)  
    startActivityForResult(wrapperIntent, requestCode)
}

Intent.ACTION_OPEN_DOCUMENT：文件