Android FileProvider使用教程

	<provider
            android:authorities="${packagename}.provider"
            android:name="com.flx.cn.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_provider" />
	</provider>

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <paths>
    <!--<root-path/> 代表设备的根目录new File("/");-->
    <root-path
        name = ""
        path=""/>
    <!-- Context.getFilesDir() + "/path/" -->
    <files-path
        name="my_files"
        path="test/"/>
    <!-- Context.getCacheDir() + "/path/" -->
    <cache-path
        name="my_cache"
        path="test/"/>
    <!-- Context.getExternalFilesDir(null) + "/path/" -->
    <external-files-path
        name="external-files-path"
        path="test/"/>
    <!-- Context.getExternalCacheDir() + "/path/" -->
    <external-cache-path
         name="name"
         path="test/" />
    <!-- Environment.getExternalStorageDirectory() + "/path/" -->
    <external-path
        name="my_external_path"
        path="test/"/>
    <!-- Environment.getExternalStorageDirectory() + "/path/" -->
    <external-path
        name="files_root"
        path="Android/data/<包名>/"/>
    <!-- path设置为'.'时代表整个存储卡 Environment.getExternalStorageDirectory() + "/path/"   -->
    <external-path
        name="external_storage_root"
        path="."/>
  </paths>
</resources>

File filePath = new File(Context.getFilesDir(), "my_log");
File newFile = new File(filePath, "my_log.log");
// 生成Uri
Uri contentUri = FileProvider.getUriForFile(getContext(), "com.flx.cn.fileprovider", newFile);

// 这里用的是发送文件。
Intent intent = new Intent(Intent.ACTION_SEND);
// 设置读写权限
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
//Uri传入Intent
intent.putExtra(Intent.EXTRA_STREAM, contentUri);
startActivity(intent)