Android - 文件提供商 - 通过电子邮件发送文件

Question

我目前正在寻找一种方法来将文件保存在设备的内部存储器中，然后通过邮件发送。为此，我使用 FileProvider

所以在 Android Manifest 中，我将这些行添加到我的清单中：

 <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="exploration.syte.fr.sendbymail4.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/paths" />

    </provider>

在 res/xml 路径上我添加了这个文件路径：paths.xml

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <files-path name="files" path="files/"/>

</paths>

这是我用来创建文件的代码 - 一个非常简单的文本文件，其中包含“test”一词。

protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  String textToWrite = "test";
  try {
    File path = this.getFilesDir();
    File file = new File(path, "myfile.txt");
    String chemin = file.getAbsolutePath().toString();
    Log.i("MainActivity", chemin);
    Toast.makeText(this, chemin, Toast.LENGTH_LONG).show();
    FileOutputStream fos = new FileOutputStream(file);
    fos.write(textToWrite.getBytes());
    fos.close();
    //Toast.makeText(this, "File correctly saved", Toast.LENGTH_LONG).show();
  } catch (Exception e) {
    Log.d("Main", "Exception", e);
  }
  try {
    sendFile(this);
  } catch (Exception e) {
    Log.d("Main", "Exception", e);
  }
}

以及我用来通过电子邮件发送文件的代码

 public static void sendFile(Context context){
        Intent intent=new Intent(Intent.ACTION_SEND);
        intent.setType("text/plain");
        String directory=(String.valueOf(context.getFilesDir())/*+File.separator+"directory"*/);
        File file=new File(directory+File.separator+"myfile.txt");

        Uri uri = FileProvider.getUriForFile(context, "exploration.syte.fr.sendbymail4.fileprovider", file);
        intent.putExtra(Intent.EXTRA_STREAM, uri);
        intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        context.startActivity(intent);
    }

**我目前遇到的问题是：**

• 我的文件没有保存在正确的目录：它保存在/data/user/0/exploration.syte.fr.sendbymail4/files/myfile.txt

我希望我的文件保存在：/data/data/exploration.syte.fr.sendbymail4/files/myfile.txt

如果文件保存正确，如何设置路径？

提前致谢！

Answer 1

我会保存图片

    public static String saveImage(Context context, Bitmap finalBitmap) {
        String root = context.getFilesDir().getAbsolutePath();
//        String root = context.getCacheDir().getAbsolutePath();
        File myDir = new File(root + subFolder);
        if (!myDir.exists()) {
            myDir.mkdirs();
        }
        File file = new File(myDir, dateFilenameFormat.format(new Date()) + ".jpg");
        try {
            FileOutputStream out = new FileOutputStream(file);
            downScale(finalBitmap).compress(Bitmap.CompressFormat.JPEG, 90, out);
            out.flush();
            out.close();
            return file.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

file_provider_paths.xml

<paths>
    <cache-path name="cache" path="/" />
    <files-path name="files" path="/" />
</paths>

并发送（从“缓存”或“文件”目录中获取 getFilesDir 或 getFilesDir）

public static void sendEmail(String attachmentFile, String message, Context context) {
try {
    String email = "myname@gmail.com";
    String subject = "subject";
    final Intent intent = new Intent(android.content.Intent.ACTION_SEND);
    intent.putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{email});
    intent.putExtra(android.content.Intent.EXTRA_SUBJECT, subject);
    intent.setType("image/*");
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

    // generate URI, I defined authority as the application ID in the Manifest, the last param is file I want to open
    File file = new File(attachmentFile);
    Uri uri = FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID, file);
    StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
    StrictMode.setVmPolicy(builder.build());
    intent.putExtra(Intent.EXTRA_STREAM, uri);
    intent.putExtra(android.content.Intent.EXTRA_TEXT, message);
    context.startActivity(Intent.createChooser(intent, "Sending email..."));
    /*
    PackageManager pm = context.getPackageManager();
    if (intent.resolveActivity(pm) != null) {
        context.startActivity(Intent.createChooser(intent, "Sending email..."));
    }
    */
} catch (Throwable t) {
    Log.d(TAG, t.getLocalizedMessage());
}

}