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我想附加一个位于 data/data/com.example.XXXX/files/THISFILE.txt 中的文件

但首先我应该将它导出到 SD 以便附加它，我在下面有这段代码但没有创建“hello.txt”文件。所以我不能附加它。

public class exportar extends Activity {


String from = "/data/data/com.example.XXXXXX/files/THISFILE.txt";
String to = "/sdcard/hello.txt";


public static boolean copyFile(String from, String to) {
    try {
        int bytesum = 0;
        int byteread = 0;
        File oldfile = new File(from);
        if (oldfile.exists()) {
            InputStream inStream = new FileInputStream(from);
            FileOutputStream fs = new FileOutputStream(to);
            byte[] buffer = new byte[1444];
            while ((byteread = inStream.read(buffer)) != -1) {
                bytesum += byteread;
                fs.write(buffer, 0, byteread);
            }
            inStream.close();
            fs.close();
        }
        return true;
    } catch (Exception e) {
        return false;
    }
}



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);




   Intent i = new Intent(Intent.ACTION_SEND);
    i.setType("message/rfc822");
    i.putExtra(Intent.EXTRA_SUBJECT,"XXX");
    i.putExtra(Intent.EXTRA_TEXT   , ("XXX"));


     String file = "file://" + Environment.getExternalStorageDirectory()+"/hello.txt";


    Uri uri = Uri.parse(file);
    i.putExtra(Intent.EXTRA_STREAM, uri);



    finish();
    try {
        startActivity(Intent.createChooser(i, "xxxx."));



    } catch (android.content.ActivityNotFoundException ex) {


        finish();
    }
}
}

任何建议将不胜感激。

已编辑 1

我改变了

String from = "/data/data/com.example.XXXXXX/files/THISFILE.txt";
String to = "/sdcard/hello.txt";

至

File ruta_data = Environment.getDataDirectory();
File from = new File(ruta_data.getAbsolutePath(), "com.example.aa/files/THISFILE.txt");


File ruta_sd = Environment.getExternalStorageDirectory();
File to = new File(ruta_sd.getAbsolutePath(), "Hello.txt");

我放 getDataDirectory()是因为它在 data/data/ 但我不知道如果它是 n data/data/com.example.aa/files/THISFILE.txt 我该怎么办

如果我想将它复制到 SD 的根目录，ruta_sd 是否正确？

4

0 回答 0