Question

根据我的代码，我之后可以选择一个文件，如何在选定目录中保存所选文件？在这里我捕获了Uri但是我无法将该音频文件保存在特定文件夹中。问题出在哪里？我在编写outputStream时遇到了什么错误？

public class Upload extends AppCompatActivity {
    File folder;

    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.splashscreen);

        /* New Handler to start the Menu-Activity
         * and close this Splash-Screen after some seconds.*/
        folder = new File(Environment.getExternalStorageDirectory() + "/Audios");
        File folder1 = new File(Environment.getExternalStorageDirectory() + "/");
        if (!folder.exists()) {
            folder.mkdir();
        }
        for (File f : folder.listFiles()) {
            if (f.isFile()) {
                String name = f.getName();
                // System.out.print(name);
                Toast.makeText(getApplicationContext(), name, Toast.LENGTH_SHORT).show();
            }
            // Do your stuff
        }
        Intent intent_upload = new Intent();
        intent_upload.setType("audio/*");
        intent_upload.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(intent_upload, 1);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == 1) {

            if (resultCode == RESULT_OK) {
                FileInputStream fileInputStream = null;
                //the selected audio.

                Uri uri = data.getData();
                Toast.makeText(getApplicationContext(), uri.getPath(), Toast.LENGTH_SHORT).show();
                File test = new File(uri.getPath());
                try {
                    fileInputStream = new FileInputStream(test);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
                try {
                    FileOutputStream outputStream = new FileOutputStream(folder, true);
                    int bufferSize = 1024;
                    byte[] buffer = new byte[bufferSize];
                    int len = 0;
                    while ((len = fileInputStream.read(buffer)) != -1) {
                        outputStream.write(buffer, 0, len);
                    }

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

}

Answer 1

这不是＆＃34;选择文件＆＃34;。它允许用户选择一段内容。

在onActivityResult()中，如果结果代码为RESULT_OK，则Intent会有Uri指向所选内容。使用ContentResolver和openInputStream()获取该内容的InputStream。从那里，执行您需要执行的操作，例如打开FileOutputStream到某个文件，然后将字节从InputStream复制到OutputStream。

BTW，ACTION_GET_CONTENT不会将Uri作为输入。将setDataAndType()替换为setType()。

需要选择一个文件并将其保存在android中的给定文件夹中

1 个答案: