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C-/C++-Quelltext

    public void MB(CharSequence text) {
        Toast.makeText(this, text, Toast.LENGTH_LONG).show();
        Log.d("Message", text.toString());
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Log.e("Message", "Log Start...");

        MB(Environment.isExternalStorageEmulated() ? "true" : "false");
        MB(Environment.getExternalStorageState());

        File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS);
        MB(path.toString());

        path.mkdir();

        MB(path.isDirectory() ? "true" : "false");

        File file = new File(path, "test.txt");
        MB(file.toString());

        try {
            OutputStream os = new FileOutputStream(file);
            String s = "hallo du da";

            os.write(s.getBytes());
            os.close();

        } catch (FileNotFoundException e) {
            MB(e.toString());
        } catch (IOException e) {
            MB(e.toString());
        }

        try {
            InputStream is = new FileInputStream(file);
            StringBuilder builder = new StringBuilder();
            int ch;
            while((ch = is.read()) != -1){
                builder.append((char)ch);
            }
            MB(builder.toString());
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        Log.e("Message", "Log End");
    }