android 文件内容和 textview 操作

public class CreateFile extends Activity {

    private BufferedReader reader;

    private TextView tvFileReader;



    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        tvFileReader = (TextView) findViewById(R.id.tvFileReader);

        String path = Environment.getExternalStorageDirectory()

                .getAbsolutePath() + "/hadatabase/";

        File fileDir = new File(path);

        // 如果目录不存在就新建目录

        if (!fileDir.exists()) {

            if (!fileDir.mkdirs()) {

                Log.i("创建目录", "创建目录失败，请检查是否有sdcard读写权限。");

            }

        }

        // 获取 textview 内容

        String str = tvFileReader.getText().toString().trim();

        try {

            FileWriter fw = new FileWriter(path + "bb.txt");

            fw.flush();

            fw.write(str); // 把textview 内容写入到bb.txt文件

            fw.close();

        } catch (Exception e) {

            e.printStackTrace();

        }



        File readerFile = new File(path + "/bb.txt");

        try {

            reader = new BufferedReader(new FileReader(readerFile));

            String tempString = null;

            while ((tempString = reader.readLine()) != null) {

                // 把bb.txt文件里的内容添加到 TextView 里

                tvFileReader.append(tempString); 

            }

            reader.close();

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            if (reader != null) {

                try {

                    reader.close();

                } catch (Exception e2) {

                    e2.printStackTrace();

                }

            }

        }

    }

}