外部存储读写文件1.doc

package com.itxm.rwfromram; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStreamReader; import android.os.Bundle; import android.os.Environment; import android.app.Activity; import android.view.View; import android.widget.CheckBox; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends Activity { private EditText et_name; private EditText et_pass; private CheckBox cb; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et_name = (EditText) findViewById(R.id.et_name); et_pass = (EditText) findViewById(R.id.et_pass); cb = (CheckBox) findViewById(R.id.cb); // 读取用户名和密码 readNameAndPass(); } public void login(View v) { // 判断记住用户名和密码是否选中 if (cb.isChecked()) { // 保存用户名和密码 saveNameAndPass(); } Toast.makeText(this, 登录成功, 0).show(); } /** * 保存用户名和密码 */ private void saveNameAndPass() { if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { String name = et_name.getText().toString(); String pass = et_pass.getText().toString(); File file = new File(Environment.getExternalStorageDirectory(), info.txt); try { FileOutputStream fos = new FileOutputStream(file); fos.write((name + ## + pass).getBytes()); fos.close(); } catch (Exception e) { e.printStackTrace(); } }else { Toast.makeText(this, sd卡不存在哦！, 0).show(); } } /** * 读取用户名和密码 */ private void readNameAndPass() { if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { File file = new File(Environment.getExternalStorageDirectory(), info.txt); if (file.exists()) { try { FileInputStream fis = new FileInputStream(file); BufferedReader br = new BufferedReader( new InputStreamReader(fis)); String string = br.readLine();