Android Studio添加了内部存储读取并且判断用户名和密码之后无法跳转到下一个页面，有没有人帮忙看一下的

package com.example.test;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.io.FileInputStream;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

private Button login;
private Button register;
private EditText etname;
private EditText etpwd;

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

    login = (Button) findViewById(R.id.btn_login);
    register = (Button) findViewById(R.id.btn_register);
    etname = (EditText) findViewById(R.id.et_name);
    etpwd = (EditText) findViewById(R.id.et_password);

    login.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String name = etname.getText().toString().trim();
            String pwd = etpwd.getText().toString().trim();
            String content="";
            try {
                FileInputStream fis=this.openFileInput("message.txt");
                byte[] buffer = new byte[fis.available()];
                fis.read(buffer);
                content = new String(buffer);
                Map<String, String> userMap = new HashMap<String, String>();
                String[] infos = content.split("：");
                userMap.put("name", infos[0]);
                userMap.put("pwd", infos[1]);
                fis.close();
                return;
            }catch (Exception e){
                if (name.length() == 0 || pwd.length() == 0) {
                    Toast.makeText(MainActivity.this, "输入不能为空", Toast.LENGTH_SHORT).show();    //弹出一个自动消失的提示框
                    return;
                } else if ((TextUtils.isEmpty(name)) && (TextUtils.isEmpty(pwd))) {
                    //页面跳转延迟线程
                    new Thread() {
                        public void run() {
                            super.run();
                            try {
                                Thread.sleep(500);
                                Intent i = new Intent(MainActivity.this, Activity.class);
                                startActivity(i);
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }
                    }.start();
                }
                Toast.makeText(MainActivity.this, "登陆成功", Toast.LENGTH_SHORT).show();
                return;
            }

        }

        private FileInputStream openFileInput(String s) {
            return null;
        }
    });

    register.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent i = new Intent(MainActivity.this, RegisterActivity.class);
            startActivity(i);
        }
    });
}

}

你把跳转的逻辑判断都写到catch里面去了，不报异常是跑步进去了，要么就写到try里面，要么就写到finally里面