Question

每当我启动我的应用程序时，即使是现在创建了文件的新模拟器，它仍会执行一些代码，即如果文件已经创建了这个意图，我不明白，它不应该，我没有办法测试，因为我有一部iPhone而不是Android手机，理论上代码不应该被调用，只是第二次加载应用程序。

谢谢！

代码：

Public class LogIn extends Activity implements OnClickListener {
    Button send;
    EditText user;
    EditText pass;
    CheckBox staySignedIn;
    FileOutputStream Fos;
    String a;
    String b;
    String string = a;
    String string2 = b;
    String DANNYISREALLLLYYYGAAYYYYYIMNOTBS;

    String FILENAME = "userandpass";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        send = (Button) findViewById(R.id.bLogIn);
        user = (EditText) findViewById(R.id.eTuser);
        pass = (EditText) findViewById(R.id.eTpassword);
        staySignedIn = (CheckBox) findViewById(R.id.Cbstay);
        send.setOnClickListener(this);
        File file = getBaseContext().getFileStreamPath(FILENAME);
        if (file.exists());
        Intent i = new Intent(LogIn.this, ChatService.class);
        startActivity(i);}      


    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.bLogIn:
            if (pass.length() == 0)
                Toast.makeText(this,
                        "Try to type in your username and password again!",
                        Toast.LENGTH_LONG).show();
            else if (user.length() == 0)
                Toast.makeText(this,
                        "Try to type in your username and password again!",
                        Toast.LENGTH_LONG).show();
             {
                 if (staySignedIn.isChecked()) {

                String a = user.getText().toString();
                String b = pass.getText().toString();
                File f = new File(FILENAME);
                try {
                    Fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
                    if (Fos != null) {
                    Fos.write(a.getBytes());
                    Fos.write(b.getBytes());
                    }
                    Fos.close();
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }finally  {
                        String u = user.getText().toString();
                        String p = pass.getText().toString();
                        Bundle send = new Bundle();
                        send.putString("key", u);
                        send.putString("key1", p);
                        Intent c = new Intent(LogIn.this, logincheck.class);
                        c.putExtra("key", u);
                        c.putExtra("key1", p);
                        startActivity(c);
                        Toast.makeText(this, "Were signing you in!", Toast.LENGTH_LONG)
                                .show();
                        if (!staySignedIn.isChecked()) {
                            finish();

                        break;
                        }
                }
                 }
             }





            }
        }
    }

Answer 1

测试后你有一个分号： if (file.exists()); 如果条件为真，则将其视为要运行的块。只需删除分号就可以了。

Answer 2

正如jbowes所说，删除分号没有任何意义，你的应用程序应该崩溃如果你有这样的代码

if (file.exists())
{
        Intent i = new Intent(LogIn.this, ChatService.class);
        startActivity(i);
}

如果它仍然崩溃告诉我抛出什么异常

应用程序绕过登录屏幕，即使它不应该

2 个答案: