在android中使用seterror方法验证edittext

Question

我有两个用于用户名和密码的edittext，我使用seterror方法显示错误，当它们都是空的。问题是当错误消息弹出在第二个字段密码字段），部分信息丢失。此错误仅适用于较旧的设备。如何确保错误不会发生在较旧的设备中。

我的代码：

public class SignInPage extends Activity { 

    EditText txtusername,txtpassword; 
    Button btnlogin; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.signinpage); 
     txtusername=(EditText) findViewById(R.id.txtusername); 
     txtpassword=(EditText) findViewById(R.id.txtpassword); 
     btnlogin=(Button) findViewById(R.id.btnlogin); 
     btnlogin.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       if(txtusername.getText().toString().trim().equals("")) 
       { 
        txtusername.setError("Username is mandatory"); 
        txtusername.requestFocus(); 
       } 
       if(txtpassword.getText().toString().trim().equals("")) 
       { 
        txtpassword.setError("Password is mandatory"); 
        txtpassword.requestFocus(); 
       } 
       else 
       { 
        Toast.makeText(getApplicationContext(),"Checking with server",Toast.LENGTH_LONG).show(); 
       } 
      } 
     }); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

} 

Answer 1

试试这个它可以帮助您

fname = FirstName.getText().toString().trim(); 
if(fname.isEmpty()) //&& fname.matches("[a-zA-Z ]+")) 
      { 
       FirstName.requestFocus(); 
       FirstName.setError(Html.fromHtml("<font color='red'>Please enter the First name</font>")); 
      } 
TextWatcher textWatcher = new TextWatcher() { 

     @Override 
     public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) 
     { } 

     @Override 
     public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) 
     { } 

     @Override 
     public void afterTextChanged(Editable arg0) 
     { 
      if(arg0.toString().isEmpty()) 
      { 
       return; 
      } 

      if (FirstName.getText() == arg0) { 
       Validate(FirstName); 
FirstName.addTextChangedListener(textWatcher); 

public void Validate(EditText et) {  
    et.setError(null); 
}