驗證android系統

Question

我需要允許用戶在Android中通過代碼只能輸入數字和小數點

請幫我

InputFilter filter = new InputFilter() {  
     public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { 

      System.out.println("source " + source); 
      System.out.println("dSta " + dstart); 
      System.out.println("dEnd " + dend); 
      System.out.println("Start " + start); 
      System.out.println("End " + end); 

      for (int i = 0; i < source.length(); i++) {  
       if (!Character.isDigit(source.charAt(i))) { 
         System.out.println("Character.isDigit(source.charAt(i)) " + Character.isDigit(source.charAt(i))); 
        return "";    
        } 
       /* if (!Character.isDefined('.')) {   
        return "";    
        } */  
       } 
      return null; 

      } 
     }; 

Answer 1

簡單地設置的inputType您查看您需要validate.For例子對於數字

yourview.setInputType(InputType.TYPE_CLASS_NUMBER); 

爲十進制數

yourview.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL); 

Answer 2

下面是用於驗證的整個代碼...

enter code herepublic class LoginActivity extends AppCompatActivity { 
private static final String TAG = "LoginActivity"; 
private static final int REQUEST_SIGNUP = 0; 

@Bind(R.id.input_email) EditText _emailText; 
@Bind(R.id.input_password) EditText _passwordText; 
@Bind(R.id.btn_login) Button _loginButton; 
@Bind(R.id.link_signup) TextView _signupLink; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_login); 
    ButterKnife.bind(this); 

    _loginButton.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      login(); 
     } 
    }); 

    _signupLink.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // Start the Signup activity 
      Intent intent = new Intent(getApplicationContext(), SignupActivity.class); 
      startActivityForResult(intent, REQUEST_SIGNUP); 
      finish(); 
      overridePendingTransition(R.anim.push_left_in, R.anim.push_left_out); 
     } 
    }); 
} 

public void login() { 
    Log.d(TAG, "Login"); 

    if (!validate()) { 
     onLoginFailed(); 
     return; 
    } 

    _loginButton.setEnabled(false); 

    final ProgressDialog progressDialog = new ProgressDialog(LoginActivity.this, 
      R.style.AppTheme_Dark_Dialog); 
    progressDialog.setIndeterminate(true); 
    progressDialog.setMessage("Authenticating..."); 
    progressDialog.show(); 

    String email = _emailText.getText().toString(); 
    String password = _passwordText.getText().toString(); 

    // TODO: Implement your own authentication logic here. 

    new android.os.Handler().postDelayed(
      new Runnable() { 
       public void run() { 
        // On complete call either onLoginSuccess or onLoginFailed 
        onLoginSuccess(); 
        // onLoginFailed(); 
        progressDialog.dismiss(); 
       } 
      }, 3000); 
} 


@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (requestCode == REQUEST_SIGNUP) { 
     if (resultCode == RESULT_OK) { 

      // TODO: Implement successful signup logic here 
      // By default we just finish the Activity and log them in automatically 
      this.finish(); 
     } 
    } 
} 

@Override 
public void onBackPressed() { 
    // Disable going back to the MainActivity 
    moveTaskToBack(true); 
} 

public void onLoginSuccess() { 
    _loginButton.setEnabled(true); 
    finish(); 
} 

public void onLoginFailed() { 
    Toast.makeText(getBaseContext(), "Login failed", Toast.LENGTH_LONG).show(); 

    _loginButton.setEnabled(true); 
} 

public boolean validate() { 
    boolean valid = true; 

    String email = _emailText.getText().toString(); 
    String password = _passwordText.getText().toString(); 

    if (email.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) { 
     _emailText.setError("enter a valid email address"); 
     valid = false; 
    } else { 
     _emailText.setError(null); 
    } 

    if (password.isEmpty() || password.length() < 4 || password.length() > 10) { 
     _passwordText.setError("between 4 and 10 alphanumeric characters"); 
     valid = false; 
    } else { 
     _passwordText.setError(null); 
    } 

    return valid; 
} 

}