如何以及在何处在AlertDialog中的editText中添加setError

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0
package alonso.radiobuttonquiz;

    import android.content.Context;
    import android.content.DialogInterface;
    import android.content.Intent;
    import android.content.SharedPreferences;
    import android.preference.PreferenceManager;
    import android.support.v7.app.AlertDialog;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageButton;
    import android.widget.TextView;

    public class HomePage extends AppCompatActivity {
      TextView tV1,tV2;
    SharedPreferences sp;
    ImageButton btn;
    Button button;
    //alert dialog box
    final Context c = this;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home_page);
        tV1 = (TextView) findViewById(R.id.totalcoin);
        tV2 = (TextView)findViewById(R.id.nameDisplay);
        btn = (ImageButton) findViewById(R.id.startQuiz);


        SharedPreferences preferences = 
    PreferenceManager.getDefaultSharedPreferences(this);
        Integer coin = preferences.getInt("coin", 0);
        tV1.setText("COIN: " + coin);


        final SharedPreferences prefs = 
    PreferenceManager.getDefaultSharedPreferences(this);
        final SharedPreferences.Editor editor = prefs.edit();
        final String username = prefs.getString("USERNAME", "");
        prefs.getString("USERNAME","");
        tV2.setText(username);



        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(HomePage.this, LvlMenu.class);
                startActivity(intent);
                finish();


            }
        });


        LayoutInflater layoutInflaterAndroid = LayoutInflater.from(c);
        View mView = 
     layoutInflaterAndroid.inflate(R.layout.activity_login2,null);
        final AlertDialog.Builder alertDialogBuilderUserInput = new 
    AlertDialog.Builder(c,R.style.AlertDialogTheme);

        alertDialogBuilderUserInput.setView(mView);

        final EditText userInputDialogEditText = (EditText) 
    mView.findViewById(R.id.userInputDialog);
        alertDialogBuilderUserInput
                .setCancelable(false)
                .setPositiveButton("LOGIN", new 
    DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialogBox, int id) {
                        String username = 
    userInputDialogEditText.getText().toString();
                        editor.putString("USERNAME",username);
                        editor.apply();
                        tV2.setText(username);
                }});

        AlertDialog alertDialogAndroid = alertDialogBuilderUserInput.create();
        alertDialogAndroid.show();
     }
}

当alertDialog中的editText为空时,在哪里添加setError?如果可能,请编辑我的代码,以便在用户从不在editText中输入任何字母时添加setError ..谢谢!这是测验应用程序中的登录屏幕...真的希望你们都可以伸出援助之手,因为我已经工作了好几个小时......

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1回答

  • 1
    LayoutInflater layoutInflaterAndroid = LayoutInflater.from(this);
        View mView =
                layoutInflaterAndroid.inflate(R.layout.activity_login2,null);
        final AlertDialog.Builder alertDialogBuilderUserInput = new
                AlertDialog.Builder(this,R.style.AlertDialogTheme);
    

    alertDialogBuilderUserInput.setPositiveButton(“Ok”,null);

    final EditText userInputDialogEditText = (EditText)
                mView.findViewById(R.id.userInputDialog);
        alertDialogBuilderUserInput.setView(mView);
        AlertDialog alertDialogAndroid = alertDialogBuilderUserInput.create();
        alertDialogAndroid.show();
    
        alertDialogAndroid.setOnShowListener(new DialogInterface.OnShowListener() {
    
            @Override
            public void onShow(DialogInterface dialogInterface) {
    
                Button button = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
                button.setOnClickListener(new View.OnClickListener() {
    
                    @Override
                    public void onClick(View view) {
                        // TODO Do something
                        if(userInputDialogEditText.getText().toString().equals("")){
                            userInputDialogEditText.setError("Enter Username");
                        }else {
                            String username =
                                    userInputDialogEditText.getText().toString();
                            editor.putString("USERNAME",username);
                            editor.apply();
                            tV2.setText(username);
                            dialog.dismiss();
                        }
                    }
                });
            }
        });
    alertDialogAndroid.show();
    

    希望这能帮到你...如果你需要任何帮助,你可以问

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