字符串不顯示在android吐司

我一直在努力有兩個edittext字段和兩個spinners的活動。在EditText字段中輸入的文本不會顯示在我生成的祝詞中，即使在spinners中完成了選擇。我究竟做錯了什麼？字符串不顯示在android吐司

package com.goswami.pntgo.notifierdemo; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.*; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Spinner; 
import android.widget.Toast; 

public class LoginScreen extends Activity { 
      String Course = null; 
      String Semester = null; 
      String univRollNo = null; 
      String name = null; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_login_screen); 

    final EditText tvname = (EditText) findViewById(R.id.name); 
    final EditText tvunivrn = (EditText) findViewById(R.id.univ_roll_no); 
    name = tvname.getText().toString(); 
    univRollNo = tvunivrn.getText().toString(); 



    Spinner course = (Spinner)findViewById(R.id.course); 
    Spinner semester = (Spinner)findViewById(R.id.semester); 
    ArrayAdapter cadapter = ArrayAdapter.createFromResource(this,R.array.courses,R.layout.courses); 
    ArrayAdapter sadapter = ArrayAdapter.createFromResource(this,R.array.semesters,R.layout.courses); 

    course.setAdapter(cadapter); 
    semester.setAdapter(sadapter); 

    course.setOnItemSelectedListener(new OnItemSelectedListener(){ 
     @Override 
     public void onNothingSelected(AdapterView<?> parent) { 

     } 

     public void onItemSelected(AdapterView<?> parent, View view, int pos, long id){ 
      Course = parent.getItemAtPosition(pos).toString(); 

     } 

    }); 

    semester.setOnItemSelectedListener(new OnItemSelectedListener() { 
     @Override 
     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
      Semester = parent.getItemAtPosition(position).toString(); 

     } 

     @Override 
     public void onNothingSelected(AdapterView<?> parent) { 

     } 
    }); 

    Button login = (Button)findViewById(R.id.button); 
    login.setOnClickListener(new Button.OnClickListener(){ 
     public void onClick(View v){ 
      Toast.makeText(LoginScreen.this,(name+" Roll No:"+univRollNo+"\n"+Course+" "+Semester),Toast.LENGTH_LONG).show(); 
     } 
    }); 
}

}

來源

2016-07-01 Punit Goswami

你設定的univRollNo內容的事情之前已經進入tvunivrn。

此行添加到您的登錄按鈕OnClickListener的頂部：

univRollNo = tvunivrn.getText().toString();

或者只是規避和提取文本，例如：

Toast.makeText(LoginScreen.this, name + " Roll No:" + tvunivrn.getText().toString() + "\n" + Course + " " + Semester, Toast.LENGTH_LONG).show();

來源

2016-07-01 17:35:12 nukeforum

字符串不顯示在android吐司

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