Spinner-如何获得价值？ Android Studio

如何解决Spinner-如何获得价值？ Android Studio

我想将表单中的值插入数据库。我在微调器的值方面遇到问题，并且做错了，因为当我打算进行下一个表单是应用程序的活动时，就会停止。我将非常感激。

MainActivity.java

public class MainActivity extends AppCompatActivity {

EditText UsernameEt,PasswordEt;

private static Button btnLogin;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    UsernameEt = (EditText) findViewById(R.id.etUserName);
    PasswordEt = (EditText) findViewById(R.id.etPassword);
    OnClickButtonListener();


}
public void OnClickButtonListener() {
    btnLogin = (Button) findViewById(R.id.btnLogin);
    btnLogin.setonClickListener(
            new View.OnClickListener() {
                public void onClick(View v) {
                    Intent intent = new Intent(".SecondPan");
                    startActivity(intent);
                }
            }
    );
}



public void OnLogin(View view)
{
    String username = UsernameEt.getText().toString();
    String password = PasswordEt.getText().toString();
    String type = "login";
    BackgroundWorker backgroundWorker = new BackgroundWorker(this);
    backgroundWorker.execute(type,username,password);


}
public void OpenReg(View view){
    startActivity(new Intent(this,Register.class));
}

}

第二个面板，应在其中定位用户，以及微调器在哪里：

public class SecondPan extends AppCompatActivity implements AdapterView.OnItemClickListener {
private Spinner sspnoption6,sspn2;
private TextView ttxOption6,ttx;
EditText umowa,nazwa,kategorie,opis,zabezpieczenia,dane;
String czy_dane,transfer;



@SuppressLint("CutPasteId")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second_pan);

    Spinner sspn2 = (Spinner)findViewById(R.id.sspn);
     czy_dane = sspn2.getSelectedItem().toString();
    Spinner sspnoption6 = (Spinner)findViewById(R.id.sspn2);
     transfer = sspnoption6.getSelectedItem().toString();


    umowa = (EditText) findViewById(R.id.scnd_txt1);
    nazwa = (EditText) findViewById(R.id.scnd_txt2);
    kategorie = (EditText) findViewById(R.id.scnd_txt3);
    opis = (EditText) findViewById(R.id.scnd_tx4);
    zabezpieczenia = (EditText) findViewById(R.id.scnd_tx6);
    dane = (EditText) findViewById(R.id.scnd_tx7);


    sspnoption6 = findViewById(R.id.sspn);

    ArrayAdapter<CharSequence> FirstAdapter = ArrayAdapter.createFromresource(this,R.array.tab1,android.R.layout.simple_spinner_item);
    FirstAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    sspn2=findViewById(R.id.sspn2);
    ArrayAdapter<CharSequence> Secondadapter = ArrayAdapter.createFromresource(this,R.array.transfer,android.R.layout.simple_spinner_item);
    Secondadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    sspn2.setAdapter(Secondadapter);


}
public void onItemClick(AdapterView<?> parent,View view,int position,long l) {
    String text = parent.getItemAtPosition(position).toString();
    Toast.makeText(parent.getContext(),text,Toast.LENGTH_SHORT).show();

}

public void OnInsert(View view ) {
    String str_czy_dane = sspn2.getSelectedItem().toString();
    String str_umowa = umowa.getText().toString();
    String str_nazwa = nazwa.getText().toString();
    String str_kategorie = kategorie.getText().toString();
    String str_opis = opis.getText().toString();
    String str_transfer  = sspn2.getSelectedItem().toString();
    String str_zabezpieczenia = zabezpieczenia.getText().toString();
    String str_dane = dane.getText().toString();
    String type = "insert";
    BackgroundWorker backgroundWorker = new BackgroundWorker(this);
    backgroundWorker.execute(type,str_czy_dane,str_umowa,str_nazwa,str_kategorie,str_opis,str_transfer,str_zabezpieczenia,str_dane);
}

}

有一个用于发布数据的脚本： BackgroundWorker.java

else if(type.equals("insert")){
        try {
            String umowa = params[1];
            String czy_dane = params[2];
            String nazwa = params[3];
            String kategorie = params[4];
            String opis = params[5];
            String transfer = params[6];
            String zabezpieczenia = params[7];
            String dane = params[8];

            URL url = new URL (insert_url);
            HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            OutputStream outputStream = httpURLConnection.getoutputStream();
            BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
            String post_data = URLEncoder.encode("czy_dane","UTF-8")+"="+URLEncoder.encode(czy_dane,"UTF-8")+"&"+
                    URLEncoder.encode("umowa","UTF-8")+"="+URLEncoder.encode(umowa,"UTF-8")+"&"
            +URLEncoder.encode("nazwa","UTF-8")+"="+URLEncoder.encode(nazwa,"UTF-8")+"&"
            +URLEncoder.encode("kategorie","UTF-8")+"="+URLEncoder.encode(kategorie,"UTF-8")+"&"
            +URLEncoder.encode("opis","UTF-8")+"="+URLEncoder.encode(opis,"UTF-8")+"&"
            +URLEncoder.encode("transfer","UTF-8")+"="+URLEncoder.encode(transfer,"UTF-8")+"&"
            +URLEncoder.encode("zabezpieczenia","UTF-8")+"="+URLEncoder.encode(zabezpieczenia,"UTF-8")+"&"
                    +URLEncoder.encode("dane","UTF-8")+"="+URLEncoder.encode(dane,"UTF-8");
            bufferedWriter.write(post_data);
            bufferedWriter.flush();
            bufferedWriter.close();
            outputStream.close();
            InputStream inputStream = httpURLConnection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1")) ;
            String result="";
            String line="";
            while((line = bufferedReader.readLine())!=null) {
                result+= line;
            }
            bufferedReader.close();
            inputStream.close();
            httpURLConnection.disconnect();
            return result;
        } catch (MalformedURLException e) {
            e.printstacktrace();
        } catch (IOException e) {
            e.printstacktrace();
        }


    }
    return null;

解决方法

在您的代码中，您两次分配了Spinner。

Spinner sspn2 = (Spinner)findViewById(R.id.sspn); /// FIRST SPINNER 1 time
czy_dane = sspn2.getSelectedItem().toString();

Spinner sspnOption6 = (Spinner)findViewById(R.id.sspn2);/// SECOND SPINNER 1 time
transfer = sspnOption6.getSelectedItem().toString();


    umowa = (EditText) findViewById(R.id.scnd_txt1);
    nazwa = (EditText) findViewById(R.id.scnd_txt2);
    kategorie = (EditText) findViewById(R.id.scnd_txt3);
    opis = (EditText) findViewById(R.id.scnd_tx4);
    zabezpieczenia = (EditText) findViewById(R.id.scnd_tx6);
    dane = (EditText) findViewById(R.id.scnd_tx7);


sspnOption6 = findViewById(R.id.sspn); /// FIRST SPINNER 2 time


ArrayAdapter<CharSequence> FirstAdapter = ArrayAdapter.createFromResource(this,R.array.tab1,android.R.layout.simple_spinner_item);
    FirstAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

sspn2=findViewById(R.id.sspn2);   /// SECOND SPINNER 2 time



ArrayAdapter<CharSequence> Secondadapter = ArrayAdapter.createFromResource(this,R.array.transfer,android.R.layout.simple_spinner_item);
    Secondadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    sspn2.setAdapter(Secondadapter);

解决方案：

Spinner sspn2 ; 

Spinner sspnOption6 ; 

    umowa = (EditText) findViewById(R.id.scnd_txt1);
    nazwa = (EditText) findViewById(R.id.scnd_txt2);
    kategorie = (EditText) findViewById(R.id.scnd_txt3);
    opis = (EditText) findViewById(R.id.scnd_tx4);
    zabezpieczenia = (EditText) findViewById(R.id.scnd_tx6);
    dane = (EditText) findViewById(R.id.scnd_tx7);


sspnOption6 = findViewById(R.id.sspn); 
 ArrayAdapter<CharSequence> FirstAdapter = new ArrayAdapter<CharSequence>(this,android.R.layout.simple_spinner_item,getResources()
                .getStringArray(R.array.tab1));
                FirstAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sspnOption6.setAdapter(FirstAdapter);
    
    
sspn2=findViewById(R.id.sspn2);  
 ArrayAdapter<CharSequence> Secondadapter = new ArrayAdapter<CharSequence>(this,getResources()
                .getStringArray(R.array.transfer));
                Secondadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);   
sspn2.setAdapter(Secondadapter);
    
    
    czy_dane = sspn2.getSelectedItem().toString();
    transfer = sspnOption6.getSelectedItem().toString();