基于三个微调器的输入，从一项活动转移到另一项活动

Question

我的活动中有3个微调器，因此，如果我在第二个微调器中的第一个微调器“ cse”中输入了“ 1”，在第三个微调器中输入了“ b”，则必须基于三个微调器的输入来打开特定活动我必须打开受人尊敬的活动，等等，以进行不同的组合。帮帮我！

我曾尝试使用if statemnts，此后每次应用程序都崩溃。

请注意代码中的注释，那些是我尝试过并没有得到任何结果的代码。

`public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener{
private Button  btn;
/*TextView selection1;
TextView selection2;
TextView selection3;*/
Spinner spin1;
Spinner spin2;
Spinner spin3;

String[] years = {"1","2","3","4"};
String[] branches = {"CSE","ECE","EEE","CIVIL","IT","MECH"};
String[] sections = {"A","B","C"};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Spinner spin1 = (Spinner) findViewById(R.id.spinner1);

    spin1.setOnItemSelectedListener(this);

    /*List<String> branches = new ArrayList<String>();
    branches.add("CSE");
    branches.add("ECE");
    branches.add("IT");
    branches.add("MECH");
    branches.add("CIVIL");
    branches.add("EEE");*/

    ArrayAdapter<String> dataAdapter =new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,years);

    //Drop down layout style - list view with radio button
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    //attaching dataAdapter to spinner
    spin1.setAdapter(dataAdapter);

    Spinner spin2 = (Spinner) findViewById(R.id.spinner2);
    spin2.setOnItemSelectedListener(this);
    ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,branches);
    dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spin2.setAdapter(dataAdapter2);

    Spinner spin3 = (Spinner) findViewById(R.id.spinner3);
    spin3.setOnItemSelectedListener(this);
    ArrayAdapter<String> dataAdapter3 = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,sections);
    dataAdapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spin3.setAdapter(dataAdapter3);

    Button btn= (Button) findViewById(R.id.display);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            displaycheck();
        }
    });
}
public void displaycheck(){
    /*Spinner s1 = (Spinner)findViewById(R.id.spinner1);
    Spinner s2 = (Spinner)findViewById(R.id.spinner2);
    Spinner s3 = (Spinner)findViewById(R.id.spinner3);

    String sp1 = s1.getPrompt().toString();
    String sp2 = s2.getPrompt().toString();
    String sp3 = s3.getPrompt().toString();

    if (sp1.equals("3")&&sp2.equals("CSE")&&sp3.equals("B")){*/
    Toast.makeText(this, "Welcome", Toast.LENGTH_LONG).show();
    Intent it = new Intent(this,M2.class);
    startActivity(it);
    //}
    /*else{
        Toast.makeText(this, "Invalid input", Toast.LENGTH_LONG).show();
    }*/
}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    //on selecting a spinner item
    String item = parent.getItemAtPosition(position).toString();
    /*if (spin1.getSelectedItem().toString().equals("3")) {
        if (spin2.getSelectedItem().toString().equals("CSE")) {
            if (spin3.getSelectedItem().toString().equals("B")) {*/
    Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();
                /*Intent it = new Intent(this, M2.class);
                startActivity(it);*/
}

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

}

    /*Button btn =(Button)findViewById(R.id.display);
    btn.setOnClickListener(new View.OnClickListener(){
                               @Override
                               public void onClick(View v){
                                   displaycheck();
                               }
                           }
    );
}

public void displaycheck(){
    Spinner s1 =(Spinner) findViewById(R.id.spinner1);
    Spinner s2 = (Spinner) findViewById(R.id.spinner2);
    Spinner s3 = (Spinner) findViewById(R.id.spinner3);
    String ye = y.getText().toString();
    String br = b.getText().toString();
    String se = s.getText().toString();
    if (ye.equals("3")&&br.equals("cse")&&se.equals("b")) {
        Toast.makeText(this, "ra ra ", Toast.LENGTH_LONG).show();
        Intent it = new Intent(this, M2.class);
        startActivity(it);
    }
    else{
        Toast.makeText(this, "po po", Toast.LENGTH_LONG).show();
    }
}*/

}`

Answer 1

要从微调器中选择项目，请使用此

String value1 = s1.getSelectedItem().toString();
String value2 = s2.getSelectedItem().toString();
String value3 = s3.getSelectedItem().toString();

现在您可以检查值

if(value1.equals("a") && value2.equals("cse") && value3.equals("b"))
   openActivityCodeHere();