Question

您好我想将方法veikia（）中的值“valuey”传递给方法 checkButtonClick（）。我是Java的新手，很抱歉，如果这个问题已经得到解答，因为我不明白：）

度过愉快的一天：）

这是我的代码：

public class ListViewCheckboxesActivity extends Activity {

    MyCustomAdapter dataAdapter = null;
    PrekesDBController controller = new PrekesDBController(this);

    //private Context mContext;
    ScrollView sv;
    TextView infotext;
    CheckBox check;
    LinearLayout ll;
    Spinner spinner2;


    @Override
    public void onCreate(Bundle savedInstanceState) {
       // mContext = this;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main123);

       // mContext = this;


        //Generate list View from ArrayList
        displayListView();

        checkButtonClick();

        veikia();

    }


  public String veikia() {
      ArrayList<HashMap<String, String>> data2 = controller.getpavadinimas();
      String valuey = "";
      for (int kl = 0; kl < data2.size(); kl++) {
          spinner2 = (Spinner) findViewById(R.id.spinner11);

          ScrollView sv = (ScrollView) findViewById(R.id.myscroll123);
          LinearLayout ll = (LinearLayout) findViewById(R.id.mylinearLayout123);

          LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
          View view = inflater.inflate(R.layout.naujasuzsakymailist123, null);


          ll.addView(view);

          //sikna = int kl;
          Spinner jopapa = new Spinner(this);
          jopapa = (Spinner) findViewById(R.id.spinner11);
          jopapa.setId(kl);

          List<String> list = new ArrayList<String>();
          list.add("1");
          list.add("2");
          list.add("3");
          list.add("4");
          list.add("5");
          list.add("6");
          list.add("7");
          list.add("8");
          list.add("9");
          list.add("10");
          ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                  android.R.layout.simple_spinner_item, list);
          dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
          jopapa.setAdapter(dataAdapter);
          valuey = String.valueOf(jopapa.getSelectedItem());
          System.out.println(valuey);
      }


     return valuey;
  }

    public void checkButtonClick() {


        Button myButton = (Button) findViewById(R.id.findSelected);
        myButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                StringBuffer responseText = new StringBuffer();
                responseText.append("The following were selected...\n");

                ArrayList<Country> countryList = dataAdapter.countryList;
                for(int i=0;i<countryList.size();i++){
                    Country country = countryList.get(i);
                    if(country.isSelected()){
                        responseText.append("\n" + country.getName());
                    }
                }

                Toast.makeText(getApplicationContext(),
                        responseText, Toast.LENGTH_LONG).show();

            }
        });

    }

}

Answer 1

调用它时，只需将veikia()的返回值传递给checkButtonClick()：

public String veikia() {
    ...
    return valuey;
}

// Added parameter valuey
public void checkButtonClick(String valuey) {
    ...
}

@Override
public void onCreate(Bundle savedInstanceState) {
    ...
    // Call checkButtonClick() with the parameter valuey returned from veikia()
    checkButtonClick(veikia());
}

Answer 2

更改checkButtonClick方法的签名：

public void checkButtonClick(){...}

为：

public void checkButtonClick(String myString) { 
  // Use the value of myString here
}

然后使用onCreate方法，而不是调用：

checkButtonClick();

veikia();

以相反的顺序调用函数，例如：

String valuey = veikia();
checkButtonClick(valuey)

修改

要从您覆盖的方法内部访问valuey，例如OnClickListener.onClick(View v)，您必须将valuey定义为成员变量。最终结果看起来像这样：

public class ListViewCheckboxesActivity extends Activity implements View.OnClickListener { private String valuey; @Override protected void onCreate(Bundle savedInstanceState) { // ... valuey = veikia(); } @Override public void onClick(View view) { // do something with valuey, for example print it to the logger Log.d("TAG", valuey); } }

如何将值从一个函数传递到另一个函数

2 个答案: