在不同的活动中将数据从 ListView 传递到 TextView，Android

Question

我正在尝试将一个 ListView 项从我的 MainActivity 传递到一个 TextView 项到 MenuActivity，意图成功地创建了第二个活动，但是当我尝试传递数据时我遇到了问题。 MainActivity.Java 是一个搜索屏幕，在输入时会显示餐厅名称列表，当用户选择餐厅时，会将其带到菜单页面。我希望他们的选择作为菜单标题转移到新活动。

MainActivity.Java

    lv.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {


             Intent myIntent = new Intent(MainActivity.this, MenuActivity.class);

             String listItem = (String) lv.getItemAtPosition(position);
             myIntent.putExtra("restaurant" ,listItem );
             startActivity(myIntent);

        }
      }); // end of lv.setOnItemClickListener

MenuActivity.Java

public class MenuActivity extends ExpandableListActivity {

// textview / menu header
private TextView menuHeader;

// parent list items
private static final String arrGroupElements[] = {"Appetizers", "Main Course", "Desserts",
    "Beverages"};

// strings for child elements
private static final String arrChildElements[][]={
    {"Appetizer 1", "Appetizer 2", "Appetizer 3", "Appetizer 4", "Appetizer 5"},
    {"Main Course 1", "Main Course 2", "Main Course 3", "Main Course 4", "Main Course 5"},
    {"Dessert 1", "Dessert 2", "Dessert 3", "Dessert 4", "Dessert 5"},
    {"Beverage 1", "Beverage 2", "Beverage 3", "Beverage 4", "Beverage 5"}      
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.menu_screen);
    // added code
    setListAdapter(new ExpandableListAdapter(this));

    menuHeader = (TextView) findViewById(R.id.articleHeaderTextView);

    Bundle extras = getIntent().getExtras();
    String searchData = extras.getString("restaurant");


    menuHeader.setText(searchData);

}

Answer 1

试试这个

lv.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View view,
        int position, long id) {


         Intent myIntent = new Intent(MainActivity.this, MenuActivity.class);

         String listItem = (String) lv.getItemAtPosition(position);
         myIntent.putExtra("restaurant" ,listItem );
         startActivity(myIntent);
          setResult(RESULT_OK, intent);

    }
  });

并在菜单活动中覆盖 onactivityresults 方法

    public class MenuActivity extends ExpandableListActivity {

// textview / menu header
private TextView menuHeader;

// parent list items
private static final String arrGroupElements[] = {"Appetizers", "Main Course", "Desserts",
    "Beverages"};

// strings for child elements
private static final String arrChildElements[][]={
    {"Appetizer 1", "Appetizer 2", "Appetizer 3", "Appetizer 4", "Appetizer 5"},
    {"Main Course 1", "Main Course 2", "Main Course 3", "Main Course 4", "Main Course 5"},
    {"Dessert 1", "Dessert 2", "Dessert 3", "Dessert 4", "Dessert 5"},
    {"Beverage 1", "Beverage 2", "Beverage 3", "Beverage 4", "Beverage 5"}      
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.menu_screen);
    // added code
    setListAdapter(new ExpandableListAdapter(this));

    menuHeader = (TextView) findViewById(R.id.articleHeaderTextView);

}
@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       if(resultCode==RESULT_OK)
        {
          String searchData=data.getExtras().getString("restaurant");
          menuHeader.setText(searchData);
         }