java - 在外部类中使用微调器，因为所有其他 Activity 都需要

Question

我的问题是如何将我的微调器放入外部 java 类中并在所有其他 Activity 中实现它(作为菜单)，这是我的微调器代码:

final Spinner spinner = (Spinner) findViewById(R.id.comboCasino);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.comboCasino, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        spinner.setSelection(0, false);
        // this will be called when you select any item in this spinner
        spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View arg1, int position, long arg3) {
                // get the text at that position
                switch(position) {
                case 0: {
                    Intent NewPost = new Intent(getApplicationContext(), StartingPoint.class);
                    startActivity(NewPost);
                    break; }
                case 1: {
                    Intent NewPost = new Intent(getApplicationContext(), Simmering.class);
                    startActivity(NewPost); 
                    break; }
                case 2: {
                    Intent NewPost = new Intent(getApplicationContext(), LugnerCity.class);
                    startActivity(NewPost);
                    break; }
                case 3: {
                    Intent NewPost = new Intent(getApplicationContext(), Gmunden.class);
                    startActivity(NewPost);
                    break;}
                case 4: {
                    Intent NewPost = new Intent(getApplicationContext(), Salzburg.class);
                    startActivity(NewPost);
                    break; }
                case 5: {
                    Intent NewPost = new Intent(getApplicationContext(), Linz.class);
                    startActivity(NewPost);
                    break; }
                case 6: {
                    Intent NewPost = new Intent(getApplicationContext(), Saalbach.class);
                    startActivity(NewPost);
                    break; }
                case 7: {
                    Intent NewPost = new Intent(getApplicationContext(), Innsbruck.class);
                    startActivity(NewPost); 
                    break;}
                case 8: {
                    Intent NewPost = new Intent(getApplicationContext(), Reutte.class);
                    startActivity(NewPost);
                    break; }
                case 9: {
                    Intent NewPost = new Intent(getApplicationContext(), Bregenz.class);
                    startActivity(NewPost); 
                    break; }
                case 10: {
                    Intent NewPost = new Intent(getApplicationContext(), Kufstein.class);
                    startActivity(NewPost);
                    break; }
                case 11: {
                    Intent NewPost = new Intent(getApplicationContext(), Bratislava.class);
                    startActivity(NewPost);
                    break; }
                }       
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
                // TODO Auto-generated method stub  
            }
        });

它应该保存在例如menu.java中，并且应该在每个 Activity 中调用，我如何正确地做到这一点？预先感谢您。

Answer 1

如果您的所有 Activity 都有相同的菜单，则最好的方法是创建一个扩展 Activity 的父类(super class)，并让所有其他 Activity 扩展此 Activity 。

public class BaseActivity extends Activity { // menu code  }

public class StartingPoint extends BaseActivity { //... }