android - 将相同的上下文菜单添加到多个 Activity

Question

我正在尝试弄清楚如何在多个 Activity 中包含通用代码段。

更具体地说，我有一个上下文菜单，我想将其包含在多个 Activity 中。我看到了这个，但只是不明白如何扩展到多个 Activity 。 http://developer.android.com/guide/topics/ui/menus.html

我将其设置为 Menu.java

    public class Menu extends Activity{

    // bottom menus
    public static final int Menu1 = 1;
    public static final int Menu2 = 2;
    public static final int Menu3 = 3;
    public static final int Menu4 = 4;
    public static final int Menu5 = 5;
    public static final int Menu6 = 6;
    public static final int Menu7 = 7;


    // / Creates the menu items
    public boolean onCreateOptionsMenu(Menu menu) {

        menu.add(0, Menu3, 0, "Create Profile").setIcon(
                this.getResources().getDrawable(R.drawable.ic_menu_add));
        menu.add(0, Menu5, 0, "Log In").setIcon(
                this.getResources().getDrawable(R.drawable.ic_menu_login));
        menu.add(0, Menu2, 0, "Settings").setIcon(
                this.getResources().getDrawable(R.drawable.ic_menu_preferences));
        menu.add(0, Menu4, 0, "About").setIcon(
                this.getResources().getDrawable(R.drawable.ic_menu_help));
        menu.add(0, Menu1, 0, "Report A Bug").setIcon(
                this.getResources().getDrawable(R.drawable.ic_menu_start_conversation));
        menu.add(0, Menu6, 0, "New Stuff").setIcon(
                this.getResources().getDrawable(R.drawable.ic_menu_view));
        return true;
    }



    private MenuItem add(int i, int menu32, int j, String string) {
        // TODO Auto-generated method stub
        return null;
    }



    // Handles item selections from preference menu
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case Menu1:
            startActivity(new Intent(this, Bug.class));
            return true;
        case Menu2:
            startActivity(new Intent(this, EditPreferences.class));
            return true;
        case Menu3:
            startActivity(new Intent(this, CreateAccount.class));
            return true;
        case Menu4:
            startActivity(new Intent(this, About.class));
            return true;
        case Menu5:
            startActivity(new Intent(this, Login.class));
            return true;
        case Menu6:
            startActivity(new Intent(this, NewAdditions.class));
            return true;
        }

        return false;
    }


}

Answer 1

如果您想在超过 1 个 Activity 中添加相同的功能而不是创建 1 个通用 Activity 像 BaseActivity 并扩展该 Activity 将在您继承的所有 Activity 中包含该通用功能

例如我调用了checklogin函数，你可以把你的菜单代码放在这里，

public class BaseActivity extends Activity {

      @Override
     protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     settings = getSharedPreferences(PREFS_NAME, 0);
        if (IsFullScreen) {
           requestWindowFeature(Window.FEATURE_NO_TITLE);
           getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        }

        this.CheckLogin();
     }

    // Check login function
    // Your menu code

  }

现在你可以在你的 Activity 中扩展它

public class MainScreen extends BaseActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    this.setContentView(R.layout.mainscreen);

   }

}