向多个活动添加相同的上下文菜单

Question

我试图弄清楚如何在多个活动中包含常见的代码。

更具体地说，我有一个上下文菜单，我想将它包含在几个活动中。 我看到了这一点，但只是不明白如何扩展到多个活动。 http://developer.android.com/guide/topics/ui/menus.html

我已将此设置为 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 个活动中添加相同的功能而不是创建 1 个通用活动 像 BaseActivity 并扩展该活动将在您继承的所有活动中包含该常用功能

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

  }

现在你可以在你的活动中扩展它

public class MainScreen extends BaseActivity {

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

    this.setContentView(R.layout.mainscreen);

   }

}

Answer 2

您可以在 xml 文件中定义一个菜单，然后在 onCreateOptionsMenu 中加载该菜单。您仍然需要处理每个活动中的每个菜单项。您还可以创建一个 BaseActivity 类来处理每个 Activity 可以扩展的菜单内容。

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/about" android:title="About"
        android:icon="@drawable/ic_menu_about"/>
    <item android:id="@+id/search"
          android:icon="@drawable/ic_menu_search" android:title="Search"></item>
    <item android:id="@+id/my_location"
          android:title="My Location"
          android:icon="@drawable/ic_menu_mylocation">
    </item>
</menu>


public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.options_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }

Answer 3

尝试使用abstract 类

  abstract class BaseMenu extends Activity
  {
         //Initialize your menus

         // 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;
}}

现在扩展类 BaseMenu 而不是 Activity

我认为这可以帮助你。