设置所有活动的工具栏 [英] Set toolbar for all Activities

问题描述

在我的应用中，我想为除mainActivity之外的所有活动创建一个唯一的工具栏. 我已经为设置标题和徽标编写了此代码，但是在工具栏中，我也记录了用户名. 因此，我在仪表板活动中编写了以下代码:

In my app I would like to make a unique toolbar for all activities except for mainActivity. I have written this code for set Title and logo, but in toolbar I also have username logged. So I have written in my dashboard activity this code:

Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
    setSupportActionBar(myToolbar);
    getSupportActionBar().setDisplayShowTitleEnabled(false);
    assert myToolbar != null;
    myToolbar.setLogo(R.mipmap.logo_big);

TextView usernameField = (TextView) findViewById(R.id.username);
    try {
        usernameField.setText(User.getInstance().getUsername());
    } catch (JSONException e) {
        e.printStackTrace();
    }

我做了一个可以包含在所有xml文件中的布局. 但是，如何在所有活动中重用此代码而不进行复制和粘贴?

And I made a layout that can be included in all xml files. But How can I reuse this code in all my activities without copy and paste?

单身做错了吗?或实用程序类?

Is it wrong to make a singleton? or a utility class?

谢谢

推荐答案

您可以创建一个基本活动，该活动运行通用代码并使所有其他活动都继承自该通用代码:

You could create a base activity that runs the common code and have all other activities inherit from it:

// the base class
public abstract class BaseActivity extends AppCompatActivity
{
    protected final void onCreate(Bundle savedInstanceState, int layoutId)
    {
        super.onCreate(savedInstanceState);
        setContentView(layoutId);

        Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
        setSupportActionBar(myToolbar);
        getSupportActionBar().setDisplayShowTitleEnabled(false);
        assert myToolbar != null;
        myToolbar.setLogo(R.mipmap.logo_big);

        TextView usernameField = (TextView) findViewById(R.id.username);
        try {
            usernameField.setText(User.getInstance().getUsername());
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

// inheriting activity
public class SomeActivity extends BaseActivity
{
    protected final void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState, R.layout.some_layout);
    }
}

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