Question

我的Android代码有问题。我想在android工具栏上创建按钮图标。并且图标在预览时显示。见下图 menu.xml

但是当我运行这个项目时，按钮图标没有显示出来。 run project

这是我的活动代码

public class Main2Activity extends AppCompatActivity {

private NavigationView navigationView;
private DrawerLayout dr;
private Toolbar toolbar;

private View navHeader;

private ActionBarDrawerToggle actionBarDrawerToggle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    navigationView = (NavigationView) findViewById(R.id.navigation_view);
    dr = (DrawerLayout) findViewById(R.id.drawer);
    toolbar = (Toolbar) findViewById(R.id.toolbar);

    setSupportActionBar(toolbar);

    setupDrawerContent(navigationView);

    actionBarDrawerToggle = setupDrawerToggle();
    dr.setDrawerListener(actionBarDrawerToggle);

    selectDrawerItem(navigationView.getMenu().getItem(0));
}

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

问题是什么？任何建议将不胜感激。谢谢

Answer 1

在名为main_menu_tool.xml＆amp;的菜单中创建一个资源文件。粘贴波纹管代码

  <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:balloonberry="http://schemas.android.com/apk/res-auto">

 <item
   android:id="@+id/miCompose"
   balloonberry:showAsAction="always"
   android:icon="@drawable/menu"/>
   <item
    android:id="@+id/miProfile"
   balloonberry:showAsAction="always"
   android:icon="@drawable/week_view"/>

</menu>

在Main2Activity中，只需写一下......

    @Override
   public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.main_menu_tool, menu);
      return true;
   }

Answer 2

这是我为位置图标编写的Menu.XML的代码。 Image

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
    android:id="@+id/Location1"
    app:showAsAction="always"
    android:icon="@drawable/location"
    android:title="@string/location"

    />
</menu>

MainActivity.java的一部分代表图标

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.Location1) {
            Intent intent = new Intent(MainActivity.this,Location.class);
            startActivity(intent);


        }

        return super.onOptionsItemSelected(item);
    }

希望它有所帮助。

按钮图标没有显示在android工具栏上

2 个答案: