安卓开发Android Studio新版本menu菜单不显示的问题
<p>在新版本的Android Studio 直接配置菜单会显示不出来，新版本新建菜单经节如下：</p><p>activity_main.xml（布局文件）：</p>
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<pre class="brush:csharp;gutter:true;"><?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
android:popupTheme="@style/ThemeOverlay.AppCompat.Light">
</androidx.appcompat.widget.Toolbar>
<TextView
android:id="@+id/textView"
android:layout_below="@+id/toolbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</RelativeLayout>
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<p> 菜单文件，menu 文件配置如下，这一块几乎和低本一致，这块不重要</p>
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<pre class="brush:csharp;gutter:true;"><?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/menu_save"
android:title="Save"
android:icon="@drawable/ic_save" />
<item
android:id="@+id/menu_delete"
android:title="Delete"
android:icon="@drawable/ic_delete" />
</menu>
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<p> 最后就是主文件会多一句引用，MainActivity.java： 文件内容如下</p>
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<pre class="brush:csharp;gutter:true;">import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import androidx.appcompat.widget.Toolbar;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
textView = findViewById(R.id.textView);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.menu_save) {
Toast.makeText(this, "Save clicked", Toast.LENGTH_SHORT).show();
return true;
} else if (id == R.id.menu_delete) {
Toast.makeText(this, "Delete clicked", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
}
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<p> 如此配置以后运行效果如下：</p>
<p><img src="https://img2023.cnblogs.com/blog/1447366/202310/1447366-20231015104049920-462097240.png"></p>
<p> </p><br><br>
来源：https://www.cnblogs.com/fgxwan/p/17765351.html
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