显示和隐藏ActionBar

手动显示隐藏

package com.example.practice3;

import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button button_h;
    Button button_s;
    ActionBar actionBar;

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

        button_h = findViewById(R.id.b_hide);
        button_s = findViewById(R.id.b_show);
        actionBar = getSupportActionBar();

        button_h.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                actionBar.hide();
            }
        });

        button_s.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                actionBar.show();
            }
        });
    }
}

添加Action Item

实例：添加ActionItem

package com.example.practice3;

import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //解析菜单资源文件
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.menu,menu);
        return super.onCreateOptionsMenu(menu);
    }
}

添加ActionView

在ActionBar上添加ActionView有两种方式

代码和解析如下：

ActionBar与Tab…

实现层级式导航