添加菜单-白红宇

添加菜单

阅读量：6611 次

发布时间：2019-06-24

本文共 3569 字，大约阅读时间需要 11 分钟。

1.线性布局添加按钮

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注意：

1.android:orientation="vertical" 在线性布局里必须添加

2.添加程序运行java代码

package com.example.administrator.android;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.ContextMenu;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;import android.view.SubMenu;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    Button bt_1;    Button bt_2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        bt_1 = (Button)findViewById(R.id.bt_1);        bt_2 = (Button)findViewById(R.id.bt_2);        //给组件添加上下文菜单        bt_2.setOnCreateContextMenuListener(this);//        //添加长按监听器//        bt_2.setOnLongClickListener(new View.OnLongClickListener() {//            @Override//            public boolean onLongClick(View v) {//                Toast.makeText(MainActivity.this, "按钮被长按", Toast.LENGTH_SHORT).show();//                return true;//后面不再处理//            }//        });        //点击        bt_1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Toast.makeText(MainActivity.this, "按钮被点击", Toast.LENGTH_SHORT).show();            }        });        //长按        bt_1.setOnLongClickListener(new View.OnLongClickListener() {            @Override            public boolean onLongClick(View v) {                Toast.makeText(MainActivity.this, "按钮被长按", Toast.LENGTH_SHORT).show();                //事件是否已经被消费                return true;            }        });    }    //重写创建上下文菜单的方法    @Override    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {        super.onCreateContextMenu(menu, v, menuInfo);        //代码模式（java）        menu.add(1, 0, 1, "字体大小");        menu.add(1,1,2,"背景颜色");        //添加子菜单        SubMenu sm = menu.addSubMenu(1, 2, 3, "子菜单");        sm.add(2,21,0,"子菜单1");        sm.add(2,22,1,"子菜单2");        //加载文件        MenuInflater m = getMenuInflater();        m.inflate(R.menu.test3_menu,menu);    }    @Override    public boolean onContextItemSelected(MenuItem item) {        Toast.makeText(MainActivity.this, "上下文菜单的标题:"+item.getTitle(), Toast.LENGTH_SHORT).show();        return super.onContextItemSelected(item);    }    //给activity 添加选项菜单    //重写    @Override    public boolean onCreateOptionsMenu(Menu menu) {//        //添加菜单//        menu.add(1,1,0,"添加");//        menu.add(1,2,2,"修改");//        menu.add(1,3,1,"删除");        //加载菜单文件方式        //1-获得菜单加载器        MenuInflater m = getMenuInflater();        //2-加载菜单文件 1)菜单文件 2）当前菜单        m.inflate(R.menu.test3_menu,menu);        return super.onCreateOptionsMenu(menu);    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        Toast.makeText(MainActivity.this, "菜单项的id="+item.getItemId()                +"菜单项的Title"+item.getTitle(), Toast.LENGTH_SHORT).show();        if (item.getItemId()==R.id.me_1)        {            Toast.makeText(MainActivity.this, "删除被执行", Toast.LENGTH_SHORT).show();        }        else if (item.getItemId()==R.id.me_2)        {            Toast.makeText(MainActivity.this, "修改被执行", Toast.LENGTH_SHORT).show();        }        return super.onOptionsItemSelected(item);    }}

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3。添加目录代码程序