今天班级同学聚餐，真的是喝的有点多，本来计划今天要完成这篇博客。有点喝多了，写的不好请见谅。想仔细了解的话，看官网说的，是中文的。
/guide/topics/ui/menus.html
选项菜单
> 只要重写onCreateOptionsMenu()方法即可
MainActivity.java代码如下：
import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {//四个参数的含义。1，group的id,2,item的id,3,是否排序，4，将要显示的内容menu.add(0,1,0,"菜单一");menu.add(0,2,0,"菜单二");menu.add(0,3,0,"菜单三");menu.add(0,4,0,"菜单四");return true;}}
运行效果
接下来为菜单添加点击事件,需要重写onOptionsItemSelected（）方法。
MainActivity.java代码如下：
import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.Toast;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {//四个参数的含义。1，group的id,2,item的id,3,是否排序，4，将要显示的内容menu.add(0,1,0,"菜单一");menu.add(0,2,0,"菜单二");menu.add(0,3,0,"菜单三");menu.add(0,4,0,"菜单四");return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()){case 1:Toast.makeText(MainActivity.this,"菜单一",Toast.LENGTH_SHORT).show();break;case 2:Toast.makeText(MainActivity.this,"菜单二",Toast.LENGTH_SHORT).show();break;case 3:Toast.makeText(MainActivity.this,"菜单三",Toast.LENGTH_SHORT).show();break;case 4:Toast.makeText(MainActivity.this,"菜单四",Toast.LENGTH_SHORT).show();break;}return true;}}
运行效果
子菜单
只要在onCreateOptionsMenu（）方法中添加
SubMenu sub=menu.addSubMenu(“子菜单”);
sub.add(0,5,0,”子菜单一”);
sub.add(0,6,0,”子菜单二”);
sub.add(0,7,0,”子菜单三”);
然后再为子菜单添加点击事件。
MainActivity.java全部代码如下
import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.SubMenu;import android.widget.Toast;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {//四个参数的含义。1，group的id,2,item的id,3,是否排序，4，将要显示的内容menu.add(0,1,0,"菜单一");menu.add(0,2,0,"菜单二");menu.add(0,3,0,"菜单三");menu.add(0,4,0,"菜单四");SubMenu sub=menu.addSubMenu("子菜单");sub.add(0,5,0,"子菜单一");sub.add(0,6,0,"子菜单二");sub.add(0,7,0,"子菜单三");return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()){case 1:Toast.makeText(MainActivity.this,"菜单一",Toast.LENGTH_SHORT).show();break;case 2:Toast.makeText(MainActivity.this,"菜单二",Toast.LENGTH_SHORT).show();break;case 3:Toast.makeText(MainActivity.this,"菜单三",Toast.LENGTH_SHORT).show();break;case 4:Toast.makeText(MainActivity.this,"菜单四",Toast.LENGTH_SHORT).show();break;case 5:Toast.makeText(MainActivity.this,"子菜单一",Toast.LENGTH_SHORT).show();break;case 6:Toast.makeText(MainActivity.this,"子菜单二",Toast.LENGTH_SHORT).show();break;case 7:Toast.makeText(MainActivity.this,"子菜单三",Toast.LENGTH_SHORT).show();break;}return true;}}
上下文菜单
只要重写这个方法onCreateContextMenu（）如果在为它添加点击事件，就需要再重写onContextItemSelected（）方法
MainActivity.java代码如下：
import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.ContextMenu;import android.view.Menu;import android.view.MenuItem;import android.view.SubMenu;import android.view.View;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends AppCompatActivity {private TextView mTv;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mTv = (TextView) findViewById(R.id.tv);registerForContextMenu(mTv);//为mTv注册事件}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {//四个参数的含义。1，group的id,2,item的id,3,是否排序，4，将要显示的内容menu.add(0, 1, 0, "菜单一");menu.add(0, 2, 0, "菜单二");menu.add(0, 3, 0, "菜单三");menu.add(0, 4, 0, "菜单四");SubMenu sub = menu.addSubMenu("子菜单");sub.add(0, 5, 0, "子菜单一");sub.add(0, 6, 0, "子菜单二");sub.add(0, 7, 0, "子菜单三");return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()) {case 1:Toast.makeText(MainActivity.this, "菜单一", Toast.LENGTH_SHORT).show();break;case 2:Toast.makeText(MainActivity.this, "菜单二", Toast.LENGTH_SHORT).show();break;case 3:Toast.makeText(MainActivity.this, "菜单三", Toast.LENGTH_SHORT).show();break;case 4:Toast.makeText(MainActivity.this, "菜单四", Toast.LENGTH_SHORT).show();break;case 5:Toast.makeText(MainActivity.this, "子菜单一", Toast.LENGTH_SHORT).show();break;case 6:Toast.makeText(MainActivity.this, "子菜单二", Toast.LENGTH_SHORT).show();break;case 7:Toast.makeText(MainActivity.this, "子菜单三", Toast.LENGTH_SHORT).show();break;}return true;}@Overridepublic void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {if (v == mTv) {menu.add(0, 1, 0, "上下文菜单一");menu.add(0, 2, 0, "上下文菜单二");menu.add(0, 3, 0, "上下文菜单三");}super.onCreateContextMenu(menu, v, menuInfo);}@Overridepublic boolean onContextItemSelected(MenuItem item) {switch (item.getItemId()) {case 1:Toast.makeText(MainActivity.this, "上下文菜单一", Toast.LENGTH_SHORT).show();break;case 2:Toast.makeText(MainActivity.this, "上下文菜单二", Toast.LENGTH_SHORT).show();break;case 3:Toast.makeText(MainActivity.this, "上下文菜单三", Toast.LENGTH_SHORT).show();break;}return true;}}
需要长按Textview才行，运行结果，
选项菜单，子菜单，上下文菜单基本使用方法基本就演示完了。
其实也可以写布局文件，直接加载布局文件也行，下面我们就演示下吧。
menu中菜单代码如下：
<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="/apk/res/android"><group android:id="@+id/group"><item android:id="group_one"android:title="选项菜单一"></item><item android:id="group_two"android:title="选项菜单二"></item><item android:id="group_three"android:title="选项菜单三"></item><item android:id="group_four"android:title="选项菜单四"><menu><itemandroid:id="child_one"android:title="子菜单一"></item><itemandroid:id="child_two"android:title="子菜单二"></item><itemandroid:id="child_three"android:title="子菜单三"></item></menu></item></group></menu>
MainActivity.java代码如下：
import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.ContextMenu;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.SubMenu;import android.view.View;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends AppCompatActivity {private TextView mTv;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mTv = (TextView) findViewById(R.id.tv);registerForContextMenu(mTv);//为mTv注册事件}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {//四个参数的含义。1，group的id,2,item的id,3,是否排序，4，将要显示的内容// menu.add(0, 1, 0, "菜单一");// menu.add(0, 2, 0, "菜单二");// menu.add(0, 3, 0, "菜单三");// menu.add(0, 4, 0, "菜单四");// SubMenu sub = menu.addSubMenu("子菜单");// sub.add(0, 5, 0, "子菜单一");// sub.add(0, 6, 0, "子菜单二");// sub.add(0, 7, 0, "子菜单三");getMenuInflater().inflate(R.menu.item_menu,menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()) {case R.id.group_one:Toast.makeText(MainActivity.this, "菜单一", Toast.LENGTH_SHORT).show();break;case R.id.group_two:Toast.makeText(MainActivity.this, "菜单二", Toast.LENGTH_SHORT).show();break;case R.id.group_three:Toast.makeText(MainActivity.this, "菜单三", Toast.LENGTH_SHORT).show();break;case R.id.group_four:Toast.makeText(MainActivity.this, "菜单四", Toast.LENGTH_SHORT).show();break;case R.id.child_one:Toast.makeText(MainActivity.this, "子菜单一", Toast.LENGTH_SHORT).show();break;case R.id.child_two:Toast.makeText(MainActivity.this, "子菜单二", Toast.LENGTH_SHORT).show();break;case R.id.child_three:Toast.makeText(MainActivity.this, "子菜单三", Toast.LENGTH_SHORT).show();break;}return true;}@Overridepublic void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {if (v == mTv) {menu.add(0, 1, 0, "上下文菜单一");menu.add(0, 2, 0, "上下文菜单二");menu.add(0, 3, 0, "上下文菜单三");}super.onCreateContextMenu(menu, v, menuInfo);}@Overridepublic boolean onContextItemSelected(MenuItem item) {switch (item.getItemId()) {case 1:Toast.makeText(MainActivity.this, "上下文菜单一", Toast.LENGTH_SHORT).show();break;case 2:Toast.makeText(MainActivity.this, "上下文菜单二", Toast.LENGTH_SHORT).show();break;case 3:Toast.makeText(MainActivity.this, "上下文菜单三", Toast.LENGTH_SHORT).show();break;}return true;}}
运行效果还是跟前面的选项菜单一样。只是数据来自menu中
运行结果：
总结
其实这三种菜单不难，只要按照写一遍就会了。
源码下载
/songshuilin/AndroidForBlog/tree/master/androidformenu
如果觉得《android之三大菜单（子菜单 选项菜单 上下文菜单）》对你有帮助，请点赞、收藏，并留下你的观点哦！
