【Android笔记】选项菜单

摘要: 选项菜单OptionMenu

使用选项菜单OptionMenu

1.创建选项菜单

重写onCreateOptionsMenu()：

2.设置菜单项

通过xml设置：Menunflater.inflate();

代码动态设置：menu.add();

3.设置菜单项监听

重写onOptionsItemSelected();

实例一：通过xml设置菜单

1.在资源目录res下创建menu资源文件夹

2.在menu文件夹下创建menu.xml文件

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

<item
android:id="@+id/action_item1"
android:orderInCategory="100"
android:showAsAction="never"
android:title="菜单一"/>

<item
android:id="@+id/action_item2"
android:orderInCategory="101"
android:showAsAction="never"
android:title="菜单二"/>

<item
android:id="@+id/action_item3"
android:orderInCategory="102"
android:showAsAction="never"
android:title="菜单三"/>

</menu>

3.重写onCreateOptionsMenu()与onOptionsItemSelected()方法

package com.example.demo15;

import android.content.Intent;
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 {

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

/**
* 添加菜单
* @param menu
* @return
*/
@Override
public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.menu, menu);

return true;
}

/**
* 菜单事件监听
* @param item
* @return
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.action_item1:
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
item.setIntent(intent);
break;
case R.id.action_item2:
Toast.makeText(MainActivity.this, "菜单二", Toast.LENGTH_SHORT).show();
break;
case R.id.action_item3:
Toast.makeText(MainActivity.this, "菜单三", Toast.LENGTH_SHORT).show();
break;
}
return super.onOptionsItemSelected(item);
}
}

效果：

实例二：动态设置

package com.example.demo15;

import android.content.Intent;
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 {

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

/**
* 添加菜单
* @param menu
* @return
*/
@Override
public boolean onCreateOptionsMenu(Menu menu) {

//getMenuInflater().inflate(R.menu.menu, menu);

menu.add(1, 100, 1, "菜单一");
menu.add(1, 101, 1, "菜单二");
menu.add(1, 102, 1, "菜单三");
MenuItem menu1 = menu.add(1, 103, 1, "菜单四");
menu1.setTitle("新菜单");

return true;
}

/**
* 菜单事件监听
* @param item
* @return
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case 100:
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
item.setIntent(intent);
break;
case 101:
Toast.makeText(MainActivity.this, "菜单二", Toast.LENGTH_SHORT).show();
break;
case 102:
Toast.makeText(MainActivity.this, "菜单三", Toast.LENGTH_SHORT).show();
break;
case 103:
Toast.makeText(MainActivity.this, "菜单四", Toast.LENGTH_SHORT).show();
break;
}
return super.onOptionsItemSelected(item);
}
}

效果：