Android界面编程之Menu（菜单）

显示菜单的方法：在MainActivity种定义如下方法：

public boolean onCreateOptionsMenu(Menu menu){
        getMenuInflater().inflate(R.menu.mymenu,menu);
        return super.onCreateOptionsMenu(menu);
    }

创建Menu文件：

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

    <item
        android:id="@+id/menu_seeting"
        android:orderInCategory="100"
        app:showAsAction="never"
        android:title="Settings" />
    <item android:id="@+id/menu_color"
        android:title="设置背景颜色">
        <menu>
            <group>
                <item android:id="@+id/Accent"
                    android:title="Accent"/>
                <item android:id="@+id/Primary"
                    android:title="Primary"/>
                <item android:id="@+id/PrimaryDark"
                    android:title="PrimaryDark"/>
            </group>
        </menu>
    </item>
    <item android:id="@+id/menu_turn"
        android:title="openDialog"/>
</menu>

MainActivity:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public boolean onCreateOptionsMenu(Menu menu){
        getMenuInflater().inflate(R.menu.mymenu,menu);
        return super.onCreateOptionsMenu(menu);
    }
    public boolean onOptionsItemSelected(MenuItem item){
        TextView textView =(TextView)findViewById(R.id.info);
        switch (item.getItemId()){
            case R.id.Accent:
                textView.setBackgroundResource(R.color.colorAccent);
                break;
            case R.id.Primary:
                textView.setBackgroundResource(R.color.colorPrimary);
                break;
            case R.id.PrimaryDark:
                textView.setBackgroundResource(R.color.colorPrimaryDark);
                break;
            case R.id.menu_turn:
                openDialog(null);
                break;
            case R.id.menu_seeting:
                Toast.makeText(this,"你单击了设置菜单",Toast.LENGTH_LONG).show();
                break;
        }

        return true;
    }


    public void openDialog(View view) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("加薪消息");
        builder.setMessage("听说要涨工资了，不知道是真的还是假的");
        builder.setNegativeButton("真的", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(getApplication(), "你是天使，会说准的",
                        Toast.LENGTH_SHORT).show();
            }
        });
        builder.setPositiveButton("假的", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(getApplication(), "闭嘴，知道乌鸦是怎么死的码？",
                        Toast.LENGTH_SHORT).show();
            }
        });
        builder.create();
        builder.show();
    }
}

示例：