Android-使用PopupMenu创建弹出式菜单

public class MainActivity extends Activity {
    PopupMenu popupMenu = null ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void onPopupButtonClick(View button){
        //创建PopupMenu对象
        popupMenu = new PopupMenu(this, button);
        //将 R.menu.menu_main 菜单资源加载到popup中
        getMenuInflater().inflate(R.menu.menu_main,popupMenu.getMenu());
        //为popupMenu选项添加监听器
        popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                switch (item.getItemId()){
                    case R.id.plain_item:
                        //隐藏对话框
                        popupMenu.dismiss();
                        break;
                    default:
                        Toast.makeText(MainActivity.this,"you clicked->" + item.getTitle(), Toast.LENGTH_SHORT).show();
                }
                return true;
            }
        });
        popupMenu.show();
    }

}