Android d出式菜单 绑定到按钮

概述在按钮上绑定d出菜单就可以实现点击按钮下拉菜单的效果publicclassMainActivityextendsAppCompatActivity{@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.acti

在按钮上绑定d出菜单就可以实现点击按钮下拉菜单的效果

public class MainActivity extends AppCompatActivity {    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        // 为这个按钮绑定d出菜单        final button btn = findVIEwByID(R.ID.btn);        // 长按时显示d出菜单        btn.setonLongClickListener(new VIEw.OnLongClickListener() {            @OverrIDe            public boolean onLongClick(VIEw v) {                // 初始化菜单                PopupMenu popupMenu = new PopupMenu(MainActivity.this, btn);                                // 将菜单视图文件绑定到popupMenu的menu对象上                popupMenu.getMenuInflater().inflate(R.menu.first, popupMenu.getMenu());                                // 注册菜单项监听器                popupMenu.setonMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {                    @OverrIDe                    public boolean onMenuItemClick(MenuItem item) {                        switch (item.getItemID()) {                            case R.ID.login:                                Toast.makeText(MainActivity.this, "你刚刚点了登录", Toast.LENGTH_LONG).show();                                break;                            case R.ID.register:                                Toast.makeText(MainActivity.this, "你刚刚点了注册", Toast.LENGTH_LONG).show();                                break;                        }                        return false;                    }                });                                // 显示菜单                popupMenu.show();                return true;            }        });    }}

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