ContextMenu的简单使用

最新推荐文章于 2025-07-05 15:39:45 发布

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本文详细介绍了在Android应用中如何实现上下文菜单功能，包括菜单的注册、创建、显示及处理菜单项点击事件。通过实例代码展示了如何在TextView上绑定上下文菜单，并实现了多个菜单项和子菜单的交互。

public class ContextMenuActivity extends Activity
        implements View.OnClickListener {
    private String TAG = ContextMenuActivity.class.getSimpleName();
    TextView txt;
    ContextMenu menu;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_context_menu);
        txt = (TextView) findViewById(R.id.txt);
        txt.setOnClickListener(this);
        registerForContextMenu(txt);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterForContextMenu(txt);
    }

    @Override
    public void onClick(View v) {

    }

    @Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        int itemId = item.getItemId();
        switch (itemId) {
            case 0:
                Toast.makeText(this, "菜单1", Toast.LENGTH_SHORT).show();
                break;
            case 1:
                Toast.makeText(this, "菜单2", Toast.LENGTH_SHORT).show();
                break;
            case 2:
                Toast.makeText(this, "子菜单", Toast.LENGTH_SHORT).show();
                break;
            case 3:
                Toast.makeText(this, "子菜单项1", Toast.LENGTH_SHORT).show();
                break;
            case 4:
                Toast.makeText(this, "子菜单项2", Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onMenuItemSelected(featureId, item);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);

        menu.setHeaderTitle("上下文菜单");
        menu.setHeaderIcon(R.mipmap.ic_launcher);

        menu.add(0, 0, Menu.NONE, "菜单项1");
        menu.add(2, 1, Menu.NONE, "菜单项2");

        SubMenu sub = menu.addSubMenu(1, 2, Menu.NONE, "子菜单");
        sub.add(1, 3, Menu.NONE, "子菜单项1");
        sub.add(1, 4, Menu.NONE, "子菜单项2");
    }
}