Android单击显示contextMenu

onCreateContextMenu是view的上下文菜单，这在上一篇中《Android中的2种Menu：OptionsMenu、ContextMenu》已经讲过

一般都是长按跳出onCreateContextMenu，但有时需要单击跳出onCreateContextMenu。比如替换Dialog等

//绑定onCreateContextMenu
btn_one = (Button) findViewById(R.id.btn_one);
btn_one.setOnCreateContextMenuListener(this);
btn_one.setOnClickListener(onclick_one);

//单击显示ContextMenu
private View.OnClickListener onclick_one = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        v.showContextMenu();
    }
};

//创建onCreateContextMenu
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        super.onCreateContextMenu(menu, v, menuInfo);
}

//onCreateContextMenu选项事件
@Override
public boolean onContextItemSelected(MenuItem item) {
    int id = item.getItemId();
    switch (id) {
        case R.id.action_settings:
            break;
        case R.id.action_add:
            break;
    }

    return super.onContextItemSelected(item);
}

menu_main.xml放在res的menu目录下。没有自己新建一个目录

 xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".MainActivity">
    
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:showAsAction="never"
        android:title="@string/action_settings" />
    
        android:id="@+id/action_add"
        android:orderInCategory="100"
        android:showAsAction="never"
        android:title="@string/action_add" />