android点击按钮弹出上下文菜单

对于ListView的子项长按弹出上下文菜单是比较常见的操作，流程是先设置长按事件（setOnLongClickListener）返回false 来允许触发创建上下文菜单listener(setOnCreateContextMenuListener)  然后添加菜单项  最后点击菜单时会调用onContextItemSelected

 

而对于Button的话需要主动调用showContextMenu方法来触发创建上下文菜单listener

private Button mBtnShowMenu;



mBtnShowMenu = (Button)findViewById(R.id.btn_showmenu);

// 点击弹出菜单

mBtnShowMenu.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
 mBtnShowMenu.showContextMenu();
}
});

// 创建上下文菜单listener

mBtnShowMenu.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
menu.add(0,1,0,"选项1");

menu.add(0,2,0,"选项2");
}
});

// 选择上下文菜单

@Override
public boolean onContextItemSelected(MenuItem item) {

switch (item.getGroupId()) {

case 0:

{

switch (item.getItemId()) {

case 1:

{

// 点击选项1

}break;

case 2:

{

// 点击选项2

}break;

} // end get item id

} 

default:break;

}

return true;

}