【Android】菜单功能的实现：上下文action mode

根据google的API，主要是这么两步：

1.实现ActionMode.CallBack接口

private ActionMode.Callback actionCallback = new ActionMode.Callback() {@Overridepublic boolean onPrepareActionMode(ActionMode mode, Menu menu) {// TODO Auto-generated method stubreturn false;}@Overridepublic void onDestroyActionMode(ActionMode mode) {// TODO Auto-generated method stubactionMode = null;}// 表示要加载菜单，从xml中加载@Overridepublic boolean onCreateActionMode(ActionMode mode, Menu menu) {// TODO Auto-generated method stubMenuInflater inflater = getMenuInflater();inflater.inflate(R.menu.main, menu);return true;}@Overridepublic boolean onActionItemClicked(ActionMode mode, MenuItem item) {// TODO Auto-generated method stubswitch (item.getItemId()) {case R.id.edit:edit();break;case R.id.share:Toast.makeText(MainActivity.this, "Share", Toast.LENGTH_SHORT).show();break;case R.id.delete:Toast.makeText(MainActivity.this, "Delete", Toast.LENGTH_SHORT).show();break;default:break;}return false;}public void edit(){Toast.makeText(MainActivity.this, "edit", Toast.LENGTH_SHORT).show();}};

2.调用startActionMode方法：

button.setOnLongClickListener(new View.OnLongClickListener() {@Overridepublic boolean onLongClick(View v) {// TODO Auto-generated method stubif (actionMode!= null){return false;}actionMode = startActionMode(actionCallback);v.setSelected(true);return true;}});

这时在应用中长按按钮，便弹出菜单。

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