Android ContextMenu的使用

枕上诗书闲处好，门前风景雨来佳。这篇文章主要讲述Android ContextMenu的使用相关的知识，希望能为你提供帮助。
ContextMenu介绍：
假设一个View注冊了上下文菜单。那么当长按该View时便会弹出一个浮动菜单，来供选择下一步操作。

文章图片

实现这个功能须要调用setOnCreateContextMenuListener来注冊一个监听器。那么它和注冊长按监听器setOnLongClickListener有什么差别呢？以下会在代码中加以測试，通过加入打印发现，用户对某个View长按之后。首先触发的是onLongClick函数，运行onLongClick操作，然后依据onLongClick的返回值推断是不是运行OnCreateContextMenuListener函数。假设onLongClick返回false。则会继续运行OnCreateContextMenuListener函数，假设返回true。忽略OnCreateContextMenuListener函数。

代码例如以下：

public class MainActivity extends ActionBarActivity { ImageView mImageView ; MyContextMenuClickListener mContextListener; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_main); mImageView = (ImageView) findViewById(R.id.image); mContextListener = new MyContextMenuClickListener(); mImageView.setOnCreateContextMenuListener(mContextListener); //test mImageView.setOnLongClickListener(new OnLongClickListener() {@Override public boolean onLongClick(View arg0) { // TODO Auto-generated method stub Log.d(" Test" , " onLongClick" ); return false; } }); } private class MyContextMenuClickListener implements OnCreateContextMenuListener , OnMenuItemClickListener{@Override public boolean onMenuItemClick(MenuItem item) { // TODO Auto-generated method stub switch(item.getItemId()){ case R.id.open: Log.d(" Test" , " click open" ); break; case R.id.delete: Log.d(" Test" , " click delete" ); break; case R.id.remove: Log.d(" Test" , " click remove" ); break; default: break; } return true; }@Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { // TODO Auto-generated method stub Log.d(" Test" , " onCreateContextMenu" ); MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.context_menu, menu); LayoutInflater layoutInflater = getLayoutInflater(); View view = (View) layoutInflater.inflate( R.layout.menu_header, null); menu.setHeaderView(view); MenuItem open = menu.findItem(R.id.open); open.setOnMenuItemClickListener(mContextListener); MenuItem delete = menu.findItem(R.id.delete); delete.setOnMenuItemClickListener(mContextListener); MenuItem remove = menu.findItem(R.id.remove); remove.setOnMenuItemClickListener(mContextListener); } }}

context_menu.xml

< ?xml version=" 1.0" encoding=" UTF-8" ?
> < menu xmlns:android=" http://schemas.android.com/apk/res/android" > < group android:id=" @+id/CONTEXT_MENU" > < item android:id=" @+id/delete" android:title=" delete" /> < item android:id=" @+id/open" android:title=" open" /> < item android:id=" @+id/remove" android:title=" remove" /> < /group> < /menu>

menu_header.xml

< ?
xml version=" 1.0" encoding=" UTF-8" ?
> < LinearLayout xmlns:android=" http://schemas.android.com/apk/res/android" android:layout_height=" wrap_content" android:layout_width=" wrap_content" > < TextView android:layout_width=" wrap_content" android:layout_height=" wrap_content" android:text=" This is a Test" /> < /LinearLayout>

假设须要自己关闭ContextMenu弹框。能够调用：