ContextMenu菜单创建 上下文菜单的基本认识q

 

 

 

 

MainActivity.class

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public class MainActivity extends AppCompatActivity {       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         showlistView();       }       private void showlistView() {         ListView listView = (ListView) findViewById(R.id.listview);         ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,getData());         listView.setAdapter(adapter);         this.registerForContextMenu(listView);//view注册到上下文菜单       }       private ArrayList<String> getData(){         ArrayList<String> list = new ArrayList<String>();         for(int i = 0; i < 5 ;i++){             list.add("ITEM" + i);         }         return list;     }       @Override     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {         super.onCreateContextMenu(menu, v, menuInfo);         //设置上下文菜单显示的内容         menu.setHeaderTitle("文件的操作");         menu.setHeaderIcon(R.mipmap.ic_launcher);         //方法一、动态代码加载项目 //        menu.add(1, 1, 1, "复制"); //        menu.add(1,2,1,"粘贴"); //        menu.add(1,3,1,"剪切"); //        menu.add(1,4,1,"重命名");         //方法二、静态加载项目         MenuInflater inflater = getMenuInflater();         inflater.inflate(R.menu.menu_main,menu);       }       //点击事件     @Override     public boolean onContextItemSelected(MenuItem item) {         switch (item.getItemId()){             case 1:{                 Toast.makeText(this,"点击了复制",Toast.LENGTH_SHORT).show();                 break;             }             case 2:{                 Toast.makeText(this,"点击了粘贴",Toast.LENGTH_SHORT).show();                 break;             }             case 3:{                 Toast.makeText(this,"点击了剪切",Toast.LENGTH_SHORT).show();                 break;             }             case 4:{                 Toast.makeText(this,"点击了重命名",Toast.LENGTH_SHORT).show();                 break;             }         }         return super.onContextItemSelected(item);     } }