上下文菜单与上下文操作模式

android 菜单分类：
菜单被分为如下三种，选项菜单（OptionsMenu）、上下文菜单（ContextMenu）和子菜单（SubMenu）
honeycomb 之前版本设备上主要使用 浮动 上下文菜单 ，之后的使用上下文操作栏模式（action mode） 来进行操作

类似：

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".MainActivity">
    <item
        android:id="@+id/action_settings"
        android:icon="@android:drawable/ic_delete"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="@string/app_name" />
    <item
        android:id="@+id/action_settings1"
        android:icon="@android:drawable/ic_menu_add"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="@string/app_name" />
    <item
        android:id="@+id/action_settings2"
        android:icon="@android:drawable/ic_btn_speak_now"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="@string/say" />
</menu>

MainActivity 代码片段


package com.wc.contextmenu;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.ActionMode;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class MainActivity extends FragmentActivity {

    private ActionMode actionMode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//        CrimeListFragment crimeListFragment = new CrimeListFragment();
//        this.getSupportFragmentManager().beginTransaction().replace(R.id.fragment, crimeListFragment).commit();
        Button button = (Button) findViewById(R.id.button);
        button.setOnLongClickListener(new View.OnLongClickListener() {
            // Called when the user long-clicks on someView
            public boolean onLongClick(View view) {
//                if (actionMode != null) {
//                    return false;
//                }
                // Start the CAB using the ActionMode.Callback defined above
                actionMode = MainActivity.this.startActionMode(mCallback);
                view.setSelected(true);
                return true;
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch (id) {
            case R.id.action_settings:


                break;

            default:
                return super.onOptionsItemSelected(item);
        }
        return super.onOptionsItemSelected(item);

    }

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

    private ActionMode.Callback mCallback = new ActionMode.Callback() {

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            return false;
        }

        @Override
        public void onDestroyActionMode(ActionMode mode) {
            // TODO Auto-generated method stub
        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            MenuInflater inflater = mode.getMenuInflater();
            inflater.inflate(R.menu.menu_main, menu);
            return true;
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            boolean ret = false;
            if (item.getItemId() == R.id.action_settings) {
                mode.finish();
                ret = true;
            }
            return ret;
        }
    };

}

1.创建 2.option Context 区别

option context 通过手机自带的meum 进行调用触发，而 ContextMeum 通过 指定的方式进行触发

在这里进行创建
  @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
    }

监听点击事件

   @Override
    public boolean onContextItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch (id) {
            case R.id.action_settings: //获取点击的位置。得到对象
                AdapterView.AdapterContextMenuInfo adapterContextMenuInfo =         (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
                int position = adapterContextMenuInfo.position;
                ArrayAdapter arrayAdapter = (ArrayAdapter) getListAdapter();
                String showParamter = (String) arrayAdapter.getItem(position);
                list1.remove(showParamter);
                ((ArrayAdapter) getListAdapter()).notifyDataSetChanged();
                break;
            case R.id.action_settings1:
                Toast.makeText(getActivity(), "click 上下文菜单 --在这里可以进行删除操作", 400).show();
                break;
            default:
                return super.onOptionsItemSelected(item);
        }
        return super.onContextItemSelected(item);
    }

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