ContextMenu建立及動態(長按btn出現的選單)

ContextMenu建立及動態

ContextMenu建立及動態/ContextMenu

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.robert.sample13.MenuActivity$PlaceholderFragment" >

    <Button

        android:id="@+id/menuButton"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:text="Click and hold on this button"/>

</RelativeLayout>

 ContextMenu建立及動態/動態

import android.app.Activity;

import android.app.Fragment;

import android.os.Bundle;

import android.view.ContextMenu;

import android.view.ContextMenu.ContextMenuInfo;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.Toast;

public class MenuActivity extends Activity {

        @Override

        protected void onCreate(Bundle savedInstanceState) {

                super.onCreate(savedInstanceState);

                setContentView(R.layout.activity_menu);

                if (savedInstanceState == null) {

                        getFragmentManager().beginTransaction()

                                        .add(R.id.container, new PlaceholderFragment()).commit();

                }

        }

        @Override

        public boolean onCreateOptionsMenu(Menu menu) {

                // Inflate the menu; this adds items to the action bar if it is present.

                getMenuInflater().inflate(R.menu.menu, menu);

                return true;

        }

        @Override

        public boolean onOptionsItemSelected(MenuItem item) {

                Toast.makeText(this, item.getTitle(), Toast.LENGTH_SHORT).show();

                String selectedMenu;

                switch(item.getItemId()){

                        case R.id.menu1:

                                selectedMenu="menu1";

                                break;

                        case R.id.menu2:

                                selectedMenu="menu2";

                                break;

                        case R.id.menu3:

                                selectedMenu="menu3";

                                break;

                        case R.id.menu4:

                                selectedMenu="menu4";

                                break;

                        default:

                                selectedMenu="";

                }

               

                Toast.makeText(this, selectedMenu, Toast.LENGTH_SHORT).show();

                return true;

        }

       

       

        @Override

        public void onCreateContextMenu(ContextMenu menu, View v,

                        ContextMenuInfo menuInfo) {

                getMenuInflater().inflate(R.menu.menu, menu);

               

        }

       

       

        @Override

        public boolean onContextItemSelected(MenuItem item) {

                Toast.makeText(this, item.getTitle(), Toast.LENGTH_SHORT).show();

                return true;

        }

        /**

         * A placeholder fragment containing a simple view.

         */

        public static class PlaceholderFragment extends Fragment {

                public PlaceholderFragment() {

                }

                @Override

                public View onCreateView(LayoutInflater inflater, ViewGroup container,

                                Bundle savedInstanceState) {

                        View rootView = inflater.inflate(R.layout.fragment_menu, container,

                                        false);

                        Button btn=(Button)rootView.findViewById(R.id.menuButton);

                        btn.setOnCreateContextMenuListener(PlaceholderFragment.this.getActivity());

                        return rootView;

                }

        }

}