android 实现上下文菜单实例_android实现菜单并响应实例-优快云博客

本文链接：https://blog.youkuaiyun.com/hzh_csdn/article/details/52244574

本文介绍了如何在Android应用中实现上下文菜单。通过长按消息，可以展示一系列针对该消息的操作选项，模拟类似QQ消息列表的功能。文章从布局文件`activity_main.xml`的设置开始讲解。

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前言

在QQ的消息列表中，我们长按某条消息，则可出现对该消息进行处理的菜单，我们简单模拟一下。

1.布局文件

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="cn.sehzh.contextmenutester.MainActivity" >

    <item
        android:id="@+id/addItem"
        android:title="增加">
    </item>
    <item
        android:id="@+id/editItem"
        android:title="修改">
    </item>
    <item
        android:id="@+id/deleteItem"
        android:title="删除">
    </item>

</menu>

2 MainActivity

package cn.sehzh.contextmenutester;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {
	private static final String TAG = "MYTAG";
	private ListView mListView;
	private List<String> mList = new ArrayList<>();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		mList.add("hzh");
		mList.add("qwe");
		mList.add("asd");

		mListView = (ListView) findViewById(R.id.listView);
		ArrayAdapter<String> adapter;
		adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, mList);
		mListView.setAdapter(adapter);
		
		registerForContextMenu(mListView);
	}

	@Override
	public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
		super.onCreateContextMenu(menu, v, menuInfo);

		MenuInflater inflater;
		inflater = getMenuInflater();
		inflater.inflate(R.menu.main, menu);
	}

	@Override
	public boolean onContextItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.addItem:
			Log.i(TAG, "add...");
			break;
		case R.id.editItem:
			Log.i(TAG, "edit...");
			break;
		case R.id.deleteItem:
			Log.i(TAG, "delete...");
			break;
		default:
			break;
		}

		return super.onContextItemSelected(item);
	}

}

3.实现效果