Android网络编程之——Android下菜单系统模块的实现(Android客户端+服务器端Servlet+Mysql）

Dear 丶 2022-08-14 03:45 23阅读 0赞

我们向上一个系统中增加一些功能，在成功登陆后，跳转到一个主操作界面，此界面为所有功能的入口，用一个GridView来实现

GridView的经典实现方法流程：布局文件中声明GridView ---> 编写一个ImageAdapter继承BaseAdapter并主要复写getView()方法 ---> 给GridView添加此adapter

布局文件很简单：

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![复制代码][copycode.gif]

![复制代码][copycode.gif]

主Activity同样很简单，放在com.moka.activities中：

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![复制代码][copycode.gif]

public class MainMenuActivity extends Activity {
        
        private GridView gridView = null;
        
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main_menu);
            
            gridView = (GridView) findViewById(R.id.gridView);
            gridView.setAdapter(new ImageAdapter(this));
        }
        
    }

![复制代码][copycode.gif]

ImageAdapter的编写稍微复杂，因为在这里我们把所用监听事件均放在这里处理，在这里我们先添加的是点菜功能，所以姑且把别的监听事件做简单处理

它放在com.moka.provider中：

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public class ImageAdapter extends BaseAdapter {
        
        private Context context = null;
        
        // 所需的图片资源
        private Integer[] functionImgs = { R.drawable.diancai, R.drawable.bingtai, R.drawable.zhuantai,
                R.drawable.chatai, R.drawable.gengxin, R.drawable.shezhi,
                R.drawable.zhuxiao, R.drawable.jietai };
        
        public ImageAdapter(Context context) {
            this.context = context;
        }
        
        @Override
        public int getCount() {
            return functionImgs.length;
        }
    
        @Override
        public Object getItem(int position) {
            return null;
        }
    
        @Override
        public long getItemId(int position) {
            return position;
        }
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // 准备向GridView中填充的ImageView图片与其一些参数
            ImageView imageView = null;
            if (convertView == null) {
                imageView = new ImageView(context);
                imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setPadding(8, 8, 8, 8);
            } else {
                imageView = (ImageView) convertView;
            }
            // 设置图片源
            imageView.setImageResource(this.functionImgs[position]);
            
            // 设置监听事件
            switch (position) {
            case 0:
                imageView.setOnClickListener(new OrderListener());
                break;
            case 1:
                imageView.setOnClickListener(new UnionTableListener());
                break;
            case 2:
                imageView.setOnClickListener(new ChangeTableListener());
                break;
            case 3:
                imageView.setOnClickListener(new CheckTableListener());
                break;
            case 4:
                imageView.setOnClickListener(new UpdateListener());
                break;
            case 5:
                imageView.setOnClickListener(new SetupListener());
                break;
            case 6:
                imageView.setOnClickListener(new ExitListener());
                break;
            case 7:
                imageView.setOnClickListener(new PayListener());
                break;
            }
            
            return imageView;
        }
        
        private class OrderListener implements OnClickListener {
    
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(context, OrderActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(intent);
            }
            
        }
        private class UnionTableListener implements OnClickListener {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "并台！", Toast.LENGTH_SHORT).show();
            }
            
        }
        private class ChangeTableListener implements OnClickListener {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "转台！", Toast.LENGTH_SHORT).show();
            }
            
        }
        private class CheckTableListener implements OnClickListener {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "查台！", Toast.LENGTH_SHORT).show();
            }
            
        }
        private class UpdateListener implements OnClickListener {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "更新！", Toast.LENGTH_SHORT).show();
            }
            
        }
        private class SetupListener implements OnClickListener {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "设置！", Toast.LENGTH_SHORT).show();
            }
            
        }
        private class ExitListener implements OnClickListener {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "注销！", Toast.LENGTH_SHORT).show();
            }
            
        }
        private class PayListener implements OnClickListener {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "结台！", Toast.LENGTH_SHORT).show();
            }
            
        }
    
    }

![复制代码][copycode.gif]

关于点菜的OrderActivity及其服务器端有一定的难度，我们稍后再讨论，先看一下主操作界面效果：

![14181459-a8b00ef45eae4d5fa342045cc901734e.jpg][]

[ExpandedBlockStart.gif]: /images/20220810/04a40ae23102433fa8f2edec1bb1093d.png
[copycode.gif]: /images/20220810/5617111e14ec4daa8e26171db2f20b81.png
[14181459-a8b00ef45eae4d5fa342045cc901734e.jpg]: /images/20220810/cca59f7717b24635b7ed92e6f4605436.png