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）

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：

<LinearLayout 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" >        <GridView         android:id="@+id/gridView"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:columnWidth="90dp"        android:numColumns="auto_fit"        android:verticalSpacing="10dp"        android:horizontalSpacing="10dp"        android:stretchMode="columnWidth"        android:gravity="center"        />        </LinearLayout>

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

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));    }    }

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：

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();        }            }}

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：

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