在实现如上图的ListView时，Activity中之前的源码为：
classList_3 = (ListView) findViewById(R.id.classList_3); final List<Integer> classInfos_3 = new ArrayList<>(); classInfos_3.add(R.string.point_C1); //多线程开发 classInfos_3.add(R.string.point_C2); //多进程开发 classInfos_3.add(R.string.point_C3); ClassListAdpter_Integer classListAdpter_Integer_3 = new ClassListAdpter_Integer(MainActivity.this, classInfos_3); classList_3.setAdapter(classListAdpter_Integer_3); classList_3.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { switch (position) { case 0: startActivity(new Intent(MainActivity.this, Point_B1_Activity.class)); break; case 1: startActivity(new Intent(MainActivity.this, Point_B2_Activity.class)); break; case 2: startActivity(new Intent(MainActivity.this, Point_B3_Activity.class)); break; } } }); 只将相应字符串的ID值传入List，然后在OnItenClickListener中通过swtich(position)来进行点击跳转。可做如下优化：
classList_2 = (ListView) findViewById(R.id.classList_2); final List<ActivityItem> classInfos_2 = new ArrayList<>(); classInfos_2.add(new ActivityItem(R.string.point_B1, Point_B1_Activity.class)); classInfos_2.add(new ActivityItem(R.string.point_B2, Point_B2_Activity.class)); //管理文件 classInfos_2.add(new ActivityItem(R.string.point_B3, Point_B3_Activity.class)); //SQLite classInfos_2.add(new ActivityItem(R.string.point_B4, Point_B4_Activity.class)); //ContentProvider classInfos_2.add(new ActivityItem(R.string.point_B5, Point_B5_Activity.class)); classInfos_2.add(new ActivityItem(R.string.point_B6, Point_B6_Activity.class)); classInfos_2.add(new ActivityItem(R.string.point_B7, Point_B7_Activity.class)); ClassListAdpter_Activity classListAdpter_Activity_2 = new ClassListAdpter_Activity(MainActivity.this, classInfos_2); classList_2.setAdapter(classListAdpter_Activity_2); classList_2.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { startActivity(new Intent(MainActivity.this, classInfos_2.get(position).getItemActivity())); } }); 其中，ActivityItem类如下：
public class ActivityItem { private int mItemName; private Class mItemActivity; public ActivityItem(int itemName, Class itemActivity) { mItemName = itemName; mItemActivity = itemActivity; } public int getItemName() { return mItemName; } public void setItemName(int itemName) { this.mItemName = itemName; } public Class getItemActivity() { return mItemActivity; } public void setItemActivity(Class itemActivity) { this.mItemActivity = itemActivity; } }
简单的优化，将要跳转到的Activity作为ActivityItem类的成员之一，OnItenClickListener中的代码大为简化，再无需使用swtich(position)来进行判断。虽然增加了一个类，但项目的代码较为优化，符合相应的设计思想。
