ListView的应用
1.在很多时候是要用到时间轴的,有些处理的时间轴比较复杂,这里就给出一个比较简单的时间轴,其实就是ListView里面的Item的设计。
直接上代码:
ListView,item的xml文件-->time_item.xml
1 <?xml version="1.0" encoding="utf-8"?> 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:background="#ffffff" > 6 7 <View 8 android:id="@+id/top_line" 9 android:layout_width="2dp" 10 android:layout_height="35dp" 11 android:layout_marginLeft="50dp" 12 android:background="@color/gray" /> 13 14 <ImageView 15 android:id="@+id/img_icon" 16 android:layout_width="wrap_content" 17 android:layout_height="wrap_content" 18 android:layout_alignParentLeft="true" 19 android:layout_below="@+id/top_line" 20 android:layout_marginLeft="40dp" 21 android:src="@drawable/timeline_green" /> 22 23 <TextView 24 android:id="@+id/tv_time" 25 android:layout_width="wrap_content" 26 android:layout_height="wrap_content" 27 android:layout_below="@id/top_line" 28 android:layout_marginLeft="10dp" 29 android:text="时间" /> 30 31 <View 32 android:id="@+id/bottom_line" 33 android:layout_width="2dp" 34 android:layout_height="50dp" 35 android:layout_below="@id/img_icon" 36 android:layout_marginLeft="50dp" 37 android:background="@color/gray" /> 38 39 <LinearLayout 40 android:layout_width="match_parent" 41 android:layout_height="match_parent" 42 android:layout_below="@id/top_line" 43 android:layout_marginLeft="65dp" 44 android:background="@drawable/timeline_content" 45 android:orientation="horizontal" > 46 47 <ImageView 48 android:layout_width="wrap_content" 49 android:layout_height="wrap_content" 50 android:src="@drawable/ic_launcher" /> 51 52 <TextView 53 android:id="@+id/tv_content" 54 android:layout_width="wrap_content" 55 android:layout_height="wrap_content" 56 android:layout_gravity="center_vertical" 57 android:text="所包含的内容" /> 58 </LinearLayout> 59 60 </RelativeLayout>
ListView的适配器:
TimeAxisAdapter
1 public class TimeAxisAdapter extends BaseAdapter { 2 3 private List<HashMap<String, Object>> list; 4 5 private Context context; 6 7 private static class ViewHolder { 8 private TextView tvContent; 9 } 10 11 public TimeAxisAdapter(Context context, List<HashMap<String, Object>> list) { 12 this.context = context; 13 this.list = list; 14 } 15 16 @Override 17 public int getCount() { 18 return list.size(); 19 } 20 21 @Override 22 public Object getItem(int position) { 23 return list.get(position); 24 } 25 26 @Override 27 public long getItemId(int position) { 28 return position; 29 } 30 31 @Override 32 public View getView(int position, View convertView, ViewGroup parent) { 33 34 ViewHolder viewHolder = null; 35 36 if (convertView == null) { 37 viewHolder = new ViewHolder(); 38 convertView = LayoutInflater.from(context).inflate( 39 R.layout.time_item, null); 40 viewHolder.tvContent = (TextView) convertView 41 .findViewById(R.id.tv_content); 42 43 viewHolder.tvContent.setText(list.get(position).get("content") 44 .toString()); 45 convertView.setTag(viewHolder); 46 } else { 47 viewHolder = (ViewHolder) convertView.getTag(); 48 49 } 50 return convertView; 51 } 52 }
MainActivity.java
1 public class MainActivity extends Activity { 2 3 private ListView listView; 4 5 private TimeAxisAdapter mTimeAxisAdapter; 6 7 private List<HashMap<String, Object>> list; 8 9 @Override 10 protected void onCreate(Bundle savedInstanceState) { 11 super.onCreate(savedInstanceState); 12 setContentView(R.layout.activity_main); 13 initView(); 14 } 15 16 private void initView() { 17 listView = (ListView) findViewById(R.id.listView); 18 listView.setDividerHeight(0); 19 mTimeAxisAdapter = new TimeAxisAdapter(this, getList()); 20 listView.setAdapter(mTimeAxisAdapter); 21 22 } 23 24 public List<HashMap<String, Object>> getList() { 25 List<HashMap<String, Object>> listChild = new ArrayList<HashMap<String, Object>>(); 26 HashMap<String, Object> map = new HashMap<String, Object>(); 27 map.put("content", "111111111111111111"); 28 listChild.add(map); 29 HashMap<String, Object> map1 = new HashMap<String, Object>(); 30 map1.put("content", "2222222222222"); 31 listChild.add(map1); 32 HashMap<String, Object> map2 = new HashMap<String, Object>(); 33 map2.put("content", "333333333333333333"); 34 listChild.add(map2); 35 HashMap<String, Object> map3 = new HashMap<String, Object>(); 36 map3.put("content", "444444444444444444"); 37 listChild.add(map3); 38 HashMap<String, Object> map4 = new HashMap<String, Object>(); 39 map4.put("content", "5555555555555555"); 40 listChild.add(map4); 41 HashMap<String, Object> map5 = new HashMap<String, Object>(); 42 map5.put("content", "66666666666"); 43 listChild.add(map5); 44 return listChild; 45 } 46 47 }
MainActivity的xml文件:
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:orientation="vertical" 6 tools:context=".MainActivity" > 7 8 <ListView 9 android:id="@+id/listView" 10 android:layout_width="match_parent" 11 android:layout_height="match_parent" > 12 </ListView> 13 14 </LinearLayout>
运行后的效果图: