Android中ListView错位布局实现(无聊向)

由于某些原因,需要个错位的页面,在网上找不到好的例子,试着动手写了写。

不考虑配色的完成图如下:

 

 

首先考虑的是,listview每一行左右都有可能缩进。

先假设一行的布局就是ImageView,TextView,ImageView,代码如下:

 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     
 7     <RelativeLayout
 8         android:id="@+id/rl_line"
 9         android:layout_width="match_parent"
10         android:layout_height="50dp">
11         
12         <ImageView 
13             android:id="@+id/iv_left"
14             android:layout_width="50dp"
15             android:background="#cccccc"
16             android:layout_height="match_parent"/>
17         
18         <ImageView
19             android:id="@+id/iv_right"
20             android:layout_width="50dp"
21             android:background="#cccccc"
22             android:layout_height="match_parent"
23             android:layout_alignParentRight="true"/>
24 
25         <TextView 
26             android:id="@+id/tv"
27             android:layout_width="match_parent"
28             android:layout_height="match_parent"
29             android:layout_toRightOf="@id/iv_left"
30             android:layout_toLeftOf="@id/iv_right"
31             android:background="#ffffff"
32             android:text="example"
33             android:textSize="17sp"/>
34     
35     </RelativeLayout>
36 
37 </LinearLayout>

 

接下来要考虑,如何保证一行靠左,一行靠右呢?

可以通过判断行数,来选择ImageView是否显示,大致如下:

1         if(position % 2 == 0){
2             holder.iv_left.setVisibility(View.GONE);
3             holder.iv_right.setVisibility(View.VISIBLE);
4         }
5         else{
6             holder.iv_left.setVisibility(View.VISIBLE);
7             holder.iv_right.setVisibility(View.GONE);
8         }

之所以还要设置Visibile,是因为第一项和最后一项因为某些原因,会不隐藏ImageView。

这处代码也可以精简。

完成的自定义Adapter如下:

 1 public class ListviewAdapter extends BaseAdapter{
 2     private LayoutInflater inflater;
 3     private ViewHolder holder;
 4     private int index = 0;
 5     private Context c;
 6     private String string[];
 7     
 8     public ListviewAdapter(Context c,String[] string){
 9         super();
10         this.c = c;
11         this.string = string;
12         inflater = LayoutInflater.from(c);
13     }
14     
15     @Override
16     public int getCount() {
17         // TODO Auto-generated method stub
18         return string.length;
19     }
20 
21     @Override
22     public Object getItem(int position) {
23         // TODO Auto-generated method stub
24         return null;
25     }
26 
27     @Override
28     public long getItemId(int position) {
29         // TODO Auto-generated method stub
30         return 0;
31     }
32 
33     @Override
34     public View getView(final int position, View convertView, ViewGroup parent) {
35         // TODO Auto-generated method stub
36         holder = new ViewHolder();
37         if(convertView == null){
38             convertView = inflater.inflate(R.layout.mylistview, null);
39             holder.tv = (TextView)convertView.findViewById(R.id.tv);
40             holder.iv_left = (ImageView)convertView.findViewById(R.id.iv_left);
41             holder.iv_right = (ImageView)convertView.findViewById(R.id.iv_right);
42             convertView.setTag(holder);
43         }
44         else
45             holder = (ViewHolder) convertView.getTag();
46         holder.tv.setText(string[position]);
47         
48         if(position % 2 == 0){
49             holder.iv_left.setVisibility(View.GONE);
50             holder.iv_right.setVisibility(View.VISIBLE);
51         }
52         else{
53             holder.iv_left.setVisibility(View.VISIBLE);
54             holder.iv_right.setVisibility(View.GONE);
55         }
56         return convertView;
57     }
58     
59     public class ViewHolder{
60         public TextView tv;
61         public ImageView iv_left;
62         public ImageView iv_right;
63     }
64 
65 }
ListviewAdapter.java

 

由于两个ImageView设置了颜色为#cccccc,为了保证看起来像一体的,listview的间距和整个页面背景都要设置为#CCCCCC。

activity_main的代码如下:

 1 <RelativeLayout 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:background="#cccccc"
 6     tools:context="com.example.listviewdemo.MainActivity" >
 7 
 8     <ListView
 9         android:id="@+id/lv"
10         android:layout_width="match_parent"
11         android:layout_height="match_parent"
12         android:divider="#cccccc"
13         android:dividerHeight="18dp"/>
14 
15 </RelativeLayout>
activity_main.xml

 

以及MainActivity:

 1 public class MainActivity extends Activity {
 2     private ListView lv;
 3     private ListviewAdapter adapter;
 4     private String[] list = new String[]{"aaa","bbb","ccc","ddd","eee",
 5             "111","222","333","444","555"};
 6     
 7     @Override
 8     protected void onCreate(Bundle savedInstanceState) {
 9         super.onCreate(savedInstanceState);
10         setContentView(R.layout.activity_main);
11         lv = (ListView)findViewById(R.id.lv);
12         adapter = new ListviewAdapter(this,list);
13         lv.setAdapter(adapter);
14         
15         lv.setOnItemClickListener(new myOnItemClickListener());
16         
17     }
18     
19     private class myOnItemClickListener implements OnItemClickListener {
20         @Override
21         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
22             Toast.makeText(getApplicationContext(), "您选择的是:" + list[position],
23                     Toast.LENGTH_SHORT).show();
24         }
25     }
26     
27     public void onBackPressed() {
28         // TODO Auto-generated method stub
29         super.onBackPressed();
30     }
31 
32 }
MainActivity.java

 

因为只考虑了实现页面,没有考虑功能,故点击操作只有Toast提示。

如果有好的点子,大概会用这个样式写点什么吧

 

这样的布局好不好看,仁者见仁智者见智……

 

 

 

2015.8.13更新:

试着改了改,弄出下面的效果图:

事实证明,还是有点用处的嘛(我果然太闲了……)

posted @ 2015-08-10 14:03  菊草叶与圆企鹅  阅读(1181)  评论(2编辑  收藏  举报