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：

 <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"
     android:orientation="vertical">

     <RelativeLayout
         android:id="@+id/rl_line"
         android:layout_width="match_parent"
         android:layout_height="50dp">

         <ImageView
             android:id="@+id/iv_left"
             android:layout_width="50dp"
             android:background="#cccccc"
             android:layout_height="match_parent"/>

         <ImageView
             android:id="@+id/iv_right"
             android:layout_width="50dp"
             android:background="#cccccc"
             android:layout_height="match_parent"
             android:layout_alignParentRight="true"/>

         <TextView
             android:id="@+id/tv"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:layout_toRightOf="@id/iv_left"
             android:layout_toLeftOf="@id/iv_right"
             android:background="#ffffff"
             android:text="example"
             android:textSize="17sp"/>

     </RelativeLayout>

 </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：

         if(position % 2 == 0){
             holder.iv_left.setVisibility(View.GONE);
             holder.iv_right.setVisibility(View.VISIBLE);
         }
         else{
             holder.iv_left.setVisibility(View.VISIBLE);
             holder.iv_right.setVisibility(View.GONE);
         }

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：

 public class ListviewAdapter extends BaseAdapter{
     private LayoutInflater inflater;
     private ViewHolder holder;
     private int index = 0;
     private Context c;
     private String string[];

     public ListviewAdapter(Context c,String[] string){
         super();
         this.c = c;
         this.string = string;
         inflater = LayoutInflater.from(c);
     }

     @Override
     public int getCount() {
         // TODO Auto-generated method stub
         return string.length;
     }

     @Override
     public Object getItem(int position) {
         // TODO Auto-generated method stub
         return null;
     }

     @Override
     public long getItemId(int position) {
         // TODO Auto-generated method stub
         return 0;
     }

     @Override
     public View getView(final int position, View convertView, ViewGroup parent) {
         // TODO Auto-generated method stub
         holder = new ViewHolder();
         if(convertView == null){
             convertView = inflater.inflate(R.layout.mylistview, null);
             holder.tv = (TextView)convertView.findViewById(R.id.tv);
             holder.iv_left = (ImageView)convertView.findViewById(R.id.iv_left);
             holder.iv_right = (ImageView)convertView.findViewById(R.id.iv_right);
             convertView.setTag(holder);
         }
         else
             holder = (ViewHolder) convertView.getTag();
         holder.tv.setText(string[position]);

         if(position % 2 == 0){
             holder.iv_left.setVisibility(View.GONE);
             holder.iv_right.setVisibility(View.VISIBLE);
         }
         else{
             holder.iv_left.setVisibility(View.VISIBLE);
             holder.iv_right.setVisibility(View.GONE);
         }
         return convertView;
     }

     public class ViewHolder{
         public TextView tv;
         public ImageView iv_left;
         public ImageView iv_right;
     }

 }

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：

 <RelativeLayout 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"
     android:background="#cccccc"
     tools:context="com.example.listviewdemo.MainActivity" >

     <ListView
         android:id="@+id/lv"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:divider="#cccccc"
         android:dividerHeight="18dp"/>

 </RelativeLayout>

activity_main.xml

以及MainActivity：

 public class MainActivity extends Activity {
     private ListView lv;
     private ListviewAdapter adapter;
     private String[] list = new String[]{"aaa","bbb","ccc","ddd","eee",
             "111","222","333","444","555"};

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         lv = (ListView)findViewById(R.id.lv);
         adapter = new ListviewAdapter(this,list);
         lv.setAdapter(adapter);

         lv.setOnItemClickListener(new myOnItemClickListener());

     }

     private class myOnItemClickListener implements OnItemClickListener {
         @Override
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
             Toast.makeText(getApplicationContext(), "您选择的是：" + list[position],
                     Toast.LENGTH_SHORT).show();
         }
     }

     public void onBackPressed() {
         // TODO Auto-generated method stub
         super.onBackPressed();
     }

 }

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……）