Android开发之ListView的简单用法及定制ListView界面操作示例

<?xml version="1.0" encoding="utf-8"? 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".MainActivity"
  android:orientation="vertical" 
    <!--使用红色得分割条-- 
    <ListView
      android:id="@+id/list1"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:divider="#f00"
      android:dividerHeight="2px"
      android:headerDividersEnabled="false" 
    </ListView 
    <!--用于存放和发送新的信息-- 
    <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:orientation="vertical"
      android:background="#ffffff" 
        <!--存放新的信息-- 
        <!--设置最大行数-- 
        <EditText
          android:id="@+id/ifo"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:hint="请输入内容"
          android:textColorHint="#c0c0c0"
          android:maxLines="6"/ 
        <!--点击发送消息-- 
        <Button
          android:id="@+id/send"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="发送"
          android:textSize="16sp" / 
    </LinearLayout 
</RelativeLayout 

//此处由于只有String一条数据，所以只用了ArrayAdapter
//如果多项信息建议用BaseAdapter
public class MainActivity extends AppCompatActivity {
  //当前消息列表
  ListView list01 ;
  //消息发送栏
  EditText editText01 ;
  //消息发送按钮
  Button button01_send ;
  //记录数组长度
  int arr_num = 0;
  //定义一个数组
  String[] arr1 = new String[arr_num];
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    list01 = (ListView) findViewById(R.id.list1);
    editText01 = (EditText) findViewById(R.id.ifo);
    button01_send = (Button) findViewById(R.id.send);
    button01_send.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        if ( ! editText01.getText().toString().equals("") ){
          String[] arr_new = new String[++arr_num];
//        System.arraycopy(arr1,0,arr_new,0, arr1.length);
          for (int j = 0 ; j < arr1.length; j++){
            arr_new[j] = arr1[j];
          }
          arr_new[arr_num-1] = editText01.getText().toString();
          arr1 = arr_new;
          ArrayAdapter adapter1;
          adapter1 = new ArrayAdapter< (MainActivity.this,R.layout.array_list,arr_new);
          list01.setAdapter(adapter1);
          editText01.setText("");
        }else {
          Toast.makeText(MainActivity.this,"请输入后再发送",Toast.LENGTH_SHORT).show();
        }
      }
    });
  }
}