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"?>

    
    
    
    
    
        
        
        
        
        
    

//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();
        }
      }
    });
  }
}