Android UI 实现老虎机详解及实例代码

 1.布局添加Listview 2.找到listview 3.创建一个Adapter适配器继承BaseAdapter，封装4个方法，其中getcount,getview必须封装   getcount:告诉listview要显示的条目数   getview：告诉listview每个条目显示的内容。 4.创建Adapter的一个对象，设置给listview。     listview.setAdapter(ListAdapter adapter);

 TextView view = null;   if(convertView != null){//判断converView是否为空，不为空重新使用     view = (TextView) convertView;   }else{     view = new TextView(mContext);//创建一个textView对象   }   return view；

public class MainActivity extends AppCompatActivity {  //1，声明控件LISTVIEW  private ListView listView1;  private ListView listView2;  private ListView listView3;  private Context mContext;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    //2，获取控件的id    listView1 = (ListView)findViewById(R.id.list_item1);    listView2 = (ListView)findViewById(R.id.list_item2);    listView3 = (ListView)findViewById(R.id.list_item3);    mContext = this;    //3,进行绑定    MyAdapter myAdapter = new MyAdapter();    listView3.setAdapter(myAdapter);    listView2.setAdapter(myAdapter);    listView1.setAdapter(myAdapter);  }  //创建适配器类实现接口  class MyAdapter extends BaseAdapter{    @Override    public int getCount() {      return 50;    }    @Override    public Object getItem(int i) {      return null;    }    @Override    public long getItemId(int i) {      return 0;    }    @Override    public View getView(int i, View view, ViewGroup viewGroup) {      //声明一个textview对象      TextView view0 = null;      //进行判断是否能过复用      if(view != null){        view0 = (TextView)view;      }else {        view0 = new TextView(mContext);      }      view0.setTextSize(40);      Random random = new Random();      int num = random.nextInt(100);      if(num<20){        view0.setText("桃");        view0.setTextColor(Color.parseColor("#ff00ff"));      }else if(num<40){        view0.setText("梨");        view0.setTextColor(Color.YELLOW);      }else if(num<60){        view0.setText("枣");        view0.setTextColor(Color.RED);      }else if(num<80){        view0.setText("橘");        view0.setTextColor(Color.parseColor("#d4824f"));      }else{        view0.setText("杏");        view0.setTextColor(Color.parseColor("#00ff00"));      }      return view0;    }  }}

<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"  tools:context="com.wenkai.tigerlistview.MainActivity">  <ListView    android:id="@+id/list_item1"    android:layout_width="0dp"    android:layout_height="wrap_content"    android:layout_weight="1" />  <ListView    android:id="@+id/list_item2"    android:layout_width="0dp"    android:layout_height="wrap_content"    android:layout_weight="1" />  <ListView    android:id="@+id/list_item3"    android:layout_width="0dp"    android:layout_height="wrap_content"    android:layout_weight="1" /></LinearLayout>