实现水平滑动，并且动态添加数据

来源：互联网发布：matlab无法读取txt数据编辑：程序博客网时间：2024/06/11 23:52

需求就是实现如果所示的，水平滑动，但是item个数不确定。

一开始遇到，就把item独立出来，用HorizontalScrollView去实现水平滑动，在里面的子LinearLayout里面去动态的添加item内容，这样可以实现，不过不好控制，不是特别方便，后来在网上找到了下面这个方法：

用HorizontalScrollView实现水平滑动，在里面的子LinearLayout里面嵌套了GridView来实现动态的添加数据

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <HorizontalScrollView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_margin="5dp" >        <LinearLayout            android:layout_width="wrap_content"            android:layout_height="fill_parent"            android:layout_margin="10dp" >            <GridView                android:id="@+id/grid"                android:layout_width="fill_parent"                android:layout_height="fill_parent"                android:gravity="center"                android:numColumns="auto_fit"                android:stretchMode="spacingWidthUniform" >            </GridView>        </LinearLayout>    </HorizontalScrollView></LinearLayout>

重点在于setGridView方法里面的代码

public class MainActivity extends Activity {    List<CityItem> cityList;    RelativeLayout itmel;    GridView gridView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);//        LayoutInflater layoutInflater = getLayoutInflater();        gridView = (GridView) findViewById(R.id.grid);        setData();        setGridView();    }    private void setData() {        cityList = new ArrayList<CityItem>();        CityItem item = new CityItem();        item.setCityName("深圳");        item.setCityCode("0755");        cityList.add(item);        item = new CityItem();        item.setCityName("上海");        item.setCityCode("021");        cityList.add(item);        item = new CityItem();        item.setCityName("广州");        item.setCityCode("020");        cityList.add(item);        item = new CityItem();        item.setCityName("北京");        item.setCityCode("010");        cityList.add(item);        item = new CityItem();        item.setCityName("武汉");        item.setCityCode("027");        cityList.add(item);        item = new CityItem();        item.setCityName("孝感");        item.setCityCode("0712");        cityList.add(item);        cityList.addAll(cityList);    }    private void setGridView() {        int size = cityList.size();        int length = 100;        DisplayMetrics dm = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(dm);        float density = dm.density;        int gridviewWidth = (int) (size * (length + 4) * density);        int itemWidth = (int) (length * density);        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(                gridviewWidth, LinearLayout.LayoutParams.MATCH_PARENT);        gridView.setLayoutParams(params); // 重点        gridView.setColumnWidth(itemWidth); // 重点        gridView.setHorizontalSpacing(5); // 间距        gridView.setStretchMode(GridView.NO_STRETCH);        gridView.setNumColumns(size); // 重点        MyTopicGridViewAdapter adapter = new MyTopicGridViewAdapter(getApplicationContext(),                cityList);        gridView.setAdapter(adapter);    }}

剩余的就是item布局、item对象、adapter

item布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/itemlayout"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="vertical" >    <ImageView        android:id="@+id/ItemImage"        android:layout_width="80.0dip"        android:layout_height="80.0dip"        android:layout_gravity="center_horizontal"        android:src="@drawable/china" >    </ImageView>    <TextView        android:id="@+id/tvCity"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:text="Title"        android:textColor="#000000" >    </TextView>    <TextView        android:id="@+id/tvCode"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:text="Info"        android:textColor="#000000" >    </TextView></LinearLayout>

item对象：

public class CityItem {    private String cityName;    private String cityCode;    public String getCityName() {        return cityName;    }    public void setCityName(String cityName) {        this.cityName = cityName;    }    public String getCityCode() {        return cityCode;    }    public void setCityCode(String cityCode) {        this.cityCode = cityCode;    }}

adapter

public class MyTopicGridViewAdapter extends BaseAdapter {    Context context;    List<CityItem> list;    public MyTopicGridViewAdapter(Context _context, List<CityItem> _list) {        this.list = _list;        this.context = _context;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int position) {        return list.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        LayoutInflater layoutInflater = LayoutInflater.from(context);        convertView = layoutInflater.inflate(R.layout.list_item, null);        TextView tvCity = (TextView) convertView.findViewById(R.id.tvCity);        TextView tvCode = (TextView) convertView.findViewById(R.id.tvCode);        CityItem city = list.get(position);        tvCity.setText(city.getCityName());        tvCode.setText(city.getCityCode());        return convertView;    }}

0 0