Android 在片段中实现GridView的问题
我正在开发一个小应用程序,其中包含带有Android 在片段中实现GridView的问题,android,gridview,android-fragments,Android,Gridview,Android Fragments,我正在开发一个小应用程序,其中包含带有NavigationDrawer的活动,我使用FragmentManager和FragmentTraction在该活动上放置了一个片段。问题是,我在一个片段中有一个GridView,它没有出现。 这是我的主要活动课 public class Main extends Activity { DrawerLayout drawerlayout; ListView LVdrawer; ImageView toplogo; View
NavigationDrawer
的活动,我使用FragmentManager
和FragmentTraction
在该活动上放置了一个片段。问题是,我在一个片段中有一个GridView
,它没有出现。
这是我的主要活动课
public class Main extends Activity {
DrawerLayout drawerlayout;
ListView LVdrawer;
ImageView toplogo;
View rL;
FragmentManager FM = getFragmentManager();
FragmentTransaction Trans = FM.beginTransaction();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.navigation_drawer);
AddApps Aapps = new AddApps();
drawerlayout = (DrawerLayout) findViewById(R.id.drawer_layout);
LVdrawer = (ListView) findViewById(R.id.left_drawer);
LVdrawer.setAdapter(new CustomAdapter(this, 1));
Trans.add(R.id.content_frame, Aapps, "AddAppsF");
Trans.addToBackStack("AddApps");
Trans.commit();
}
片段类:
public class AddApps extends Fragment {
GridView grid;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View addapp=inflater.inflate(R.layout.addbusiness, container, false);
grid=(GridView) addapp.findViewById(R.id.gridView1);
return addapp;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
grid.setAdapter(new Customadapter(getActivity()));
}
}
class Customadapter extends BaseAdapter {
ArrayList<Row> row;
String[] names;
Context c;
int[] ids;
private LayoutInflater inflater;
public Customadapter(Context c) {
// TODO Auto-generated constructor stub
this.c = c;
inflater=LayoutInflater.from(c);
row = new ArrayList<Row>();
names = new DrawerData().getnames();
ids = new DrawerData().getids();
for (int i = 0; i < ids.length; i++) {
row.add(new Row(names[i], ids[i]));
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return row.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return row.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder1 holder = null;
View singleview = convertView;
if (convertView == null) {
singleview = inflater.inflate(R.layout.singleapp, parent, false);
holder = new ViewHolder1(singleview);
singleview.setTag(holder);
}
else {
holder = (ViewHolder1) singleview.getTag();
}
Row rr = row.get(position);
holder.img.setImageResource(rr.imageid);
holder.det.setText(rr.names);
return singleview;
}
}
class ViewHolder1 {
ImageView img;
TextView det;
ViewHolder1(View v) {
img = (ImageView) v.findViewById(R.id.detail_logo);
det = (TextView) v.findViewById(R.id.detail);
}
}
公共类AddApps扩展片段{
网格视图网格;
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
//TODO自动生成的方法存根
View addapp=充气机。充气(R.layout.addbusiness,container,false);
grid=(GridView)addapp.findviewbyd(R.id.gridView1);
返回addapp;
}
@凌驾
已创建ActivityState上的公共无效(Bundle savedInstanceState){
//TODO自动生成的方法存根
super.onActivityCreated(savedInstanceState);
setAdapter(新的Customadapter(getActivity());
}
}
类Customadapter扩展了BaseAdapter{
阵列列表行;
字符串[]名称;
上下文c;
int[]id;
私人充气机;
公共自定义适配器(上下文c){
//TODO自动生成的构造函数存根
这个.c=c;
充气机=来自(c)的充气机;
行=新的ArrayList();
名称=新抽屉数据().getnames();
ids=新抽屉数据().getids();
for(int i=0;i
您不尊重活动
生命周期。当你这么做的时候
FragmentManager FM = getFragmentManager();
FragmentTransaction Trans = FM.beginTransaction();
在调用方法onCreate
之前,您没有正确创建活动
将该代码移动到onCreate
方法:
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.navigation_drawer);
AddApps Aapps = new AddApps();
drawerlayout = (DrawerLayout) findViewById(R.id.drawer_layout);
LVdrawer = (ListView) findViewById(R.id.left_drawer);
LVdrawer.setAdapter(new CustomAdapter(this, 1));
FragmentManager FM = getFragmentManager();
FragmentTransaction Trans = FM.beginTransaction();
Trans.add(R.id.content_frame, Aapps, "AddAppsF");
Trans.addToBackStack("AddApps");
Trans.commit();
}
您确定新的DroperData().GetId()已被删除吗;返回至少一个项目?是的,返回的项目,我已通过Logcat进行验证…您是否可以在片段中替换View addapp=inflater.inflate(R.layout.addbusiness,container,false)代码>至查看添加应用程序=充气机。充气(R.layout.some\u dummy\u layout,container,false)代码>?其中some\u dummy\u layout
是一个具有简单文本视图的布局。这只是为了看看片段是否做得很好实际上我在片段中有两个文本视图,它们是可见的,甚至gridview也是可见的,但是它的内容是不可见的……谢谢你的回答,我是编程新手,正如你提到的,我更改了代码……我的问题有什么解决方案吗?