ViewPager布局
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="10" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#000" />
<RadioGroup
android:id="@+id/radio"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.5"
android:orientation="horizontal">
<RadioButton
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:button="@null"
android:gravity="center"
android:text="首页"
android:textSize="25sp" />
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:background="#000" />
<RadioButton
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:button="@null"
android:gravity="center"
android:text="新闻"
android:textSize="25sp" />
</RadioGroup>
</LinearLayout>
Pager布局
/*******************listview布局******************/
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
/*******************gridview布局******************/
<GridView
android:id="@+id/gridview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:horizontalSpacing="1dp"
android:verticalSpacing="1dp"
android:numColumns="2" />
MainActivity(继承FragmentActivity)
//找控件
final ViewPager pager = findViewById(R.id.pager);
final RadioGroup radio = findViewById(R.id.radio);
//默认选中
radio.check(radio.getChildAt(0).getId());
//创建集合
final ArrayList<Fragment> list = new ArrayList<>();
//吧Fragment添加进去
Frag01 frag01 = new Frag01();
Frag02 frag02 = new Frag02();
list.add(frag01);
list.add(frag02);
//适配器
pager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int i) {
return list.get(i);
}
@Override
public int getCount() {
return list.size();
}
});
//页面切换
pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int i, float v, int i1) {
}
@Override
public void onPageSelected(int i) {
//按钮跟着切换
radio.check(radio.getChildAt(i).getId());
}
@Override
public void onPageScrollStateChanged(int i) {
}
});
//点击按钮切换viewpager
radio.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch (checkedId){
case R.id.button1:
pager.setCurrentItem(0);
break;
case R.id.button2:
pager.setCurrentItem(1);
break;
}
}
});
}
Frag01(Frag02和01一样，只要把ListView换成GridView)
public class Frag01 extends Fragment {
private ListView listview;
private int page = 1;
private String path = "http://www.xieast.com/api/news/news.php";
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.frag_01, container, false);
listview = view.findViewById(R.id.listview);
//动态注册广播监听网络状态
NetWorkBroadcastReceiver receiver = new NetWorkBroadcastReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
getActivity().registerReceiver(receiver, intentFilter);
return view;
}
//定义广播监听网络状态
private class NetWorkBroadcastReceiver extends BroadcastReceiver {
//重写接收广播的方法
@Override
public void onReceive(Context context, Intent intent) {
//判断是否有网
boolean netWorkConnect = NetWorkUtil.isNetWorkConnect(context);
if (netWorkConnect) {
Toast.makeText(getActivity(), "有网", Toast.LENGTH_SHORT).show();
//获取网络数据
getServerData();
//判断完了类型，吐司
boolean wifi = NetWorkUtil.isWifi(context);
if (wifi) {
Toast.makeText(getActivity(), "wifi", Toast.LENGTH_SHORT).show();
} else {
boolean mobile = NetWorkUtil.isMobile(context);
if (mobile) {
Toast.makeText(getActivity(), "mobile", Toast.LENGTH_SHORT).show();
}
}
} else {
Toast.makeText(getActivity(), "没网", Toast.LENGTH_SHORT).show();
//没网，弹框设置网络
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("设置网络");
builder.setMessage("是否设置网络");
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//整体(wifi+mobile):
startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));
//WIFI:
//startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
//流量:
//startActivity(new Intent(android.provider.Settings.ACTION_DATA_ROAMING_SETTINGS));
}
});
builder.setNegativeButton("取消",null);
builder.show();
}
}
}
private void getServerData() {
//获取网络数据
MyAsyncTask task = new MyAsyncTask();
//执行异步任务
task.execute(path + "?page=" + page);
}
private class MyAsyncTask extends AsyncTask<String, Integer, String> {
//做耗时操作
@Override
protected String doInBackground(String... parmas) {
String uri = parmas[0];
//把接口地址包装成网络地址
try {
URL url = new URL(uri);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
conn.setReadTimeout(5000);
if(conn.getResponseCode()==200){
InputStream stream = conn.getInputStream();
ByteArrayOutputStream stream1 = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int len=0;
while ((len=stream.read(bytes))!=-1){
stream1.write(bytes,0,len);
}
publishProgress(10,2);
stream.close();
stream1.close();
String json = stream1.toString();
return json;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
//更新UI
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.i("abc",s);
//gson解析成bean对象
Gson gson = new Gson();
JsonBean fromJson = gson.fromJson(s, JsonBean.class);
ArrayList<Data> data = fromJson.getData();
//listview适配器
MyAdapter myAdapter = new MyAdapter(getActivity(),data);
listview.setAdapter(myAdapter);
}
}
}
NetWorkUtil(判断网络状态)
public class NetWorkUtil {
//判断是否有网
public static boolean isNetWorkConnect(Context context) {
//获取网络连接状态管理器
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
//得到网络信息
NetworkInfo info = cm.getActiveNetworkInfo();
if (info != null) {
return info.isAvailable();
}
return false;
}
//判断是WiFi
public static boolean isWifi(Context context) {
//获取网络连接状态管理器
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
//从网络连接管理器中获取WiFi
NetworkInfo wifi = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (wifi != null) {
return true;
}
return false;
}
//判断是流量
public static boolean isMobile(Context context) {
//获取网络连接状态管理器
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
//从网络连接管理器中获取流量
NetworkInfo Mobile = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (Mobile != null) {
return true;
}
return false;
}
}
MyAdapter(适配器以及ListView优化)
public class MyAdapter extends BaseAdapter {
private Context context;
private ArrayList<Data> list;
public MyAdapter(Context context, ArrayList<Data> list) {
this.context = context;
this.list = list;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHandler handler;
if (convertView == null) {
convertView = View.inflate(context, R.layout.item_layout, null);
handler = new ViewHandler();
handler.text1 = convertView.findViewById(R.id.textview1);
handler.text2 = convertView.findViewById(R.id.textview2);
convertView.setTag(handler);
} else {
handler = (ViewHandler) convertView.getTag();
}
handler.text1.setText(list.get(position).getTitle());
handler.text2.setText(list.get(position).getDate());
return convertView;
}
class ViewHandler {
private TextView text1, text2;
}
}