Мое приложение для Android должно заполнить ListView текстом из веб-запроса одним нажатием кнопки (на панели инструментов). Вопрос в том, что я работаю со скользящими вкладками с панелью инструментов, и просмотр списка остается на tab_1.xml. когда я нажимаю на кнопку, у меня есть исключение с нулевым указателем в «populateList». Может ли кто-нибудь помочь?Android - просмотр списка - PopulateList
ОСНОВНЫЕ ACTIVITY.JAVA
public class MainActivity extends ActionBarActivity {
private Toolbar mToolbar;
ViewPager pager;
ViewPagerAdapter adapter;
SlidingTabLayout tabs;
CharSequence Titles[]={"Home","Mês"};
int Numboftabs =2;
List<ValorWeb> valores = new ArrayList<ValorWeb>();
ListView valorListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.tool_bar);
mToolbar.setTitle("Projeto Hidro Teste");
setSupportActionBar(mToolbar);
valorListView = (ListView) findViewById(R.id.listView);
adapter = new ViewPagerAdapter(getSupportFragmentManager(), Titles, Numboftabs);
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true);
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
@Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.tabsScrollColor);
}
});
tabs.setViewPager(pager);
}
private void populateList(){
ArrayAdapter<ValorWeb> adapter = new ValorWebListAdapter();
valorListView.setAdapter(adapter);
}
private void addvalor(String valor,String data){
valores.add(new ValorWeb(valor, data));
}
private class ValorWebListAdapter extends ArrayAdapter<ValorWeb>{
public ValorWebListAdapter(){
super (MainActivity.this,R.layout.listview_item,valores);
}
@Override
public View getView(int position,View view,ViewGroup parent) {
if (view == null)
view = getLayoutInflater().inflate(R.layout.listview_item, parent, false);
ValorWeb currentValorWeb = valores.get(position);
TextView valor = (TextView) view.findViewById(R.id.valortext);
valor.setText(currentValorWeb.getValor());
TextView data = (TextView) view.findViewById(R.id.datatext);
data.setText(currentValorWeb.getData());
return view;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_refresh:
String textFileUrl = "http://2015projetohidro.esy.es/arquivo.txt";
String textFileText = "";
Request httpRequest = new Request();
httpRequest.execute(textFileUrl);
try {
textFileText = httpRequest.get(5000, TimeUnit.MILLISECONDS);
} catch (InterruptedException | ExecutionException | TimeoutException e) {
e.printStackTrace();
}
System.out.println("The online text file contains: " + textFileText);
TextView textView = (TextView) findViewById(R.id.textConsumo);
textView.setText(textFileText);
String currentDateString = DateFormat.getDateInstance().format(new Date());
TextView textdata = (TextView) findViewById(R.id.textData);
textdata.setText(currentDateString);
String currentTimeString = DateFormat.getTimeInstance().format(new Date());
TextView textTime = (TextView) findViewById(R.id.texttime);
textTime.setText(currentTimeString);
addvalor(textView.getText().toString(),textdata.getText().toString());
Toast.makeText(this,"Atualizando Consumo",Toast.LENGTH_LONG).show();
populateList();
return true;
default:
return super.onOptionsItemSelected(item);
}
}}
ACTIVITYMAIN.XML
<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"
android:orientation="vertical"
tools:context=".MainActivity">
<include
android:id="@+id/tool_bar"
layout="@layout/tool_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<tabs.SlidingTabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/ColorPrimary"
android:elevation="2dp" />
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">
</android.support.v4.view.ViewPager>
TAB_1.XML
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="0.0000"
android:id="@+id/textConsumo"
android:layout_gravity="center_horizontal"
android:layout_marginTop="45dp"
android:layout_marginRight="81dp"
android:textSize="45dp"
android:textColor="@color/ColorPrimary"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="m³"
android:textSize="22dp"
android:layout_gravity="center_horizontal"
android:layout_marginLeft="15dp"
android:layout_marginTop="-31dp"
android:textColor="@color/ColorPrimary"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="data"
android:textSize="17dp"
android:id="@+id/textData"
android:textColor="@color/ColorPrimary"
android:layout_marginTop="8dp"
android:layout_marginLeft="45dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="time"
android:id="@+id/texttime"
android:textColor="@color/ColorPrimary"
android:textSize="17dp"
android:layout_marginTop="-23dp"
android:layout_marginLeft="175dp" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/listView"
android:layout_marginTop="35dp" />
TAB_1.JAVA
public class Tab1 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view =inflater.inflate(R.layout.tab_1,container,false);
return view;
}}
LOG
04-12 19:13:49.320 14496-14496/app.claudio.slidingtabs E/SELinux﹕ selinux_android_seapp_context_reload: Error reading /seapp_contexts, line 16, name levelFrom, value container
04-12 19:13:59.600 14496-14496/app.claudio.slidingtabs E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at app.claudio.slidingtabs.MainActivity.populateList(MainActivity.java:70)
at app.claudio.slidingtabs.MainActivity.onOptionsItemSelected(MainActivity.java:150)
at android.app.Activity.onMenuItemSelected(Activity.java:2640)
at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:350)
at android.support.v7.app.ActionBarActivity.onMenuItemSelected(ActionBarActivity.java:152)
at android.support.v7.app.ActionBarActivityDelegate$1.onMenuItemSelected(ActionBarActivityDelegate.java:75)
at android.support.v7.widget.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:44)
at android.support.v7.internal.app.ToolbarActionBar$2.onMenuItemClick(ToolbarActionBar.java:76)
at android.support.v7.widget.Toolbar$1.onMenuItemClick(Toolbar.java:164)
at android.support.v7.widget.ActionMenuView$MenuBuilderCallback.onMenuItemSelected(ActionMenuView.java:738)
at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:802)
at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:153)
at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:949)
at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:939)
at android.support.v7.widget.ActionMenuView.invokeItem(ActionMenuView.java:596)
at android.support.v7.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:145)
at android.view.View.performClick(View.java:4476)
at android.view.View$PerformClick.run(View.java:18795)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5493)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1225)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1041)
at dalvik.system.NativeStart.main(Native Method)
Опубликовать логин – Josef
Выполнено, опубликовано –
Это не тот человек! у вас есть просмотр списка в TAB1 xml и как вы можете найти его в действии? найти его внутри фрагмента. Вот почему это нулевой указатель. – Harry