Android - 将搜索栏添加到自定义列表视图和简单适配器
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【中文标题】Android - 将搜索栏添加到自定义列表视图和简单适配器【英文标题】：Android - Adding search-bar to custom-list-view & simple adaptor 【发布时间】：2017-11-23 20:22:21 【问题描述】：我尝试使用HashMaps 的Array 创建自定义ListView 和填充值。 UI 显示正常：
但每当在搜索框中输入任何内容时，应用都会关闭并显示Unfortunately app is stopped。
我搜索了很多，但无法完成。
也许我尝试应用过滤器的方法是错误的？
代码如下：
public class MyCustomListView extends ListActivity
SimpleAdapter adapter;
EditText inputSearch;
static final ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String,String>>();
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_list_view);
inputSearch = (EditText) findViewById(R.id.search);
ImageView si = (ImageView) findViewById(R.id.search_icon);
si.setImageResource(R.drawable.blue_search);
adapter = new SimpleAdapter(
this,
list,
R.layout.custom_row_view,
new String[] "img","name","dob","anniversary",
new int[] R.id.image,R.id.text1,R.id.text2, R.id.text3
);
try
getItemFromXMLandPopulateList(this); // gets the complete list
catch (Exception e)
Toast.makeText(this, "Error:\n" + e, Toast.LENGTH_LONG).show();
setListAdapter(adapter);
// Capture Text in EditText
inputSearch.addTextChangedListener(new TextWatcher()
@Override
public void onTextChanged(CharSequence s, int start, int before, int count)
adapter.getFilter().filter(s);
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after)
@Override
public void afterTextChanged(Editable s)
);
private void getItemFromXMLandPopulateList(Activity activity) throws XmlPullParserException, IOException
Resources res = activity.getResources();
XmlResourceParser xpp = res.getXml(R.xml.db);
String id=null, name=null, dob=null, anniversary=null;
xpp.next();
int eventType = xpp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT)
switch(eventType)
case XmlPullParser.START_TAG:
String tagname = xpp.getName();
if(tagname.equals("ID"))
eventType = xpp.next();
if (eventType == XmlPullParser.TEXT)
id = xpp.getText();
else if(tagname.equals("Name"))
eventType = xpp.next();
if (eventType == XmlPullParser.TEXT)
name = xpp.getText();
else if(tagname.equals("DOB"))
eventType = xpp.next();
if (eventType == XmlPullParser.TEXT)
dob = xpp.getText();
else if(tagname.equals("Anniversary"))
eventType = xpp.next();
if (eventType == XmlPullParser.TEXT)
anniversary = xpp.getText();
break;
case XmlPullParser.END_TAG:
if(xpp.getName().equals("F"))
// Adding 3 value hash to array-list
HashMap<String,String> temp = new HashMap<String,String>();
temp.put("img", Integer.toString(R.mipmap.profile));
temp.put("id", id);
temp.put("name", name);
temp.put("dob", dob);
temp.put("anniversary", anniversary);
list.add(temp);
// Clearing values for next set
id=""; name = ""; dob = ""; anniversary = "";
break;
default:
break;
eventType = xpp.next();
protected void onListItemClick(ListView l, View v, int position, long id)
super.onListItemClick(l, v, position, id);
HashMap<String, String> item = (HashMap<String, String>) getListAdapter().getItem(position);
String xmlFile = "r" + item.get("id");
String name = item.get("name");
//Toast.makeText(this, "Showing details of: " + name, Toast.LENGTH_LONG).show();
Intent intent = new Intent(this, ShowDetails.class);
intent.putExtra("xml", xmlFile);
startActivity(intent);
下面粘贴的崩溃日志，好像是NullPointerException，但不知道如何解决。
I/ActivityManager( 1596): Displayed com.karthikhiraskar.samplesqlitedb/.MyCustomListView: +237ms
W/Filter (10785): An exception occured during performFiltering()!
W/Filter (10785): java.lang.NullPointerException
W/Filter (10785): at android.widget.SimpleAdapter$SimpleFilter.performFiltering(SimpleAdapter.java:354)
W/Filter (10785): at android.widget.Filter$RequestHandler.handleMessage(Filter.java:234)
W/Filter (10785): at android.os.Handler.dispatchMessage(Handler.java:102)
W/Filter (10785): at android.os.Looper.loop(Looper.java:136)
W/Filter (10785): at android.os.HandlerThread.run(HandlerThread.java:61)
I/LatinIME:LogUtils( 1692): Dictionary info: dictionary = contacts.en_US.dict ; version = ? ; date = ?
D/AndroidRuntime(10785): Shutting down VM
W/dalvikvm(10785): threadid=1: thread exiting with uncaught exception (group=0xacd4eb20)
E/AndroidRuntime(10785): FATAL EXCEPTION: main
E/AndroidRuntime(10785): Process: com.karthikhiraskar.samplesqlitedb, PID: 10785
E/AndroidRuntime(10785): java.lang.NullPointerException
E/AndroidRuntime(10785): at android.widget.SimpleAdapter.getCount(SimpleAdapter.java:93)
E/AndroidRuntime(10785): at android.widget.AdapterView.checkFocus(AdapterView.java:713)
E/AndroidRuntime(10785): at android.widget.AdapterView$AdapterDataSetObserver.onInvalidated(AdapterView.java:836)
E/AndroidRuntime(10785): at android.widget.AbsListView$AdapterDataSetObserver.onInvalidated(AbsListView.java:6288)
E/AndroidRuntime(10785): at android.database.DataSetObservable.notifyInvalidated(DataSetObservable.java:50)
E/AndroidRuntime(10785): at android.widget.BaseAdapter.notifyDataSetInvalidated(BaseAdapter.java:59)
E/AndroidRuntime(10785): at android.widget.SimpleAdapter$SimpleFilter.publishResults(SimpleAdapter.java:383)
E/AndroidRuntime(10785): at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282)
E/AndroidRuntime(10785): at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime(10785): at android.os.Looper.loop(Looper.java:136)
E/AndroidRuntime(10785): at android.app.ActivityThread.main(ActivityThread.java:5017)
E/AndroidRuntime(10785): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(10785): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime(10785): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
E/AndroidRuntime(10785): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
E/AndroidRuntime(10785): at dalvik.system.NativeStart.main(Native Method)
W/ActivityManager( 1596): Force finishing activity com.karthikhiraskar.samplesqlitedb/.MyCustomListView
D/dalvikvm( 1596): GC_FOR_ALLOC freed 505K, 21% free 9295K/11692K, paused 7ms, total 7ms
W/ActivityManager( 1596): Activity pause timeout for ActivityRecordad45ab60 u0 com.karthikhiraskar.samplesqlitedb/.MyCustomListView t59 f
E/SoundPool( 1596): error loading /system/media/audio/ui/Effect_Tick.ogg
W/Audioservice( 1596): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
E/SoundPool( 1596): error loading /system/media/audio/ui/Effect_Tick.ogg
W/AudioService( 1596): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
E/SoundPool( 1596): error loading /system/media/audio/ui/Effect_Tick.ogg
W/AudioService( 1596): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
E/SoundPool( 1596): error loading /system/media/audio/ui/Effect_Tick.ogg
W/AudioService( 1596): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
E/SoundPool( 1596): error loading /system/media/audio/ui/Effect_Tick.ogg
W/AudioService( 1596): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
E/SoundPool( 1596): error loading /system/media/audio/ui/KeypressStandard.ogg
W/AudioService( 1596): Soundpool could not load file: /system/media/audio/ui/KeypressStandard.ogg
E/SoundPool( 1596): error loading /system/media/audio/ui/KeypressSpacebar.ogg
W/AudioService( 1596): Soundpool could not load file: /system/media/audio/ui/KeypressSpacebar.ogg
E/SoundPool( 1596): error loading /system/media/audio/ui/KeypressDelete.ogg
W/AudioService( 1596): Soundpool could not load file: /system/media/audio/ui/KeypressDelete.ogg
E/SoundPool( 1596): error loading /system/media/audio/ui/KeypressReturn.ogg
W/AudioService( 1596): Soundpool could not load file: /system/media/audio/ui/KeypressReturn.ogg
I/Process (10785): Sending signal. PID: 10785 SIG: 9
E/SoundPool( 1596): error loading /system/media/audio/ui/KeypressInvalid.ogg
W/AudioService( 1596): Soundpool could not load file: /system/media/audio/ui/KeypressInvalid.ogg
W/AudioService( 1596): onLoadSoundEffects(), Error -1 while loading samples
W/InputDispatcher( 1596): channel 'ad54e4b0 com.karthikhiraskar.samplesqlitedb/com.karthikhiraskar.samplesqlitedb.MyCustomListView (server)' ~ Consumer closed input channel or an error occurred. events=0x9
E/InputDispatcher( 1596): channel 'ad54e4b0 com.karthikhiraskar.samplesqlitedb/com.karthikhiraskar.samplesqlitedb.MyCustomListView (server)' ~ Channel is unrecoverably broken and will be disposed!
I/ActivityManager( 1596): Process com.karthikhiraskar.samplesqlitedb (pid 10785) has died.
W/InputDispatcher( 1596): Attempted to unregister already unregistered input channel 'ad54e4b0 com.karthikhiraskar.samplesqlitedb/com.karthikhiraskar.samplesqlitedb.MyCustomListView (server)'
W/Binder ( 1692): Caught a RuntimeException from the binder stub implementation.
W/Binder ( 1692): java.lang.NullPointerException
W/Binder ( 1692): at android.inputmethodservice.IInputMethodWrapper.setSessionEnabled(IInputMethodWrapper.java:280)
W/Binder ( 1692): at com.android.internal.view.IInputMethod$Stub.onTransact(IInputMethod.java:129)
W/Binder ( 1692): at android.os.Binder.execTransact(Binder.java:404)
W/Binder ( 1692): at dalvik.system.NativeStart.run(Native Method)
W/SurfaceFlinger( 1162): couldn't log to binary event log: overflow.
I/WindowState( 1596): WIN DEATH: Windowad54e4b0 u0 com.karthikhiraskar.samplesqlitedb/com.karthikhiraskar.samplesqlitedb.MyCustomListView
W/InputMethodManagerService( 1596): Got RemoteException sending setActive(false) notification to pid 10785 uid 10060
W/PlatformStatsUtil( 2013): Could not retrieve Usage & Diagnostics setting. Giving up.
【问题讨论】：
您阅读过崩溃报告吗？在此处添加崩溃日志。 @KarthikKumarHiraskar- 请粘贴您的适配器和崩溃报告。您可以在此处复制粘贴您的 logcat 报告。 @KarthikKumarHiraskar- 请在此处添加您的适配器，因为我想看到您的过滤方法，并且由于您的适配器没有获得任何列表而发生 NullPointerException。所以也请添加您的适配器。 @RahulGupta，我正在使用标准的 SimpleAdaptor，我将在下面尝试您的解决方案并让您知道它是否有效.. 感谢您的回答建议。 & 不知道为什么有人对这个问题投了反对票.. 【参考方案1】：如果您搜索任何东西，您将使用 Textchange 侦听器，我们将使用两个数据列表，一个用于备份，另一个用于根据搜索重新填充。
edit_text.addTextChangedListener(new TextWatcher()
@Override
public void onTextChanged(CharSequence s, int start, int before, int count)
List<LocationSearchModel> textToCheckList=new ArrayList<>();
String textToCheck=s.toString();
if(s.length()!=0)
//code for making First letter of string CAPITAL
textToCheck = textToCheck.substring(0, 1).toUpperCase() + textToCheck.substring(1);
//code for filling second list from backup list based on text to search here in this case, it is "textToCheck"
for (LocationSearchModel searchModel: locationSearchList)
if(searchModel.getLocationName().startsWith(textToCheck))
textToCheckList.add(searchModel);
else
textToCheckList.addAll(locationSearchList) ;
// Setting new list to adapter and notifying it
locationSearchAdapter.setLocationSearchList(textToCheckList);
locationSearchAdapter.notifyDataSetChanged();
);
在上述情况下，“locationSearchList”是我的备份列表，我将使用它来填充我的第二个列表，即
List<LocationSearchModel> textToCheckList=new ArrayList<>();
在这种情况下。
我已经在上面的代码中提到了 cmets，按照它，你会找到解决方案。如果发现确实如此，请标记我的解决方案使用已满。
【讨论】：
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