过滤自定义baseadapter中的应用程序列表
我正在尝试使用我的baseadapter类为我的已安装应用的列表视图实现searchview。
目前它看起来像这样：
问题在于，当我用
命中它时崩溃了09-02 19:56:47.925 1628-1628/com.spicycurryman.getdisciplined10.app.dev E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.spicycurryman.getdisciplined10.app.dev, PID: 1628
java.lang.NullPointerException
at com.spicycurryman.getdisciplined10.app.BlockActivity$2.onQueryTextSubmit(BlockActivity.java:126)
因为我不确定如何设置我的listview和适配器
目前这是我的片段类：
package com.spicycurryman.getdisciplined10.app;
import android.annotation.TargetApi;
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.app.SearchManager;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.SearchView;
import android.text.Spannable;
import android.text.SpannableString;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.ibc.android.demo.appslist.app.ApkAdapter;
import info.androidhive.tabsswipe.adapter.TabsPagerAdapter;
/**
* Created by Spicycurryman on 6/17/14.
*/
public class BlockActivity extends ActionBarActivity implements
ActionBar.TabListener, SearchView.OnQueryTextListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
ApkAdapter mAppAdapter;
private ListView mListView;
private ArrayAdapter<String> hanadapter;
SearchManager searchManager;
SearchView searchView;
// Tab titles
private String[] tabs = {"Installed Apps"};
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
@Override
protected void onCreate(Bundle savedInstanceState) {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
super.onCreate(savedInstanceState);
setTheme(R.style.Theme_Light_appalled);
SpannableString s = new SpannableString("GetDisciplined");
s.setSpan(new TypefaceSpan(this, "roboto-lightitalic.ttf.ttf"), 0, s.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// Update the action bar title with the TypefaceSpan instance
ActionBar actionBar = getActionBar();
actionBar.setTitle(s);
setContentView(R.layout.block_apps);
// Initilization
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Adding Tabs
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on swiping the viewpager make respective tab selected
* */
final ActionBar finalActionBar = actionBar;
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
finalActionBar.setSelectedNavigationItem(position);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.block, menu);
searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
if (!isLoading()) {
mAppAdapter.getFilter().filter(query);
}
return true;
}
private boolean isLoading() {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
if (!isLoading()) {
if (newText.contains(newText)) {
mAppAdapter.getFilter().filter(newText);
}
}
return true;
}
});
return false;
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case android.R.id.home:
onBackPressed();
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
@Override
public boolean onQueryTextSubmit(String s) {
return false;
}
@Override
public boolean onQueryTextChange(String s) {
return false;
}
}
这是我的BaseAdapter类注意底部：
package com.ibc.android.demo.appslist.app;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.Filterable;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.Filter;
import com.spicycurryman.getdisciplined10.app.R;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
//
public class ApkAdapter extends BaseAdapter implements Filterable {
//Pastebin link: http://pastebin.com/LGRicg4U , http://pastebin.com/c4WfmhMK , http://pastebin.com/gFuuM4dY, http://pastebin.com/4Q7EP9G4
// http://pastebin.com/Te2g072w, http://pastebin.com/NLT5iUiA ,
SharedPreferences sharedPrefs;
SharedPreferences sharedPrefsapp;
List<PackageInfo> packageList;
TextView appnamestyle;
Activity context;
PackageManager packageManager;
boolean[] itemChecked;
HashSet checked;
Filter mFilter;
String PACKAGE_NAME;
TextView appname;
public ApkAdapter(Activity context, List<PackageInfo> packageList,
PackageManager packageManager) {
super();
this.context = context;
this.packageList = packageList;
this.packageManager = packageManager;
itemChecked = new boolean[packageList.size()];
}
private class ViewHolder {
TextView apkName;
CheckBox ck1;
TextView packageName;
}
public int getCount() {
return packageList.size();
}
public Object getItem(int position) {
return packageList.get(position);
}
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.installed_apps, null);
holder = new ViewHolder();
holder.apkName = (TextView) convertView
.findViewById(R.id.appname);
holder.apkName.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/raleway-medium.otf"));
holder.ck1= (CheckBox)convertView
.findViewById(R.id.checkBox1);
holder.packageName = (TextView) convertView.findViewById(R.id.app_package);
convertView.setTag(holder);
//holder.ck1.setTag(packageList.get(position));
} else {
holder = (ViewHolder) convertView.getTag();
}
// ViewHolder holder = (ViewHolder) convertView.getTag();
final PackageInfo packageInfo = (PackageInfo) getItem(position);
Drawable appIcon = packageManager
.getApplicationIcon(packageInfo.applicationInfo);
// Make sure to define it again!
PACKAGE_NAME = packageInfo.packageName;
final String appName = packageManager.getApplicationLabel(
packageInfo.applicationInfo).toString();
appIcon.setBounds(0, 0, 80, 80);
holder.apkName.setCompoundDrawables(appIcon, null, null, null);
holder.apkName.setCompoundDrawablePadding(15);
holder.apkName.setText(appName);
//holder.packageName.setText(PACKAGE_NAME);
holder.ck1.setChecked(false);
if (itemChecked[position])
holder.ck1.setChecked(true);
else
holder.ck1.setChecked(false);
// CHANGE UP EVERYTHING! MAKE THIS SHIT WORK, TIGGA!
checked = new HashSet();
PACKAGE_NAME = packageInfo.packageName;
//Log.d("just here: ", PACKAGE_NAME);
sharedPrefs = context.getSharedPreferences(context.getApplicationContext().getPackageName(), Context.MODE_PRIVATE);
sharedPrefsapp = context.getSharedPreferences("appdb", Context.MODE_PRIVATE);
holder.ck1.setChecked(sharedPrefs.getBoolean(PACKAGE_NAME,false));
holder.ck1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences.Editor editor = context.getSharedPreferences(context.getApplicationContext().getPackageName(), Context.MODE_PRIVATE).edit();
SharedPreferences.Editor editorapp = context.getSharedPreferences("appdb", Context.MODE_PRIVATE).edit();
if (holder.ck1.isChecked()) {
itemChecked[position] = true;
holder.ck1.setChecked(true);
editor.putBoolean(packageInfo.packageName, true);
editorapp.putString(packageInfo.packageName, packageInfo.packageName);
editor.apply();
editorapp.apply();
// sharedPrefs = context.getSharedPreferences(context.getApplicationContext().getPackageName(), Context.MODE_PRIVATE);
} else {
itemChecked[position] = false;
holder.ck1.setChecked(false);
editor.putBoolean(packageInfo.packageName, false);
editorapp.remove(packageInfo.packageName);
editor.apply();
editorapp.apply();
//sharedPrefs = context.getSharedPreferences(context.getApplicationContext().getPackageName(), Context.MODE_PRIVATE);
}
}
});
return convertView;
}
@Override
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ItemsFilter();
}
return mFilter;
}
private class ItemsFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence prefix) {
// TODO Auto-generated method stub
List<PackageInfo> packageList_2 = packageList;
String prefixString = prefix.toString().toLowerCase();
FilterResults results = new FilterResults();
ArrayList<PackageInfo> FilteredList = new ArrayList<PackageInfo>();
if (prefix == null || prefix.length() == 0) {
results.values = packageList_2;
results.count = packageList_2.size();
return results;
}
for (int i = 0; i < packageList_2.size(); i++) {
String filterText = prefix.toString().toLowerCase();
try {
PackageInfo data = packageList_2.get(i);
if (data.applicationInfo
.loadLabel(context.getApplicationContext().getPackageManager())
.toString().toLowerCase().contains(filterText)) {
FilteredList.add(data);
} else if (data.packageName.contains(filterText)) {
FilteredList.add(data);
}
} catch (Exception e) {
Toast.makeText(context.getApplicationContext(),
"exception e" + e.toString(),
Toast.LENGTH_SHORT).show();
}
}
results.values = FilteredList;
results.count = FilteredList.size();
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
Toast.makeText(context.getApplicationContext(),"result-0 "+results.count,
Toast.LENGTH_SHORT).show();
packageList = (List<PackageInfo>) results.values;
notifyDataSetChanged();
}
}
}
如何设置mAppAdapter以使其过滤结果？已经做了很多研究，但无法为我的案例提供解决方案。
编辑：
出现此错误：
Process: com.spicycurryman.getdisciplined10.app.dev, PID: 1317
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.spicycurryman.getdisciplined10.app.dev/com.spicycurryman.getdisciplined10.app.InstalledAppActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
这是我的新代码：
这是我的edittext，它表示它为null：
<?xml version="1.0" encoding="utf-8"?>
<EditText xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layoutsearch"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:cursorVisible="true"
android:hint="@string/hint"
android:imeOptions="actionDone"
android:inputType="text"
android:textColor="@android:color/white"
android:textCursorDrawable="@android:color/white" />
当它明显存在时，不确定为什么会产生此错误。
1 个答案:
答案 0 :(得分：2)
-
编辑：我开发了一个组件，它允许您过滤自定义ListView并动态更改过滤器等。我认为它有一个简单的实现和你。试一试！我希望这对你们所有人来说都会更好。
https://github.com/matessoftwaresolutions/AndroidFilterableList
-
对我来说最简单的方法：
- 定义自定义通用过滤器
- 定义使其成为通用所需的侦听器
- 将所有项目链接到视图
- 我的扩展baseAdapter实现了两个接口 （IFilteredItem和IFilteredListListener。
示例：
其内容是：
public class MenuListAdapter extends BaseAdapter implements IFilteredListListener<PointOfInterest>, IFilterableItem<PointOfInterest> {
public MenuListAdapter(Context context,List<PointsOfInterest> points) {
this.context = context;
//Elements for the list
this.points = points;
}
....
BaseAdapter方法和其他实现：
@Override
public int getCount() {
return points.size();
}
@Override
public Object getItem(int position) {
return points.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public Filter getFilter() {
if (filter == null) {
filter = new ListFilter<PointOfInterest>(points, this, this,this);
}
return filter;
}
@Override
public void onSearchResult(List<PointOfInterest> objects) {
if (objects.size() == 0) {
points = objects;
objects.add(mockedPointForEmptyList);
} else {
points = objects;
}
}
@Override
public String getStringForFilter(PointOfInterest item) {
return item.getTitle();
}
....
在我的活动中，我有一个列表视图。我设置了自定义适配器，它会根据兴趣点的标题比较过滤器：
在您的活动中，获取将用于过滤列表的编辑文本，并添加观察者：
filterText = (EditText) customActionBar.findViewById(R.id.searchText);
filterText.addTextChangedListener(filterTextWatcher);
在您的活动（属性区域）中，定义您的观察者：
private TextWatcher filterTextWatcher = new TextWatcher() {
public void afterTextChanged(Editable s) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
yourMenuAdapter.getFilter().filter(s);
}
};
我建议您使用我自己的过滤器实现（复制和粘贴，如果您发现任何错误，请告诉我们！）：
public class ListFilter<T> extends Filter {
private List<T> adapterFilterElements;
private List<T> originalFilterElements;
private final Object mLock = new Object();
private List<String> originalFilterValues;
private IFilteredListListener<T> listener;
private BaseAdapter baseAdapter;
private IFilterableItem<T> filterableItem;
public ListFilter(List<T> originalElements, BaseAdapter baseAdapter, IFilteredListListener<T> listener, IFilterableItem<T> filterableItem) {
this.adapterFilterElements = originalElements;
this.originalFilterElements = originalElements;
this.baseAdapter = baseAdapter;
this.listener = listener;
this.filterableItem = filterableItem;
}
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
if (originalFilterValues == null) {
synchronized (mLock) {
originalFilterValues = fillListNamesFromItems(adapterFilterElements);
}
}
if (prefix == null || prefix.length() == 0) {
ArrayList<String> list;
synchronized (mLock) {
list = new ArrayList<String>(originalFilterValues);
}
results.values = list;
results.count = list.size();
} else {
String prefixString = prefix.toString().toLowerCase(Locale.UK);
ArrayList<String> values;
synchronized (mLock) {
values = new ArrayList<String>(originalFilterValues);
}
final int count = values.size();
final ArrayList<String> newValues = new ArrayList<String>();
for (int i = 0; i < count; i++) {
final String value = values.get(i);
final String valueText = value.toString().toLowerCase(Locale.UK);
// First match against the whole, non-splitted value
if (valueText.startsWith(prefixString)) {
newValues.add(value);
} else {
final String[] words = valueText.split(" ");
final int wordCount = words.length;
// Start at index 0, in case valueText starts with
// space(s)
for (int k = 0; k < wordCount; k++) {
if (words[k].startsWith(prefixString)) {
newValues.add(value);
break;
}
}
}
}
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
results.values = fillItemListFromNames((List<String>) results.values);
listener.onSearchResult((List<T>) results.values);
adapterFilterElements = (List<T>) results.values;
if (results.count > 0) {
baseAdapter.notifyDataSetChanged();
} else {
baseAdapter.notifyDataSetInvalidated();
}
}
private List<T> fillItemListFromNames(List<String> names) {
List<T> ret = new ArrayList<T>();
if (names != null) {
for (String s : names) {
for (T p : originalFilterElements) {
if (filterableItem.getStringForFilter(p).equals(s)) {
ret.add(p);
break;
}
}
}
}
return ret;
}
private List<String> fillListNamesFromItems(List<T> items) {
List<String> ret = new ArrayList<String>();
if (items != null) {
for (T item : items) {
ret.add(filterableItem.getStringForFilter(item));
}
}
return ret;
}
}
构造函数接收基本适配器和这些自定义接口的两个实现：
public interface IFilteredListListener<T> extends Filterable {
public void onSearchResult(List<T> objects);
}
和
public interface IFilterableItem<T> {
public String getStringForFilter(T item);
}
希望这个具体的例子有所帮助!!
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