如何在自定义 ListView 中按字母顺序排序
How to sort alphabetically in custom ListView
我需要在自定义 ListView 中按字母顺序排序。在 list_item 中，我有 TextImage 和两个 TextView（应用程序名称、程序包名称），但无法理解如何按字母表应用程序名称排序：
我的列表项：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal">
<ImageView
android:id="@+id/app_icon"
android:layout_width="56dp"
android:layout_height="56dp"
android:padding="4dp"
android:scaleType="centerCrop"
android:contentDescription="@null"
tools:src="@mipmap/ic_launcher" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center|center_vertical"
android:orientation="vertical"
android:paddingLeft="8dp">
<TextView
android:id="@+id/tv_app_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textStyle="bold"
tools:text="Application name"/>
<TextView
android:id="@+id/tv_app_package"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textStyle="bold"
tools:text="app.package.name"/>
</LinearLayout>
</LinearLayout>
我的适配器：
public class ListViewAdapter extends ArrayAdapter{
private Context context;
private List mItem;
private PackageManager packageManager;
public ListViewAdapter(Context context, int list_item, List items) {
super(context, R.layout.list_item, items);
this.context = context;
this.mItem = items;
packageManager = context.getPackageManager();
}
public int getCount(){
return ((null != mItem) ? mItem.size() : 0);
}
@Override
public ApplicationInfo getItem(int position) {
return (null != mItem) ? (ApplicationInfo) mItem.get(position) : null;
}
public long getItemId(int position){
return position;
}
public View getView(int position, View convertView, ViewGroup parent){
View view = convertView;
if (null == view) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_item, null);
}
ApplicationInfo data = (ApplicationInfo) mItem.get(position);
if (null != data){
TextView appName = (TextView) view.findViewById(R.id.tv_app_name);
TextView appPackage = (TextView) view.findViewById(R.id.tv_app_package);
ImageView icon = (ImageView) view.findViewById(R.id.app_icon);
appName.setText(data.loadLabel(packageManager));
appPackage.setText(data.packageName);
icon.setImageDrawable(data.loadIcon(packageManager));
}
return view;
}
}
我的片段显示ListView
public class ResultFragment extends ListFragment {
private PackageManager packageManager = null;
private ListViewAdapter listViewAdapter = null;
private List mItem;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
packageManager = getContext().getPackageManager();
new LoadApplications().execute();
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
ApplicationInfo applicationInfo = (ApplicationInfo) mItem.get(position);
try{
Intent intent = packageManager.getLaunchIntentForPackage(applicationInfo.packageName);
if (intent != null){
startActivity(intent);
}
}catch (ActivityNotFoundException e){
Toast.makeText(getActivity(), e.getMessage(), Toast.LENGTH_LONG).show();
}catch (Exception e){
Toast.makeText(getActivity(), e.getMessage(), Toast.LENGTH_LONG).show();
}
}
private List<ApplicationInfo> checkForLauncherIntent(List<ApplicationInfo> list){
ArrayList mItem = new ArrayList();
for(ApplicationInfo info : list) {
try{
if(packageManager.getLaunchIntentForPackage(info.packageName) != null) {
mItem.add(info);
}
} catch(Exception e) {
e.printStackTrace();
}
}
return mItem;
}
private class LoadApplications extends AsyncTask<Void, Void, Void>{
private ProgressDialog progressDialog = null;
@Override
protected Void doInBackground(Void... params){
mItem = checkForLauncherIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
listViewAdapter = new ListViewAdapter(getActivity(), R.layout.list_item, mItem);
return null;
}
@Override
protected void onPostExecute(Void result){
setListAdapter(listViewAdapter);
progressDialog.dismiss();
super.onPostExecute(result);
}
@Override
protected void onPreExecute(){
progressDialog = ProgressDialog.show(getActivity(), null, "Loading file info...");
super.onPreExecute();
}
}
}
请帮助我按字母顺序对列表进行排序。
先把中文改成拼音就可以用jar了pinyin4j-2.5.0.jar
那么也许你可以试试这个方法
Arrays.sort(arrayList,String.CASE_INSENSITIVE_ORDER);
来自 Android 文档
public abstract android.content.Intent
getLaunchIntentForPackage(java.lang.String packageName)
Returns a
"good" intent to launch a front-door activity in a package. This is
used, for example, to implement an "open" button when browsing through
packages. The current implementation looks first for a main activity
in the category Intent.CATEGORY_INFO, and next for a main activity in
the category Intent.CATEGORY_LAUNCHER. Returns null if neither are
found.
Parameters: packageName - The name of the package to inspect.
Returns: A fully-qualified Intent that can be used to launch the main
activity in the package. Returns null if the package does not contain
such an activity, or if packageName is not recognized.
您需要对代码进行一些更改
private ArrayList<ResolveInfo> checkForLauncherIntent(List<ApplicationInfo> list){
ArrayList<ResolveInfo> mItems = new ArrayList();
for(ApplicationInfo info : list) {
try{
if(packageManager.getLaunchIntentForPackage(info.packageName) != null) {
Intent intent = packageManager.getLaunchIntentForPackage(info.packageName));
ResolveInfo app = packageManager.resolveActivity(intent,0);
mItems.add(app);
}
} catch(Exception e) {
e.printStackTrace();
}
}
return mItems;
}
在你的 asn 任务中
private class LoadApplications extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params){
ArrayList<ResolveInfo> mItem = checkForLauncherIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
listViewAdapter = new ListViewAdapter(ctx, mItem);
return null;
}
@Override
protected void onPostExecute(Void result){
super.onPostExecute(result);
listView.setAdapter(listViewAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
ResolveInfo resolveInfo = listViewAdapter.getItem(position);
ActivityInfo activityInfo = resolveInfo.activityInfo;
ComponentName name = new ComponentName(activityInfo.applicationInfo.packageName,activityInfo.name);
Intent intent = new Intent();
intent.setComponent(name);
startActivity(intent);
}
});
}
@Override
protected void onPreExecute(){
super.onPreExecute();
//progressDialog = ProgressDialog.show(getActivity(), null, "Loading file info...");
}
}
在你的适配器构造函数中
public class ListViewAdapter extends BaseAdapter {
private Context context;
private ArrayList<ResolveInfo> mItem;
private PackageManager packageManager;
public ListViewAdapter(Context context, ArrayList<ResolveInfo> items) {
this.context = context;
this.mItem = items;
packageManager = context.getPackageManager();
Collections.sort(mItem,new ResolveInfo.DisplayNameComparator(packageManager));
}
public int getCount(){
return mItem.size();
}
@Override
public ResolveInfo getItem(int position) {
return mItem.get(position);
}
public long getItemId(int position){
return position;
}
public View getView(int position, View convertView, ViewGroup parent){
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.testa, null);
}
ResolveInfo app = mItem.get(position);
TextView appName = (TextView) convertView.findViewById(R.id.tv_app_name);
TextView appPackage = (TextView) convertView.findViewById(R.id.tv_app_package);
ImageView icon = (ImageView) convertView.findViewById(R.id.app_icon);
ActivityInfo activity = app.activityInfo;
appPackage.setText(activity.applicationInfo.packageName);
appName.setText(app.loadLabel(packageManager));
icon.setImageDrawable(app.loadIcon(packageManager));
return convertView;
}
}
查找整个项目At Github
这样做就可以了
像这样创建一个 class 比较器
public class CustomComparator implements Comparator<ApplicationInfo> {
@Override
public int compare(ApplicationInfo o1, ApplicationInfo o2) {
return o1.loadLabel(packageManager).toString().compareTo(o2.loadLabel(packageManager).toString());
}
}
现在在创建适配器的异步任务中使用此 class
Collections.sort(mItem, new CustomComparator());
listViewAdapter = new ListViewAdapter(context, mItem);
它将对您的列表进行排序
如果有更多问题请告诉我
需要在列表视图中排序时使用此方法，
Collections.sort(apps, new Comparator<App>() {
@Override
public int compare(App lhs, App rhs) {
//here getTitle() method return app name...
return lhs.getTitle().compareTo(rhs.getTitle());
}
});
请试试这个。
public class MainActivity extends AppCompatActivity {
private ArrayList<UserInfo> userInfos;
private CustomListAdapter customListAdapter;
private ListView customListView;
private String[] names={
"3 Khan",
"2 Ahmed",
"1 Iqbal"
};
private String[] professions={
"Rank 1",
"Rank 2",
"Rank 3"
};
private int[] photos={
R.drawable.sample_5,
R.drawable.sample_1,
R.drawable.sample_6
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setSupportActionBar((Toolbar)findViewById(R.id.toolbar));
customListView=(ListView)findViewById(R.id.custom_list_view);
userInfos=new ArrayList<>();
Arrays.sort(names,String.CASE_INSENSITIVE_ORDER);
customListAdapter=new CustomListAdapter(userInfos,this);
customListView.setAdapter(customListAdapter);
getDatas();
customListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(MainActivity.this, "Name : " + names[i] + "\n Profession : " + professions[i], Toast.LENGTH_SHORT).show();
}
});
}
// getting all the datas
private void getDatas(){
for(int count=0;count<names.length;count++){
userInfos.add(new UserInfo(names[count],professions[count],photos[count]));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.search_option,menu);
MenuItem menuItem=menu.findItem(R.id.search);
SearchView searchView=(SearchView)menuItem.getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return true;
}
@Override
public boolean onQueryTextChange(String newText) {
newText=newText.toString();
ArrayList<UserInfo> newUserInfos=new ArrayList<>();
for(UserInfo userInfo:userInfos){
String name=userInfo.getName().toLowerCase();
String profession=userInfo.getProfession().toLowerCase();
if(name.contains(newText) || profession.contains(newText)){
newUserInfos.add(userInfo);
}
}
customListAdapter.filterResult(newUserInfos);
customListAdapter.notifyDataSetChanged();
return false;
}
});
return super.onCreateOptionsMenu(menu);
}
}```
我需要在自定义 ListView 中按字母顺序排序。在 list_item 中，我有 TextImage 和两个 TextView（应用程序名称、程序包名称），但无法理解如何按字母表应用程序名称排序：
我的列表项：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal">
<ImageView
android:id="@+id/app_icon"
android:layout_width="56dp"
android:layout_height="56dp"
android:padding="4dp"
android:scaleType="centerCrop"
android:contentDescription="@null"
tools:src="@mipmap/ic_launcher" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center|center_vertical"
android:orientation="vertical"
android:paddingLeft="8dp">
<TextView
android:id="@+id/tv_app_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textStyle="bold"
tools:text="Application name"/>
<TextView
android:id="@+id/tv_app_package"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textStyle="bold"
tools:text="app.package.name"/>
</LinearLayout>
</LinearLayout>
我的适配器：
public class ListViewAdapter extends ArrayAdapter{
private Context context;
private List mItem;
private PackageManager packageManager;
public ListViewAdapter(Context context, int list_item, List items) {
super(context, R.layout.list_item, items);
this.context = context;
this.mItem = items;
packageManager = context.getPackageManager();
}
public int getCount(){
return ((null != mItem) ? mItem.size() : 0);
}
@Override
public ApplicationInfo getItem(int position) {
return (null != mItem) ? (ApplicationInfo) mItem.get(position) : null;
}
public long getItemId(int position){
return position;
}
public View getView(int position, View convertView, ViewGroup parent){
View view = convertView;
if (null == view) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_item, null);
}
ApplicationInfo data = (ApplicationInfo) mItem.get(position);
if (null != data){
TextView appName = (TextView) view.findViewById(R.id.tv_app_name);
TextView appPackage = (TextView) view.findViewById(R.id.tv_app_package);
ImageView icon = (ImageView) view.findViewById(R.id.app_icon);
appName.setText(data.loadLabel(packageManager));
appPackage.setText(data.packageName);
icon.setImageDrawable(data.loadIcon(packageManager));
}
return view;
}
}
我的片段显示ListView
public class ResultFragment extends ListFragment {
private PackageManager packageManager = null;
private ListViewAdapter listViewAdapter = null;
private List mItem;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
packageManager = getContext().getPackageManager();
new LoadApplications().execute();
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
ApplicationInfo applicationInfo = (ApplicationInfo) mItem.get(position);
try{
Intent intent = packageManager.getLaunchIntentForPackage(applicationInfo.packageName);
if (intent != null){
startActivity(intent);
}
}catch (ActivityNotFoundException e){
Toast.makeText(getActivity(), e.getMessage(), Toast.LENGTH_LONG).show();
}catch (Exception e){
Toast.makeText(getActivity(), e.getMessage(), Toast.LENGTH_LONG).show();
}
}
private List<ApplicationInfo> checkForLauncherIntent(List<ApplicationInfo> list){
ArrayList mItem = new ArrayList();
for(ApplicationInfo info : list) {
try{
if(packageManager.getLaunchIntentForPackage(info.packageName) != null) {
mItem.add(info);
}
} catch(Exception e) {
e.printStackTrace();
}
}
return mItem;
}
private class LoadApplications extends AsyncTask<Void, Void, Void>{
private ProgressDialog progressDialog = null;
@Override
protected Void doInBackground(Void... params){
mItem = checkForLauncherIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
listViewAdapter = new ListViewAdapter(getActivity(), R.layout.list_item, mItem);
return null;
}
@Override
protected void onPostExecute(Void result){
setListAdapter(listViewAdapter);
progressDialog.dismiss();
super.onPostExecute(result);
}
@Override
protected void onPreExecute(){
progressDialog = ProgressDialog.show(getActivity(), null, "Loading file info...");
super.onPreExecute();
}
}
}
请帮助我按字母顺序对列表进行排序。
先把中文改成拼音就可以用jar了pinyin4j-2.5.0.jar
那么也许你可以试试这个方法
Arrays.sort(arrayList,String.CASE_INSENSITIVE_ORDER);
来自 Android 文档
public abstract android.content.Intent getLaunchIntentForPackage(java.lang.String packageName)
Returns a "good" intent to launch a front-door activity in a package. This is used, for example, to implement an "open" button when browsing through packages. The current implementation looks first for a main activity in the category Intent.CATEGORY_INFO, and next for a main activity in the category Intent.CATEGORY_LAUNCHER. Returns null if neither are found.
Parameters: packageName - The name of the package to inspect.
Returns: A fully-qualified Intent that can be used to launch the main activity in the package. Returns null if the package does not contain such an activity, or if packageName is not recognized.
您需要对代码进行一些更改
private ArrayList<ResolveInfo> checkForLauncherIntent(List<ApplicationInfo> list){
ArrayList<ResolveInfo> mItems = new ArrayList();
for(ApplicationInfo info : list) {
try{
if(packageManager.getLaunchIntentForPackage(info.packageName) != null) {
Intent intent = packageManager.getLaunchIntentForPackage(info.packageName));
ResolveInfo app = packageManager.resolveActivity(intent,0);
mItems.add(app);
}
} catch(Exception e) {
e.printStackTrace();
}
}
return mItems;
}
在你的 asn 任务中
private class LoadApplications extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params){
ArrayList<ResolveInfo> mItem = checkForLauncherIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
listViewAdapter = new ListViewAdapter(ctx, mItem);
return null;
}
@Override
protected void onPostExecute(Void result){
super.onPostExecute(result);
listView.setAdapter(listViewAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
ResolveInfo resolveInfo = listViewAdapter.getItem(position);
ActivityInfo activityInfo = resolveInfo.activityInfo;
ComponentName name = new ComponentName(activityInfo.applicationInfo.packageName,activityInfo.name);
Intent intent = new Intent();
intent.setComponent(name);
startActivity(intent);
}
});
}
@Override
protected void onPreExecute(){
super.onPreExecute();
//progressDialog = ProgressDialog.show(getActivity(), null, "Loading file info...");
}
}
在你的适配器构造函数中
public class ListViewAdapter extends BaseAdapter {
private Context context;
private ArrayList<ResolveInfo> mItem;
private PackageManager packageManager;
public ListViewAdapter(Context context, ArrayList<ResolveInfo> items) {
this.context = context;
this.mItem = items;
packageManager = context.getPackageManager();
Collections.sort(mItem,new ResolveInfo.DisplayNameComparator(packageManager));
}
public int getCount(){
return mItem.size();
}
@Override
public ResolveInfo getItem(int position) {
return mItem.get(position);
}
public long getItemId(int position){
return position;
}
public View getView(int position, View convertView, ViewGroup parent){
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.testa, null);
}
ResolveInfo app = mItem.get(position);
TextView appName = (TextView) convertView.findViewById(R.id.tv_app_name);
TextView appPackage = (TextView) convertView.findViewById(R.id.tv_app_package);
ImageView icon = (ImageView) convertView.findViewById(R.id.app_icon);
ActivityInfo activity = app.activityInfo;
appPackage.setText(activity.applicationInfo.packageName);
appName.setText(app.loadLabel(packageManager));
icon.setImageDrawable(app.loadIcon(packageManager));
return convertView;
}
}
查找整个项目At Github
这样做就可以了
像这样创建一个 class 比较器
public class CustomComparator implements Comparator<ApplicationInfo> {
@Override
public int compare(ApplicationInfo o1, ApplicationInfo o2) {
return o1.loadLabel(packageManager).toString().compareTo(o2.loadLabel(packageManager).toString());
}
}
现在在创建适配器的异步任务中使用此 class
Collections.sort(mItem, new CustomComparator());
listViewAdapter = new ListViewAdapter(context, mItem);
它将对您的列表进行排序
如果有更多问题请告诉我
需要在列表视图中排序时使用此方法，
Collections.sort(apps, new Comparator<App>() {
@Override
public int compare(App lhs, App rhs) {
//here getTitle() method return app name...
return lhs.getTitle().compareTo(rhs.getTitle());
}
});
请试试这个。
public class MainActivity extends AppCompatActivity {
private ArrayList<UserInfo> userInfos;
private CustomListAdapter customListAdapter;
private ListView customListView;
private String[] names={
"3 Khan",
"2 Ahmed",
"1 Iqbal"
};
private String[] professions={
"Rank 1",
"Rank 2",
"Rank 3"
};
private int[] photos={
R.drawable.sample_5,
R.drawable.sample_1,
R.drawable.sample_6
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setSupportActionBar((Toolbar)findViewById(R.id.toolbar));
customListView=(ListView)findViewById(R.id.custom_list_view);
userInfos=new ArrayList<>();
Arrays.sort(names,String.CASE_INSENSITIVE_ORDER);
customListAdapter=new CustomListAdapter(userInfos,this);
customListView.setAdapter(customListAdapter);
getDatas();
customListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(MainActivity.this, "Name : " + names[i] + "\n Profession : " + professions[i], Toast.LENGTH_SHORT).show();
}
});
}
// getting all the datas
private void getDatas(){
for(int count=0;count<names.length;count++){
userInfos.add(new UserInfo(names[count],professions[count],photos[count]));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.search_option,menu);
MenuItem menuItem=menu.findItem(R.id.search);
SearchView searchView=(SearchView)menuItem.getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return true;
}
@Override
public boolean onQueryTextChange(String newText) {
newText=newText.toString();
ArrayList<UserInfo> newUserInfos=new ArrayList<>();
for(UserInfo userInfo:userInfos){
String name=userInfo.getName().toLowerCase();
String profession=userInfo.getProfession().toLowerCase();
if(name.contains(newText) || profession.contains(newText)){
newUserInfos.add(userInfo);
}
}
customListAdapter.filterResult(newUserInfos);
customListAdapter.notifyDataSetChanged();
return false;
}
});
return super.onCreateOptionsMenu(menu);
}
}```