如何解决如何在菜单中实现搜索过滤器请帮助我
到目前为止，我已经学习了一些教程，并且已将 SearchView 添加到 ActionBar，但我不确定从哪里开始。我看过一些例子，但当你开始输入时，它们都没有显示结果。
这是我的 MainActivity.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/app_list"/>
</androidx.constraintlayout.widget.ConstraintLayout>
这是我的 App_row.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardUseCompatPadding="true"
app:cardCornerRadius="3dp"
android:id="@+id/app_row">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/selectableItemBackground"
android:padding="8dp">
<ImageView
android:layout_width="40dp"
android:layout_height="wrap_content"
android:id="@+id/app_icon"
android:contentDescription="Application Icon"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginRight="16dp"
android:layout_marginEnd="16dp"
android:adjustViewBounds="true"
android:layout_centerInParent="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/app_name"
android:layout_toRightOf="@+id/app_icon"
android:layout_toEndOf="@+id/app_icon"
android:layout_alignParentTop="true"
android:textSize="15sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/apk_size"
android:layout_toRightOf="@+id/app_icon"
android:layout_toEndOf="@+id/app_icon"
android:layout_below="@+id/app_name"/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
这是我的主要活动.Java
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.MenuItemCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.SearchView;
import java.io.File;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
public class MainActivity extends AppCompatActivity {
List<App> apps = new ArrayList<>();
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.app_list);
PackageManager pm = getApplicationContext().getPackageManager();
List<ApplicationInfo> packages = pm.getInstalledApplications(PackageManager.GET_META_DATA);
for (ApplicationInfo packageInfo: packages){
String name;
if ((name = String.valueOf(pm.getApplicationLabel(packageInfo))).isEmpty()){
name = packageInfo.packageName;
}
Drawable icon = pm.getApplicationIcon(packageInfo);
String apkPath = packageInfo.sourceDir;
long apkSize = new File(packageInfo.sourceDir).length();
apps.add(new App(name,icon,apkPath,apkSize));
}
Collections.sort(apps,new Comparator<App>() {
@Override
public int compare(App app,App t1) {
return app.getName().toLowerCase().compareTo(t1.getName().toLowerCase());
}
}
);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setHasFixedSize(true);
AppAdapter appAdapter = new AppAdapter(this,apps);
recyclerView.setAdapter(appAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu,menu);
MenuItem menuItem = menu.findItem(R.id.search_view);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(menuItem);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
AppAdapter appAdapter getFilesDir().Filter
return false;
}
});
}
}
这是我的应用程序。Java
import android.graphics.drawable.Drawable;
public class App {
private String name;
private Drawable icon;
private String apkPath;
private long apkSize;
public App(String name,Drawable icon,String apkPath,long apkSize) {
this.name = name;
this.icon = icon;
this.apkPath = apkPath;
this.apkSize = apkSize;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Drawable getIcon() {
return icon;
}
public void setIcon(Drawable icon) {
this.icon = icon;
}
public String getApkPath() {
return apkPath;
}
public void setApkPath(String apkPath) {
this.apkPath = apkPath;
}
public long getApkSize() {
return apkSize;
}
public void setApkSize(long apkSize) {
this.apkSize = apkSize;
}
}
This is my App_Adapter.Java
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.cardview.widget.CardView;
import androidx.core.content.FileProvider;
import androidx.recyclerview.widget.RecyclerView;
import java.io.File;
import java.util.List;
public class AppAdapter extends RecyclerView.Adapter<AppAdapter.AppViewHolder> {
Context context;
List<App> apps;
public AppAdapter(Context context,List<App> apps) {
this.context = context;
this.apps = apps;
}
@NonNull
@Override
public AppViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.app_row,parent,false);
return new AppViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull AppViewHolder holder,int position) {
holder.appName.setText(apps.get(position).getName());
long apkSize = apps.get(position).getApkSize();
holder.apkSize.setText(getHumanReadableSize(apkSize));
holder.appIcon.setImageDrawable(apps.get(position).getIcon());
holder.cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent shareAPKIntent = new Intent();
shareAPKIntent.setAction(Intent.ACTION_SEND);
shareAPKIntent.putExtra(Intent.EXTRA_STREAM,FileProvider.getUriForFile(
context,BuildConfig.APPLICATION_ID + ".provider",new File(apps.get(position).getApkPath())
));
shareAPKIntent.addFlags(Intent.FLAG_GRANT_PREFIX_URI_PERMISSION);
shareAPKIntent.setType("application/vnd.android.package-archive");
context.startActivity(Intent.createChooser(shareAPKIntent,"Share APK"));
}
});
}
private String getHumanReadableSize(long apkSize) {
String humanReadableSize;
if (apkSize<1024){
humanReadableSize = String.format(
context.getString(R.string.app_size_b),(double) apkSize
);
} else if (apkSize< Math.pow(1024,2)) {
humanReadableSize = String.format(
context.getString(R.string.app_size_kb),(double) (apkSize/1024)
);
} else if (apkSize< Math.pow(1024,3)) {
humanReadableSize = String.format(
context.getString(R.string.app_size_mb),(double) (apkSize/Math.pow(1024,2))
);
} else {
humanReadableSize = String.format(
context.getString(R.string.app_size_gb),3))
);
}
return humanReadableSize;
}
@Override
public int getItemCount() {
return apps.size();
}
@Override
public void onAttachedToRecyclerView(@NonNull RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
public static class AppViewHolder extends RecyclerView.ViewHolder{
CardView cardView;
ImageView appIcon;
TextView appName,apkSize;
public AppViewHolder(@NonNull View itemView) {
super(itemView);
cardView = itemView.findViewById(R.id.app_row);
appIcon = itemView.findViewById(R.id.app_icon);
appName = itemView.findViewById(R.id.app_name);
apkSize = itemView.findViewById(R.id.apk_size);
}
}
}
这是我的 Menu.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/search_view"
android:title="search"
app:showAsAction="always"
android:icon="@drawable/ic_baseline_search_24"
app:actionViewClass="android.widget.SearchView"/>
</menu>
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