我看到这篇与我的问题有关的帖子。 link
我读完了问题和答案，我尝试了所有这些但是没有一个能为我工作。 所以最后我尝试进行一些日志聊天，看看问题的哪一部分。
这是我的menu_search.xml：
<menu
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:title="Search"
android:id="@+id/action_search"
android:icon="@drawable/magnifier24"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="always|collapseActionView"/>
</menu>
这是我的MainActivity.java：
public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener {
private static final String LogTAG = MainActivity.class.getSimpleName();
String [] cNames = {
"Error - 128",
"Upload - 128",
"Loading - 128",
"Warning - 128",
"Checked - 128",
"Magnifier - 24",
"Heart - 32",
"Save - 16",
"Save - 64"
};
int[] cIcon = {
R.drawable.error128,
R.drawable.upload128,
R.drawable.loading128,
R.drawable.warning128,
R.drawable.checked128,
R.drawable.magnifier24,
R.drawable.heart32,
R.drawable.heart64,
R.drawable.save16
};
Toolbar toolbar;
RecyclerView recyclerView;
RecyclerAdapter recyclerAdapter;
RecyclerView.LayoutManager layoutManager;
ArrayList<Icon> arrayList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.srchTool);
setSupportActionBar(toolbar);
recyclerView = (RecyclerView) findViewById(R.id.rvIcon);
layoutManager = new GridLayoutManager(MainActivity.this, 3);
//layoutManager = new LinearLayoutManager(this);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(layoutManager);
int count = 0;
for(String name : cNames){
arrayList.add(new Icon(name, cIcon[count]));
count++;
}
RecyclerAdapter myAdapter = new RecyclerAdapter(arrayList);
recyclerView.setAdapter(myAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_search,menu);
MenuItem menuItem = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(menuItem);
searchView.setOnQueryTextListener(this);
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
Log.e(LogTAG, "newText : " + newText);
if (!newText.isEmpty()){
Log.e(LogTAG, "newText 1 : " + newText);
newText = newText.toLowerCase();
Log.e(LogTAG, "newText 2 : " + newText);
ArrayList<Icon> newList = new ArrayList<>();
Log.e(LogTAG, "newText 3 : " + newText);
for (Icon icon : arrayList){
Log.e(LogTAG, "newText 4 : " + icon.getName().toLowerCase());
String name = icon.getName().toLowerCase();
Log.e(LogTAG, "newText 5 : " + icon.getName().toLowerCase());
if(name.contains(newText)) {
Log.e(LogTAG, "newText 6 : " + icon.getName().toLowerCase());
newList.add(icon);
Log.e(LogTAG, "newText 7 : " + icon.getName().toLowerCase());
}
}
Log.e(LogTAG, "newText 8 : " + newText);
recyclerAdapter.setFilter(newList);
Log.e(LogTAG, "newText 9 : " + newText);
return true;
} else {
Log.e(LogTAG, "newText 999 : " + newText);
return true;
}
}
}
这是RecyclerAdapter.java：
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder>{
private static final String LogTAG = MainActivity.class.getSimpleName();
ArrayList<Icon> arrayList = new ArrayList<>();
RecyclerAdapter(ArrayList<Icon> arrayList){
this.arrayList = arrayList;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_layout,parent,false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.c_Name.setText(arrayList.get(position).getName());
holder.c_Icon.setImageResource(arrayList.get(position).getIcon());
}
@Override
public int getItemCount() {
return arrayList.size();
}
public static class MyViewHolder extends RecyclerView.ViewHolder{
ImageView c_Icon;
TextView c_Name;
public MyViewHolder(View itemView) {
super(itemView);
c_Icon = (ImageView) itemView.findViewById(R.id.imageView);
c_Name = (TextView) itemView.findViewById(R.id.textView);
}
}
public void setFilter(ArrayList<Icon> newList){
Log.e(LogTAG, "newText 8.1");
arrayList = new ArrayList<>();
Log.e(LogTAG, "newText 8.2");
arrayList.addAll(newList );
Log.e(LogTAG, "newText 8.3");
notifyDataSetChanged();
}
}
这是我的搜索toolbar.xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="@style/ThemeOverlay.AppCompat.Dark"
app:actionViewClass="android.support.v7.widget.SearchView"
android:id="@+id/srchTool">
</android.support.v7.widget.Toolbar>
这是格斗：
apply plugin: 'com.android.application'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.afe.maja.searchview"
minSdkVersion 16
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
implementation 'com.android.support:recyclerview-v7:27.0.1'
implementation 'com.android.support:cardview-v7:27.0.1'
implementation 'com.android.support:design:27.0.1'
implementation 'com.android.support:appcompat-v7:27.0.1'
}
LogCat停在 E / MainActivity：newText 8：a 所以我猜问题出在 recyclerAdapter.setFilter（newList）;
我是Android编程的新手，所以我会感激任何建议。
编辑了，我忘了包含RecyclerAdapter.java
更新
我收到类似这样的错误消息：
11-30 13:56:25.274 12928-12928/com.afe.maja.searchview E/MainActivity: newText 8 : a
11-30 13:56:25.275 12928-12928/com.afe.maja.searchview E/InputEventSender: Exception dispatching finished signal.
11-30 13:56:25.275 12928-12928/com.afe.maja.searchview E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
11-30 13:56:25.276 12928-12928/com.afe.maja.searchview E/MessageQueue-JNI: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.afe.maja.searchview.RecyclerAdapter.setFilter(java.util.ArrayList)' on a null object reference
at com.afe.maja.searchview.MainActivity.onQueryTextChange(MainActivity.java:119)
at android.support.v7.widget.SearchView.onTextChanged(SearchView.java:1180)
at android.support.v7.widget.SearchView$10.onTextChanged(SearchView.java:1714)
at android.widget.TextView.sendOnTextChanged(TextView.java:8187)
at android.widget.TextView.handleTextChanged(TextView.java:8249)
at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:10371)
at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:1208)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:578)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:509)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:508)
at android.text.method.QwertyKeyListener.onKeyDown(QwertyKeyListener.java:223)
at android.text.method.TextKeyListener.onKeyDown(TextKeyListener.java:136)
at android.widget.TextView.doKeyDown(TextView.java:6285)
at android.widget.TextView.onKeyDown(TextView.java:6075)
at android.widget.AutoCompleteTextView.onKeyDown(AutoCompleteTextView.java:829)
at android.view.KeyEvent.dispatch(KeyEvent.java:2688)
at android.view.View.dispatchKeyEvent(View.java:9960)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1630)
at com.android.internal.policy.DecorView.superDispatchKeyEvent(DecorView.java:405)
at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1798)
at android.app.Activity.dispatchKeyEvent(Activity.java:3021)
at android.support.v7.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:534)
at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:58)
at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.dispatchKeyEvent(AppCompatDelegateImplBase.java:316)
at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:58)
at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:319)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4331)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4302)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3853)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3906)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3872)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3999)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3880)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4056)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3853)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3906)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3872)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3880)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3853)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3906)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3872)
at android.view.ViewRootImpl$A
答案 0 :(得分：1)
更改此
RecyclerAdapter myAdapter = new RecyclerAdapter(arrayList);
到
recyclerAdapter = new RecyclerAdapter(arrayList);
答案 1 :(得分：0)
将您的setFilter更改为
public void setFilter(ArrayList<Icon> newList){
Log.e(LogTAG, "newText 8.1");
if(arrayList != null){
arrayList.clear();
}
Log.e(LogTAG, "newText 8.2");
arrayList.addAll(newList );
Log.e(LogTAG, "newText 8.3");
notifyDataSetChanged();
}