Java 搜索视图空引用_Java_Android_Xml

Java 搜索视图空引用

java android xml

Java 搜索视图空引用,java,android,xml,Java,Android,Xml,我看到了这篇与我的问题有关的帖子。我通读了所有的问题和答案，我都试过了，但没有一个对我有用。所以最后我试着写一些日志聊天，看看问题出在哪一部分这是我的菜单_search.xml： <menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto"> <item android:title="Sear

我看到了这篇与我的问题有关的帖子。

我通读了所有的问题和答案，我都试过了，但没有一个对我有用。所以最后我试着写一些日志聊天，看看问题出在哪一部分

这是我的菜单_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>

LogCat在E/main停止活动：新文本8:a 所以我猜问题出在recyclerAdapter.setFilter（newList）中
我是android编程新手，所以如果有任何建议，我将不胜感激
编辑后，我忘了包括RecyclerAdapter.java
以下更新
我收到如下错误消息：

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

将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(); }

public void setFilter（ArrayList newList）{ Log.e（LogTAG，“新文本8.1”）； if（arrayList！=null）{ arrayList.clear（）； } Log.e（LogTAG，“新文本8.2”）； arrayList.addAll（newList）； Log.e（LogTAG，“新文本8.3”）； notifyDataSetChanged（）； }
更改此选项

RecyclerAdapter myAdapter = new RecyclerAdapter(arrayList);
到

那有什么问题？是抛出异常还是在searchview上键入时什么都没有发生我尝试了，但仍然没有成功。。发生了相同的错误。甚至达不到
Log.e（LogTAG，“newText 8.1”）看看我的另一个答案。你没有初始化你的RecyclerAdapter哦，对了！！谢谢问题解决了。一个位问题，它无法返回到原始数组，经过一点逻辑后，它工作正常。谢谢你，贝克！ 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' } 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 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(); } RecyclerAdapter myAdapter = new RecyclerAdapter(arrayList); recyclerAdapter = new RecyclerAdapter(arrayList);