通知数据集更改() 方法不起作用 棉花糖上的回收器视图

Question

我的应用程序在Android 6上崩溃，
我正在使用带有自定义适配器的改造RecyclerView当我调用notifydatasetchanged()时：方法不起作用RecyclerView

这是我的适配器类

答案适配器.java

public class AnswersAdapter extends RecyclerView.Adapter<AnswersAdapter.ViewHolder> {
private List<Item> mItems;
private Context mContext;
private PostItemListener mItemListener;

public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView titleTv;
PostItemListener mItemListener;
public ViewHolder(View itemView, PostItemListener postItemListener) {
super(itemView);
titleTv =  itemView.findViewById(android.R.id.text1);
this.mItemListener = postItemListener;
itemView.setOnClickListener(this);
}
@Override
public void onClick(View view) {
Item item = getItem(getAdapterPosition());
this.mItemListener.onPostClick(item.getAnswerId());
notifyDataSetChanged();
}
}
public AnswersAdapter(Context context, List<Item> posts, PostItemListener itemListener) {
mItems = posts;
mContext = context;
mItemListener = itemListener;
}
@Override
public AnswersAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View postView = inflater.inflate(android.R.layout.simple_list_item_1, parent, false);
ViewHolder viewHolder = new ViewHolder(postView, this.mItemListener);
return viewHolder;
}
@Override
public void onBindViewHolder(AnswersAdapter.ViewHolder holder, int position) {
Item item = mItems.get(position);
TextView textView = holder.titleTv;
textView.setText(item.getOwner().getDisplayName());
}
@Override
public int getItemCount() {
return mItems.size();
}
public void updateAnswers(List<Item> items) {
mItems.clear();
mItems.addAll(items);
this.notifyDataSetChanged();
}
private Item getItem(int adapterPosition) {
return mItems.get(adapterPosition);
}
public interface PostItemListener {
void onPostClick(long id);
}
}

这是我的主要活动主要活动.java

public class MainActivity extends AppCompatActivity {
private AnswersAdapter mAdapter;
private SOService mService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mService = ApiUtils.getSOService();
RecyclerView mRecyclerView =  findViewById(R.id.rvawnser);
mAdapter = new AnswersAdapter(this, new ArrayList<Item>(0),
new AnswersAdapter.PostItemListener() {
@Override
public void onPostClick(long id) {
Toast.makeText(MainActivity.this, "Post id is" + id, Toast.LENGTH_SHORT).show();
}
});
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(layoutManager);
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setHasFixedSize(true);
RecyclerView.ItemDecoration itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
mRecyclerView.addItemDecoration(itemDecoration);
loadAnswers();
}
public void loadAnswers() {
mService.getAnswers().subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<SOAnswersResponse>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(SOAnswersResponse soAnswersResponse) {
mAdapter.updateAnswers(soAnswersResponse.getItems());
}
});
}
private void showErrorMessage() {
Toast.makeText(getApplicationContext(), "MainActivity: error loading from API", Toast.LENGTH_LONG).show();
}

当我删除时它工作正常

mAdapter.updateAnswers(soAnswersResponse.getItems());

这是错误日志

12-25 07：34：49.535 17676-17676/com.example.masoudmk.myapplication E/Android运行时：致命异常：main 进程： com.example.masoudmk.myapplication， PID： 17676 java.lang.NoSuchMethodError： no static Method getFont(Landroid/content/Context;ILandroid/util/TypedValue;ILandroid/widget/TextView;)安卓/图形/字体; 在类 Landroid/support/v4/content/res/ResourcesCompat;或其超级 类(声明 'android.support.v4.content.res.ResourcesCompat' 出现在/data/app/com.example.masoudmk.myapplication-1/split_lib_dependencies_apk.apk) 在 android.support.v7.widget.TintTypedArray.getFont(TintTypedArray.java：119) 在 android.support.v7.widget.AppCompatTextHelper.updateTypefaceAndStyle(AppCompatTextHelper.java：208) 在 android.support.v7.widget.AppCompatTextHelper.loadFromAttributes(AppCompatTextHelper.java：110) 在 android.support.v7.widget.AppCompatTextHelperV17.loadFromAttributes(AppCompatTextHelperV17.java：38) 在 android.support.v7.widget.AppCompatTextView.(AppCompatTextView.java：81) 在 android.support.v7.widget.AppCompatTextView.(AppCompatTextView.java：71) 在 android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java：103) 在 android.support.v7.app.AppCompatDelegateImplV9.createView(AppCompatDelegateImplV9.java：1024) 在 android.support.v7.app.AppCompatDelegateImplV9.onCreateView(AppCompatDelegateImplV9.java：1081) 在 android.view.LayoutInflater.createViewFromTag(LayoutInflater.java：746) 在 android.view.LayoutInflater.createViewFromTag(LayoutInflater.java：704) at android.view.LayoutInflater.inflate(LayoutInflater.java：492) at android.view.LayoutInflater.inflate(LayoutInflater.java：423) 在 com.example.masoudmk.myapplication.AnswersAdapter.onCreateViewHolder(AnswersAdapter.java：54) 在 com.example.masoudmk.myapplication.AnswersAdapter.onCreateViewHolder(AnswersAdapter.java：13) 在 android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java：6519) 在 android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java：5706) 在 android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java：5589) 在 android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java：5585) 在 android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java：2231) 在 android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java：1558) 在 android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java：1518) 在 android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java：610) 在 android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java：3719) 在 android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java：3135) at android.view.View.measure(View.java：18788) 在 android.support.constraint.ConstraintLayout.internalMeasureChildren(ConstraintLayout.java：934) 在 android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java：973) at android.view.View.measure(View.java：18788) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java：5951) at android.widget.FrameLayout.onMeasure(FrameLayout.java：194) 在 android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java：139) at android.view.View.measure(View.java：18788) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java：5951) 在 android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java：1465) at android.widget.LinearLayout.measureVertical(LinearLayout.java：748) at android.widget.LinearLayout.onMeasure(LinearLayout.java：630) at android.view.View.measure(View.java：18788) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java：5951) at android.widget.FrameLayout.onMeasure(FrameLayout.java：194) at android.view.View.measure(View.java：18788) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java：5951) 在 android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java：1465)at android.widget.LinearLayout.measureVertical(LinearLayout.java：748) at android.widget.LinearLayout.onMeasure(LinearLayout)

apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion '26.0.2'
defaultConfig {
applicationId "com.example.masoudmk.myapplication"
minSdkVersion 15
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
//noinspection GradleCompatible
compile 'com.android.support:appcompat-v7:26.0.2'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:support-v4:26.0.2'
//noinspection GradleCompatible
compile 'com.android.support:support-v13:26.0.2'
// Retrofit
compile 'com.squareup.retrofit2:retrofit:2.3.0'
compile 'com.squareup.okhttp:okhttp:2.4.0'
// JSON Parsing
compile 'com.google.code.gson:gson:2.8.0'
compile 'com.squareup.retrofit2:converter-gson:2.3.0'
enter code here
//noinspection GradleCompatible
compile 'com.android.support:recyclerview-v7:26.0.2'
testCompile 'junit:junit:4.12'
compile 'io.reactivex:rxjava:1.1.6'
compile 'io.reactivex:rxandroid:1.2.1'
compile 'com.squareup.retrofit2:adapter-rxjava:2.1.0'
}

问题出在哪里？

Answer 1

这样更改您的 gradle：

buildToolsVersion "27.0.3"

和

dependencies {
...
compile 'com.android.support:support-v4:27.0.0'
compile 'com.android.support:appcompat-v7:27.0.0'
compile 'com.android.support:recyclerview-v7:27.0.0'
compile 'com.android.support:support-v13:27.0.0'
...

}

Answer 2

我认为问题在于支持库版本。在 app.gradle 文件中检查生成工具版本和依赖项版本。它们必须是相同的。

android: {
....
buildToolsVersion: 'VERSION'
....
}

和

dependencies {
......
compile 'com.android.support:support-v4:VERSION'
compile 'com.android.support:appcompat-v7:VERSION'
compile 'com.android.support:recyclerview-v7:VERSION'
compile 'com.android.support:support-v13:VERSION'
.....
}