我是Android开发领域的新手，我的简单项目（使用API）遇到了问题。我正在使用Android Studio 当我启动该应用程序时，它会出现如下错误：
E / dalvikvm：找不到 类“ android.support.v4.view.ViewCompat $ OnUnhandledKeyEventListenerWrapper”， 从方法引用 android.support.v4.view.ViewCompat.addOnUnhandledKeyEventListener
E / dalvikvm：找不到类“ android.view.WindowInsets”， 从方法引用 android.support.v4.view.ViewCompat.dispatchApplyWindowInsets
E / dalvikvm：找不到类“ android.view.WindowInsets”， 从方法引用 android.support.v4.view.ViewCompat.onApplyWindowInsets
E / dalvikvm：找不到课程 从以下位置引用的“ android.view.View $ OnUnhandledKeyEventListener” 方法 android.support.v4.view.ViewCompat.removeOnUnhandledKeyEventListener
E / dalvikvm：找不到课程 从方法引用的'android.support.v4.view.ViewCompat $ 1' android.support.v4.view.ViewCompat.setOnApplyWindowInsetsListener
我无法理解到底是什么引起了问题，但我想原因可能出在我设备的API级别上-我正在使用API级别为19（Android版本4.4.2）的设备
如果有人甚至给我一个大概的建议来解决这个问题，那将非常有帮助，因为我不知道该怎么做
我的摇篮：
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:cardview-v7:28.0.0'
implementation 'com.android.support:recyclerview-v7:28.0.0'
implementation 'com.squareup.retrofit2:retrofit:2.3.0'
implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
implementation 'com.github.bumptech.glide:glide:4.3.1'
implementation 'com.android.support:support-v4:28.0.0'
}
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.1.4'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
ApiInterface.java：
import retrofit2.Call;
import retrofit2.http.GET;
public interface ApiInterface {
@GET("search/shows?q=girls")
Call <List<Movie>> getMovies();
}
TvMazeApiClient.java
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
public class TvMazeApiClient {
public static String BASE_URL ="https://www.tvmaze.com/api/";
private static Retrofit retrofit;
public static Retrofit getClient(){
if(retrofit == null){
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
}
主要活动：
public class MainActivity extends AppCompatActivity {
private SearchView searchView;
private RecyclerView recyclerView;
private MovieAdapter movieAdapter;
private List<Movie> movieList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
movieAdapter = new MovieAdapter();
recyclerView.setAdapter(movieAdapter);
movieList = new ArrayList<>();
ApiInterface apiService = TvMazeApiClient.getClient().create(ApiInterface.class);
Call<List<Movie>> call = apiService.getMovies();
call.enqueue(new Callback<List<Movie>>() {
@Override
public void onResponse(Call<List<Movie>> call, Response<List<Movie>> response) {
movieList = response.body();
Log.d("TAG","Response = "+movieList);
movieAdapter.setMovieList(getApplicationContext(),movieList);
}
@Override
public void onFailure(Call<List<Movie>> call, Throwable t) {
Log.d("TAG","Response = "+t.toString());
Toast.makeText(MainActivity.this,t.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.options_menu, menu);
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
searchView = (SearchView) menu.findItem(R.id.action_search)
.getActionView();
searchView.setSearchableInfo(searchManager
.getSearchableInfo(getComponentName()));
searchView.setMaxWidth(Integer.MAX_VALUE);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
movieAdapter.getFilter().filter(query);
return false;
}
@Override
public boolean onQueryTextChange(String query) {
movieAdapter.getFilter().filter(query);
return false;
}
});
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_search) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed() {
if (!searchView.isIconified()) {
searchView.setIconified(true);
return;
}
super.onBackPressed();
}}
适配器：
public class MovieAdapter extends RecyclerView.Adapter<MovieAdapter.MyViewHolder> implements Filterable {
private List<Movie> movieList;
private List<Movie> movieListFiltered;
private Context context;
public void setMovieList(Context context,final List<Movie> movieList){
this.context = context;
this.movieList = movieList;
this.movieListFiltered = movieList;
}
@Override
public MovieAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item,parent,false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(MovieAdapter.MyViewHolder holder, int position) {
holder.title.setText(movieListFiltered.get(position).getTitle());
Glide.with(context).load(movieList.get(position).getImageUrl()).apply(RequestOptions.centerCropTransform()).into(holder.image);
}
@Override
public int getItemCount() {
if(movieList != null){
return movieListFiltered.size();
} else {
return 0;
}
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence charSequence) {
String charString = charSequence.toString();
if (charString.isEmpty()) {
movieListFiltered = movieList;
} else {
List<Movie> filteredList = new ArrayList<>();
for (Movie movie : movieList) {
if (movie.getTitle().toLowerCase().contains(charString.toLowerCase())) {
filteredList.add(movie);
}
}
movieListFiltered = filteredList;
}
FilterResults filterResults = new FilterResults();
filterResults.values = movieListFiltered;
return filterResults;
}
@Override
protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
movieListFiltered = (ArrayList<Movie>) filterResults.values;
notifyDataSetChanged();
}
};
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView title;
ImageView image;
public MyViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.title);
image = (ImageView)view.findViewById(R.id.image);
}
}
}