我編寫(xiě)了一個(gè)代碼，其目標(biāo)是將數(shù)組列表項(xiàng)設(shè)置為回收視圖。但是當(dāng)我運(yùn)行該項(xiàng)目時(shí)，應(yīng)用程序?qū)⒈罎?。d.我檢查依賴關(guān)系。他們沒(méi)事。我檢查了代碼，我認(rèn)為它們沒(méi)有任何問(wèn)題。//主活動(dòng)類public class MainActivity extends AppCompatActivity {RecyclerView rcl_cities;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initViews(); Log.e("ApplicationSays:","LayoutManager set");}private void initViews(){ rcl_cities = findViewById(R.id.rcl_cities); rcl_cities.setLayoutManager(new LinearLayoutManager(this,RecyclerView.VERTICAL,false)); CityAdapter cityAdapter = new CityAdapter(this,getCities()); rcl_cities.setAdapter(cityAdapter);}private ArrayList<City> getCities(){ ArrayList<City> cities = new ArrayList<>(); cities.add(new City(1, "mashhad")); cities.add(new City(2, "Tehran")); cities.add(new City(3, "Gorgan")); cities.add(new City(4, "Shiraz")); cities.add(new City(5, "Rasht")); return cities;}}
1 回答
嗶嗶one
TA貢獻(xiàn)1854條經(jīng)驗(yàn) 獲得超8個(gè)贊
首先，將您的更改view為xmlView
<View
android:layout_width="match_parent"
android:layout_height="3dp"
android:background="@android:color/holo_red_dark" />
其次，你沒(méi)有按照你的onBindViewHolder方法做正確的事情
City city = cities.get(position);
在嘗試向 City 傳遞值之前，應(yīng)先聲明并初始化 City 的實(shí)例。
City city;
//....
city = new City
//...
city.setId(cities.get(position));
這樣您就可以再次測(cè)試您的代碼。
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