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アプリがサーバーからJ sonとデータを読み取って、そのデータをカードビューで表示しても問題ありません。しかし、画像を追加してサーバーからカードビューに画像を読み込む必要があります。これを行うにはグライドライブラリを使用してください。しかし、このライブラリを追加すると、私のアプリは強制的に停止します。ここに私のコードは次のとおりです。アンドロイドスタジオでグライドが動作しない
MainActivity：
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private ArrayList<AndroidVersion> data;
private DataAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_page);
initViews();
}
private void initViews(){
recyclerView = (RecyclerView)findViewById(R.id.card_recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
loadJSON();
}
private void loadJSON(){
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://memaraneha.ir/")
.addConverterFactory(GsonConverterFactory.create())
.build();
RequestInterface request = retrofit.create(RequestInterface.class);
Call<JSONResponse> call = request.getJSON();
call.enqueue(new Callback<JSONResponse>() {
@Override
public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {
JSONResponse jsonResponse = response.body();
data = new ArrayList<>(Arrays.asList(jsonResponse.getAndroid()));
adapter = new DataAdapter(data);
recyclerView.setAdapter(adapter);
}
@Override
public void onFailure(Call<JSONResponse> call, Throwable t) {
Log.d("Error",t.getMessage());
}
});
}
}
JSONResponse：
public class JSONResponse {
private AndroidVersion[] android;
public AndroidVersion[] getAndroid() {
return android;
}
}
のDataAdapter：
public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> {
private Context context;
private ArrayList<AndroidVersion> android;
public DataAdapter(ArrayList<AndroidVersion> android) {
this.android = android;
}
@Override
public DataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_row, viewGroup, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(DataAdapter.ViewHolder viewHolder, int i) {
viewHolder.tv_name.setText(android.get(i).getName());
viewHolder.tv_version.setText(android.get(i).getVer());
viewHolder.tv_api_level.setText(android.get(i).getApi());
// load image into imageview using glide
Glide.with(context).load("http://memaraneha.ir/Erfan/images/"+android.get(i).getPic())
.placeholder(R.drawable.truiton)
.error(R.drawable.truiton)
.into(viewHolder.tv_image);
}
@Override
public int getItemCount() {
return android.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private TextView tv_name,tv_version,tv_api_level;
public ImageView tv_image;
public ViewHolder(View view) {
super(view);
tv_name = (TextView)view.findViewById(R.id.tv_name);
tv_version = (TextView)view.findViewById(R.id.tv_version);
tv_api_level = (TextView)view.findViewById(R.id.tv_api_level);
tv_image= (ImageView) view.findViewById(R.id.img);
}
}
}
AndroidVersion：
public class AndroidVersion {
private String ver;
private String name;
private String api;
private String pic;
public String getVer() {
return ver;
}
public String getName() {
return name;
}
public String getApi() {
return api;
}
public String getPic(){
return pic;
}
}
RequestInterface：
public interface RequestInterface {
@GET("Erfan/ret.php")
Call<JSONResponse> getJSON();
}
card_row.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
card_view:cardCornerRadius="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:orientation="vertical">
<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/tv_name"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:textSize="18sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_version"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/tv_api_level"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
main_page.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/card_recycler_view"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
と、この私のJSON：
{ "android":
[
{ "ver": "1.5", "name": "Cupcake", "api": "API level 3","pic":"pic1.jpg" },
{ "ver": "1.6", "name": "Donut", "api": "API level 4","pic":"pic2.jpg" },
{ "ver": "2.0 - 2.1", "name": "Eclair", "api": "API level 5 - 7","pic":"pic3.jpg" },
{ "ver": "2.2", "name": "Froyo", "api": "API level 8","pic":"pic4.jpg" },
{ "ver": "2.3", "name": "Gingerbread", "api": "API level 9 - 10","pic":"pic5.jpg" },
{ "ver": "3.0 - 3.2", "name": "Honeycomb", "api": "API level 11 - 13","pic":"pic6.jpg" },
{ "ver": "4.0", "name": "Ice Cream Sandwich", "api": "API level 14 - 15","pic":"pic7.jpg" },
{ "ver": "4.1 - 4.3", "name": "JellyBean", "api": "API level 16 - 18","pic":"pic8.jpg" },
{ "ver": "4.4", "name": "KitKat", "api": "API level 19","pic":"pic9.jpg" },
{ "ver": "5.0 - 5.1", "name": "Lollipop", "api": "API level 21 - 22","pic":"pic10.jpg" },
{ "ver": "6.0", "name": "Marshmallow", "api": "API level 23","pic":"pic11.jpg" }
]
}
、これが私ですexeption：
致命的な例外：メインjava.lang.IllegalArgumentException：nullにロードを開始できません。Context com.bumptech.glide.manager.RequestManagerRetriever.get（Reque stManagerRetriever.j ava：83）com.bumptech。 glide.with（Glide.java:609）com.exampleret.DataAdapter.onBindViewHolder（DataAdapter.java：44）com.example.ret.DataAdapter.onBindViewHolder（DataAdapter.jav a：19）