android - 如何使特定项目响应点击recyclerView
问题描述
我有一个我想要的新闻应用程序,当点击新闻项目 ( cardview
) 时,它应该打开另一个活动。不幸的是,当点击卡片视图中的新闻项目时,没有任何反应,只有当点击背景(回收器布局)时,活动才会出现。
我希望当cardview
点击新闻项目时,应该打开一个活动,而不是在点击背景时。
newsAdapter.java
package wami.ikechukwu.kanu;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import java.util.ArrayList;
public class newsAdapter extends RecyclerView.Adapter<newsAdapter.viewHolder> {
private ArrayList<dataModel> mDataModel;
private Context context;
private onclicklistener clicklistener;
public newsAdapter(Context context, ArrayList<dataModel> mDataModel, onclicklistener clicklistener) {
this.context = context;
this.mDataModel = mDataModel;
this.clicklistener = clicklistener;
}
@NonNull
@Override
public viewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view =
LayoutInflater.from(context).inflate(R.layout.recyclerview_layout,
viewGroup, false);
return new viewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final newsAdapter.viewHolder viewHolder, final int i) {
dataModel dataModel = mDataModel.get(i);
viewHolder.mTextView.setText(dataModel.getTitle());
viewHolder.mTextDescrip.setText(dataModel.getDescrip());
Glide.with(context).load(dataModel.getImage()).into(viewHolder.mImageView);
}
@Override
public int getItemCount() {
return mDataModel.size();
}
public interface onclicklistener {
void onItemClick(int position);
}
public class viewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView mTextView;
public ImageView mImageView;
public TextView mTextDescrip;
public viewHolder(@NonNull View itemView) {
super(itemView);
mTextView = itemView.findViewById(R.id.layout_text);
mImageView = itemView.findViewById(R.id.layout_image);
mTextDescrip = itemView.findViewById(R.id.layout_descrip);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
int adapterposition = getAdapterPosition();
clicklistener.onItemClick(adapterposition);
}
}
}
MainActivity.java
package wami.ikechukwu.kanu;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import dmax.dialog.SpotsDialog;
public class MainActivity extends AppCompatActivity implements newsAdapter.onclicklistener {
private final String KEY_AUTHOR = "author";
private final String KEY_TITLE = "title";
private final String KEY_DESCRIPTION = "description";
private final String KEY_URL = "url";
private final String KEY_URL_TO_IMAGE = "urlToImage";
private final String KEY_PUBLISHED_AT = "publishedAt";
//this string is appended to the url
String urlLink = "buhari";
ArrayList<dataModel> list;
private RecyclerView recyclerView;
private newsAdapter mAdapter;
private RecyclerView.LayoutManager mLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
setContentView(R.layout.activity_main);
list = new ArrayList<>();
recyclerView = findViewById(R.id.recyclerView);
mAdapter = new newsAdapter(getApplicationContext(), list, this);
mLayout = new LinearLayoutManager(this);
recyclerView.setLayoutManager(mLayout);
recyclerView.setAdapter(mAdapter);
jsonParser();
}
private void jsonParser() {
final AlertDialog progressDialog = new SpotsDialog(this, R.style.customProgressDialog);
progressDialog.show();
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, "https://newsapi.org/v2/everything?q=" + urlLink + "&language=en&sortBy=publishedAt&pageSize=100&apiKey=655446a36e784e79b2b62adcad45be09", null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("articles");
//Using a for loop to get the object (data) in the JSON
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
dataModel dataModel = new dataModel();
dataModel.setTitle(jsonObject.getString(KEY_TITLE));
dataModel.setImage(jsonObject.getString(KEY_URL_TO_IMAGE));
dataModel.setDescrip(jsonObject.getString(KEY_DESCRIPTION));
list.add(dataModel);
}
} catch (JSONException e) {
e.printStackTrace();
}
mAdapter.notifyDataSetChanged();
progressDialog.dismiss();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("Volley", error.toString());
progressDialog.dismiss();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonObjectRequest);
}
@Override
public void onItemClick(int position) {
Toast.makeText(this, "it worked " + position, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(this, news_detail.class);
startActivity(intent);
}
}
recyclerview_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
android:id="@+id/recyclerviewlayout"
android:layout_width="match_parent"
android:layout_height="250dp"
android:layout_marginLeft="5dp"
android:layout_marginTop="10dp"
android:layout_marginRight="5dp"
android:clickable="true"
android:focusable="true"
app:cardCornerRadius="5dp"
app:cardElevation="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="250dp"
android:orientation="vertical">
<TextView
android:id="@+id/layout_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFF"
android:ellipsize="end"
android:maxLines="1"
android:padding="5dp"
android:textColor="#F000"
android:textSize="17sp"
android:textStyle="bold" />
<ImageView
android:id="@+id/layout_image"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:contentDescription="@string/Recyclerview_ImageContent"
android:scaleType="centerCrop" />
<TextView
android:id="@+id/layout_descrip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFF"
android:ellipsize="end"
android:maxLines="3"
android:padding="5dp"
android:textColor="#F000"
android:textSize="15sp" />
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="@color/colorPrimaryDark" />
</LinearLayout>
</android.support.v7.widget.CardView>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical">
</android.support.v7.widget.RecyclerView>
解决方案
我认为应该在 onBindViewHolder 中添加 setOnClickListener 方法
并且您应该通过传递参数来调用另一个活动。
示例:-(在 onBindViewHolder 中)
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// call activity.
Intent intent = new Intent(activity, anotherActivityname.class);
// For passing values
intent.putExtra(key,value);
startActivity(intent);
}
});
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