大佬教程收集整理的这篇文章主要介绍了Android-Intent在我的RecyclerView中不起作用，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
我使用以下代码：
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.button;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
public MyAdapter (Context context, ArrayList<PersonData>peopleDataSet) {
this.context = context;
this.peopleDataSet = peopleDataSet;
}
Context context;
private ArrayList<PersonData> peopleDataSet;
public static class MyViewHolder extends RecyclerView.ViewHolder {
TextView textViewName;
TextView textViewEmail;
ImageView imageViewIcon;
Button button;
public MyViewHolder(View itemView) {
super(itemView);
this.textViewName = (TextView) itemView.findViewById(R.id.textViewName);
this.textViewEmail = (TextView) itemView.findViewById(R.id.textViewEmail);
this.imageViewIcon = (ImageView) itemView.findViewById(R.id.imageView);
this.button = (Button) itemView.findViewById(R.id.button);
}
}
public MyAdapter(ArrayList<PersonData> peoplE) {
this.peopleDataSet = people;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewTypE) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.cards_layout, parent, falsE);
view.setOnClickListener(MainActivity.myOnClickListener);
MyViewHolder myViewHolder = new MyViewHolder(view);
return myViewHolder;
}
@Override
public void onBindViewHolder(final MyViewHolder holder, final int listPosition) {
TextView textViewName = holder.textViewName;
final TextView textViewEmail = holder.textViewEmail;
ImageView imageView = holder.imageViewIcon;
Button button = holder.button;
button.setOnClickListener(new View.onClickListener() {
@Override
public void onClick(View v) {
Intent myIntent = new Intent(context, MainActivity2Activity.class);
context.startActivity(myIntent);
}
});
textViewName.setText(peopleDataSet.get(listPosition).getName());
textViewEmail.setText(peopleDataSet.get(listPosition).getEmail());
imageView.setImageresource(peopleDataSet.get(listPosition).getImage());
}
@Override
public int getItemCount() {
return peopleDataSet.size();
}
}
但是当我按下按钮时,出现以下错误：
尝试在空对象引用上调用虚拟方法java.lang.String android.content.Context.getPackagename()
还有一个问题,如何识别“列表”中的每个按钮,以便它们将启动不同的活动.
@H_710_0@mainActivity2Activity.java
import android.support.v7.app.ActionBarActivity;
import android.os.bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity2Activity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceStatE) {
super.onCreate(savedInstanceStatE);
setContentView(R.layout.activity_main_activity2);
}
@Override
public Boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main_activity2, menu);
return true;
}
@Override
public Boolean onOptionsItemSELEcted(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_setTings) {
return true;
}
return super.onOptionsItemSELEcted(item);
}
}
logcat的
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackagename()' on a null object reference
at android.content.ComponentName.<init>(ComponentName.java:77)
at android.content.Intent.<init>(Intent.java:4000)
at info.osoap.myapplicationzzz.MyAdapter$1.onClick(MyAdapter.java:70)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallBACk(Handler.java:739)
at android.os.Handler.dispatchmessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
import android.content.Context;
import android.os.bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.RecyclerView;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.button;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends ActionBarActivity {
private static RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager layoutManager;
private static RecyclerView recyclerView;
private static ArrayList<PersonData> people;
static View.onClickListener myOnClickListener;
private static ArrayList<Integer> removedItems;
@Override
protected void onCreate(Bundle savedInstanceStatE) {
super.onCreate(savedInstanceStatE);
setContentView(R.layout.activity_main);
myOnClickListener = new MyOnClickListener(this);
recyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
recyclerView.setHasFixedSize(true);
layoutManager = new linearlayoutmanager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
people = new ArrayList<PersonData>();
for (int i = 0; i < MyData.nameArray.length; i++) {
people.add(new PersonData(
MyData.nameArraY[i],
MyData.emailArraY[i],
MyData.drawableArraY[i],
MyData.id_[i]
));
}
removedItems = new ArrayList<Integer>();
adapter = new MyAdapter(peoplE);
recyclerView.setAdapter(adapter);
}
private static class MyOnClickListener implements View.onClickListener {
private final Context context;
private MyOnClickListener(Context context) {
this.context = context;
}
@Override
public void onClick(View v) {
removeItem(v);
}
private void removeItem(View v) {
int SELEctedItemPosition = recyclerView.getChildPosition(v);
RecyclerView.ViewHolder viewHolder
= recyclerView.findViewHolderForPosition(SELEctedItemPosition);
TextView textViewName
= (TextView) viewHolder.itemView.findViewById(R.id.textViewName);
String SELEctedName = (String) textViewName.getText();
int SELEctedItemId = -1;
for (int i = 0; i < MyData.nameArray.length; i++) {
if (SELEctedName.equals(MyData.nameArraY[i])) {
SELEctedItemId = MyData.id_[i];
}
}
removedItems.add(SELEctedItemId);
people.remove(SELEctedItemPosition);
adapter.notifyItemRemoved(SELEctedItemPosition);
}
}
@Override
public Boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public Boolean onOptionsItemSELEcted(MenuItem item) {
super.onOptionsItemSELEcted(item);
if (item.getItemId() == R.id.action_add_item) {
// check if any items to add
if (removedItems.size() != 0) {
addRemovedItemToList();
} else {
Toast.makeText(this, "Nothing to add", Toast.LENGTH_SHORT).show();
}
}
return true;
}
private void addRemovedItemToList() {
int addItemAtListPosition = 3;
people.add(addItemAtListPosition, new PersonData(
MyData.nameArraY[removedItems.get(0)],
MyData.emailArraY[removedItems.get(0)],
MyData.drawableArraY[removedItems.get(0)],
MyData.id_[removedItems.get(0)]
));
adapter.notifyItemInserted(addItemAtListPosition);
removedItems.remove(0);
}
}
解决方法:
上下文可能为null尝试如下：
public void onClick(View v) {
Intent myIntent = new Intent(v.getContext(), MainActivity2Activity.class);
v.getContext().startActivity(myIntent);
}
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