我在编写“添加好友”模块时，根据用户输入的用户名，从服务器获取到了相应信息，但将该数据载入recyclerView更新时程序却崩溃了。接下来是我的代码，以及错误日志。求助大家，小白一只，挣扎了一星期也没找到问题所在。
此为主活动部分：思路是获取输入框的用户名，进入Bmob数据库查询。我调试的时候看到用户是成功查询到的。
public class FriendAdd extends AppCompatActivity {
private Button searchUser;
private EditText newFriendName;
private List newFriendList=new ArrayList<>();
private RecyclerView recyclerView;
private StrangerAdapter adapter;
private LinearLayoutManager layoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_friend);
searchUser = (Button) findViewById(R.id.addFriend_button_fingNewFriend);
newFriendName = (EditText) findViewById(R.id.addFriend_editText_inputFriendName);
recyclerView=(RecyclerView)findViewById(R.id.addFriend_recyclerView);
adapter =new StrangerAdapter();
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
searchUser.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String strangerName=newFriendName.getText().toString();
if(strangerName.isEmpty()){
createDialog("用户名为空","请输入您所查找用户的用户名");
}else{
BmobQuery<User> query = new BmobQuery<User>();
query.addWhereEqualTo("trueName", strangerName);
query.findObjects(new FindListener<User>() {
@Override
public void done(List<User> object, BmobException e) {
if(e==null){
for (User gameScore : object) {
//获得信息
Friend newFriend=new Friend(gameScore.gettureName(),gameScore.getdepartment());
newFriendList.add(newFriend);
}
adapter.setDatas(newFriendList);
adapter.notifyDataSetChanged();
}else{
createDialog("查询用户失败",e.getMessage()+e.getErrorCode());
}
}
});
}
}
});
}
private void createDialog(String title, String msg) {
AlertDialog.Builder b=new AlertDialog.Builder(this);
b.setMessage(msg);
b.setTitle(title);
b.setNegativeButton("重试", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int which){
dialog.dismiss();
}
});
b.create().show();
}
}
以下为recyclerView的数据适配器代码：
public class StrangerAdapter extends RecyclerView.Adapter {
private List stranger=new ArrayList<>();
static class ViewHolder extends RecyclerView.ViewHolder{
ImageView friendImage;
TextView friendName;
TextView friendDepartment;
public ViewHolder(View view){
super(view);
friendImage=(ImageView)view.findViewById(R.id.friendSearch_image_head);
friendName=(TextView)view.findViewById(R.id.friendSearch_textView_userName);
friendDepartment=(TextView)view.findViewById(R.id.friendSearch_textView_department);
}
}
public StrangerAdapter() { };
public StrangerAdapter(List<Friend> friendList){
stranger=friendList;
}
public ViewHolder onCreateViewHolder(ViewGroup parent,int viewType){
View view=LayoutInflater.from(parent.getContext()).inflate(R.layout.friend_list_item,parent,false);
ViewHolder holder=new ViewHolder(view);
return holder;
}
public void onBindViewHolder(ViewHolder holder,int position){
Friend friend=stranger.get(position);
holder.friendImage.setImageResource(friend.getImageId());
holder.friendName.setText(friend.getName());
holder.friendDepartment.setText(friend.getLocation());
}
public int getItemCount(){
return stranger.size();
}
public void setDatas(List<Friend> list) {
stranger.clear();
if (null != list) {
stranger.addAll(list);
}
}
}
以下是崩溃后输出的错误日志
04-23 15:28:24.143 16212-16212/com.example.schoolpet E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.schoolpet, PID: 16212
java.lang.ExceptionInInitializerError
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1070)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2349)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2511)
at android.app.ActivityThread.access$900(ActivityThread.java:165)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1375)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5621)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context cn.bmob.v3.BmobWrapper.getApplicationContext()' on a null object reference
at cn.bmob.v3.Bmob.Code(Bmob.java:117)
at cn.bmob.v3.Bmob.getApplicationContext(Bmob.java:129)
at cn.bmob.v3.b.The.(SPUtil.java:28)
at cn.bmob.v3.BmobUser.getCurrentUser(BmobUser.java:871)
at com.example.schoolpet.PetPage.(PetPage.java:59)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1070)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2349)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2511)
at android.app.ActivityThread.access$900(ActivityThread.java:165)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1375)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5621)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
