Recycler View onClickListener 无法将 Intent putExtra 发送到其他活动

Question

我想使用 Recyclerview onClick Listerner 将我的字符串值从 My recyclerview 发送到 JobDetail Activity。但是当我使用 putExtra 并使用 getStringExtrast 检索意图时，它总是返回 null。

这是我的 RecyclerView 适配器 DiscoverAdapter.java

public class DiscoverAdapter extends RecyclerView.Adapter<DiscoverAdapter.ViewHolder>{
public List<JobPost> jobsList;
public Context context;
private Intent jobDetailActivity;
private FirebaseAuth mAuth ;
private FirebaseUser user;

public DiscoverAdapter(Context context, List<JobPost> jobsList){
    this.context = context;
    this.jobsList = jobsList;
    mAuth = FirebaseAuth.getInstance();
    user = mAuth.getCurrentUser();
}


@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.job_list,parent,false);
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
    holder.tittle_text.setText(jobsList.get(position).getTittle());
    holder.budget_text.setText(jobsList.get(position).getBudget());
    final String description = jobsList.get(position).getDescription();
    final String email = jobsList.get(position).getEmail();
    final String status = jobsList.get(position).getStatus();
    final String username = jobsList.get(position).getUsername();
    final String titlle = holder.tittle_text.getText().toString();
    final String budget = holder.budget_text.getText().toString();
    final String coba="";

    //get post id

    final String post_id = jobsList.get(position).postId;
    holder.mView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            jobDetailActivity=null;
            int post = position;
            try {
                String current_email = user.getEmail();

                FirebaseUser user = mAuth.getCurrentUser();
                if(user !=null ){
                    jobDetailActivity = new Intent(v.getContext(), JobDetailActivityLogin.class);
                }





            }
            catch(Exception e){
                jobDetailActivity = new Intent(v.getContext(), JobDetailActivity.class);
            }




            jobDetailActivity.putExtra("coba",coba);
            jobDetailActivity.putExtra("postId",post_id);
            jobDetailActivity.putExtra("username",username);
            jobDetailActivity.putExtra("description",description);
            jobDetailActivity.putExtra("tittle",titlle);
            jobDetailActivity.putExtra("email",email);
            jobDetailActivity.putExtra("budget",budget);
            jobDetailActivity.putExtra("status",status);
            v.getContext().startActivity(jobDetailActivity);
            Toast.makeText(v.getContext(), "CLICKED " + post_id + ", " + description + ", " + titlle + ", " + email + ", " + budget+","+status, Toast.LENGTH_SHORT).show();


        }
    });




}

@Override
public int getItemCount() {
    return jobsList.size();
}

public class ViewHolder extends RecyclerView.ViewHolder{
    View mView;
    public TextView tittle_text;
    public TextView budget_text;
    /**
    public TextView description_text,email_text, status_text,username_text;
    **/

    public ViewHolder(View itemView) {
        super(itemView);
        mView = itemView;
        tittle_text = (TextView)mView.findViewById(R.id.tittle_text);
        budget_text = (TextView)mView.findViewById(R.id.budget_text);
    }
}

}

这是我的JobDetailActivity

public class JobDetailActivity extends AppCompatActivity {
private String tittle,description,status,username,budget,postId,email = "Null";
private Intent intent =getIntent();
private TextView txtTittle, txtDesc, txtStatus, txtUsername, txtBudget, txtPostId, txtEmail;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_job_detail);
    Toolbar toolbar = (Toolbar) findViewById(R.id.my_toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setDisplayShowHomeEnabled(true);




    tittle= intent.getStringExtra("tittle");

    description= intent.getStringExtra("description");
    status= intent.getStringExtra("status");
    username= intent.getStringExtra("username");
    budget= intent.getStringExtra("budget");
    postId= intent.getStringExtra("postId");
    email= intent.getStringExtra("email");



    txtTittle = (TextView)findViewById(R.id.txt_detailTittle);
    txtDesc = (TextView)findViewById(R.id.txt_desc);
    txtStatus = (TextView)findViewById(R.id.txt_status);
    txtUsername = (TextView)findViewById(R.id.txt_username);
    txtBudget = (TextView)findViewById(R.id.txt_budget);

    txtTittle.setText(tittle);
    txtDesc.setText(description);
    txtStatus.setText(status);
    txtUsername.setText(username);
    txtBudget.setText(budget);
    Toast.makeText(getApplicationContext(), "CLICKED " + postId + ", " + description + ", " + tittle + ", " + email + ", " + budget+","+status, Toast.LENGTH_SHORT).show();








}
@Override
public boolean onSupportNavigateUp() {
    onBackPressed();
    return true;
}

}

这个我的错误：

java.lang.RuntimeException：无法启动活动 ComponentInfo{com.example.kodingsquad.lancerlots/com.example.kodingsquad.lancerlots.JobDetailActivity}：java.lang.NullPointerException：尝试调用虚拟方法 'java.lang.空对象引用上的字符串 android.content.Intent.getStringExtra(java.lang.String)'

Answer 1

而不是这个

tittle= intent.getStringExtra("tittle");

使用这个

tittle= getIntent().getStringExtra("tittle");

你可以使用这个 private Intent intent =getIntent(); 上 onCreate() 因为意图不存在并且在那里为空