I built an application that read contacts from a phone (in this case my phone). For the activity where contacts has been displayed, I used TabLayout along with a ViewPager. For displaying the contacts I used RecyclerView. The point is that I handle it how to read contacts and my next movement after that was to open an external activity (MessageToContact_Activity) after clicking on a contact. In present in this activity (MessageToContact_Activity) I want to send a message to the contact that I have selected and for that firstly I am trying to set the contact's name and number to the toolbar's title and subtitle. Instead of default ActionBar I've decided to use a toolbar because is more flexible. The problem is that I don't know how to get the values of name and number and use them into MessageToContact_Activity.
Here is the implementation for Contacts_Fragment:
public class Contacts_Fragment extends Fragment {
View v;
public Contacts_Fragment() {
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
v = inflater.inflate(R.layout.contacts_fragment, container, false);
RecyclerView recyclerView = v.findViewById(R.id.recycleView_search);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
RecyclerView.LayoutManager layoutManager = linearLayoutManager;
recyclerView.setLayoutManager(layoutManager);
ContactsAdapter adapter = new ContactsAdapter(getContext(), getContacts());
recyclerView.setAdapter(adapter);
return v;
}
private List<ContactModel> getContacts() {
List<ContactModel> list = new ArrayList<>();
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.READ_CONTACTS}, 1);
}
Cursor cursor = getContext().getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
null, null, ContactsContract.Contacts.DISPLAY_NAME + " ASC");
cursor.moveToFirst();
while (cursor.moveToNext()) {
list.add(new ContactModel(cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME
)), cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER))));
}
return list;
}
}
Here is the implementation for ContactsAdapter:
public class ContactsAdapter extends RecyclerView.Adapter<ContactsAdapter.ViewHolder> {
private Context mContext;
private LayoutInflater inflater;
private List<ContactModel> mListContacts;
public ContactsAdapter(Context context, List<ContactModel> listContacts){
this.mContext = context;
this.mListContacts = listContacts;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
inflater = LayoutInflater.from(mContext);
View view = inflater.inflate(R.layout.item_contact,parent, false);
final ViewHolder viewHolder = new ViewHolder(view);
viewHolder.item_contact.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
Toast.makeText(mContext, "Test Click "+String.valueOf(viewHolder.getAdapterPosition()), Toast.LENGTH_SHORT).show();
/*This is where I've tried to get them with setters and use them
with getters in MessageToContact_Activity*/
String name = mListContacts.get(viewHolder.getAdapterPosition()).getName();
String number = mListContacts.get(viewHolder.getAdapterPosition()).getNumber();
MessageToContact_Activity mC = new MessageToContact_Activity();
mC.setName(name);
mC.setNumber(number);
/*----------------------------------------------------------------------------*/
onContactClick(view);
}
});
return viewHolder;
}
public void onContactClick(View v){
Intent myIntent = new Intent(v.getContext(), MessageToContact_Activity.class);
mContext.startActivity(myIntent);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
TextView c_name, c_number;
c_name = holder.cV_name;
c_number = holder.cV_number;
c_name.setText(mListContacts.get(position).getName());
c_number.setText(mListContacts.get(position).getNumber());
}
@Override
public int getItemCount() {
return mListContacts.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
TextView cV_name, cV_number;
AppCompatImageButton messageButton;
private LinearLayout item_contact;
public ViewHolder(View itemView){
super(itemView);
cV_name = itemView.findViewById(R.id.name_contact);
cV_number = itemView.findViewById(R.id.phone_contact );
messageButton = itemView.findViewById(R.id.message_button);
item_contact = (LinearLayout) itemView.findViewById(R.id.contact_item_id);
}
}
}
Where you see some code between /**..*/ and /**..*/, I just tried to isolate my methods of getting the values of name and number and to use them for setting the title and subtitle from MessageToContact_Activity.
Here is the implementation for MessageToContact_Activity:
public class MessageToContact_Activity extends AppCompatActivity{
private String name, number;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message_to_contact);
Toolbar toolbar = findViewById(R.id.messageToolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
/*************************/
getSupportActionBar().setTitle(getName());
getSupportActionBar().setSubtitle(getNumber());
/*************************/
}
/*************************/
public MessageToContact_Activity(){}
public String getName() {
return name;
}
public String getNumber() {
return number;
}
public void setName(String name) {
this.name = name;
}
public void setNumber(String number) {
this.number = number;
}
/*************************/
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
if(item.getItemId() == android.R.id.home){
finish();
}
return super.onOptionsItemSelected(item);
}
}
Here are the items of a contact :
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginLeft="16dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:text="Contact Name"
android:id="@+id/name_contact" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Phone Number"
android:id="@+id/phone_contact"/>
</LinearLayout>
I will be so thankful to anyone who could help me. I have a hunch that the solution is not so hard but I still don't know it. And forgive me if there are some things wrong in my code but I'm still at the beginning with android application development.
Activities are not created using new MyActivity(), instead they need to be launched using an intent, as in:
Intent i = new Intent(this, MyActivity.class);
startActivity(i);
If you need to pass to your new activity some parameters, you add them to your intent as extras, like so:
Intent i = new Intent(this, MyActivity.class);
i.putExtra("name", "Bob");
i.putExtra("number", "12345");
startActivity(i);
So in your case, you need to replace your onClick method with something like this:
@Override
public void onClick(View view) {
String name = mListContacts.get(viewHolder.getAdapterPosition()).getName();
String number = mListContacts.get(viewHolder.getAdapterPosition()).getNumber();
Intent myIntent = new Intent(v.getContext(), MessageToContact_Activity.class);
myIntent.putExtra("name", name);
myIntent.putExtra("number", number);
mContext.startActivity(myIntent);
}
Then in your MessageToContact_Activity you can access those extras via:
Bundle extras = getIntent().getExtras();
String name = extras.getString("name");
String number = extras.getString("number");