Saturday, January 31, 2015

Android beginner tutorial Part 74 Calling contacts confirming deletion

In this tutorial well add the ability to call contacts by clicking their name, as well as add a confirmation window when deleting contacts.

Go to onCreate() function and add an item click listener for the list. In the handler, retreive the phone number value using the cursor and then use a function call() with the number as the parameter:

list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
cursor.moveToPosition(position);
call(cursor.getString(2));
}
});

Full onCreate() function:

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

ListView list = (ListView)findViewById(R.id.contactList);
list.setOnItemLongClickListener(new OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
dialogEdit(position, id);
return true;
}
});

list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
cursor.moveToPosition(position);
call(cursor.getString(2));
}
});

updateList();
}

The call() method receives the phone number and calls it using an intent.

public void call(String phone){
        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setData(Uri.parse("tel:"+phone));
        startActivity(callIntent);
}

Make sure that phone calling is permitted in AndroidManifest.xml:

<uses-permission android:name="android.permission.CALL_PHONE"/>

Now declare a new variable, deleteDialog:

private AlertDialog deleteDialog;

In the dialogEdit() function, find the part where the Negative button is set. In the click handler, call a function called deleteConfirm() and pass the id as an integer as the parameter:

builder.setNegativeButton("Delete", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
deleteConfirm((int)id);
}
});


Full dialogEdit() function:

public void dialogEdit(final int position, final long id){
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

LayoutInflater inflater = LayoutInflater.from(getApplicationContext());
alertView = inflater.inflate(R.layout.add_window, null);
builder.setView(alertView);

builder.setTitle("Edit contact");

builder.setPositiveButton("Save", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
EditText t_name = (EditText)alertView.findViewById(R.id.inp_name);
EditText t_phone = (EditText)alertView.findViewById(R.id.inp_phone);
String new_name = t_name.getText().toString();
String new_phone = t_phone.getText().toString();
ContentValues values = new ContentValues();
values.put(myDbHelper.NAME, new_name);
values.put(myDbHelper.PHONE, new_phone);
getContentResolver().update(CONTENT_URI, values, myDbHelper._ID+"="+id, null);
updateList();
}
});

builder.setNegativeButton("Delete", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
deleteConfirm((int)id);
}
});

builder.setCancelable(true);

EditText t_name = (EditText)alertView.findViewById(R.id.inp_name);
EditText t_phone = (EditText)alertView.findViewById(R.id.inp_phone);
cursor.moveToPosition(position);
t_name.setText(cursor.getString(1));
t_phone.setText(cursor.getString(2));

editDialog = builder.create();
editDialog.show();
}

Create the deleteConfirm() function. Inside of it, build a new Dialog with two buttons - a positive "Delete" and negative "Cancel".

Delete the contact from the database when "Delete" is pressed, and do nothing when "Cancel" is pressed:

public void deleteConfirm(final int id){
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

builder.setTitle("Delete contact?");
builder.setMessage("Are you sure you want to delete this contact?");

builder.setPositiveButton("Delete", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
getContentResolver().delete(CONTENT_URI, myDbHelper._ID+"="+id, null);
updateList();
}
});

builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
}
});

builder.setCancelable(true);

deleteDialog = builder.create();
deleteDialog.show();
}

Thats all! Here is the full code:

package com.kircode.codeforfood_test;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;

public class MainActivity extends Activity{

private static final Uri CONTENT_URI = Uri.parse("content://com.kircode.codeforfood_test.mycontentprovider/contacts");
private static final int IDM_ADD = 101;

private AlertDialog addDialog;
private AlertDialog deleteDialog;
private AlertDialog editDialog;
private View alertView;
private Cursor cursor;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

ListView list = (ListView)findViewById(R.id.contactList);
list.setOnItemLongClickListener(new OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
dialogEdit(position, id);
return true;
}
});

list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
cursor.moveToPosition(position);
call(cursor.getString(2));
}
});

updateList();
}

@Override
public boolean onCreateOptionsMenu(Menu menu){
menu.add(Menu.NONE, IDM_ADD, Menu.NONE, "Add");
return(super.onCreateOptionsMenu(menu));
}

@Override
public boolean onOptionsItemSelected(MenuItem item){
switch(item.getItemId()){
case IDM_ADD:
dialogAdd();
break;
}
return(super.onOptionsItemSelected(item));
}

public void call(String phone){
        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setData(Uri.parse("tel:"+phone));
        startActivity(callIntent);
}

public void dialogAdd(){
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

LayoutInflater inflater = LayoutInflater.from(getApplicationContext());
alertView = inflater.inflate(R.layout.add_window, null);
builder.setView(alertView);

builder.setTitle("Add contact");

builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
EditText t_name = (EditText)alertView.findViewById(R.id.inp_name);
EditText t_phone = (EditText)alertView.findViewById(R.id.inp_phone);
String new_name = t_name.getText().toString();
String new_phone = t_phone.getText().toString();
ContentValues values = new ContentValues();
values.put(myDbHelper.NAME, new_name);
values.put(myDbHelper.PHONE, new_phone);
getContentResolver().insert(CONTENT_URI, values);
updateList();
}
});

builder.setCancelable(true);
addDialog = builder.create();

addDialog.show();
}

public void dialogEdit(final int position, final long id){
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

LayoutInflater inflater = LayoutInflater.from(getApplicationContext());
alertView = inflater.inflate(R.layout.add_window, null);
builder.setView(alertView);

builder.setTitle("Edit contact");

builder.setPositiveButton("Save", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
EditText t_name = (EditText)alertView.findViewById(R.id.inp_name);
EditText t_phone = (EditText)alertView.findViewById(R.id.inp_phone);
String new_name = t_name.getText().toString();
String new_phone = t_phone.getText().toString();
ContentValues values = new ContentValues();
values.put(myDbHelper.NAME, new_name);
values.put(myDbHelper.PHONE, new_phone);
getContentResolver().update(CONTENT_URI, values, myDbHelper._ID+"="+id, null);
updateList();
}
});

builder.setNegativeButton("Delete", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
deleteConfirm((int)id);
}
});

builder.setCancelable(true);

EditText t_name = (EditText)alertView.findViewById(R.id.inp_name);
EditText t_phone = (EditText)alertView.findViewById(R.id.inp_phone);
cursor.moveToPosition(position);
t_name.setText(cursor.getString(1));
t_phone.setText(cursor.getString(2));

editDialog = builder.create();
editDialog.show();
}

public void deleteConfirm(final int id){
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

builder.setTitle("Delete contact?");
builder.setMessage("Are you sure you want to delete this contact?");

builder.setPositiveButton("Delete", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
getContentResolver().delete(CONTENT_URI, myDbHelper._ID+"="+id, null);
updateList();
}
});

builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
}
});

builder.setCancelable(true);

deleteDialog = builder.create();
deleteDialog.show();
}

public void updateList(){
String[] columns = new String[] {myDbHelper._ID, myDbHelper.NAME, myDbHelper.PHONE};
ContentResolver resolver = getContentResolver();
cursor = resolver.query(CONTENT_URI, columns, null, null, null);

final ListAdapter adapter = new SimpleCursorAdapter(this, R.layout.customrow, cursor, new String[] {myDbHelper.NAME, myDbHelper.PHONE}, new int[] {R.id.t_name, R.id.t_phone}, 0);
ListView list = (ListView)findViewById(R.id.contactList);
list.setAdapter(adapter);
}

}

We now have a simple application that lets us create a simple editable contact list, which we can use to call people.

Thanks for reading!
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