I have 2 activities- main activity and OTP activity. In main activity,in edittext inside card view, I put the phone number. Then i press send otp button. It takes me to next activity, that is otp activity. But when I press the back button, the application exits. It does not go back to main activity.
CODE:
Main_activity.java:
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener{
String[] countryNames={" 91"," 86"," 61"," 351"," 1"," 64"};
int flags[] = {R.drawable.india, R.drawable.china, R.drawable.australia, R.drawable.portugal, R.drawable.america, R.drawable.new_zealand};
Spinner spin;
EditText edt;
Button btn;
String totalNumber;
int phoneSuccessCode;
String NUM = "EXTRA_PHONE_NUMBER";
Data datum = null;
String url = "https://swulj.000webhostapp.com/sms2.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
//Getting the instance of Spinner and applying OnItemSelectedListener on it
spin = (Spinner) findViewById(R.id.simpleSpinner);
edt = (EditText) findViewById(R.id.phNum);
btn = (Button) findViewById(R.id.buttonOTP);
spin.setOnItemSelectedListener(this);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String text = spin.getSelectedItem().toString();
text = edt.getText().toString();
totalNumber = text;
PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
try {
Phonenumber.PhoneNumber swissNumberProto = phoneUtil.parse(totalNumber, "CH");
// This will check if the phone number is real and it's length is valid.
boolean isPossible = phoneUtil.isPossibleNumber(swissNumberProto);
if(isPossible)
{
//edt.setText("OK");
phoneSuccessCode = 1;
}
else {
//edt.setText("Not OK");
phoneSuccessCode = 0;
}
} catch (NumberParseException e) {
System.err.println("NumberParseException was thrown: " e.toString());
//edt.setText("exception");
phoneSuccessCode = -1;
}
switch(phoneSuccessCode){
case 1:
edt.setText("OK");
break;
case 0:
edt.setText("Not OK");
Toast.makeText(getApplicationContext(), "Enter valid number", Toast.LENGTH_LONG).show();
break;
case -1:
edt.setText("exception");
Toast.makeText(getApplicationContext(), "Enter valid number", Toast.LENGTH_LONG).show();
break;
default:
break;
}
/*datum = new Data(url, totalNumber);
HTTPConnection1 conn = new HTTPConnection1();
conn.execute(datum);*/
Intent inte = new Intent(MainActivity.this,
OTPActivity.class);
inte.putExtra(NUM,totalNumber);
startActivity(inte);
//invoke the SecondActivity.
finish();
}
});
CustomAdapter customAdapter=new CustomAdapter(getApplicationContext(),flags,countryNames);
spin.setAdapter(customAdapter);
}
//Performing action onItemSelected and onNothing selected
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long id) {
//Toast.makeText(getApplicationContext(), countryNames[position], Toast.LENGTH_LONG).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
class HTTPConnection1 extends AsyncTask<Data, Void, String> {
String phone;
String url;
String result;
@Override
protected String doInBackground(Data... params) {
Data data = params[0];
url = data.url;
phone = data.phone;
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("phone", phone));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse httpResponse = httpclient.execute(httppost);
InputStream inputStream = httpResponse.getEntity().getContent();
//HTTPResult.setText("result3");
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
//HTTPResult.setText("result4");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
//HTTPResult.setText("result5");
StringBuilder stringBuilder = new StringBuilder();
//HTTPResult.setText("result6");
String bufferedStrChunk = null;
while ((bufferedStrChunk = bufferedReader.readLine()) != null) {
stringBuilder.append(bufferedStrChunk);
}
result = stringBuilder.toString();
//result= "Sandeep";
} catch (ClientProtocolException e) {
result = "ClientProtocolException";
// TODO Auto-generated catch block
} catch (IOException e) {
result = "IOException";
// TODO Auto-generated catch block
}
return null;
}
@Override
protected void onPostExecute(String bitmap) {
super.onPostExecute(bitmap);
//HTTPResult.setText(result);
//parseAndNewIntent(result);
}
}
}
OTP_activity.java:
public class OTPActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener{
private EditText editText1, editText2, editText3, editText4, editText5, editText6;
private EditText[] editTexts;
CountDownTimer cTimer = null;
TextView tv;
TextView txt;
TextView cnt, msg, test;
Button resend;
String mob;
String NUM = "EXTRA_PHONE_NUMBER";
int resendCount = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_otpactivity2);
Intent i = getIntent();
mob = i.getStringExtra(NUM);
txt= (TextView) findViewById(R.id.text);
txt.setText(txt.getText().toString() mob);
tv = (TextView) findViewById(R.id.timer);
cnt = (TextView) findViewById(R.id.count);
msg = (TextView) findViewById(R.id.msg);
test = (TextView) findViewById(R.id.test);
resend = (Button) findViewById(R.id.ResendOTP);
editText1 = (EditText) findViewById(R.id.otpEdit1);
editText2 = (EditText) findViewById(R.id.otpEdit2);
editText3 = (EditText) findViewById(R.id.otpEdit3);
editText4 = (EditText) findViewById(R.id.otpEdit4);
editText5 = (EditText) findViewById(R.id.otpEdit5);
editText6 = (EditText) findViewById(R.id.otpEdit6);
editTexts = new EditText[]{editText1, editText2, editText3, editText4, editText5, editText6};
editText1.addTextChangedListener(new PinTextWatcher(0));
editText2.addTextChangedListener(new PinTextWatcher(1));
editText3.addTextChangedListener(new PinTextWatcher(2));
editText4.addTextChangedListener(new PinTextWatcher(3));
editText5.addTextChangedListener(new PinTextWatcher(4));
editText6.addTextChangedListener(new PinTextWatcher(5));
editText1.setOnKeyListener(new PinOnKeyListener(0));
editText2.setOnKeyListener(new PinOnKeyListener(1));
editText3.setOnKeyListener(new PinOnKeyListener(2));
editText4.setOnKeyListener(new PinOnKeyListener(3));
editText5.setOnKeyListener(new PinOnKeyListener(4));
editText6.setOnKeyListener(new PinOnKeyListener(5));
startTimer();
resend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
resendCount ;
cnt.setText(String.valueOf(resendCount) " of 3");
startTimer();
}
});
}
void startTimer() {
resend.setEnabled(false);
cTimer = new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
tv.setText("seconds remaining: " String.valueOf(millisUntilFinished/1000));
}
public void onFinish() {
tv.setText("Re send OTP!");
resend.setEnabled(true);
}
};
cTimer.start();
}
//cancel timer
void cancelTimer() {
if(cTimer!=null)
cTimer.cancel();
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
public class PinTextWatcher implements TextWatcher {
private int currentIndex;
private boolean isFirst = false, isLast = false;
private String newTypedString = "";
PinTextWatcher(int currentIndex) {
this.currentIndex = currentIndex;
if (currentIndex == 0)
this.isFirst = true;
else if (currentIndex == editTexts.length - 1)
this.isLast = true;
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
newTypedString = s.subSequence(start, start count).toString().trim();
}
@Override
public void afterTextChanged(Editable s) {
String text = newTypedString;
/* Detect paste event and set first char */
if (text.length() > 1)
text = String.valueOf(text.charAt(0)); // TODO: We can fill out other EditTexts
editTexts[currentIndex].removeTextChangedListener(this);
editTexts[currentIndex].setText(text);
editTexts[currentIndex].setSelection(text.length());
editTexts[currentIndex].addTextChangedListener(this);
if (text.length() == 1)
moveToNext();
else if (text.length() == 0)
moveToPrevious();
}
private void moveToNext() {
if (!isLast)
editTexts[currentIndex 1].requestFocus();
if (isAllEditTextsFilled() && isLast) { // isLast is optional
editTexts[currentIndex].clearFocus();
hideKeyboard();
}
}
private void moveToPrevious() {
if (!isFirst)
editTexts[currentIndex - 1].requestFocus();
}
private boolean isAllEditTextsFilled() {
String str = "";
for (EditText editText : editTexts) {
str = editText.getText().toString().trim();
if (str.length() == 0)
return false;
}
test.setText(str);
msg.setText("Incorrect OTP, Please try again!");
return true;
}
private void hideKeyboard() {
if (getCurrentFocus() != null) {
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
}
}
}
public class PinOnKeyListener implements View.OnKeyListener {
private int currentIndex;
PinOnKeyListener(int currentIndex) {
this.currentIndex = currentIndex;
}
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DEL && event.getAction() == KeyEvent.ACTION_DOWN) {
if (editTexts[currentIndex].getText().toString().isEmpty() && currentIndex != 0)
editTexts[currentIndex - 1].requestFocus();
}
return false;
}
}
}
otp_activity.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:layout_width="match_parent"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_height="match_parent">
<TextView
android:id="@ id/header"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Enter the verification code"
android:layout_marginLeft="10dp"
android:textStyle="bold"
android:textAppearance="?android:attr/textAppearanceLargePopupMenu"/>
<TextView
android:id="@ id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="We have sent the OTP to "
android:layout_marginLeft="10dp"/>
<androidx.cardview.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@ id/card_view"
android:layout_width="180dp"
card_view:cardElevation="4dp"
android:gravity="center"
android:layout_height="60dp"
card_view:cardCornerRadius="4dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center">
<EditText
android:id="@ id/otpEdit1"
android:digits="1234567890"
android:inputType="number"
android:maxLength="1"
android:gravity="center"
android:layout_weight="1"
android:layout_width="2dp"
android:layout_height="wrap_content"
/>
<EditText
android:id="@ id/otpEdit2"
android:digits="1234567890"
android:inputType="number"
android:maxLength="1"
android:gravity="center"
android:layout_weight="1"
android:layout_width="2dp"
android:layout_height="wrap_content"
/>
<EditText
android:id="@ id/otpEdit3"
android:digits="1234567890"
android:inputType="number"
android:maxLength="1"
android:gravity="center"
android:layout_weight="1"
android:layout_width="2dp"
android:layout_height="wrap_content"
/>
<EditText
android:id="@ id/otpEdit4"
android:digits="1234567890"
android:inputType="number"
android:maxLength="1"
android:gravity="center"
android:layout_weight="1"
android:layout_width="2dp"
android:layout_height="wrap_content"
/>
<EditText
android:id="@ id/otpEdit5"
android:digits="1234567890"
android:inputType="number"
android:maxLength="1"
android:gravity="center"
android:layout_weight="1"
android:layout_width="2dp"
android:layout_height="wrap_content"
/>
<EditText
android:id="@ id/otpEdit6"
android:digits="1234567890"
android:inputType="number"
android:maxLength="1"
android:gravity="center"
android:layout_weight="1"
android:layout_width="2dp"
android:layout_height="wrap_content"
/>
</LinearLayout>
</androidx.cardview.widget.CardView>
<TextView
android:id="@ id/msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Waiting for OTP..."
android:layout_marginLeft="10dp"/>
<TextView
android:id="@ id/timer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Timer"
android:layout_marginLeft="10dp"/>
<Button
android:id="@ id/ResendOTP"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ResendOTP" />
<TextView
android:id="@ id/count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:layout_marginLeft="10dp"/>
<TextView
android:id="@ id/test"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:layout_marginLeft="10dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="500dp">
</LinearLayout>
</LinearLayout>
main_activity.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:background="@drawable/image">
<androidx.cardview.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@ id/card_view"
android:layout_width="330dp"
card_view:cardElevation="4dp"
android:layout_height="60dp"
card_view:cardCornerRadius="4dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center">
<Spinner
android:id="@ id/simpleSpinner"
android:layout_width="wrap_content"
android:layout_height="match_parent"
/>
<EditText
android:id="@ id/phNum"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:inputType="number"
android:maxLength="10"
android:hint="Enter phone number"
/>
</LinearLayout>
</androidx.cardview.widget.CardView>
<Button
android:id="@ id/buttonOTP"
android:layout_marginTop="20dp"
android:layout_width="330dp"
android:layout_height="wrap_content"
android:text="Send OTP" />
</LinearLayout>
CodePudding user response：
I have read your code and answer below, however it is not the right solution for this problem. I think you should write code like this:
Intent intent = new Intent(MainActivity.this, OTPActivity.class);
intent .putExtra(NUM,totalNumber);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(inte);
And in OTP Activity when you press back button just call:
@Override
public void onBackPressed() {
super.onBackPressed();
finish();
}
CodePudding user response：
Solved using this code in OTPActivity.java:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
//finish();
onBackPressed();
break;
}
return true;
}
@Override
public void onBackPressed() {
//Execute your code here
Intent inte = new Intent(OTPActivity.this,
MainActivity.class);
//inte.putExtra(NUM,totalNumber);
startActivity(inte);
finish();
}