Counting number of times android app goes into background - android-layout

Question

I'm developing an app which counts number of times the app goes to the background. It also retains the values when the orientation is changed. Though I have it working of all use cases, I have one use case which does not work.
Case : When I press the home button, change the phone's orientation and reopen the app, It does open in landscape mode but, the background count does not increase.
I have tried setting values in all the life cycle methods. It doesn't work. Hope somebody can help me with this.
`
public class MainActivity extends AppCompatActivity {
private int clickCount =0, backgroundCount = 0;
TextView tvClickCountValue, tvBackgroundCountValue;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if( savedInstanceState != null){
clickCount = savedInstanceState.getInt("COUNT");
backgroundCount = savedInstanceState.getInt("BGCOUNT");
}
setContentView(R.layout.activity_main);
tvClickCountValue = (TextView) this.findViewById(R.id.tvClickCountValue);
tvBackgroundCountValue = (TextView) this.findViewById(R.id.tvBackgroundCountValue);
setView(MainActivity.this);
}
public void onClick(View v){
clickCount += 1;
tvClickCountValue.setText(Integer.toString(clickCount));
}
public void setView(Context ctx){
tvClickCountValue.setText(Integer.toString(clickCount));
tvBackgroundCountValue.setText(Integer.toString(backgroundCount));
}
#Override
protected void onStop() {
super.onStop();
backgroundCount += 1;
}
#Override
protected void onResume() {
super.onResume();
tvClickCountValue.setText(Integer.toString(clickCount));
tvBackgroundCountValue.setText(Integer.toString(backgroundCount));
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("COUNT", clickCount);
outState.putInt("BGCOUNT", backgroundCount);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
clickCount = savedInstanceState.getInt("COUNT");
backgroundCount = savedInstanceState.getInt("BGCOUNT");
}
}

Answer 1

This article contains useful information: https://developer.android.com/guide/topics/resources/runtime-changes.html especially in the section about Handling The Change.
Try handling it on onConfigurationChanged() of you have disabled Activity restarts on orientation changes. Otherwise, probably through this article you will find which case applies to your scenario.
By reading the problem description, I am assuming that if you don't rotate the device the application works as intended.

Answer 2

you need to persist the count in the SharedPreferences. each time you reopen the app read the last value from the SharedPreferences. And increment and save to SharedPreferences each time the app is hidden.
Then you can count the with #kiran code:
public class BaseActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
public static boolean isAppInFg = false;
public static boolean isScrInFg = false;
public static boolean isChangeScrFg = false;
#Override
protected void onStart() {
if (!isAppInFg) {
isAppInFg = true;
isChangeScrFg = false;
onAppStart();
}
else {
isChangeScrFg = true;
}
isScrInFg = true;
super.onStart();
}
#Override
protected void onStop() {
super.onStop();
if (!isScrInFg || !isChangeScrFg) {
isAppInFg = false;
onAppPause();
}
isScrInFg = false;
}
public void onAppStart() {
// app in the foreground
// show the count here.
}
public void onAppPause() {
// app in the background
// start counting here.
}
}