Android application retain the state after the app is restored from minimize

Issue

I have an app which starts from a splash screen and then navigates to other activities. If i press the home button in a particular activity ,the app gets minimized. Again if i click on the app icon, the app starts from the splash screen. I want to resume my app from the activity in which the home button was pressed. How to achieve this?

   package com.xyz.user.login;

  import android.app.Activity;
  import android.app.AlertDialog;
  import android.content.DialogInterface;
  import android.content.Intent;
  import android.os.Bundle;
  import android.view.Menu;
  import android.view.MenuInflater;
  import android.view.MenuItem;
  import android.view.View;
  import android.widget.ImageButton;

  public class ResetPasswordActivity extends Activity {
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // TODO Auto-generated method stub
    MenuInflater menuInflater  getMenuInflater();
    menuInflater.inflate(R.layout.menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.logout:
        // Single menu item is selected do something
        // Ex: launching new activity/screen or show alert message
        PopIt("Are you sure you want to exit?");
        return true;

    default:
        return super.onOptionsItemSelected(item);
    }
}

private void PopIt(String string) {
    AlertDialog.Builder builder  new AlertDialog.Builder(this);
    builder.setMessage(string)
            .setCancelable(false)
            .setPositiveButton("Yes",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            Intent intent  new Intent(
                                    getApplicationContext(),
                                    SignInActivity.class);
                            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                            intent.putExtra("EXIT", true);
                            startActivity(intent);
                        }
                    })
            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                }
            });
    AlertDialog alert  builder.create();
    alert.show();

}

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.reset_password);
     ImageButton imgRPass(ImageButton)findViewById(R.id.imgChangePass);
     imgRPass.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
        Intent intentnew Intent(ResetPasswordActivity.this,ResetPasswordMessageActivity.class);
        startActivity(intent);
        }
    });
     ImageButton imgBack(ImageButton)findViewById(R.id.imgbtnBackFromResetPass);
     imgBack.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
            finish();
            }
        });
}

}

Solution

Maybe the code in your Activities has a call to finish() in onStop() or onPause(). That destroys the Activity when it’s minimised and causes the app to start again. There are other steps to take to be sure of restoring the state, but that is a good place to start looking.

You could try putting this code in there to track what is going on.

private static final String TAG  "ResetPasswordActivity";
@Override public void onStart() {
    Log.d(TAG, "onStart:");
    super.onStart();
}  
@Override public void onResume() {
    Log.d(TAG, "onResume:");
    super.onResume();
}
@Override public void onPause() {
    Log.d(TAG, "onPause:");
    super.onPause();
}
@Override public void onStop() {
    Log.d(TAG, "onStop:");
    super.onStop();
}
@Override public void onDestroy() {
    Log.d(TAG, "onDestroy:");
    super.onDestroy();
}

There are calls to finish and startActivity in there, although I cannot see why they should be executed. I’d put a Log statement by each. Then try it again and see what the Logcat output says when you minimise and relaunch the app.

Answered By – emrys57