Update FragmentPagerAdapter to FragmentStatePagetAdapter

Author: ClusterPleiades

app/src/main/ic_graphic-playstore.png

@@ -12,7 +12,7 @@
 import androidx.appcompat.widget.Toolbar;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
-import androidx.fragment.app.FragmentPagerAdapter;
+import androidx.fragment.app.FragmentStatePagerAdapter;
 import androidx.viewpager.widget.ViewPager;
 
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
@@ -21,9 +21,11 @@
 import com.pleiades.pleione.base64.ui.SettingsActivity;
 
 import org.apache.commons.codec.binary.Base64;
-import org.jetbrains.annotations.NotNull;
+
+import static androidx.fragment.app.FragmentStatePagerAdapter.BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT;
 
 public class MainActivity extends AppCompatActivity {
+    SectionsPagerAdapter sectionsPagerAdapter;
     ViewPager viewPager;
 
     String externalInput;
@@ -38,21 +40,18 @@ protected void onCreate(Bundle savedInstanceState) {
         Toolbar toolbar = appbar.findViewById(R.id.toolbar_main);
         setSupportActionBar(toolbar);
 
-        SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
+        sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager(), BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
         viewPager = findViewById(R.id.pager);
         viewPager.setAdapter(sectionsPagerAdapter);
         TabLayout tabs = findViewById(R.id.layout_tab);
         tabs.setupWithViewPager(viewPager);
         FloatingActionButton fab = findViewById(R.id.fab);
 
-        fab.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View view) {
-                int index = viewPager.getCurrentItem();
-                PlaceholderFragment fragment = (PlaceholderFragment) sectionsPagerAdapter.instantiateItem(viewPager, index);
+        fab.setOnClickListener(view -> {
+            int index = viewPager.getCurrentItem();
+            PlaceholderFragment fragment = (PlaceholderFragment) sectionsPagerAdapter.instantiateItem(viewPager, index);
 
-                fragment.convert();
-            }
+            fragment.convert();
         });
     }
 
@@ -66,7 +65,8 @@ protected void onResume() {
             if (intent.getAction().equals(Intent.ACTION_PROCESS_TEXT) && intent.hasExtra(Intent.EXTRA_PROCESS_TEXT)) {
                 externalInput = intent.getStringExtra(Intent.EXTRA_PROCESS_TEXT);
                 isExternalInputBase64 = Base64.isBase64(externalInput);
-                viewPager.setCurrentItem(isExternalInputBase64 ? 1 : 0);
+                int index = isExternalInputBase64 ? 1 : 0;
+                viewPager.setCurrentItem(index);
             }
         }
     }
@@ -88,14 +88,13 @@ public boolean onOptionsItemSelected(@NonNull MenuItem item) {
         return super.onOptionsItemSelected(item);
     }
 
-    class SectionsPagerAdapter extends FragmentPagerAdapter {
+    private class SectionsPagerAdapter extends FragmentStatePagerAdapter{
 
-        // constructor
-        public SectionsPagerAdapter(FragmentManager fm) {
-            super(fm, FragmentPagerAdapter.BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
+        public SectionsPagerAdapter(@NonNull FragmentManager fm, int behavior) {
+            super(fm, behavior);
         }
 
-        @NotNull
+        @NonNull
         @Override
         public Fragment getItem(int position) {
             if (externalInput != null)
@@ -118,4 +117,35 @@ public int getCount() {
             return 2;
         }
     }
+
+//    private class SectionsPagerAdapter extends FragmentPagerAdapter {
+//
+//        // constructor
+//        public SectionsPagerAdapter(FragmentManager fm) {
+//            super(fm, FragmentPagerAdapter.BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
+//        }
+//
+//        @NotNull
+//        @Override
+//        public Fragment getItem(int position) {
+//            if (externalInput != null)
+//                if ((position == 0 && !isExternalInputBase64) || position == 1 && isExternalInputBase64) {
+//                    Fragment fragment = PlaceholderFragment.newInstance(position, externalInput);
+//                    externalInput = null;
+//                    return fragment;
+//                }
+//            return PlaceholderFragment.newInstance(position, null);
+//        }
+//
+//        @Nullable
+//        @Override
+//        public CharSequence getPageTitle(int position) {
+//            return position == 0 ? "ENCODE" : "DECODE";
+//        }
+//
+//        @Override
+//        public int getCount() {
+//            return 2;
+//        }
+//    }
 }

app/src/main/image.pptx

@@ -13,9 +13,7 @@
 import android.widget.EditText;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
-import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModelProvider;
 
 import com.pleiades.pleione.base64.R;
@@ -65,26 +63,11 @@ public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
         View root = inflater.inflate(R.layout.fragment_main, container, false);
 
         inputEditText = root.findViewById(R.id.input);
-        pageViewModel.getHint().observe(this, new Observer<String>() {
-            @Override
-            public void onChanged(@Nullable String s) {
-                inputEditText.setHint(s);
-            }
-        });
-        pageViewModel.getExternalInput().observe(this, new Observer<String>() {
-            @Override
-            public void onChanged(String s) {
-                inputEditText.setText(s);
-            }
-        });
+        pageViewModel.getHint().observe(this, s -> inputEditText.setHint(s));
+        pageViewModel.getExternalInput().observe(this, s -> inputEditText.setText(s));
 
         outputEditText = root.findViewById(R.id.output);
-        pageViewModel.getOutput().observe(this, new Observer<String>() {
-            @Override
-            public void onChanged(String s) {
-                outputEditText.setText(s);
-            }
-        });
+        pageViewModel.getOutput().observe(this, s -> outputEditText.setText(s));
 
         return root;
     }