Feature/init sample

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 25
+    buildToolsVersion "25.0.0"
+    defaultConfig {
+        applicationId "sk.inloop.support"
+        minSdkVersion 15
+        targetSdkVersion 25
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    compile 'com.android.support:appcompat-v7:25.0.1'
+    testCompile 'junit:junit:4.12'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/adammihalik/Library/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}

app/src/androidTest/java/sk/inloop/support/sample/ExampleInstrumentedTest.java

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+package sk.inloop.support.sample;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("sk.inloop.support.sample", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="sk.inloop.support.sample">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity
+            android:name=".IncorrectMainActivity"
+            android:label="@string/fail_activity_name"
+            android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".FixedMainActivity"
+            android:label="@string/fixed_activity_name"
+            android:theme="@style/AppTheme.NoActionBar">
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/sk/inloop/support/sample/FixedMainActivity.java

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+package sk.inloop.support.sample;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v4.view.ViewPager;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.Menu;
+import android.view.View;
+import android.widget.Button;
+
+import sk.inloop.support.sample.adapter.CorrectFragmentAdapter;
+
+public class FixedMainActivity extends AppCompatActivity {
+
+    private CorrectFragmentAdapter mSectionsPagerAdapter;
+
+    private ViewPager mViewPager;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
+        setSupportActionBar(myToolbar);
+
+        mSectionsPagerAdapter = new CorrectFragmentAdapter(getSupportFragmentManager());
+
+        mViewPager = (ViewPager) findViewById(R.id.container);
+        mViewPager.setAdapter(mSectionsPagerAdapter);
+
+        ((Button)findViewById(R.id.test_start_btn)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mSectionsPagerAdapter.toggleState();
+            }
+        });
+
+        ((Button)findViewById(R.id.switch_tests_btn)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(FixedMainActivity.this, IncorrectMainActivity.class);
+                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                FixedMainActivity.this.startActivity(intent);
+            }
+        });
+    }
+
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        return true;
+    }
+
+}

app/src/main/java/sk/inloop/support/sample/IncorrectMainActivity.java

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+package sk.inloop.support.sample;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v4.view.ViewPager;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.Menu;
+import android.view.View;
+import android.widget.Button;
+
+import sk.inloop.support.sample.adapter.IncorrectFragmentAdapter;
+
+public class IncorrectMainActivity extends AppCompatActivity {
+
+    private IncorrectFragmentAdapter mSectionsPagerAdapter;
+
+    private ViewPager mViewPager;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
+        setSupportActionBar(myToolbar);
+
+        mSectionsPagerAdapter = new IncorrectFragmentAdapter(getSupportFragmentManager());
+
+        mViewPager = (ViewPager) findViewById(R.id.container);
+        mViewPager.setAdapter(mSectionsPagerAdapter);
+
+        ((Button)findViewById(R.id.test_start_btn)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mSectionsPagerAdapter.toggleState();
+            }
+        });
+
+        ((Button)findViewById(R.id.switch_tests_btn)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(IncorrectMainActivity.this, FixedMainActivity.class);
+                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                IncorrectMainActivity.this.startActivity(intent);
+            }
+        });
+    }
+
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        return true;
+    }
+
+}

app/src/main/java/sk/inloop/support/sample/SampleFragment.java

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+package sk.inloop.support.sample;
+
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+/**
+ * Created by adammihalik on 05/12/2016.
+ */
+
+public class SampleFragment extends Fragment {
+    public static SampleFragment newInstance(String label) {
+        Bundle bundle = new Bundle();
+        bundle.putString("label", label);
+        SampleFragment testFragment = new SampleFragment();
+        testFragment.setArguments(bundle);
+        return testFragment;
+    }
+
+    public String getLabel() {
+        return getArguments().getString("label");
+    }
+
+    @Nullable
+    @Override
+    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.fragment_template, container, false);
+    }
+
+    @Override
+    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
+        ((TextView)view.findViewById(R.id.fragment_label)).setText(getLabel());
+    }
+}

app/src/main/java/sk/inloop/support/sample/adapter/CorrectFragmentAdapter.java

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+package sk.inloop.support.sample.adapter;
+
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+
+import sk.inloop.support.sample.SampleFragment;
+import sk.inloop.support.v4.app.FragmentStatePagerAdapter;
+
+/**
+ * Extends {@link sk.inloop.support.v4.app.FragmentStatePagerAdapter}, therefore {@link #notifyDataSetChanged()} will not fail.
+ */
+public class CorrectFragmentAdapter extends FragmentStatePagerAdapter {
+
+    private boolean mState = true;
+
+    public CorrectFragmentAdapter(FragmentManager fragmentManager) {
+        super(fragmentManager);
+    }
+
+    @Override
+    public int getCount() {
+        return 3;
+    }
+
+    public void toggleState() {
+        mState = !mState;
+        notifyDataSetChanged();
+    }
+
+    private String getLabel(int position) {
+        switch (position) {
+            case 0:
+                return "A";
+            case 1:
+                return mState ? "B" : "C";
+            default:
+                return mState ? "C" : "B";
+        }
+    }
+
+    @Override
+    public int getItemPosition(Object object) {
+        String label = ((SampleFragment) object).getLabel();
+        if (label.equals("A")) {
+            return 0;
+        } else if (label.equals("B")) {
+            return mState ? 1 : 2;
+        } else {
+            return mState ? 2 : 1;
+        }
+    }
+
+    @Override
+    public CharSequence getPageTitle(int position) {
+        return getLabel(position);
+    }
+
+    @Override
+    public Fragment getItem(int position) {
+        return SampleFragment.newInstance(getLabel(position));
+    }
+}