UPDATE
Hi, I tried to solve this issue so that it can be useful for future too. May be my attempt will not suit in each and every application requirement but it can be helpful in many situations. This is a demo I tried using fragments and I assume this is the only possible way to achieve this requirement. Correct me if I am wrong anywhere. Here is the code:
MainActivity.java
public class MainActivity extends AppCompatActivity {
private Fragment mCurrentFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addFragment(MainFragment.newInstance());
}
public void replaceFragment(Fragment fragment) {
FragmentManager fragmentManager = getSupportFragmentManager();
String backStackTag = fragment.getClass().getName();
boolean fragmentPoped = fragmentManager.popBackStackImmediate(backStackTag, 0);
if (!fragmentPoped) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame, fragment, backStackTag);
if (backStackTag != null) {
fragmentTransaction.addToBackStack(backStackTag);
}
fragmentTransaction.commitAllowingStateLoss();
}
}
public void addFragment(Fragment fragment) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
if (mCurrentFragment != null) {
Fragment f = getSupportFragmentManager().findFragmentByTag(mCurrentFragment.getClass().getName());
if (f != null) {
fragmentTransaction.remove(f);
}
}
fragmentTransaction.add(R.id.frame, fragment, fragment.getClass().getName());
fragmentTransaction.commit();
mCurrentFragment = fragment;
}
public void replaceInMainFragment(Fragment fragment) {
if (mCurrentFragment != null && mCurrentFragment instanceof MainFragment) {
((MainFragment) mCurrentFragment).replaceFragment(fragment);
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/frame"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
</RelativeLayout>
MainFragment.java
public class MainFragment extends Fragment {
private View mView;
private Fragment mCurrentFragment;
public static MainFragment newInstance() {
MainFragment loginFragment = new MainFragment();
return loginFragment;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
mView = inflater.inflate(R.layout.fragment_main, container, false);
Log.e("MainFragment", "onCreateView");
return mView;
}
@Override
public void onStart() {
super.onStart();
Log.e("MainFragment", "onStart");
addFragment(LoginFragment.newInstance());
}
public void replaceFragment(Fragment fragment) {
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
String backStackTag = fragment.getClass().getName();
boolean fragmentPoped = fragmentManager.popBackStackImmediate(backStackTag, 0);
if (!fragmentPoped) {
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame_main, fragment, backStackTag);
if (backStackTag != null) {
fragmentTransaction.addToBackStack(backStackTag);
}
fragmentTransaction.commitAllowingStateLoss();
}
}
public void addFragment(Fragment fragment) {
removeAllFragmentFromBackstack();
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
if (mCurrentFragment != null) {
Fragment f = getActivity().getSupportFragmentManager().findFragmentByTag(mCurrentFragment.getClass().getName());
if (f != null) {
fragmentTransaction.remove(f);
}
}
fragmentTransaction.add(R.id.frame_main, fragment, fragment.getClass().getName());
fragmentTransaction.commit();
mCurrentFragment = fragment;
}
private void removeAllFragmentFromBackstack() {
FragmentManager fm = getActivity().getSupportFragmentManager();
for (int i = 0; i < fm.getBackStackEntryCount(); ++i) {
fm.popBackStack();
}
}
}
fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/frame_main"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
</RelativeLayout>
LoginFragment.java
public class LoginFragment extends Fragment {
private View mView;
public static LoginFragment newInstance() {
LoginFragment loginFragment = new LoginFragment();
return loginFragment;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
mView = inflater.inflate(R.layout.fragment_login, container, false);
Log.e("LoginFragment", "onCreateView");
mView.findViewById(R.id.btnLogin).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
((MainActivity) getActivity()).replaceInMainFragment(Fragment1.newInstance());
}
});
return mView;
}
}
fragment_login.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/btnLogin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Login" />
</RelativeLayout>
Fragment1.java
public class Fragment1 extends Fragment {
private View mView;
public static Fragment1 newInstance() {
Fragment1 fragment1 = new Fragment1();
return fragment1;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
mView = inflater.inflate(R.layout.fragment_1, container, false);
mView.findViewById(R.id.btnFrag1).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
((MainActivity) getActivity()).replaceInMainFragment(Fragment2.newInstance());
}
});
return mView;
}
}
fragment_1.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/btnFrag1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="This is Fragment 1" />
</RelativeLayout>
Fragment2.java
public class Fragment2 extends Fragment {
private View mView;
public static Fragment2 newInstance() {
Fragment2 fragment1 = new Fragment2();
return fragment1;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
mView = inflater.inflate(R.layout.fragment_2, container, false);
mView.findViewById(R.id.btnFrag2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
return mView;
}
}
fragment_2.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/btnFrag2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="This is fragment 2" />
</RelativeLayout>
Hope it helps someone.
OLD
Then I think you need some hack. It will not directly accessible. Try calling 2nd activity when user press back button or any other option to go to the 2nd activity from 3rd activity. Hope it suits your app's requirement.
ThirdActivity.java
public class ThirdActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
}
@Override
public void onBackPressed() {
super.onBackPressed();
startActivity(new Intent(getBaseContext(), SecondActivity.class));
}
}
SecondActivity.java
public class SecondActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
findViewById(R.id.btnJumpToThirdScreen).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(getBaseContext(), ThirdActivity.class));
}
});
}
}
OLD
Here is the demo I made just now. For this you need to define android:noHistory="true" in your manifest. Here is the sample code:
MainActivity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btnJump).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(getBaseContext(), SecondActivity.class));
}
});
}
}
SecondActivity.java
public class SecondActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
}
}
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ccc.stackoverflow">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".SecondActivity"
android:noHistory="true"></activity>
</application>
</manifest>
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/btnJump"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="My Launcher Activity Main" />
</RelativeLayout>
Try this demo. Also check removing noHistory flag from your Manifest. You can see the difference. Hope it helps you.
