I create an android app with viewpager
and fragment
s . I use two buttons on a fragment to go forward and backward . When I use the forward action , next fragment comes from right to left . It means fragments change from right to left in this action.
Here are my working code,
MainActivity.java
public class MainActivity extends FragmentActivity {
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager=(ViewPager)findViewById(R.id.viewPager);
viewPager.setAdapter(new MyPagerAdapter2(getSupportFragmentManager()));
viewPager.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (viewPager.getCurrentItem() == 0) {
return true;
}
if (viewPager.getCurrentItem() == 1) {
return true;
}
if (viewPager.getCurrentItem() == 2) {
return true;
}
if (viewPager.getCurrentItem() == 3) {
return true;
}
if (viewPager.getCurrentItem() == 4) {
return true;
}
return false;
}
});
}
private class MyPagerAdapter2 extends FragmentPagerAdapter {
public MyPagerAdapter2(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return FirstFragment1.newInstance("FirstFragment_1");
case 1: return SecondFragment1.newInstance("SecondFragment_1");
case 2: return ThirdFragment1.newInstance("ThirdFragment_1");
case 3: return FourthFragment1.newInstance("FourthFragment_1");
case 4: return FifthFragment1.newInstance("FifthFragment_1");
default: return FirstFragment1.newInstance("DefaultFragment_1");
}
}
@Override
public int getCount() {
return 5;
}
}
public void setCurrentItem(int which) {
if(viewPager != null && which >= 0 && which <= 4) {
viewPager.setCurrentItem(which);
}
}
}
FirstFragment1.java
public class FirstFragment1 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.first_frag_1, container, false);
TextView tv = (TextView) v.findViewById(R.id.tvFragFirst);
tv.setText(getArguments().getString("msg"));
Button button1=(Button)v.findViewById(R.id.nextButton);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (getActivity() != null) {
( (MainActivity)getActivity()).setCurrentItem(1); // fourth fragment index is 3
}
}
});
return v;
}
public static FirstFragment1 newInstance(String text) {
FirstFragment1 f = new FirstFragment1();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if(isVisibleToUser) {
Activity a = getActivity();
if(a != null) a.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
}
}
}
SecondFragment1.java
public class SecondFragment1 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.second_frag_1, container, false);
TextView tv = (TextView) v.findViewById(R.id.tvFragSecond);
tv.setText(getArguments().getString("msg"));
Button button=(Button)v.findViewById(R.id.printButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(getActivity() != null) {
( (MainActivity)getActivity()).setCurrentItem(0); // second fragment index is 1
}
}
});
Button button1=(Button)v.findViewById(R.id.nextButton);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (getActivity() != null) {
( (MainActivity)getActivity()).setCurrentItem(2); // fourth fragment index is 3
}
}
});
return v;
}
public static SecondFragment1 newInstance(String text) {
SecondFragment1 f = new SecondFragment1();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if(isVisibleToUser) {
Activity a = getActivity();
if(a != null) a.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
}
}
}
When I use the backward action , previous fragment comes from left to right. But it should be right to left and I have no idea how to do it.
eg :-
When I click on the button in SecondFragment1 , FirstFragment1 should come from right to left on the viewpager
. But currently it comes from left to right .
How could I achieve this ? Should I use an animation ?
Have any ideas ? Thank you.
I suggest you set your custom transitions:
enter from right:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false">
<translate
android:fromXDelta="100%" android:toXDelta="0%"
android:fromYDelta="0%" android:toYDelta="0%"
android:duration="500" />
</set>
exit to left:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false">
<translate
android:fromXDelta="0%" android:toXDelta="-100%"
android:fromYDelta="0%" android:toYDelta="0%"
android:duration="500"/>
</set>
enter from left:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false">
<translate
android:fromXDelta="-100%" android:toXDelta="0%"
android:fromYDelta="0%" android:toYDelta="0%"
android:duration="500"/>
</set>
exit to right:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false">
<translate
android:fromXDelta="0%" android:toXDelta="100%"
android:fromYDelta="0%" android:toYDelta="0%"
android:duration="500" />
</set>
and then you can set the transitions this way:
fragmentTransaction.setCustomAnimations(R.anim.from_right, R.anim.to_left);
Hope this helps you!
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