I have an FragmentActivity holding a entry button and a viewpager.
When the entry button clicked, it will set an image url to a new FragmentPagerAdapter and set the adapter to viewpager.
And the FragmentPagerAdpater is holding fragment that shows an image.
Then press back button, and click that entry button again.
It will set a new image url to a new FragmentPagerAdapter and set the adapter to viewpager.
My problem is the fragment keep showing the first image, but not show other image when entry button is clicked. It seems some stuffs can't update.
What would be the problem?
TestGallery.java
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.season.test.TestGalleryFragment;
import java.util.ArrayList;
public class TestGallery extends FragmentActivity {
private ArrayList<Integer> imgURLs;
private GalleryPagerAdapter mAdapter;
private Button btnEntry;
private ViewPager viewPager;
private int curr = 0;
private int[] resourceIDs = {R.drawable.abc_btn_check_material, R.drawable.abc_ic_go_search_api_mtrl_alpha, R.drawable.ic_launcher};
@Override
public void onBackPressed() {
if (viewPager.getVisibility() == View.VISIBLE) {
btnEntry.setVisibility(View.VISIBLE);
viewPager.setVisibility(View.GONE);
} else {
super.onBackPressed();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_gallery);
btnEntry = (Button) findViewById(R.id.btnEntry);
viewPager = (ViewPager) findViewById(R.id.viewPager);
btnEntry.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (curr >= resourceIDs.length) {
curr = 0;
}
if (imgURLs == null) {
imgURLs = new ArrayList<>();
}
imgURLs.clear();
imgURLs.add(resourceIDs[curr]);
if (mAdapter == null) {
mAdapter = new GalleryPagerAdapter(getSupportFragmentManager(), imgURLs);
viewPager.setAdapter(mAdapter);
}
mAdapter.notifyDataSetChanged();
btnEntry.setVisibility(View.GONE);
viewPager.setVisibility(View.VISIBLE);
curr++;
btnEntry.setText("Click For Next Image: " + curr % resourceIDs.length);
Toast.makeText(TestGallery.this,"Press Back Button",Toast.LENGTH_SHORT).show();
}
});
}
class GalleryPagerAdapter extends FragmentPagerAdapter {
ArrayList<Integer> imgURLs;
GalleryPagerAdapter(FragmentManager fm, ArrayList<Integer> imgURLs) {
super(fm);
this.imgURLs = imgURLs;
}
@Override
public Fragment getItem(int position) {
return TestGalleryFragment.newInstance(imgURLs.get(position));
}
@Override
public int getCount() {
return imgURLs.size();
}
}
}
activity_test_gallery.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/layoutDetails">
<Button
android:id="@+id/btnEntry"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Click to show next"
android:textSize="30sp"
/>
<android.support.v4.view.ViewPager
android:background="#0000"
android:id="@+id/viewPager"
android:visibility="gone"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
</FrameLayout>
TestGalleryFragment.java
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.season.test.R;
public class TestGalleryFragment extends Fragment {
public static String KEY_IMG_URL = "imgURL";
private Integer imgURL = R.drawable.ic_launcher;
public static TestGalleryFragment newInstance(Integer imgURL) {
Log.i("url", "frag url: " + imgURL);
TestGalleryFragment fragment = new TestGalleryFragment();
Bundle args = new Bundle();
args.putInt(KEY_IMG_URL, imgURL);
fragment.setArguments(args);
return fragment;
}
public TestGalleryFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
imgURL = getArguments().getInt(KEY_IMG_URL);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View root = inflater.inflate(R.layout.fragment_gallery, container, false);
ImageView imgPhoto = (ImageView) root.findViewById(R.id.imgPhoto);
imgPhoto.setImageResource(imgURL);
return root;
}
}
fragment_test_gallery.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0000">
<ImageView
android:id="@+id/imgPhoto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center" />
</FrameLayout>
