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Add simple animation while swiping through screenshots

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This commit is contained in:
Christine Emrich 2017-11-08 13:18:15 +01:00
parent e38d02a59c
commit 1d51385fc6
1 changed files with 33 additions and 0 deletions
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33
app/src/main/java/org/fdroid/fdroid/views/ScreenShotsActivity.java
View File

@ -1,8 +1,10 @@
package org.fdroid.fdroid.views;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
@ -53,6 +55,11 @@ public class ScreenShotsActivity extends AppCompatActivity {
ScreenShotPagerAdapter adapter = new ScreenShotPagerAdapter(getSupportFragmentManager(), screenshots);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(startPosition);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// display some nice animation while swiping
viewPager.setPageTransformer(true, new DepthPageTransformer());
}
}
@ -123,4 +130,30 @@ public class ScreenShotsActivity extends AppCompatActivity {
return rootView;
}
}
@TargetApi(11)
public class DepthPageTransformer implements ViewPager.PageTransformer {
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
if (position <= 0) {
// use the default slide transition when moving to the left page
view.setAlpha(1);
view.setTranslationX(0);
} else if (position <= 1) {
// fade the page out.
view.setAlpha(1 - position);
// add parallax effect
view.setTranslationX(pageWidth * -position / 2);
} else {
// this page is way off-screen to the right.
view.setAlpha(0);
}
}
}
}