Android 4.0.x和4.1.x viewPager错误? [英] Android 4.0.x and 4.1.x viewPager bug?
问题描述
我在android API 15和16上使用viewPager时遇到问题，我的应用程序si基本上是用于具有三个屏幕的机顶盒的简单遥控器，在第一个屏幕上您可以选择要控制的盒子，第二个和第三个只是带有控件的屏幕.现在的问题是，一切都可以在其他版本的android上正常运行，但是在API 15和16上，当应用启动时，我无法使用带有框的creen，当我点击它可以检测到第二个屏幕上作为控件的动作时， ，当我滑动到第三个屏幕然后返回时，再次调用第一个屏幕的onCreateView，一切运行正常.这是第一屏幕和第二屏幕的图像 这是我的viewPager代码:
i have a problem with viewPager on android API 15 and 16, my app si basically simple remote control for set top boxes with three screens where on the first screen you can choose which box you want to control, second and third are just screens with controls. Now the problem is that everything works pefectly on every other version of android, but on API 15 and 16, when the app starts, i can not uses the creen with boxes, when i tap anywhere it detects actions on the second screen which are controls, when i swipe to third screen and then back, onCreateView for first screen is called again and everything works perfectly. Here are images of first and second screens and here is my code for viewPager:
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
switch (position) {
case 0:
return boxesFragment;
case 1:
return miscpadFragment;
case 2:
if (metrics.densityDpi == DisplayMetrics.DENSITY_MEDIUM) {
return volPadFragment;
} else return numberPadFragment;
case 3:
return numberPadFragment;
}
return null;
}
@Override
public int getCount() {
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
switch(metrics.densityDpi){
case DisplayMetrics.DENSITY_MEDIUM:
if (isTablet) {
return 2;
} else return 4;
case DisplayMetrics.DENSITY_HIGH:
if (isTablet) {
return 2;
} else return 3;
case DisplayMetrics.DENSITY_XHIGH:
if (isTablet) {
return 2;
} else return 3;
case DisplayMetrics.DENSITY_XXHIGH:
return 3;
case DisplayMetrics.DENSITY_TV:
return 2;
}
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
和我也用于动画制作的DepthPageTransformer:
and DepthPageTransformer which i am also using for animation:
public class DepthPageTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.8f;
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 0) { // [-1,0]
// Use the default slide transition when moving to the left page
view.setAlpha(1);
view.setTranslationX(0);
view.setScaleX(1);
view.setScaleY(1);
} else if (position <= 1) { // (0,1]
// Fade the page out.
view.setAlpha(1 - position);
// Counteract the default slide transition
view.setTranslationX(pageWidth * -position);
// Scale the page down (between MIN_SCALE and 1)
float scaleFactor = MIN_SCALE
+ (1 - MIN_SCALE) * (1 - Math.abs(position));
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
推荐答案
所以我解决了我的问题，这是我从developer.google.com下载的DepthPageTransformer中的transformPage方法，我对此进行了如下修改:
so i resolved my problem, it was transformPage method in DepthPageTransformer wich i downloaded from developers.google.com i modified it like this:
public void transformPage(View view, float position) {
float translationX;
float scale;
float alpha;
if (position >= 1 || position <= -1) {
// Fix for https://code.google.com/p/android/issues/detail?id=58918
translationX = 0;
scale = 1;
alpha = 1;
} else if (position >= 0) {
translationX = -view.getWidth() * position;
scale = -0.2f * position + 1;
alpha = Math.max(1 - position, 0);
} else {
translationX = 0.5f * view.getWidth() * position;
scale = 1.0f;
alpha = Math.max(0.1f * position + 1, 0);
}
view.setTranslationX( translationX);
view.setScaleX(scale);
view.setScaleY(scale);
view.setAlpha(alpha);
}
一切正常.
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