viewPager.setAdapter(new MyFragmentPagerAdapter(getSupportFragmentManager()
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Null Pointer Exeception on viewPager.setAdapter(new MyFragmentPagerAdapter(getSupportFragmentManager()，alFragment));
viewPager未初始化
you can debug a NullPointerException yourself by adding things like:
if(viewPager == null){ Log.e("MainActivity", "viewPager should not be null"); } 0 0
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