我是Android的新手,我尝试构建标签活动。这是我的主要活动:
public class MainActivity extends AppCompatActivity {
Toolbar toolbar;
TabLayout tabLayout;
ViewPager viewPager;
ViewPagerAdapter viewPagerAdapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolBar);
setSupportActionBar(toolbar);
tabLayout = (TabLayout) findViewById(R.id.tabLayout);
viewPager = (ViewPager) findViewById(R.id.viewPager);
viewPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
viewPagerAdapter.addFragments(new A(), "A");
viewPagerAdapter.addFragments(new B(), "B");
viewPagerAdapter.addFragments(new C(), "C");
viewPager.setAdapter(viewPagerAdapter);
tabLayout.setupWithViewPager(viewPager);
}
}
在活动片段A的开始时,已经构建了A和B,但是C正在等待单击C的标签。而且,当我从C更改选项卡时,A和B重新加载。如何在活动开始时加载所有片段?
使用setoff -screenpagelimit
在您的情况下:viewPager.setOffscreenPageLimit(2);