Question

我有一个Activity，底部有四个按钮，就像标签一样。通过按任意按钮，新的片段将显示在这些按钮上方的FrameLayout中，就像我们在TabActivity中一样。请参阅我的问题here。现在我想我应该找到隐藏和显示这些片段的方法。请告诉我如何在不重新加载片段的情况下显示和隐藏片段。

主要显示隐藏片段的目的是保持其当前状态。在我的一个片段中，我有一个AsyncTask，每当我在片段之间切换时，它再次调用AsynTask。

Answer 1

//在隐藏时显示片段

FragmentManager fm = getSupportFragmentManager();
fm.beginTransaction()
          .show(fragment1)
          .commit();

//隐藏片段

FragmentManager fm = getSupportFragmentManager();
fm.beginTransaction()
          .hide(fragment1)
          .commit();

Answer 2

你无法通过像

这样的观点

声明4 frameLayout

private FrameLayout fragment1;
private FrameLayout fragment2;
private FrameLayout fragment3;
private FrameLayout fragment4;

和

FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.fragment1, Fragment1.newInstance());
ft.replace(R.id.fragment2, Fragment2.newInstance());
ft.replace(R.id.fragment3, Fragment3.newInstance());
ft.replace(R.id.fragment4, Fragment4.newInstance());
ft.commit();

玩可见还是消失了？喜欢

fragment1.setVisibility(View.Visible);
fragment2.setVisibility(View.gone);
fragment3.setVisibility(View.gone);
fragment4.setVisibility(View.gone);

顺便说一句：为我工作 - ＆gt; public class Activity扩展ActionBarActivity {

private FrameLayout fragment1;
private FrameLayout fragment2;

private Button bt1;
private Button bt2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.frg_test_frg);

    fragment1 = (FrameLayout) findViewById(R.id.fragment1);
    fragment2 = (FrameLayout) findViewById(R.id.fragment2);

    bt1 = (Button) findViewById(R.id.button);
    bt2 = (Button) findViewById(R.id.button2);

    bt1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            fragment1.setVisibility(View.VISIBLE);
            fragment2.setVisibility(View.GONE);
        }
    });

    bt2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            fragment1.setVisibility(View.GONE);
            fragment2.setVisibility(View.VISIBLE);
        }
    });

    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    ft.replace(R.id.fragment1, new Fragment1());
    ft.replace(R.id.fragment2, new Fragment2());
    ft.commit();
}

如何显示隐藏片段？

2 个答案: