Java Code Examples for android.support.v4.app.Fragment#isAdded()

/**
 * 添加或者显示 fragment
 *
 * @param transaction
 * @param fragment
 */
private void addOrShowFragment(FragmentTransaction transaction, Fragment fragment) {
    transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    //设置动画
    transaction.setCustomAnimations(
            R.anim.right_in,
            R.anim.right_out);
    //当前的fragment就是点击切换的目标fragment，则不用操作
    if (currentFragment == fragment) {
        return;
    }

    Fragment willCloseFragment = currentFragment;//上一个要切换掉的碎片
    currentFragment = fragment;//当前要显示的碎片

    if (willCloseFragment != null) {
        transaction.hide(willCloseFragment);
    }
    if (!fragment.isAdded()) { // 如果当前fragment未被添加，则添加到Fragment管理器中
        transaction.add(R.id.fl_main_body, currentFragment).commitAllowingStateLoss();
    } else {
        transaction.show(currentFragment).commitAllowingStateLoss();
    }
}
 

protected void showFragment(int containerId, Fragment from, Fragment to, String tag) {
    FragmentManager supportFragmentManager = getSupportFragmentManager();
    FragmentTransaction transaction = supportFragmentManager.beginTransaction();
    if (!to.isAdded()) {    // 先判断是否被add过
        if (tag != null) {
            transaction.hide(from).add(containerId, to, tag);
        } else {
            transaction.hide(from).add(containerId, to);
        }

        // 隐藏当前的fragment，add下一个到Activity中
    } else {
        transaction.hide(from).show(to); // 隐藏当前的fragment，显示下一个
    }
    transaction.commit();

}
 

/**
 * 切换fragment
 *
 * @param from            需要隐藏的fragment
 * @param currentFragment 当前需要显示的fragment
 */
private void switchFragment(Fragment from, Fragment currentFragment) {
    // 不是重复点击才切换
    if (mPreviousFragment != currentFragment) {
        mPreviousFragment = currentFragment;

        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        if (from != null) {
            transaction.hide(from);
        }
        if (currentFragment.isAdded()) {
            transaction.show(currentFragment);
        } else {
            transaction.add(R.id.fl_main_content, currentFragment);
        }
        transaction.commit();
    }
}
 

public void addOption(Options options) {
    FragmentManager fragmentManager = ((AppCompatActivity) context).getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left);
    Fragment fragment;
    fragment = ((BaseActivity) context).mSupportFragmentManager.findFragmentByTag(AddOptionFragment.class.getSimpleName());
    if (fragment == null)
        fragment = new AddOptionFragment();
    if (!fragment.isAdded()) {
        Bundle bundle = new Bundle();
        bundle.putSerializable("options", options);
        bundle.putBoolean("IS_EDIT", false);
        fragment.setArguments(bundle);
        fragmentTransaction.add(((OptionsActivity) context).binding.optionFl.getId(), fragment, fragment.getClass().getSimpleName());
        fragmentTransaction.addToBackStack(fragment.getClass().getSimpleName()).commit();
    }
}
 

public void onClickCategory(Category category) {
    FragmentManager fragmentManager = ((AppCompatActivity) context).getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left);
    Fragment fragment;
    fragment = ((BaseActivity) context).mSupportFragmentManager.findFragmentByTag(AddCategoryFragment.class.getSimpleName());
    if (fragment == null)
        fragment = new AddCategoryFragment();
    if (!fragment.isAdded()) {
        Bundle bundle = new Bundle();
        bundle.putSerializable("category", category);
        bundle.putBoolean("edit", true);
        fragment.setArguments(bundle);
        Log.d("name", fragment.getClass().getSimpleName() + "");
        fragmentTransaction.add(((CategoryActivity) context).binding.categoryFl.getId(), fragment, fragment.getClass().getSimpleName());
        fragmentTransaction.addToBackStack(fragment.getClass().getSimpleName()).commit();
    }
}
 

public void editTaxRate(Tax tax) {
    FragmentManager fragmentManager = ((AppCompatActivity) context).getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left);
    Fragment fragment;
    fragment = ((BaseActivity) context).mSupportFragmentManager.findFragmentByTag(AddTaxFragment.class.getSimpleName());
    if (fragment == null)
        fragment = new AddTaxFragment();
    if (!fragment.isAdded()) {
        Bundle bundle = new Bundle();
        bundle.putSerializable("tax", tax);
        bundle.putBoolean("edit", true);
        fragment.setArguments(bundle);
        fragmentTransaction.add(((TaxActivity) context).binding.taxFl.getId(), fragment, fragment.getClass().getSimpleName());
        fragmentTransaction.addToBackStack(fragment.getClass().getSimpleName()).commit();
    }
}
 

@Override
public void showFragment(@NonNull Fragment fragment, @IdRes int containerViewId, boolean showRepeatAnim) {
    String fragmentTAG = Rigger.getRigger(fragment).getFragmentTAG();
    if (mStackManager.add(fragmentTAG, containerViewId)) {
        addFragmentWithAnim(fragment, containerViewId);
    }
    String[] fragmentTags = mStackManager.getFragmentTags(containerViewId);
    for (String tag : fragmentTags) {
        Fragment hideFrag = mRiggerTransaction.find(tag);
        if (hideFrag == null) continue;
        hideFrag.setUserVisibleHint(false);
    }
    fragment.setUserVisibleHint(true);
    boolean hidden = fragment.isHidden();
    boolean added = fragment.isAdded();
    if (!added || hidden || showRepeatAnim) {
        mRiggerTransaction.hide(getVisibleFragmentTags(containerViewId));
        showFragmentWithAnim(fragment);
    }
    mRiggerTransaction.commit();
}
 

public boolean isValidated(Category category) {
    category.setDisplayError(true);
    Fragment fragment = ((BaseActivity) context).mSupportFragmentManager.findFragmentByTag(AddCategoryFragment.class.getSimpleName());
    if (fragment != null && fragment.isAdded()) {
        AddCategoryFragment categoryFragment = ((AddCategoryFragment) fragment);
        if (!category.getCategoryNameError().isEmpty()) {
            categoryFragment.binding.categoryName.requestFocus();
            return false;
        }
        category.setDisplayError(false);
        return true;
    }
    return false;
}
 

/**
     * 修改显示的内容 不会重新加载
     **/
    public void switchContent(Fragment to) {
        Boolean isAdded = false;
        try {
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            if (getSupportFragmentManager().getFragments() != null) {
                for (Fragment f : getSupportFragmentManager().getFragments()) {
                    if (to.getClass().isAssignableFrom(f.getClass())) {
                        if (!f.isAdded()) {
                            transaction.add(R.id.fl_contain, f, f.getClass().getName());
                        } else {
                            transaction.show(f);
                        }
                        isAdded = true;
                    } else {
                        transaction.hide(f);
                        f.setUserVisibleHint(false);
                    }
                }
            }
            if (!isAdded) {
                if (!to.isAdded()) { // 先判断是否被add过
                    transaction.add(R.id.fl_contain, to, to.getClass().getName()).commitNow();
                } else {
                    transaction.show(to).commitNow(); // 隐藏当前的fragment，显示下一个
                }
            } else {
                transaction.commitNow();
            }
            if (getSupportFragmentManager().findFragmentByTag(to.getClass().getName()) != null) {
                getSupportFragmentManager().findFragmentByTag(to.getClass().getName()).setUserVisibleHint(true);
            }
//            setSelectedFragment((BaseFragment) to);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 

/**
 * 对Fragment进行显示隐藏的切换，减少fragment的重复创建
 * @param fragmentManager fragment管理器
 * @param hideFragment  需要隐藏的Fragment
 * @param showFragment  需要显示的Fragment
 * @param frameId   布局FrameLayout的Id
 * @param tag  fragment的唯一tag标识
 */
public static void switchFragment(FragmentManager fragmentManager, Fragment hideFragment, Fragment showFragment, int frameId, String tag) {
    if (fragmentManager != null) {
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        if (!showFragment.isAdded()) {
            transaction.hide(hideFragment)
                    .add(frameId, showFragment, tag)
                    .commit();
        } else {
            transaction.hide(hideFragment)
                    .show(showFragment)
                    .commit();
        }
    }
}
 

private void attachFragment(Fragment fragment, String tag) {
  if (fragment != null) {
    if (fragment.isDetached()) {
      ensureTransaction();

      fragmentTransaction.attach(fragment);
    } else if (!fragment.isAdded()) {
      ensureTransaction();

      fragmentTransaction.add(containerId, fragment, tag);
    }
  }
}
 

private void initFragments() {
    Fragment timeLineFragment = getMainTimeLineFragment();
    Fragment favFragment = getFavFragment();

    Fragment hotWeiboFragment = getHotWeiboViewPagerFragment();

    Fragment hotHuatiFragment = getHotHuaTiViewPagerFragment();

    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
    if (!timeLineFragment.isAdded()) {
        fragmentTransaction.add(R.id.center_frame_layout, timeLineFragment, MainTimeLineFragment.class.getName());
        fragmentTransaction.hide(timeLineFragment);
    }

    if (!favFragment.isAdded()) {
        fragmentTransaction.add(R.id.center_frame_layout, favFragment, MyFavListFragment.class.getName());
        fragmentTransaction.hide(favFragment);
    }

    if (!hotWeiboFragment.isAdded()) {
        fragmentTransaction.add(R.id.center_frame_layout, hotWeiboFragment, HotWeiboViewPagerFragment.class.getName());
        fragmentTransaction.hide(hotWeiboFragment);
    }

    if (!hotHuatiFragment.isAdded()) {
        fragmentTransaction.add(R.id.center_frame_layout, hotHuatiFragment, HotHuaTiViewPagerFragment.class.getName());
        fragmentTransaction.hide(hotHuatiFragment);
    }

    if (!fragmentTransaction.isEmpty()) {
        fragmentTransaction.commit();
        getSupportFragmentManager().executePendingTransactions();
    }
}
 

/**
 * 添加或者显示 fragment
 *
 * @param transaction
 * @param fragment
 */
protected void addOrShowFragment(FragmentTransaction transaction, Fragment fragment) {
    if (currentFragment == fragment)
        return;

    if (!fragment.isAdded()) { // 如果当前fragment未被添加，则添加到Fragment管理器中
        transaction.hide(currentFragment).add(R.id.main_content, fragment).commitAllowingStateLoss();
    } else {
        transaction.hide(currentFragment).show(fragment).commitAllowingStateLoss();
    }
    currentFragment = (BaseFragment) fragment;
}
 

private void switchFragment(Fragment from, Fragment to) {
    if (mCurrentFragment != to) {
        mCurrentFragment = to;
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        if (!to.isAdded()) {
            ft.hide(from).add(R.id.fl_main_page_content, to).commit();
        } else {
            ft.hide(from).show(to).commit();
        }
    }
}
 

private void switchFragment(Fragment fragment) {
    if (mContent != fragment) {
        if (!fragment.isAdded()) {//判断fragment是否已经添加过
            //先把当前的fragment隐藏，把用到的fragment添加上去
            getSupportFragmentManager().beginTransaction().hide(mContent).add(R.id.home_container, fragment).commit();
        } else {
            //先把当前的fragment隐藏，把已经添加过的并需要用到的fragment显示出
            getSupportFragmentManager().beginTransaction().hide(mContent).show(fragment).commit();
        }
        mContent = fragment;
    }
}
 

@Override
public Object instantiateItem(ViewGroup container, int position) {
    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }

    final long itemId = getItemId(position);

    // Do we already have this fragment?
    // String name = makeFragmentName(container.getId(), itemId);
    String name = getTag(position);
    Fragment fragment = mFragmentManager.findFragmentByTag(name);
    if (fragment != null) {
        if (DEBUG)
            Log.v(TAG, "Attaching item #" + itemId + ": f=" + fragment);
        mCurTransaction.attach(fragment);
    } else {
        fragment = getItem(position);
        if (DEBUG)
            Log.v(TAG, "Adding item #" + itemId + ": f=" + fragment);
        // mCurTransaction.add(container.getId(), fragment,
        // makeFragmentName(container.getId(), itemId));
        if (!fragment.isAdded())
            mCurTransaction.add(container.getId(), fragment, getTag(position));
        else
            mCurTransaction.show(fragment);
    }
    if (fragment != mCurrentPrimaryItem) {
        fragment.setMenuVisibility(false);
        fragment.setUserVisibleHint(false);
    }

    return fragment;
}
 

private void removeFragment(Fragment fragment) {
  if (fragment != null && fragment.isAdded()) {
    ensureTransaction();
    fragmentTransaction.remove(fragment);
  }
}
 

private void setHide(FragmentTransaction ft, Fragment fragment) {
    if (fragment.isAdded()) {
        ft.hide(fragment);
    }
}
 

public static boolean isAlive(Fragment fragment) {
    return fragment != null
            && fragment.isAdded()
            && fragment.getActivity() != null
            && !fragment.getActivity().isFinishing();
}
 

@Override
protected void onPostExecute(final File file) {
    if (mPD != null) {
        mPD.dismiss();
        mPD = null;
    }
    Fragment fragment = mFragmentRef.get();
    if (fragment != null && fragment.isAdded() &&fragment.getView() !=null) {
        Snackbar snackbar;
        if (file != null) {
            snackbar = Snackbar.make(fragment.getView(), "文件保存成功！路径：/sdcard/capture/logs/"+file.getName(), Snackbar.LENGTH_LONG);
            snackbar.setAction("去分享", new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    try {
                        Intent intent = new Intent(Intent.ACTION_SEND);
                        intent.addCategory(Intent.CATEGORY_DEFAULT);
                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                        Context context = v.getContext();
                        Uri uri;
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                            uri = FileProvider.getUriForFile(context, context.getPackageName(), file);
                        } else {
                            uri = Uri.fromFile(file);
                        }
                        intent.putExtra(Intent.EXTRA_STREAM, uri);
                        intent.setType("text/plain");
                        context.startActivity(Intent.createChooser(intent,file.getName()));
                    } catch (Exception e) {
                        HLog.e(e);
                    }
                }
            });
        } else {
            snackbar = Snackbar.make(fragment.getView(), "文件保存失败！", Snackbar.LENGTH_SHORT);
        }
        snackbar.show();
    }

}