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2024-01-26 c2d382d99ca506932985d1843d4371d6ed0203ff

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package com.lcjian.library.util;
 
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.util.Log;
 
public class FragmentSwitchHelper {
 
    private static final String TAG = "FragmentSwitchHelper";
 
    public FragmentManager mFragmentManager;
 
    private Fragment[] mFragments;
 
    private Fragment mCurrentFragment;
 
    private int mContainerId;
 
    public Fragment getFragmentByName(String name) {
        if (mFragments == null || mFragments.length == 0)
            return null;
        for (Fragment m : mFragments)
            if (name.contains(m.getClass().getName())) {
                return m;
            }
        return null;
    }
 
    public static FragmentSwitchHelper create(int containerId,
            FragmentManager fragmentManager, Fragment... fragments) {
        return new FragmentSwitchHelper(containerId, fragmentManager, fragments);
    }
 
    private FragmentSwitchHelper(int containerId,
            FragmentManager fragmentManager, Fragment... fragments) {
        this.mContainerId = containerId;
        this.mFragments = fragments;
        this.mFragmentManager = fragmentManager;
    }
 
    public void changeFragment(Class<? extends Fragment> replaceFragmentClass) {
        if (!mFragmentManager.isDestroyed()) {
            Fragment replaceFragment = mFragmentManager
                    .findFragmentByTag(replaceFragmentClass.getName());
            if (mCurrentFragment == replaceFragment && mCurrentFragment != null) {
                Log.d(TAG, "changeFragment noChange ");
                return;
            }
            FragmentTransaction fragmentTransaction = mFragmentManager
                    .beginTransaction();
            if (mCurrentFragment != null) {
                fragmentTransaction.detach(mCurrentFragment);
                Log.d(TAG, "changeFragment detach "
                        + mCurrentFragment.getClass().getName());
            }
            if (replaceFragment == null) {
                for (Fragment item : mFragments) {
                    if (item.getClass().getName()
                            .equals(replaceFragmentClass.getName())) {
                        replaceFragment = item;
                        break;
                    }
                }
                fragmentTransaction.add(mContainerId, replaceFragment,
                        replaceFragmentClass.getName());
                mCurrentFragment = replaceFragment;
                Log.d(TAG,
                        "changeFragment add " + replaceFragmentClass.getName());
            } else {
                fragmentTransaction.attach(replaceFragment);
                mCurrentFragment = replaceFragment;
                Log.d(TAG,
                        "changeFragment attach "
                                + replaceFragmentClass.getName());
            }
            fragmentTransaction.commitAllowingStateLoss();
        }
    }
}