大佬，刚刚以为解决了，没想到还是有点问题，请大佬再指点一下

[DavaLc]

大佬，如果只有一个fragment ，像demo里那么写没有问题。 但是多个fragment 还是会出现刚刚的报错。 Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.internal.view.ContextThemeWrapper"

我是这么添加的fragment

/**

• 获取到fragment集合
• @return / private ArrayList getFragments() { fragments.add(HotDramaFragment.newInstance()); fragments.add(FilmFanFragment.newInstance()); fragments.add(MessageFragment.newInstance()); fragments.add(MyFragment2.newInstance()); return fragments; } /*
• 设置默认的fragment */ public void setDefaultFragment() { setBottomView(0); }

//设置底部导航栏的改变 private void setBottomView(int i) { rljIv.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.tab_chat_2)); rljTv.setTextColor(ContextCompat.getColor(this, R.color.color_888888)); ysmIv.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.tab_fans_2)); ysmTv.setTextColor(ContextCompat.getColor(this, R.color.color_888888)); xsIv.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.tab_news_2)); xsTv.setTextColor(ContextCompat.getColor(this, R.color.color_888888)); myIv.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.tab_user_2)); myTv.setTextColor(ContextCompat.getColor(this, R.color.color_888888));

if (i == 0) {
    rljIv.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.tab_chat_1));
    rljTv.setTextColor(ContextCompat.getColor(this, R.color.color_f06868));
} else if (i == 1) {
    if (mainLll.getVisibility()== View.GONE){
        showFooter();
    }
    ysmIv.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.tab_fans_1));
    ysmTv.setTextColor(ContextCompat.getColor(this, R.color.color_f06868));
} else if (i == 2) {
    if (mainLll.getVisibility()==View.GONE){
        showFooter();
    }
    xsIv.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.tab_news_1));
    xsTv.setTextColor(ContextCompat.getColor(this, R.color.color_f06868));
} else if (i == 3) {
    if (mainLll.getVisibility()==View.GONE){
        showFooter();
    }
    myIv.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.tab_user_1));
    myTv.setTextColor(ContextCompat.getColor(this, R.color.color_f06868));
}

showFragment(i);

} private int lastPosition = -1;//最后选择的位置 private int curIndex = -1;// 当前选中的左侧菜单的下标 //展示fragment public void showFragment(int index){ if(index == lastPosition) return; FragmentManager fm = getSupportFragmentManager(); FragmentTransaction trx = fm.beginTransaction(); if(curIndex != -1) trx.hide(fragments.get(curIndex));

if (!fragments.get(index).isAdded()) {
    trx.add(R.id.layFrame, fragments.get(index),
            "fragment_" + index);
}
trx.show(fragments.get(index)).commitAllowingStateLoss();
curIndex = index;

}

public void hideFooter(){ mainLll.setVisibility(View.GONE); } public void showFooter(){ mainLll.setVisibility(View.VISIBLE); }

[DavaLc]

其中HotDramaFragment 就是demo里的VideoFragment，与VideoFragment完全一致

[CarGuo]

你需要看的是，哪个地方的context转化出现了问题，调用的层级依次是哪些

[DavaLc]

彻底解决这个问题了。我Activity之前继承的是FragmentActivity，可能是与module里v7包有冲突。改成AppCompatActivity就解决问题了。