Type mismatch: cannot convert from CharFragment to Fragment错误
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错误提示:无法将CharFagment (Fragment的子类)强制转换成Fragment,后来发现是CharFagment 类中调用的包(android.app.Fragment)与Activity里边调用的包(import android.support.v4.app.Fragment)不一致,所以将CharFagment中导入的包改成android.support.v4.app.Fragment就没问题了。
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