Question

试图从片段开始活动，但是它不起作用，我也找不到问题而且社区中没有其他可行的答案当单击tn（button7）时，没有任何反应在2个模拟器和华为电话中试用过

** sst.java（片段）**

public class sst extends Fragment {
Button btn ;
@Override
public void onCreate( Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Toast.makeText(getContext(),"اختر مادة الكتاب",Toast.LENGTH_SHORT).show();

}

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_sst, container, false);
    btn = (Button) v.findViewById(R.id.button7);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getActivity(), BooksExploreActivity.class) ;
            intent.putExtra("subj" , "3olomTabe3ya") ;
            getActivity().startActivity(intent);
        }
    });
    return inflater.inflate(R.layout.fragment_sst, container, false);
}

}

fragment_sst.xml

<?xml version="1.0" encoding="utf-8"?>

<TextView
    android:id="@+id/textView19"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="8dp"
    android:fontFamily="@font/monadi"
    android:text="اختر مادة الكتاب"
    android:textColor="@color/colorPrimary"
    android:textSize="24dp" />

<Button
    android:id="@+id/button7"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/button13"
    android:layout_alignStart="@+id/button13"
    android:layout_below="@+id/textView19"
    android:layout_marginTop="8dp"
    android:background="@drawable/fragmentsbutton"
    android:text="العلوم الطبيعية"
    android:textColor="#fff"
    android:textSize="19dp"
    />

<Button
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/button7"
    android:layout_alignStart="@+id/button7"
    android:layout_below="@+id/button7"
    android:layout_marginTop="19dp"
    android:background="@drawable/fragmentsbutton"
    android:text="الرياضيات"
    android:textColor="#fff"
    android:textSize="18dp"
    android:id="@+id/button8" />
    </RelativeLayout>
    </android.support.v4.widget.NestedScrollView>

谢谢。

Answer 1

更改

return inflater.inflate(R.layout.fragment_sst, container, false);

使用

return v;

使用您的解决方案，您将返回原始视图，而按钮上没有“自定义操作”。

Answer 2

查看问题是您使用View v进行了逻辑处理，但是随后又返回了一个逻辑，则必须对此进行更改：

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_sst, container, false);
    btn = (Button) v.findViewById(R.id.button7);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getActivity(), BooksExploreActivity.class) ;
            intent.putExtra("subj" , "3olomTabe3ya") ;
            getActivity().startActivity(intent);
        }
    });
    return inflater.inflate(R.layout.fragment_sst, container, false); // change this
}

收件人：

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_sst, container, false);
    btn = (Button) v.findViewById(R.id.button7);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getActivity(), BooksExploreActivity.class) ;
            intent.putExtra("subj" , "3olomTabe3ya") ;
            getActivity().startActivity(intent);
        }
    });
    return v; // here is where the change is
}

无法从片段开始活动

2 个答案: