在哪里可以添加 FindViewById() 和片段中的侦听器？

Question

我创建了一个 Fragment 并将其命名为 Kabar，我可以看到 Button 和 TextView 按预期出现。

这是我的 Fragment:

public class Kabar extends Fragment   {
    private Button button;
    private TextView text;

    public Kabar() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v= inflater.inflate(R.layout.fragment_kabar , container, false);
        return v;
    }
}

这是我的 fragment_kabar 布局：

 <FrameLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context="com.examplee.my.Kabar">

     <!-- TODO: Update blank fragment layout -->
     <RelativeLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent">
         <TextView
             android:id="@+id/tt1"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="mohsen kabar" />

         <Button
             android:id="@+id/tt2"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="113dp"
             android:text="Button"
             android:layout_below="@+id/mohsenkabar"
             android:layout_alignParentRight="true"
             android:layout_alignParentEnd="true"
             android:layout_marginRight="93dp"
             android:layout_marginEnd="93dp" />
     </RelativeLayout>

我需要使用 Button 和 TextView。

我在哪里可以放置此代码？

text=(TextView) text.findViewById(R.id.tt1);
button=(Button) button.findViewById(R.id.tt2);
button.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        tt1.setText("kkk mmm bbb ddd");
    }
});

Answer 1

尝试将此代码添加到您的 kabar 片段中

  @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v= inflater.inflate(R.layout.fragment_kabar , container, false);

      TextView  text=(TextView) v.findViewById(R.id.tt1);
      TextView  button=(TextView) v.findViewById(R.id.tt2);

      button.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
      text.setText("kkk mmm bbb ddd");
       }
   });
    return v;
}

Answer 2

有两个选项 onCreateView 和 onViewCreated（首选）方法。

void onViewCreated(View视图, 捆绑 savedInstanceState)

Called immediately after onCreateView(LayoutInflater, ViewGroup, Bundle) has returned, but before any saved state has been restored in to the view. This gives subclasses a chance to initialize themselves once they know their view hierarchy has been completely created. The fragment's view hierarchy is not however attached to its parent at this point.

Answer 3

将您的代码替换为 onCreateView

中的以下代码

text  =(TextView) v.findViewById(R.id.tt1); 
button=(Button) v.findViewById(R.id.tt2); 
button.setOnClickListener(new View.OnClickListener() { 

    @Override 
    public void onClick(View v) {
        text.setText("kkk mmmm bbbb ddd"); 
    } 
});

Answer 4

在您的代码中进行此更改

text=(TextView) v.findViewById(R.id.tt1);
button=(Button) v.findViewById(R.id.tt2);
button.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        text.setText("kkk 'mmm' 'bbb' 'ddd'");
    }
});

Answer 5

您应该在您的 Kabar OnCreateView 中添加您的代码 Fragment:

public class Kabar extends Fragment {

    private Button button;
    private TextView text;

    public Kabar() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                     Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.fragment_kabar , container, false);

        TextView  text = (TextView) v.findViewById(R.id.tt1);
        Button button = (Button) v.findViewById(R.id.tt2);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                text.setText("kkk mmm bbb ddd");
            }
        });
        return v;
    }
}

在哪里可以添加 FindViewById() 和片段中的侦听器？

Where can I add the FindViewById() and the listeners in a fragment?

android

android-fragments

android-fragmentactivity