再次调用“onCreateView” - Android

Posted 2023-04-18

【中文标题】再次调用“onCreateView” - Android

【英文标题】：call "onCreateView" again - Android

【发布时间】：2018-12-02 13:38:36

【问题描述】：

我正在尝试调用函数“onCreateView”（在第一个代码中）并在下面的第二个代码中调用它。 我需要在代码运行时将片段添加到堆栈中。 如果有其他好的方法，我很乐意听到。

关于函数的小解释： 该函数发送一些参数来创建一个新的卡片视图。 在接收参数的函数中，有一个循环使用“get count”创建卡片堆栈。 我需要在运行时更改“获取计数”...

感谢您的每一个帮助！

import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;
import android.support.v4.app.FragmentActivity;

import java.util.Random;

public class RecentsFragment extends Fragment 
    public int child_count = 3;
    View ContainerContent;
    boolean Appearance;
    static RecentsFragment newInstance() 
        RecentsFragment f = new RecentsFragment();
        return f;
    

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 
        View v = inflater.inflate(R.layout.materialrecents_activity_recents, container, false);
        ContainerContent = getLayoutInflater().inflate(R.layout.activity_recents, container, false);
        final int[] colors = new int[]0xff7fffff, 0xffff7fff, 0xffffff7f, 0xff7f7fff, 0xffff7f7f, 0xff7fff7f;
        final Random random = new Random();
        RecentsList recents = (RecentsList) v.findViewById(R.id.recents);
        recents.setAdapter(new RecentsAdapter() 
            @Override
            public String getTitle() 
                return "Item ";
            

            @Override
            public View getView() 
                ImageView iv = new ImageView(getActivity());
                //iv.setScaleType(ImageView.ScaleType.CENTER_CROP);
                iv.setImageResource(R.drawable.room_back);
                //iv.setBackgroundColor(R.drawable.mazda);
                return iv;
            

            @Override
            public Drawable getIcon() 
                return getResources().getDrawable(R.mipmap.ic_launcher);
            

            @Override
            public int getHeaderColor() 
                return 0xff9900;
            

            @Override
            public int getCount() 
                return child_count;
            
        );

        recents.setOnItemClickListener(new RecentsList.OnItemClickListener() 
            @Override
            public void onItemClick(View view, int i) 
                onItemExpand(Appearance,view);
                //Toast.makeText(view.getContext(), "Card " + i + " clicked", Toast.LENGTH_SHORT).show();
            
        );
        return v;
    

    public void onItemExpand(boolean b,View view) 
        //mContainerContent.setVisibility(b ? View.VISIBLE: View.GONE);
        if (b) 
            ViewAppearByEffect(ContainerContent);
            Toast.makeText(view.getContext(), "Card " + " clicked", Toast.LENGTH_SHORT).show();
            Appearance = !Appearance;
         else 
            ContainerContent.setVisibility(View.GONE);
            Appearance = !Appearance;
        
    

    public void ViewAppearByEffect(View view)
    
        view.setAlpha(0);
        view.setVisibility(View.VISIBLE);
        view.animate().alpha(1.0f).setDuration(300);
        //view.animate().rotation(360);
    

    public void addCount() 
        child_count++;
    

主要活动：

import android.app.Activity;
import android.app.ActivityOptions;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.widget.Button;

public class RecentsActivity extends FragmentActivity 
    MyAdapter mAdapter;
    ViewPager mPager;
    //RecentsFragment firstFragment = new RecentsFragment();
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_pager);
        mAdapter = new MyAdapter(getSupportFragmentManager());
        mPager = (ViewPager) findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);

        // Watch for button clicks.
        Button button = (Button) findViewById(R.id.goto_first);
        button.setOnClickListener(new View.OnClickListener() 
            public void onClick(View v) 
                mPager.setCurrentItem(0);
                //firstFragment.setArguments(getIntent().getExtras());
                //firstFragment.addCount();
                //getSupportFragmentManager().beginTransaction().add(R.id.pager, firstFragment);

            
        );

        button = (Button) findViewById(R.id.goto_last);
        button.setOnClickListener(new View.OnClickListener() 
            public void onClick(View v) 
                mPager.setCurrentItem(mAdapter.getCount() - 1);
            
        );
    

【问题讨论】：

手动调用Activity/Fragment 回调，如onCreateView/onCreate 是错误的。您必须创建一个函数，在其中执行请求的操作并从onCreateView 调用它，并且每当您想重新执行代码时

【参考方案1】：

只需创建一个方法ex。 updateUI 将您的添加卡片或更新数据逻辑放在此方法中，每当您获取数据时，然后将数据传递给此方法。