IDEA 开发Android 时使用view pager结合list view遇到的list view不显示的问题

最新推荐文章于 2025-05-18 17:46:51 发布

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本文介绍了在使用IDEA开发Android应用时，如何解决在ViewPager中结合ListView导致ListView不显示的问题。通过删除ListViewActivity并将其功能整合到MainActivity中，实现了正确的显示效果。

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当时我是直接单独建了一个.java文件ListViewActivity.java来填充adapter，但是运行之后list view不显示，空空如也，怎么也解决不来。后来我把listview写在了mainactivity中就成功了，如果有大佬知道为什么请不吝赐教，下面的代码先是无法实现的，之后是可以实现的，如果有小伙伴有这样的情况出现，可以尝试一下我的方法

无法显示listview的内容的代码如下：
ListViewActivity.java

import android.support.annotation.Nullable;
import android.widget.ListView;

public class ListViewActivity extends Activity {

    private ListView mlv1;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.page_01);
        mlv1 = findViewById(R.id.lv_1);
        MyListAdapter adapter = new MyListAdapter(this);
        mlv1.setAdapter(adapter);
    }
}

MyListAdapter.java

package com.example.a17919.demo1;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;


public class MyListAdapter extends BaseAdapter {

    public Context mContent;

    private LayoutInflater mlayoutflater;
    public MyListAdapter(Context context)
    {
        this.mContent = context;
        mlayoutflater = LayoutInflater.from(context);
    }


    @Override
    public int getCount() {
        return 5;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }



    @Override
    public long getItemId(int position) {
        return 0;
    }

     class ViewHolder{
        public ImageView imageView;
        public TextView tvTitle,tvTime,tvContent;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if(convertView==null)
        {
            holder = new ViewHolder();
            convertView = mlayoutflater.inflate(R.layout.layout_list_item,parent,false);
            holder.imageView = convertView.findViewById(R.id.iv);
            holder.tvTitle = convertView.findViewById(R.id.tv_title);
            holder.tvTime = convertView.findViewById(R.id.tv_time);
            holder.tvContent = convertView.findViewById(R.id.tv_content);
            convertView.setTag(holder);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }

        //给控件赋值

        holder.imageView.setImageResource(R.drawable.ic_launcher_background);
        holder.tvTitle.setText("这是标题");
        holder.tvTime.setText("2020-12-12");
        holder.tvContent.setText("这是内容");

        return convertView;
    }
}

layout_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:orientation="horizontal"
              android:paddingLeft="15dp"
              android:paddingRight="15dp" 
              android:paddingTop="10dp" 
              android:paddingBottom="10dp">

    <ImageView  android:id="@+id/iv"
            android:layout_width="100dp" 
            android:layout_height="100dp" 
            android:scaleType="centerCrop" 
            android:background="#000"/>
    
    <LinearLayout android:layout_width="200dp"
                  android:layout_height="wrap_content" 
                  android:orientation="vertical"
                  android:paddingLeft="15dp">
        
        <TextView android:id="@+id/tv_title"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="hello"
                  android:textSize="20sp"
                  android:textColor="@color/colorblack"/>
        <TextView android:id="@+id/tv_time"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="2019-04-10"
                  android:layout_marginTop="10dp"
                  android:textSize="18sp"
                  android:textColor="@color/colorgrayDark"/>
        <TextView android:id="@+id/tv_content"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_marginTop="10dp"
                  android:textSize="18sp"
                  android:text="这是内容"
                  android:textColor="@color/colorgrayDark"/>
        
    </LinearLayout>
    <Button
            android:id="@+id/btn_listview2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/Btn_listview2"
            android:layout_gravity="bottom|end"/>

</LinearLayout>

page_01.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

    <ListView  android:id="@+id/lv_1"
               android:layout_width="match_parent"
               android:layout_height="match_parent">

    </ListView>


</RelativeLayout>

MainActivity.java

package com.example.a17919.demo1;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;


public class MainActivity extends Activity implements OnClickListener,OnPageChangeListener{

    // 底部菜单4个Linearlayout
    private LinearLayout ll_home;
    private LinearLayout ll_mine;

    // 底部菜单4个ImageView
    private ImageView iv_home;
    private ImageView iv_mine;

    // 底部菜单4个菜单标题
    private TextView tv_home;
    private TextView tv_mine;

    // 中间内容区域
    private ViewPager viewPager;

    // ViewPager适配器ContentAdapter
    private ContentAdapter adapter;

    private List<View> views;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        // 初始化控件
        initView();
        // 初始化底部按钮事件
        initEvent();

    }

    private void initEvent() {
        // 设置按钮监听
        ll_home.setOnClickListener(this);
        ll_mine.setOnClickListener(this);


        //设置ViewPager滑动监听
        viewPager.setOnPageChangeListener(this);
    }

    private void initView() {

        // 底部菜单4个Linearlayout
        this.ll_home =  findViewById(R.id.ll_home);
        this.ll_mine =  findViewById(R.id.ll_mine);

        // 底部菜单4个ImageView
        this.iv_home =  findViewById(R.id.iv_home);
        this.iv_mine =  findViewById(R.id.iv_mine);

        // 底部菜单4个菜单标题
        this.tv_home =  findViewById(R.id.tv_home);
        this.tv_mine =  findViewById(R.id.tv_mine);

        // 中间内容区域ViewPager
        this.viewPager =  findViewById(R.id.vp_content);

        // 适配器
        View page_01 = View.inflate(MainActivity.this, R.layout.page_01, null);
        View page_02 = View.inflate(MainActivity.this, R.layout.page_02, null);

        views = new ArrayList<View>();
        views.add(page_01);
        views.add(page_02);

        this.adapter = new ContentAdapter(views);
        viewPager.setAdapter(adapter);
    }

    @Override
    public void onClick(View v) {
        // 在每次点击后将所有的底部按钮(ImageView,TextView)颜色改为灰色，然后根据点击着色
        restartBotton();
        // ImageView和TetxView置为绿色，页面随之跳转

        Intent intent = null;
        switch (v.getId()) {
            case R.id.ll_home:
                iv_home.setImageResource(R.drawable.shouye);
                tv_home.setTextColor(0xff1B940A);
                viewPager.setCurrentItem(0);
                break;
            case R.id.ll_mine:
                iv_mine.setImageResource(R.drawable.dingwei);
                tv_mine.setTextColor(0xff1B940A);
                viewPager.setCurrentItem(1);
                break;



            default:
                break;
        }

    }

    private void restartBotton() {
        // ImageView置为灰色
        iv_home.setImageResource(R.drawable.shouye);
        iv_mine.setImageResource(R.drawable.dingwei);
        // TextView置为白色
        tv_home.setTextColor(0xffffffff);
        tv_mine.setTextColor(0xffffffff);
    }

    @Override
    public void onPageScrollStateChanged(int arg0) {

    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {

    }

    @Override
    public void onPageSelected(int arg0) {
        restartBotton();
        //当前view被选择的时候,改变底部菜单图片，文字颜色
        switch (arg0) {
            case 0:
                iv_home.setImageResource(R.drawable.shouye);
                tv_home.setTextColor(0xff1B940A);
                break;
            case 1:
                iv_mine.setImageResource(R.drawable.dingwei);
                tv_mine.setTextColor(0xff1B940A);
                break;

            default:
                break;
        }

    }



}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical" >

    <include layout="@layout/activity_top" />

    <android.support.v4.view.ViewPager
            android:id="@+id/vp_content"
            android:layout_width="match_parent"
            android:background="#ffffff"
            android:layout_height="0dp"
            android:layout_weight="1" >
    </android.support.v4.view.ViewPager>

    <include layout="@layout/activity_bottom" />

</LinearLayout>

将ListViewActivity.java弃用删除后在mainactivity.java中添加

ListView listView1 = page_01.findViewById(R.id.lv_1);
        MyListAdapter adapter = new MyListAdapter(this);
        listView1.setAdapter(adapter);

具体添加位置如下：

package com.example.a17919.demo1;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;


public class MainActivity extends Activity implements OnClickListener,OnPageChangeListener{

    // 底部菜单4个Linearlayout
    private LinearLayout ll_home;
    private LinearLayout ll_mine;

    // 底部菜单4个ImageView
    private ImageView iv_home;
    private ImageView iv_mine;

    // 底部菜单4个菜单标题
    private TextView tv_home;
    private TextView tv_mine;

    // 中间内容区域
    private ViewPager viewPager;

    // ViewPager适配器ContentAdapter
    private ContentAdapter adapter;

    private List<View> views;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        // 初始化控件
        initView();
        // 初始化底部按钮事件
        initEvent();

    }

    private void initEvent() {
        // 设置按钮监听
        ll_home.setOnClickListener(this);
        ll_mine.setOnClickListener(this);


        //设置ViewPager滑动监听
        viewPager.setOnPageChangeListener(this);
    }

    private void initView() {

        // 底部菜单4个Linearlayout
        this.ll_home =  findViewById(R.id.ll_home);
        this.ll_mine =  findViewById(R.id.ll_mine);

        // 底部菜单4个ImageView
        this.iv_home =  findViewById(R.id.iv_home);
        this.iv_mine =  findViewById(R.id.iv_mine);

        // 底部菜单4个菜单标题
        this.tv_home =  findViewById(R.id.tv_home);
        this.tv_mine =  findViewById(R.id.tv_mine);

        // 中间内容区域ViewPager
        this.viewPager =  findViewById(R.id.vp_content);

        // 适配器
        View page_01 = View.inflate(MainActivity.this, R.layout.page_01, null);
        View page_02 = View.inflate(MainActivity.this, R.layout.page_02, null);

        views = new ArrayList<View>();
        views.add(page_01);
        views.add(page_02);

        this.adapter = new ContentAdapter(views);
        viewPager.setAdapter(adapter);


        ListView listView1 = page_01.findViewById(R.id.lv_1);
        MyListAdapter adapter = new MyListAdapter(this);
        listView1.setAdapter(adapter);
    }

    @Override
    public void onClick(View v) {
        // 在每次点击后将所有的底部按钮(ImageView,TextView)颜色改为灰色，然后根据点击着色
        restartBotton();
        // ImageView和TetxView置为绿色，页面随之跳转

        Intent intent = null;
        switch (v.getId()) {
            case R.id.ll_home:
                iv_home.setImageResource(R.drawable.shouye);
                tv_home.setTextColor(0xff1B940A);
                viewPager.setCurrentItem(0);
                break;
            case R.id.ll_mine:
                iv_mine.setImageResource(R.drawable.dingwei);
                tv_mine.setTextColor(0xff1B940A);
                viewPager.setCurrentItem(1);
                break;



            default:
                break;
        }

    }

    private void restartBotton() {
        // ImageView置为灰色
        iv_home.setImageResource(R.drawable.shouye);
        iv_mine.setImageResource(R.drawable.dingwei);
        // TextView置为白色
        tv_home.setTextColor(0xffffffff);
        tv_mine.setTextColor(0xffffffff);
    }

    @Override
    public void onPageScrollStateChanged(int arg0) {

    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {

    }

    @Override
    public void onPageSelected(int arg0) {
        restartBotton();
        //当前view被选择的时候,改变底部菜单图片，文字颜色
        switch (arg0) {
            case 0:
                iv_home.setImageResource(R.drawable.shouye);
                tv_home.setTextColor(0xff1B940A);
                break;
            case 1:
                iv_mine.setImageResource(R.drawable.dingwei);
                tv_mine.setTextColor(0xff1B940A);
                break;

            default:
                break;
        }

    }



}