关于数据不同步 Inconsistency detected vs The content of the adapter has changed but ListView ......

最新推荐文章于 2023-04-07 18:22:01 发布

原创最新推荐文章于 2023-04-07 18:22:01 发布 · 267 阅读

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本文通过实例演示了在Android开发中ListView与RecyclerView面对数据更新时的不同表现及常见错误。介绍了如何避免数据不同步问题，包括使用适配器的通知机制、进行深拷贝以及合理管理数据变更。

关于数据不同步的问题

ListView

1.报错: java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. Make sure your adapter calls notifyDataSetChanged() when its content changes.

2. 出现时机：点击

RecyclerView

1.报错 java.lang.IndexOutOfBoundsException: Inconsistency detected

2.出现时机：滑动

复现步骤Demo:

package com.example.administrator.recycleviewmultidemo.demo;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.chad.library.adapter.base.entity.MultiItemEntity;
import com.example.administrator.recycleviewmultidemo.R;

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

public class MainActivity extends Activity {

    private RecyclerView rv;
    private ListView lv;

    private List<Object> beans = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        beans.add(null);
        doRecycleView();
//        doListView();

    }

    private void doListView() {
        lv = findViewById(R.id.lv);
        lv.setAdapter(new BaseAdapter() {
            @Override
            public int getCount() {
                return beans.size();
            }

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

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

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                TextView tv = new TextView(MainActivity.this);
                tv.setHeight(200);
                tv.setText("hhhhhdddddddddddddddddddd");
                return tv;
            }
        });
        lv.postDelayed(new Runnable() {
            @Override
            public void run() {
                beans.clear();
            }
        },3000);
    }

    private void doRecycleView() {
        rv = findViewById(R.id.rv);
        rv.setLayoutManager(new LinearLayoutManager(this));
        rv.setAdapter(new MyRecycleAdapter());
        rv.postDelayed(new Runnable() {
            @Override
            public void run() {
                beans.clear();
            }
        },3000);
    }

    class  MyRecycleAdapter extends RecyclerView.Adapter{

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            TextView tv = new TextView(MainActivity.this);
            tv.setHeight(200);
            tv.setText("hhhhhdddddddddddddddddddd");
            return  new RecyclerView.ViewHolder(tv){

            };
        }

        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        }

        @Override
        public int getItemCount() {
            return beans.size();
        }
    }




}

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">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <ListView
        android:visibility="gone"
        android:id="@+id/lv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

分别使用上面的doListView() 和doRecycleView() 可以复现（注意修改xml）

解决：1.避免数据不同步，数据改变要通知

2.深拷贝

3.不要直接改变adapter的数据，使用临时变量存储过渡