Question

我为listview创建了customadapter。当我慢慢滚动时工作正常但是，我正在滚动快速应用程序崩溃。我看了一些关于这个的解决方案，但我不明白。我想我需要添加getViewTypeCount和getItemViewType，但我无法正确添加这些。

此处所有代码; http://pastebin.com/BZB9G9p7

CustomAdapter.java

package com.example.mete.cocuksarkilari;

import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class CustomAdapter extends ArrayAdapter<String>{

private final int VIEW_TYPE_STRING = 0;
private final int VIEW_TYPE_IMAGE = 1;
private final Activity context;
private final String[] names;
private final Integer[] imageId;

public CustomAdapter(Activity context, String[] names, Integer[] imageId) {
    super(context, R.layout.custom_row,names);
    this.context = context;
    this.names = names;
    this.imageId = imageId;

}

@Override
public int getViewTypeCount() {
    return 2;
}

@Override
public int getItemViewType(int position) {
    return (position == 0) ? VIEW_TYPE_STRING :VIEW_TYPE_IMAGE;
}

@Override
public View getView(int position, View view, ViewGroup parent) {
    LayoutInflater inflater = context.getLayoutInflater();
    View rowView= inflater.inflate(R.layout.custom_row, null, true);
    TextView txtTitle = (TextView) rowView.findViewById(R.id.textView);

    ImageView imageView = (ImageView) rowView.findViewById(R.id.imageView);
    txtTitle.setText(names[position]);

   try{
       imageView.setImageResource(imageId[position]);
   }catch (Exception e){

   }

    return rowView;
 }
}

LOG

02-01 17:22:51.001  14221-14221/com.example.mete.cocuksarkilari E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.mete.cocuksarkilari, PID: 14221
java.lang.OutOfMemoryError: Failed to allocate a 8087052 byte allocation with 2036816 free bytes and 1989KB until OOM
        at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
        at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
        at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:609)
        at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444)
        at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:988)
        at android.content.res.Resources.loadDrawableForCookie(Resources.java:2474)
        at android.content.res.Resources.loadDrawable(Resources.java:2381)
        at android.content.res.Resources.getDrawable(Resources.java:787)
        at android.content.Context.getDrawable(Context.java:403)
        at android.support.v4.content.ContextCompatApi21.getDrawable(ContextCompatApi21.java:26)
        at android.support.v4.content.ContextCompat.getDrawable(ContextCompat.java:321)
        at android.support.v7.widget.TintManager.getDrawable(TintManager.java:175)
        at android.support.v7.widget.TintManager.getDrawable(TintManager.java:168)
        at android.support.v7.widget.AppCompatImageHelper.setImageResource(AppCompatImageHelper.java:51)
        at android.support.v7.widget.AppCompatImageView.setImageResource(AppCompatImageView.java:72)
        at com.example.mete.cocuksarkilari.CustomAdapter.getView(CustomAdapter.java:47)
        at android.widget.AbsListView.obtainView(AbsListView.java:2347)
        at android.widget.ListView.makeAndAddView(ListView.java:1864)
        at android.widget.ListView.fillDown(ListView.java:698)
        at android.widget.ListView.fillGap(ListView.java:662)
        at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4991)
        at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3418)
        at android.widget.AbsListView.onTouchMove(AbsListView.java:3801)
        at android.widget.AbsListView.onTouchEvent(AbsListView.java:3632)
        at android.view.View.dispatchTouchEvent(View.java:8471)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2399)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2092)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
        at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2369)
        at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719)
        at android.app.Activity.dispatchTouchEvent(Activity.java:2742)
        at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
        at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2330)
        at android.view.View.dispatchPointerEvent(View.java:8666)
        at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123)
        at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
        at     android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680)
        at android.view.ViewRootImpl$InputSta

抱歉，我在pastebin中提供代码，因为它太长了，我在Customadapter中尝试了这段代码，但它没有用

private final int VIEW_TYPE_STRING = 0;
private final int VIEW_TYPE_IMAGE = 1;


@Override
public int getViewTypeCount() {
    return 2;
}

@Override
public int getItemViewType(int position) {
    return (position == 0) ? VIEW_TYPE_STRING :VIEW_TYPE_IMAGE;
}

Answer 1

使用

public View getView(int position, View convertView, ViewGroup parent)

利用convertView来节省内存使用量。

这是一篇很好的文章performance-tips-for-androids-listview。

Answer 2

您需要创建ViewHolder来快速滚动列表。这只是该持有人需要看起来如何的暗示：

public CustomAdapter(Activity context, String[] names, Integer[] imageId) {
    super(context, R.layout.custom_row,names);
    this.context = context;
    this.names = names;
    this.imageId = imageId;

}

static class MyViewHolder{
    TextView txtTitle;

MyViewHolder(View v){
            txtTitle = (TextView) v.findViewById(R.id.YourTextView);        

        }
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View row=convertView;
        MyViewHolder holder=null;
        if(row==null){      
        LayoutInflater inf=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row=inf.inflate(R.layout.your_row, parent, false);
        holder=new MyViewHolder(row);
        row.setTag(holder);

        }else{
            holder=(MyViewHolder) row.getTag();
        }           
        holder.txtTitle.setText(names[position]);
        return row;
    }   
}

Answer 3

您在适配器中加载的图像位图很可能很大，因此内存不足。

imageView.setImageResource(imageId[position]);

您也不会缓存任何内容。您基本上为列表视图中的每个项目分配一个新的位图（图像），因此会快速耗尽内存。

使用Picasso或Glide有效处理图片加载。另外你应该考虑调整原始图像的尺寸（质量较差，图像尺寸较小等），以免在OutOfMemoryExceptions中运行得太快......

Answer 4

尝试查看RecyclerView，它会强制执行Holder模式，并且您不太可能遇到内存问题。同样如Sockeqwe所建议的那样，你应该尝试使用Picasso来制作你的图像。

http://developer.android.com/training/material/lists-cards.html（recyclerview） http://square.github.io/picasso/

快速滚动时ListView崩溃

4 个答案: