Question

我有一个列表视图，显示目录中的图像，它正在加载图像，但滚动后向上滚动，我必须从屏幕上移开我的手指，然后将其放回屏幕滚动备份。如果滚动太快，应用程序崩溃，logcat说OutOfMemoryError。

这是我的代码：

package com.search.visual;


import java.io.File;
import java.io.FilenameFilter;

import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;


public class history extends ListActivity{

private String dir = ".vis";
private File images;
private File [] imageList;
private File item;
private Uri [] ImageRef;
private ImageView imageView;


@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    setContentView(R.layout.history);




    loadPics();



}



public class ImageAdapter extends BaseAdapter {
    int Background;
    private Context con;



    public ImageAdapter(Context c) {
        con = c;
        TypedArray attr = con.obtainStyledAttributes(R.styleable.HelloGallery);
        Background = attr.getResourceId(
                R.styleable.HelloGallery_android_galleryItemBackground, 0);
        attr.recycle();
    }

    public int getCount() {
        return ImageRef.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

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



        imageView = new ImageView(con);
        imageView.setImageURI(ImageRef[position]);
        imageView.setLayoutParams(new ListView.LayoutParams(75, 75));
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);

        imageView.setBackgroundResource(Background);

        return imageView;
    }


}

 protected void onListItemClick(ListView l, View v, int position, long id) {

     item = imageList[position];
     Intent i = new Intent("com.search.visual.IMAGE");

        i.putExtra(Intent.EXTRA_STREAM, item);
        startActivity(i);           //StIntring imname = (String) ;
   }





@Override
protected void onResume() {
    // TODO Auto-generated method stub
    loadPics();
    super.onResume();
}

public void loadPics(){

    images = Environment.getExternalStoragePublicDirectory(dir);
    imageList = images.listFiles(new FilenameFilter() {

        public boolean accept(File dir, String filename) {
            // TODO Auto-generated method stub
            return (filename.endsWith(".jpg"));
        }
    });

    if(imageList.length > 0 ){
    ImageRef = new Uri[imageList.length];

    for(int i = 0; i<imageList.length; i++){
        ImageRef[i] = Uri.parse(imageList[i].getAbsolutePath());

    }

    setListAdapter(new ImageAdapter(this));
    }else{
        Intent i = new Intent("com.search.visual.ERROR");
        startActivity(i);
    }
}


}

如果有人知道为什么会发生这种情况，那将非常感谢你的帮助

Answer 1

滚动列表视图时，所有图像都存储在native heap和recycler of native heap is too lazy中。因此，从listview中滚动图像收集垃圾的速度很慢，这就是为什么你的device's heap is become full会得到OutOfMemory异常。

所以我认为你sholud try your own recycler用于处理应用程序中的图像和使用过的图像的free the memory。

你必须回收位图。位图实现是本机的，因此java对象很小并且是垃圾收集的不良候选者，但仍然分配了内存。塔卡期待Bitmap.recycle()

或者只是尝试Lazzy Loading images in Listview。

Android: Strange out of memory issue和OutOfMemory exception appears while scrolling the list of images

感谢。

imageview不断崩溃

1 个答案: