为什么具有300个图像的应用程序停止工作

Question

我创建了一个由300个图像组成的应用程序。在应用程序开始时，它工作得很慢，没有问题。但当我启动加载图像的listactivity时，我的应用程序就会停止响应。帮帮我。

这是我的MainActivity代码。我将图像压缩文件从assets文件夹复制到内部存储器，提取内部存储器中的图像，然后在主活动的网格视图中显示它们。

private void createDirs()
{
File zipFileLoc = new File(storagePath, zipLoc);
File unzipFileLoc = new File(storagePath, unzipLoc);
File aksFileLoc = new File(storagePath, aks);
if(zipFileLoc.exists() && unzipFileLoc.exists() && aksFileLoc.exists()){
getFromStorage();
}else{
zipFileLoc.mkdirs();
unzipFileLoc.mkdirs();
aksFileLoc.mkdirs();
copyAssets();
unzip();
getFromStorage();
}
}
private void copyAssets()
{
AssetManager assets = getAssets();
String[] files = null;
try{
files = assets.list("");
}catch(Exception e){
Toast.makeText(this, "Failed to load images, please restart app", Toast.LENGTH_LONG).show();
}
for(String fileName : files){
InputStream in = null;
OutputStream out = null;
try{
in = assets.open(fileName);
File zipOutFile = new File(storagePath + zipLoc, fileName);
out =new FileOutputStream(zipOutFile);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
}catch(Exception e){
Toast.makeText(this, "Failed to load images, please restart app", Toast.LENGTH_LONG).show();
}
}
}
private void copyFile(InputStream in, OutputStream out) throws IOException
{
byte[] buffer = new byte[1024];
int read;
while((read = in.read(buffer)) != -1){
out.write(buffer, 0, read);
}
}
private void unzip()
{
pd = new ProgressDialog(this);
pd.setMessage("Please wait...");
pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);
pd.setCancelable(false);
pd.show();
new UnZipTask().execute(storagePath + zipLoc + "/AAGRIKOLISTATUS.zip", storagePath + aks);
}
private class UnZipTask extends AsyncTask<String, Void, Boolean>
{
@SuppressWarnings("rawtypes")
@Override
protected Boolean doInBackground(String[] p1)
{
String filePath = p1[0];
String destinationPath = p1[1];
File archive = new File(filePath);
try{
ZipFile zf = new ZipFile(archive);
for(Enumeration e = zf.entries(); e.hasMoreElements();){
ZipEntry entry = (ZipEntry) e.nextElement();
unzipEntry(zf, entry, destinationPath);
}
UnzipUtil d = new UnzipUtil(storagePath + zipLoc + "/AAGRIKOLISTATUS.zip", storagePath + aks);
d.unzip();
}catch(Exception e){
return false;
}
return true;
}
@Override
protected void onPostExecute(Boolean result)
{
pd.dismiss();
}
private void unzipEntry(ZipFile zf, ZipEntry entry, String destinationPath) throws IOException
{
if(entry.isDirectory()){
createDir(new File(destinationPath, entry.getName()));
return;
}
File outputFile = new File(destinationPath, entry.getName());
if(!outputFile.getParentFile().exists()){
createDir(outputFile.getParentFile());
}
BufferedInputStream inputs = new BufferedInputStream(zf.getInputStream(entry));
BufferedOutputStream outputs = new BufferedOutputStream(new FileOutputStream(outputFile));
try{
}finally{
outputs.flush();
outputs.close();
inputs.close();
}
}
private void createDir(File file)
{
if(file.exists()){
return;
}
if(!file.mkdirs()){
throw new RuntimeException("Cannot create file " + file);
}
}
}
private void getFromStorage()
{
File file = new File(storagePath, aks);
if(file.isDirectory()){
listfile= file.listFiles();
for(int i = 0; i < listfile.length; i++){
f.add(listfile[i].getAbsolutePath());
}
}
ad = new ImageAdapter(this);
gv.setAdapter(ad);
}
public class ImageAdapter extends BaseAdapter
{
Context context;
public ImageAdapter(Context cxt)
{
this.context = cxt;
}
@Override
public int getCount()
{
return f.size();
}
@Override
public Object getItem(int p1)
{
return p1;
}
@Override
public long getItemId(int p1)
{
return p1;
}
@Override
public View getView(int p1, View p2, ViewGroup p3)
{
ImageView iv = new ImageView(context);
Bitmap bm = BitmapFactory.decodeFile(f.get(p1));
iv.setImageBitmap(bm);
iv.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
iv.setLayoutParams(new GridView.LayoutParams(240, 240));
return iv;
}
}

这是我的main.xml

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp"
android:gravity="center"
android:background="#00ff85">
<GridView
android:layout_height="match_parent"
android:layout_width="match_parent"
android:id="@+id/aagrikolistatusphotoGridView"
android:layout_above="@+id/aagrikolistatusphotocomgoogleandroidgmsadsAdView"
android:columnWidth="90dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:horizontalSpacing="5dp"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
android:verticalSpacing="5dp"/>

Answer 1

即使您在后台线程上解包图像，但在主线程上加载图像，这会导致UI崩溃。解决方案是使用Glide或Picasso在背景线程上加载图像。请阅读谷歌文档：https://developer.android.com/topic/performance/graphics/load-bitmap#java
并尝试使用其中一个：
滑翔：https://github.com/bumptech/glide
毕加索：http://square.github.io/picasso/
这应该有助于解决你的问题