我正在创建一个包含特定网址文件夹Android图片的图库我找到了一个有效的代码但是当我在项目中添加此代码时，活动崩溃
这是Java代码：
package com.dvp.android.gallery;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
/**
* @author Micka�l Le Trocquer
*/
public class Galeries extends Activity {
//Adresse o� se trouve l'ensemble des images gif (num�rot�es de 1 � 21).
private final static String SERVER_IM = "http://10.0.2.2/www/Bardo/images/Galerie/";
// GUI
private Gallery gallery;
private ImageView imgView;
//Data
private ArrayList<URL> mListImages;
private Drawable mNoImage;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.galeries);
//R�cup�ration d'une image par d�faut � afficher en cas d'erreur ou de liste vide
mNoImage = this.getResources().getDrawable(R.drawable.no_photo);
//Construction des URL pour les images
mListImages = buildListImages();
//R�cup�ration du composant affichant l'image en grand
imgView = (ImageView)findViewById(R.id.imageview);
//On lui met une image par d�faut (la premiere de la liste ou � d�faut l'image d'erreur)
if (mListImages.size() <= 0) {
imgView.setImageDrawable(mNoImage);
} else {
try {
setImage(imgView, mListImages.get(0));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//R�cup�ration du composant affichant la liste des vignettes
gallery = (Gallery) findViewById(R.id.gallery);
//On lui donne notre adapter qui s'occup�ra de l'alimenter en vignette
gallery.setAdapter(new AddImgAdp(this));
//Espacement entre les vignette
gallery.setSpacing(10);
//Lors d'un clic sur une des vignettes, on affiche l'image correspondante en grand
gallery.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, final int position, long id) {
new Thread(new Runnable() {
public void run() {
try {
setImage(imgView, mListImages.get(position));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}).start();
}
});
}
/**
* Permet de construire la liste des urls pour les images
* @return
*/
private ArrayList<URL> buildListImages() {
int nbTotalImage = 21;
ArrayList<URL> listFic = new ArrayList<URL>();
for(int i = 1; i <= nbTotalImage; i++) {
try {
listFic.add(new URL(SERVER_IM + "/" + i + ".gif"));
} catch (MalformedURLException e) {
Log.e("DVP Gallery", "Erreur format URL : " + SERVER_IM + "/" + i + ".gif");
e.printStackTrace();
}
}
return listFic;
}
/**
* Notre adapter qui g�re la liste des vignettes
* @author Micka�l Le Trocquer
*/
public class AddImgAdp extends BaseAdapter {
int GalItemBg;
private Context cont;
public AddImgAdp(Context c) {
cont = c;
TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);
GalItemBg = typArray.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0);
typArray.recycle();
}
public int getCount() {
return mListImages.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ImageView imgView = null;
//R�cyclage du composant
if (convertView == null) {
imgView = new ImageView(cont);
} else {
imgView = (ImageView)convertView;
}
//On affecte notre image � la vignette
if (mListImages.size() <= 0) {
imgView.setImageDrawable(mNoImage);
} else {
try {
setImage(imgView, mListImages.get(position));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//On d�fini la taille de l'image
imgView.setLayoutParams(new Gallery.LayoutParams(150, 150));
imgView.setScaleType(ImageView.ScaleType.FIT_XY);
//On fixe un arri�re plan plus sympa
imgView.setBackgroundResource(GalItemBg);
return imgView;
}
}
/**
* M�thode permettant de t�l�charger une image depuis une URL et de l'affecter � un composant de type ImageView
* @param aView
* @param aURL
*/
public void setImage(ImageView aView, final URL aURL) throws IOException {
final Bitmap bm = null;
AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
URLConnection conn = null;
try {
conn = aURL.openConnection();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
conn.connect();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
InputStream is = null;
try {
is = conn.getInputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Bufferisation pour le t�l�chargement
BufferedInputStream bis = new BufferedInputStream(is, 8192);
// Cr�ation de l'image depuis le flux des donn�es entrant
Bitmap bm = BitmapFactory.decodeStream(bis);
try {
bis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
};
task.execute(null, null, null);
// Fixe l'image sur le composant ImageView
aView.setImageBitmap(bm);
}
}
logcat输出
09-27 17:33:22.719: E/AndroidRuntime(2016): FATAL EXCEPTION: Thread-171
09-27 17:33:22.719: E/AndroidRuntime(2016): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
09-27 17:33:22.719: E/AndroidRuntime(2016): at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:5908)
09-27 17:33:22.719: E/AndroidRuntime(2016): at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:869)
09-27 17:33:22.719: E/AndroidRuntime(2016): at android.view.ViewGroup.invalidateChild(ViewGroup.java:4253)
09-27 17:33:22.719: E/AndroidRuntime(2016): at android.view.View.invalidate(View.java:10539)
09-27 17:33:22.719: E/AndroidRuntime(2016): at android.view.View.invalidate(View.java:10494)
09-27 17:33:22.719: E/AndroidRuntime(2016): at android.widget.ImageView.setImageDrawable(ImageView.java:424)
09-27 17:33:22.719: E/AndroidRuntime(2016): at android.widget.ImageView.setImageBitmap(ImageView.java:437)
09-27 17:33:22.719: E/AndroidRuntime(2016): at com.dvp.android.gallery.Galeries.setImage(Galeries.java:231)
09-27 17:33:22.719: E/AndroidRuntime(2016): at com.dvp.android.gallery.Galeries$1$1.run(Galeries.java:83)
09-27 17:33:22.719: E/AndroidRuntime(2016): at java.lang.Thread.run(Thread.java:841)
09-27 17:33:22.719: E/SoundPool(289): error loading /system/media/audio/ui/KeypressReturn.ogg
我用Google搜索，没有找到有关此例外的信息。我真的很困惑这个问题，不知道如何解决它。有谁知道如何解决它？感谢。
答案 0 :(得分：0)
清楚地写道，您正在主线程上进行网络操作，这是不允许的。您可以考虑使用async或创建自己的runnables以在后台运行。 您可以使用Universal Loader
08-29 10:43:21.756: E/AndroidRuntime(1991): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.Bardo/com.example.Bardo.Galeries}: android.os.NetworkOnMainThreadException