问题
I need your help. My App works fine on GingerBread, but on ICS and HC crash. This is the logcat
01-14 20:26:51.831: E/AndroidRuntime(698): FATAL EXCEPTION: main
01-14 20:26:51.831: E/AndroidRuntime(698): android.os.NetworkOnMainThreadException
01-14 20:26:51.831: E/AndroidRuntime(698): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
01-14 20:26:51.831: E/AndroidRuntime(698): at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
01-14 20:26:51.831: E/AndroidRuntime(698): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
01-14 20:26:51.831: E/AndroidRuntime(698): at java.net.InetAddress.getAllByName(InetAddress.java:220)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:71)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpEngine.connect(HttpEngine.java:303)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
01-14 20:26:51.831: E/AndroidRuntime(698): at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
01-14 20:26:51.831: E/AndroidRuntime(698): at com.bozz.milaircraft.f23$ImageAdapter.getView(f23.java:125)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:192)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.View.measure(View.java:12723)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.View.measure(View.java:12723)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.View.measure(View.java:12723)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.View.measure(View.java:12723)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.View.measure(View.java:12723)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.View.measure(View.java:12723)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.View.measure(View.java:12723)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.View.measure(View.java:12723)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
01-14 20:26:51.831: E/AndroidRuntime(698): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2092)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.View.measure(View.java:12723)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1064)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.os.Handler.dispatchMessage(Handler.java:99)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.os.Looper.loop(Looper.java:137)
01-14 20:26:51.831: E/AndroidRuntime(698): at android.app.ActivityThread.main(ActivityThread.java:4424)
01-14 20:26:51.831: E/AndroidRuntime(698): at java.lang.reflect.Method.invokeNative(Native Method)
01-14 20:26:51.831: E/AndroidRuntime(698): at java.lang.reflect.Method.invoke(Method.java:511)
01-14 20:26:51.831: E/AndroidRuntime(698): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-14 20:26:51.831: E/AndroidRuntime(698): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-14 20:26:51.831: E/AndroidRuntime(698): at dalvik.system.NativeStart.main(Native Method)
Here is the layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/linearLayout3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#000"
android:paddingBottom="5dp"
android:paddingTop="5dp" >
<Button
android:id="@+id/homebutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="@drawable/homebutton" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:text="@string/nomeF22Raptor"
android:textColor="#FFD800"
android:textSize="22dp"
android:textStyle="bold" />
<Button
android:id="@+id/searchbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="@drawable/searchbutton" >
</Button>
</LinearLayout>
<TabHost
android:id="@+id/tabhost"
android:layout_width="match_parent"
android:layout_height="420dp"
android:layout_weight="0.80"
android:background="@drawable/background" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TabWidget
android:id="@android:id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</TabWidget>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/tab1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ScrollView
android:id="@+id/ScrollView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/datiF22Raptor" />
</LinearLayout>
</ScrollView>
</LinearLayout>
<LinearLayout
android:id="@+id/tab2"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ScrollView
android:id="@+id/ScrollView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/cartecF22Raptor" />
</LinearLayout>
</ScrollView>
</LinearLayout>
<LinearLayout
android:id="@+id/tab3"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ScrollView
android:id="@+id/ScrollView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/utilizzatoriF22Raptor" />
</LinearLayout>
</ScrollView>
</LinearLayout>
<LinearLayout
android:id="@+id/tab4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Gallery
android:id="@+id/gallery"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
<ImageView
android:id="@+id/ImageView01"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_gravity="center" >
</ImageView>
</LinearLayout>
</FrameLayout>
</LinearLayout>
</TabHost>
</LinearLayout>
and this is the java code
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
public class f23 extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.f23);
Button bhome = (Button) findViewById(R.id.homebutton);
bhome.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent("com.bozz.milaircraft.MENU"));
}
});
TabHost th = (TabHost) findViewById(R.id.tabhost);
th.setup();
TabSpec specs = th.newTabSpec("tag1");
specs.setContent(R.id.tab1);
specs.setIndicator("BRIEFING");
th.addTab(specs);
specs = th.newTabSpec("tag2");
specs.setContent(R.id.tab2);
specs.setIndicator("DESIGN");
th.addTab(specs);
specs = th.newTabSpec("tag3");
specs.setContent(R.id.tab3);
specs.setIndicator("USERS");
th.addTab(specs);
specs = th.newTabSpec("tag4");
specs.setContent(R.id.tab4);
specs.setIndicator("GALLERY");
th.addTab(specs);
Gallery ga = (Gallery) findViewById(R.id.gallery);
ga.setAdapter(new ImageAdapter(this));
}
public class ImageAdapter extends BaseAdapter {
/** The parent context */
private Context myContext;
int imageBackground;
/** URL-Strings to some remote images. */
private String[] myRemoteImages = {
"http://www.medicinarozzano.it/images/milair/f4_1.jpg",
"http://www.medicinarozzano.it/images/milair/f4_2.jpg",
"http://www.medicinarozzano.it/images/milair/f4_3.jpg",
"http://www.medicinarozzano.it/images/milair/f4_4.jpg",
"http://www.medicinarozzano.it/images/milair/f4_5.jpg",
"http://www.medicinarozzano.it/images/milair/f4_6.jpg",
"http://www.medicinarozzano.it/images/milair/f4_7.jpg",
"http://www.medicinarozzano.it/images/milair/f4_8.jpg",
"http://www.medicinarozzano.it/images/milair/f4_9.jpg",
"http://www.medicinarozzano.it/images/milair/f4_10.jpg"};
/** Simple Constructor saving the 'parent' context. */
public ImageAdapter(Context c) {
this.myContext = c;
}
/** Returns the amount of images we have defined. */
public int getCount() {
return this.myRemoteImages.length;
}
/* Use the array-Positions as unique IDs */
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
/**
* Returns a new ImageView to be displayed, depending on the position
* passed.
*/
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(this.myContext);
try {
/* Open a new URL and get the InputStream to load data from it. */
URL aURL = new URL(myRemoteImages[position]);
URLConnection conn = aURL.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
/* Buffered is always good for a performance plus. */
BufferedInputStream bis = new BufferedInputStream(is);
/* Decode url-data to a bitmap. */
Bitmap bm = BitmapFactory.decodeStream(bis);
bis.close();
is.close();
/* Apply the Bitmap to the ImageView that will be returned. */
i.setImageBitmap(bm);
} catch (IOException e) {
i.setImageResource(R.drawable.f4_1);
Log.e("DEBUGTAG", "Remote Image Exception", e);
}
/* Image should be scaled as width/height are set. */
i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
/* Set the Width/Height of the ImageView. */
i.setLayoutParams(new Gallery.LayoutParams(480, 640));
return i;
}
/**
* Returns the size (0.0f to 1.0f) of the views depending on the
* 'offset' to the center.
*/
public float getScale(boolean focused, int offset) {
/* Formula: 1 / (2 ^ offset) */
return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
}
}
}
The App crash when I click on the Gallery Tab.
回答1:
It is a bad idea to perform (potentially blocking) network operations on your app's main thread, which is what you are doing. Before Honeycomb (Android 3.0), it was just a bad idea. From Android 3.0 onwards, it is prohibited, and you receive this exception if you try to do so.
See http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html
You need to farm out this network logic to a separate asynchronous thread. Or, look at a Handler. You're going to need to change your code architecture; no easy fix.
回答2:
In Honeycomb networking is not allowed on the UI thread. The reason is that it slows down the user interface (UI).
Instead try to download your images in an background thread, the easiest way to implement this is using an AsyncTask.
回答3:
Use it at your own risk:
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll()
.build();
StrictMode.setThreadPolicy(policy);
Resource: http://developer.android.com/reference/android/os/StrictMode.ThreadPolicy.Builder.html
回答4:
You can see the version of the OS, and execute a code depending of it.
For example:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD)
回答5:
This is how I solve the problem:
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
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.Button;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.TabHost.TabSpec;
public class f24 extends Activity {
private ImageAdapter imageAdapter;
private ArrayList<String> PhotoURLS = new ArrayList<String>();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.f24);
Button bhome = (Button) findViewById(R.id.homebutton);
bhome.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent ("com.bozz.milaircraft.MENU"));
}
});
TabHost th = (TabHost) findViewById(R.id.tabhost);
th.setup();
TabSpec specs = th.newTabSpec("tag1");
specs.setContent(R.id.tab1);
specs.setIndicator("BRIEFING");
th.addTab(specs);
specs = th.newTabSpec("tag2");
specs.setContent(R.id.tab2);
specs.setIndicator("DESIGN");
th.addTab(specs);
specs = th.newTabSpec("tag3");
specs.setContent(R.id.tab3);
specs.setIndicator("USERS");
th.addTab(specs);
specs = th.newTabSpec("tag4");
specs.setContent(R.id.tab4);
specs.setIndicator("GALLERY");
th.addTab(specs);
imageAdapter = new ImageAdapter(this);
final ImageView imgView = (ImageView) findViewById(R.id.GalleryView);
Gallery g = (Gallery) findViewById(R.id.Gallery);
g.setAdapter(imageAdapter);
g.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
imgView.setImageDrawable(LoadImageFromURL(PhotoURLS
.get(position)));
imgView.setScaleType(ImageView.ScaleType.FIT_CENTER);
}
});
// replace this code to set your image urls in list
PhotoURLS.add("http://www.medicinarozzano.it/images/milair/f4_1.jpg");
PhotoURLS.add("http://www.medicinarozzano.it/images/milair/f4_1.jpg");
new AddImageTask().execute();
}
class AddImageTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... unused) {
for (String url : PhotoURLS) {
String filename = url.substring(url.lastIndexOf("/") + 1,
url.length());
filename = "th_" + filename;
String thumburl = url.substring(0, url.lastIndexOf("/") + 1);
imageAdapter.addItem(LoadThumbnailFromURL(thumburl + filename));
publishProgress();
//SystemClock.sleep(200);
}
return (null);
}
@Override
protected void onProgressUpdate(Void... unused) {
imageAdapter.notifyDataSetChanged();
}
@Override
protected void onPostExecute(Void unused) {
}
}
private Drawable LoadThumbnailFromURL(String url) {
try {
URLConnection connection = new URL(url).openConnection();
String contentType = connection.getHeaderField("Content-Type");
boolean isImage = contentType.startsWith("image/");
if(isImage){
HttpGet httpRequest = new HttpGet(url);
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = (HttpResponse) httpclient
.execute(httpRequest);
HttpEntity entity = response.getEntity();
BufferedHttpEntity bufferedHttpEntity = new BufferedHttpEntity(entity);
InputStream is = bufferedHttpEntity.getContent();
Drawable d = Drawable.createFromStream(is, "src Name");
return d;
} else {
Bitmap b = BitmapFactory.decodeResource(getResources(), R.drawable.no_image);
Drawable d = new BitmapDrawable(b);
return d;
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_LONG)
.show();
Log.e(e.getClass().getName(), e.getMessage(), e);
return null;
}
}
private Drawable LoadImageFromURL(String url) {
try {
URLConnection connection = new URL(url).openConnection();
String contentType = connection.getHeaderField("Content-Type");
boolean isImage = contentType.startsWith("image/");
if(isImage){
HttpGet httpRequest = new HttpGet(url);
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = (HttpResponse) httpclient
.execute(httpRequest);
HttpEntity entity = response.getEntity();
BufferedHttpEntity bufferedHttpEntity = new BufferedHttpEntity(
entity);
InputStream is = bufferedHttpEntity.getContent();
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(is, null, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 150;
// Find the correct scale value. It should be the power of 2.
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// Decode with inSampleSize
is = bufferedHttpEntity.getContent();
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
Bitmap b = BitmapFactory.decodeStream(is, null, o2);
Drawable d = new BitmapDrawable(b);
return d;
} else {
Bitmap b = BitmapFactory.decodeResource(getResources(), R.drawable.no_image);
Drawable d = new BitmapDrawable(b);
return d;
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_LONG)
.show();
Log.e(e.getClass().getName(), e.getMessage(), e);
return null;
}
}
public class ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
private Context mContext;
ArrayList<Drawable> drawablesFromUrl = new ArrayList<Drawable>();
public ImageAdapter(Context c) {
mContext = c;
TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
mGalleryItemBackground = a.getResourceId(
R.styleable.Gallery1_android_galleryItemBackground, 0);
a.recycle();
}
public void addItem(Drawable item) {
drawablesFromUrl.add(item);
}
public int getCount() {
return drawablesFromUrl.size();
}
public Drawable getItem(int position) {
return drawablesFromUrl.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(mContext);
i.setImageDrawable(drawablesFromUrl.get(position));
i.setLayoutParams(new Gallery.LayoutParams(150, 120));
i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
i.setBackgroundResource(mGalleryItemBackground);
return i;
}
}
}
But now I have another problem:
If i don not declare any SDK on Android Manifest, the app works perfectly on both gingerbread and HC, and ICS. However, if i declare a minimum SDK greater than 1 or TargetSDK, the app works fine on gingerbread but not on HC and ISC. When i click on an image in the gallery nothing appears on the image viewer. Yet, a toast error pops up.
Also, if there is no internet connection the app crashes.
Best regards Tiberio Bozotti
EDIT: i could remove the SDK but on honeycomb it is not clear. Meaning that the layout is not compatible.
来源：https://stackoverflow.com/questions/8865213/my-app-works-on-gingerbread-crash-on-ics-and-hc