だから私は返されたjson配列からずらしたグリッドビューに画像をロードしようとしています。例のようにリンクを配列に直接配置することを既にテストしており、完全に機能しますが、json データを使用しようとすると、エラーが発生します (ネットワーク エラーとストレージ エラーの両方)。 、インターネット、内部および外部ストレージ)
これが私のコードです。何が問題なのか誰か教えてください。ありがとう！！
package com.example.staggeredgridviewdemo;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import com.origamilabs.library.views.StaggeredGridView;
/**
*
* This will not work so great since the heights of the imageViews are
* calculated on the iamgeLoader callback ruining the offsets. To fix this try
* to get the (intrinsic) image width and height and set the views height
* manually. I will look into a fix once I find extra time.
*
* @author Maurycy Wojtowicz
*
*/
public class MainActivity extends Activity {
/*
* Images are taken by Romain Guy ! He's a great photographer as well as a
* great programmer. http://www.flickr.com/photos/romainguy
*/
private String urls[];
String location = "http://snapoodle.com/APIS/android/feed.php";
static final String TAG_ITEMS = "print";
/*
* private String urls[] = {
* "http://farm7.staticflickr.com/6101/6853156632_6374976d38_c.jpg",
* "http://farm8.staticflickr.com/7084/6885444694_6272874cfc.jpg" };
*/
/**
* This will not work so great since the heights of the imageViews are
* calculated on the iamgeLoader callback ruining the offsets. To fix this
* try to get the (intrinsic) image width and height and set the views
* height manually. I will look into a fix once I find extra time.
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
StaggeredGridView gridView = (StaggeredGridView) this
.findViewById(R.id.staggeredGridView1);
getImages get= (getImages) new getImages();
get.execute(location);
//int margin = getResources().getDimensionPixelSize(R.dimen.margin);
//gridView.setItemMargin(margin); // set the GridView margin
//gridView.setPadding(margin, 0, margin, 0); // have the margin on the
// sides as well
StaggeredAdapter adapter = new StaggeredAdapter(MainActivity.this,
R.id.imageView1, urls);
gridView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
class getImages extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
JSONObject json = JSONfunctions
.getJSONfromURL(location);
try {
JSONArray jarray;
jarray = json.getJSONArray(TAG_ITEMS);
urls = new String[jarray.length()];
for (int i = 0; i < jarray.length(); i++) {
JSONObject gridImages = jarray.getJSONObject(i);
urls[i] = gridImages.getString("saved_location");
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
}
ログキャット
03-22 14:57:59.276: D/AndroidRuntime(1183): Shutting down VM
03-22 14:57:59.276: W/dalvikvm(1183): threadid=1: thread exiting with uncaught exception (group=0x4111f930)
03-22 14:57:59.286: E/AndroidRuntime(1183): FATAL EXCEPTION: main
03-22 14:57:59.286: E/AndroidRuntime(1183): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.staggeredgridviewdemo/com.example.staggeredgridviewdemo.MainActivity}: java.lang.NullPointerException: storage == null
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.os.Handler.dispatchMessage(Handler.java:99)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.os.Looper.loop(Looper.java:137)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.app.ActivityThread.main(ActivityThread.java:5041)
03-22 14:57:59.286: E/AndroidRuntime(1183): at java.lang.reflect.Method.invokeNative(Native Method)
03-22 14:57:59.286: E/AndroidRuntime(1183): at java.lang.reflect.Method.invoke(Method.java:511)
03-22 14:57:59.286: E/AndroidRuntime(1183): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-22 14:57:59.286: E/AndroidRuntime(1183): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-22 14:57:59.286: E/AndroidRuntime(1183): at dalvik.system.NativeStart.main(Native Method)
03-22 14:57:59.286: E/AndroidRuntime(1183): Caused by: java.lang.NullPointerException: storage == null
03-22 14:57:59.286: E/AndroidRuntime(1183): at java.util.Arrays$ArrayList.<init>(Arrays.java:38)
03-22 14:57:59.286: E/AndroidRuntime(1183): at java.util.Arrays.asList(Arrays.java:154)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.widget.ArrayAdapter.<init>(ArrayAdapter.java:128)
03-22 14:57:59.286: E/AndroidRuntime(1183): at com.example.staggeredgridviewdemo.StaggeredAdapter.<init>(StaggeredAdapter.java:20)
03-22 14:57:59.286: E/AndroidRuntime(1183): at com.example.staggeredgridviewdemo.MainActivity.onCreate(MainActivity.java:89)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.app.Activity.performCreate(Activity.java:5104)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
03-22 14:57:59.286: E/AndroidRuntime(1183): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
03-22 14:57:59.286: E/AndroidRuntime(1183): ... 11 more
03-22 14:57:59.316: D/dalvikvm(1183): GC_CONCURRENT freed 176K, 3% free 8878K/9084K, paused 3ms+1ms, total 19ms