公共类Gallery_fragment扩展了FragmentActivity {
public static Database db;
public static ArrayAdapter adapter;
public static ArrayList<StructureImage> images = new ArrayList<StructureImage>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.gallery);
ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
PagerAdapter adpter2 = new PagerAdapter(this, getSupportFragmentManager());
viewPager.setAdapter(adpter2);
adapter = new AdapterImage(images);
this.db = new Database(this);
db.database();
getImageListFromServer();
}//end oncreate
private void getImageListFromServer() {
String result = Webservice.readUrl("http://192.168.1.100/file-server/service.php", null);
if (result != null) {
try {
db.open();
JSONArray tasks = new JSONArray(result);
String[] array_1 = new String[100];
for (int i1 = 0; i1 < db.count_gallery(); i1++) {
array_1[i1] = db.Display_gallery(i1, 0);
}
for (int i = 0; i < tasks.length(); i++) {
JSONObject object = tasks.getJSONObject(i);
String id = object.getString("id");
String title = object.getString("title");
String tozihat = object.getString("tozihat");
String thumbnail = object.getString("thumbnail");
int pars = Integer.parseInt(id);
Log.i("LOG", "i=" + i);
if (Arrays.asList(array_1).contains(id)) {
Log.i("LOG", "NO ! new Record");
} else {//new id}
db.inser_gallery(pars, title, tozihat, thumbnail);
}
}
}
catch (JSONException e) {
e.printStackTrace();
}
}
db.close();
fill_listview();
}
private void fill_listview() {
images.clear();
G.pagenumber.clear();
G.imageIds.clear();
G.imageTitles.clear();
G.filenaming.clear();
db.open();
G.dbcountposition = db.count_gallery();
for (int i = 0; i < db.count_gallery(); i++) {
StructureImage image = new StructureImage();
image.id = db.Display_gallery(i, 0);
image.title = db.Display_gallery(i, 1);
image.tozihat = db.Display_gallery(i, 2);
image.thumbnail = db.Display_gallery(i, 3);
// Start - add for view pager
int imageId = G.context.getResources().getIdentifier("image" + db.Display_gallery(i, 0), "drawable", G.context.getPackageName());
Log.i("LOG", "image id: " + imageId);
G.pagenumber.add(i);
G.imageIds.add(imageId);
G.imageTitles.add("" + db.Display_gallery(i, 1));
G.filenaming.add("" + db.Display_gallery(i, 3));
// End
int pp = Integer.parseInt(db.Display_gallery(i, 0));
Log.i("LOG2", pp + "--- 1");
if (pp > 17) {
Log.i("LOG2", "image.thumbnail" + image.thumbnail);
DownloadManager.addToDownloadList(image.thumbnail);
}
images.add(image);
}
Collections.sort(images);
Collections.reverse(images);
adapter.notifyDataSetChanged();
db.close();
}
}
FragmentA类：
public class FragmentA extends Fragment {
private ViewGroup layout;
public static ArrayList<StructureImage> images = new ArrayList<StructureImage>();
public ArrayAdapter adapter;
public static Database db;
private View view;
public static Fragment instance(int catId) {
Fragment fragment = new FragmentA();
Bundle data = new Bundle();
data.putInt("catId", catId);
fragment.setArguments(data);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.db = new Database(getActivity());
db.database();
GridView list = (GridView) layout.findViewById(R.id.list);
adapter = new AdapterImage(images);
list.setAdapter(adapter);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
layout = (ViewGroup) inflater.inflate(R.layout.fragment_a, null);
return layout;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
我的错误：
08-27 20:59:58.832: E/AndroidRuntime(9586): FATAL EXCEPTION: main
08-27 20:59:58.832: E/AndroidRuntime(9586): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.aradmobile.gol/com.aradmobile.gol.Gallery_fragment}: java.lang.NullPointerException
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.os.Handler.dispatchMessage(Handler.java:99)
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.os.Looper.loop(Looper.java:137)
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.app.ActivityThread.main(ActivityThread.java:5041)
08-27 20:59:58.832: E/AndroidRuntime(9586): at java.lang.reflect.Method.invokeNative(Native Method)
08-27 20:59:58.832: E/AndroidRuntime(9586): at java.lang.reflect.Method.invoke(Method.java:511)
08-27 20:59:58.832: E/AndroidRuntime(9586): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-27 20:59:58.832: E/AndroidRuntime(9586): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-27 20:59:58.832: E/AndroidRuntime(9586): at dalvik.system.NativeStart.main(Native Method)
08-27 20:59:58.832: E/AndroidRuntime(9586): Caused by: java.lang.NullPointerException
08-27 20:59:58.832: E/AndroidRuntime(9586): at com.aradmobile.gol.Gallery_fragment.onCreate(Gallery_fragment.java:45)
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.app.Activity.performCreate(Activity.java:5104)
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
08-27 20:59:58.832: E/AndroidRuntime(9586): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
08-27 20:59:58.832: E/AndroidRuntime(9586): ... 11 more