我使用了Webservice并获取了数据。我使用了Custom lisatview。我在图像按钮中设置图像。但我向上滚动然后应用程序崩溃。我的代码如下。
public class HomeFragment extends Fragment {
ListView lv;
ArrayList<All_list_home_dto> list = new ArrayList<All_list_home_dto>();
MyListAdapter adt;
All_list_home_dto list_home;
String cityName;
View rootView;
private static final long DOUBLE_PRESS_INTERVAL = 250; // in millis
private long lastPressTime;
boolean mHasDoubleClicked;
private ProgressDialog progress;
MyApplication app;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.home, container, false);
app = (MyApplication) getActivity().getApplicationContext();
lv = (ListView) rootView.findViewById(R.id.home_listview);
cityName = getActivity().getIntent().getExtras().getString("cityName")
.toString();
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
if (cityName.trim().equals("")) {
Toast.makeText(getActivity().getApplicationContext(),
" No City Name Available ", Toast.LENGTH_LONG).show();
} else {
progress = new ProgressDialog(getActivity());
progress.setMessage("Loading...");
new JSONTask(progress).execute("Home");
}
return rootView;
}
public class JSONTask extends AsyncTask<String, Void, String> {
public JSONTask(ProgressDialog progress) {
progress = progress;
}
public void onPreExecute() {
progress.show();
}
@Override
protected String doInBackground(String... arg) {
String listSize = "";
Log.v("log_tag", "list DoinBaCK ");
list = DBAdpter.getNewsData(cityName);
Log.v("log_tag", "list_size :: " + list.size());
listSize = list.size() + "";
return listSize; // This value will be returned to your
// onPostExecute(result) method
}
@Override
protected void onPostExecute(String result) {
// Create here your JSONObject...
Log.v("log_tag", "list ON Post");
if (Integer.parseInt(result) > 0) {
adt = new MyListAdapter(getActivity());
lv.setAdapter(adt);
} else {
Toast.makeText(getActivity().getApplicationContext(),
" No Stroe Data Available ", Toast.LENGTH_LONG).show();
}
progress.dismiss();
}
// You'll have to override this method on your other tasks that extend
// from this one and use your JSONObject as needed
}
public class MyListAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public MyListAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return list.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) {
convertView = mInflater.inflate(R.layout.custom_home_list, null);
ImageButton home_ic_img = (ImageButton) convertView
.findViewById(R.id.list_home_logo_image);
ImageButton home_big_img = (ImageButton) convertView
.findViewById(R.id.sarees_big_img);
TextView home_username_txt = (TextView) convertView
.findViewById(R.id.home_list_username);
TextView home_view_txt = (TextView) convertView
.findViewById(R.id.home_view_txt_view);
TextView itemName_txt = (TextView) convertView
.findViewById(R.id.itemName_txt);
Button close_btn = (Button) convertView
.findViewById(R.id.close_home_btn);
home_username_txt.setText(list.get(position).store_name.toString());
home_view_txt.setText("Views: "
+ list.get(position).views.toString());
itemName_txt.setText(list.get(position).name.toString());
final String uid = app.getUserID();
if (list.get(position).image.toString().trim().equals("")) {
Log.v("log_tag", "image :::: ");
home_big_img.setImageResource(R.drawable.ic_launcher);
} else {
byte[] Image_getByte;
try {
Image_getByte = Base64.decode(list.get(position).image);
ByteArrayInputStream bytes = new ByteArrayInputStream(
Image_getByte);
BitmapDrawable bmd = new BitmapDrawable(bytes);
Bitmap bm = bmd.getBitmap();
home_big_img.setImageBitmap(bm);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (list.get(position).picture.toString().trim().equals("")) {
Log.v("log_tag", "picture :::: " );
home_ic_img.setImageResource(R.drawable.ic_launcher);
} else {
byte[] Image_getByte1;
try {
Image_getByte1 = Base64.decode(list.get(position).picture);
ByteArrayInputStream bytes1 = new ByteArrayInputStream(
Image_getByte1);
BitmapDrawable bmd1 = new BitmapDrawable(bytes1);
Bitmap bm1 = bmd1.getBitmap();
home_ic_img.setImageBitmap(bm1);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
home_big_img.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
findDoubleClick(list.get(position).store_id,
list.get(position).item_id);
if (mHasDoubleClicked) {
String msg = DBAdpter.userClosestStore(
list.get(position).item_id,
list.get(position).store_id, uid);
Toast.makeText(getActivity().getApplicationContext(),
msg, 1).show();
}
}
});
close_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String msg = DBAdpter.userClosestStore(
list.get(position).item_id,
list.get(position).store_id, uid);
Toast.makeText(getActivity().getApplicationContext(), msg,
1).show();
}
});
return convertView;
}
}
private boolean findDoubleClick(final String str_id, final String itemId) {
// Get current time in nano seconds.
long pressTime = System.currentTimeMillis();
// If double click...
if (pressTime - lastPressTime <= DOUBLE_PRESS_INTERVAL) {
mHasDoubleClicked = true;
// double click event....
} else { // If not double click....
mHasDoubleClicked = false;
Handler myHandler = new Handler() {
public void handleMessage(Message m) {
if (!mHasDoubleClicked) {
// single click event
FragmentManager fm = getFragmentManager();
FragmentTransaction fragmentTransaction = fm
.beginTransaction();
StoreDetailFragment fm2 = new StoreDetailFragment();
fragmentTransaction.replace(R.id.rela_home_fragment,
fm2, "HELLO");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
Bundle bundle = new Bundle();
bundle.putString("position", str_id);
fm2.setArguments(bundle);
DBAdpter.updateItemView(itemId);
}
}
};
Message m = new Message();
myHandler.sendMessageDelayed(m, DOUBLE_PRESS_INTERVAL);
}
lastPressTime = pressTime;
return mHasDoubleClicked;
}
}
获取错误：
03-20 18:26:20.819: E/AndroidRuntime(7041): FATAL EXCEPTION: main
03-20 18:26:20.819: E/AndroidRuntime(7041): java.lang.OutOfMemoryError
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:623)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:695)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.graphics.drawable.BitmapDrawable.<init>(BitmapDrawable.java:152)
03-20 18:26:20.819: E/AndroidRuntime(7041): at com.marketplacestore.fragment.HomeFragment$MyListAdapter.getView(HomeFragment.java:207)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.widget.AbsListView.obtainView(AbsListView.java:2570)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.widget.ListView.makeAndAddView(ListView.java:1838)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.widget.ListView.fillDown(ListView.java:681)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.widget.ListView.fillGap(ListView.java:645)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.widget.AbsListView.trackMotionScroll(AbsListView.java:6464)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3642)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.widget.AbsListView.onTouchEvent(AbsListView.java:4456)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.View.dispatchTouchEvent(View.java:7669)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2395)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
03-20 18:26:20.819: E/AndroidRuntime(7041): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2284)
03-20 18:26:20.819: E/AndroidRuntime(7041): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1578)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.app.Activity.dispatchTouchEvent(Activity.java:2468)
03-20 18:26:20.819: E/AndroidRuntime(7041): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2232)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.View.dispatchPointerEvent(View.java:7876)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3894)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3778)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5030)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5009)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5107)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:174)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:5080)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5126)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:791)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.Choreographer.doCallbacks(Choreographer.java:591)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.Choreographer.doFrame(Choreographer.java:559)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:777)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.os.Handler.handleCallback(Handler.java:725)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.os.Handler.dispatchMessage(Handler.java:92)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.os.Looper.loop(Looper.java:137)
03-20 18:26:20.819: E/AndroidRuntime(7041): at android.app.ActivityThread.main(ActivityThread.java:5283)
03-20 18:26:20.819: E/AndroidRuntime(7041): at java.lang.reflect.Method.invokeNative(Native Method)
03-20 18:26:20.819: E/AndroidRuntime(7041): at java.lang.reflect.Me
答案 0 :(得分：0)
首先，你的getView方法对UI线程做了太多工作。
例如
Image_getByte = Base64.decode(list.get(position).image);
ByteArrayInputStream bytes = new ByteArrayInputStream(
Image_getByte);
BitmapDrawable bmd = new BitmapDrawable(bytes);
Bitmap bm = bmd.getBitmap();
您应该使用任务来处理图像，然后将图像缓存在LRUCache中。 这link should be helpful
另外，您应该观看google io 2009
的视频它向您展示了如何回收视图，使用ViewHolder来避免每次调用getView时调用使用的findViewById（）...
以下是如何实现视图持有者的示例：
/** Holder pattern to recycle your view **/
public static class ViewHolder {
public ImageButton home_ic_img;
public ImageButton home_big_img;
public TextView home_username_txt;
and so on..
}
public View getView(final int position, View convertView,
ViewGroup parent) {
if (convertView != null && convertView.getTag() instanceof ViewHolder) {
holder = (ViewHolder) convertView.getTag(); //reuse the "cached" view
} else {
convertView = mInflater.inflate(R.layout.custom_home_list, parent, false);
holder = new ViewHolder();
holder.home_ic_img = (ImageButton) convertView.findViewById(R.id.list_home_logo_image);
holder.home_big_img = convertView.findViewById(R.id.sarees_big_img);
holder.home_username_txt = (TextView) convertView .findViewById(R.id.home_list_username);
and so on..
convertView.setTag(holder); //most important thing.. it "caches" your view
}
....
return convertView;
}
}
但是，我强烈建议您观看视频以了解它是如何运作的。
希望这有帮助
答案 1 :(得分：0)
我建议您使用Aquery下载images.just从下面链接下载jarfile
https://code.google.com/p/android-query/downloads/detail?name=android-query.0.26.7.jar
并使用
调用此方法AQuery _aq = new AQuery(youractivity context);
//从互联网上获取并设置图像，使用文件和内存进行缓存
aq.id(R.id.Your imageview object).image("http://www.vikispot.com/z/images/vikispot/android-w.png");