图片廊不显示任何东西 [英] Image Gallery does not show anything
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问题描述
我有一个问题，在做图片库。我从网络上检索。问题是，该图像不能够在画廊设置。我知道我可能会在某个地方做一些愚蠢的错误。任何人都可以请帮我这。
i have a problem while doing Photo gallery. I am retrieving the from the network. The problem is that the images are not been able to set in the gallery. I know i might be doing some silly mistake somewhere. Can anyone please help me with this.
下面是我的更新时间是code：
Here is my UPDATED code:
MainActivity.java
MainActivity.java
public class MainActivity extends Activity implements OnItemClickListener {
String FILENAME = "http://122.com/12.php";
private static final String tag = "Main";
private static String carId = "";
private Gallery _gallery;
private ImageAdapter _imageAdapter;
static String j_img1 = null;
static String j_img2 = null;
static String j_img3 = null;
static String j_img4 = null;
ImageView img1;
Bitmap decodedByte;
SharedPreferences sp;
String s_id, is, str;
ArrayList<HashMap<String, String>> ImageList = new ArrayList<HashMap<String, String>>();
static ArrayList<Bitmap> bitimg = new ArrayList<Bitmap>();
// static ArrayList<Bitmap> img = new ArrayList<Bitmap>();
private static final String IMAGE1 = "img";
private static final String IMAGE2 = "img2";
private static final String IMAGE3 = "img3";
private static final String IMAGE4 = "img4";
/** Called when the activity is first created. */
public void getcarid(String car_id) {
// TODO Auto-generated method stub
carId = car_id;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setTitle("Android Honeycomb Photo Gallery Example");
sp = PreferenceManager.getDefaultSharedPreferences(this);
s_id = sp.getString("logID", null);
Toast.makeText(getApplicationContext(), "ID= " + s_id,
Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "Car_ID= " + carId,
Toast.LENGTH_LONG).show();
//img1 = (ImageView) this.findViewById(R.id.imageView1);
final Vibrator vibrator = (Vibrator)getSystemService(VIBRATOR_SERVICE);
/* img1.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
vibrator.vibrate(100);
AlertDialog.Builder dialogo1 = new AlertDialog.Builder(
MainActivity.this);
dialogo1.setItems(R.array.Save,
new DialogInterface.OnClickListener() {
@SuppressLint("ShowToast")
public void onClick(
DialogInterface dialoginterface,
int i) {
if (i == 0) {
saveImage();
}
}
}).show();
return true;
}
});*/
_gallery = (Gallery) this.findViewById(R.id.gallery1);
startDownload();
_gallery.setAdapter(_imageAdapter);
_gallery.setOnItemClickListener(this);
}
public void send_img() {
Toast.makeText(this, "Send_img", Toast.LENGTH_SHORT).show();
_imageAdapter = new ImageAdapter(this);
_imageAdapter.setimage(bitimg);
}
void saveImage() {
// String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File("/sdcard/CarList/");
Long tsLong = System.currentTimeMillis()/1000;
String ts = tsLong.toString();
String fname = ts+".jpg";
Toast.makeText(getApplicationContext(), "String name=:" + fname, Toast.LENGTH_LONG).show();
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
decodedByte.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onItemClick(AdapterView arg0, View view, int position,
long duration) {
int resourcId = (Integer)
_imageAdapter.getItem(position);
Toast.makeText(getApplicationContext(), "Inside OnItemClick= ",
Toast.LENGTH_LONG).show();
// Drawable drawable =getResources().getDrawable(resourcId);
/* Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
resourcId);
Toast.makeText( this, "Selected Image: " +
getResources().getText(resourcId) + "\nHeight: " + bitmap.getHeight()
+ "\nWidth: " + bitmap.getWidth(), Toast.LENGTH_SHORT).show();*/
}
private void startDownload() {
Toast.makeText(this, "StartDownload", Toast.LENGTH_SHORT).show();
new AppTask().execute(FILENAME);
// return bitimg;
}
public class AppTask extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
str = result;
Toast.makeText(getApplicationContext(), "Array= " + str,
Toast.LENGTH_LONG).show();
try {
JSONArray jArray = new JSONArray(str);
for (int i = 0; i < jArray.length(); i++) {
JSONObject jObject = jArray.getJSONObject(i);
j_img1 = jObject.getString(IMAGE1);
j_img2 = jObject.getString(IMAGE2);
j_img3 = jObject.getString(IMAGE3);
j_img4 = jObject.getString(IMAGE4);
System.out.println("Image Array = " + jArray);
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(IMAGE1, j_img1);
map.put(IMAGE2, j_img2);
map.put(IMAGE3, j_img3);
map.put(IMAGE4, j_img4);
ImageList.add(map);
for (int j = 0; j < ImageList.size(); j++) {
Iterator myVeryOwnIterator = map.keySet().iterator();
while (myVeryOwnIterator.hasNext()) {
String key = (String) myVeryOwnIterator.next();
String value = (String) map.get(key);
byte[] decodedString = Base64.decode(value,
Base64.DEFAULT);
decodedByte = BitmapFactory.decodeByteArray(
decodedString, 0, decodedString.length);
//img1.setImageBitmap(decodedByte);
bitimg.add(decodedByte);
}
}
//img1.setImageBitmap(decodedByte);
}
Toast.makeText(getApplicationContext(),
"bitimg Size= " + bitimg.size(), Toast.LENGTH_LONG)
.show();
send_img();
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(FILENAME);
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
1);
nameValuePairs.add(new BasicNameValuePair("cid", carId));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = EntityUtils.toString(entity);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
}
return is;
}
}
}
这是我的新ImageAdapter.java
And this is my UPDATED ImageAdapter.java
public class ImageAdapter extends BaseAdapter {
private Context _context = null;
String s;
public static ArrayList<Bitmap> imageIds;
String size;
public ImageAdapter(Context context) {
this._context = context;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
Toast.makeText(_context, "getCount= " + imageIds.size(),
Toast.LENGTH_LONG).show();
return (imageIds == null) ? 0 : imageIds.size();
}
@Override
public Object getItem(int index) {
return imageIds.get(index);
}
@Override
public long getItemId(int index) {
return index;
}
@Override
public View getView(int postion, View view, ViewGroup group) {
ImageView imageView = new ImageView(_context);
Toast.makeText(_context, "outside forloop= ", Toast.LENGTH_LONG).show();
for (int i = 0; i<=postion;i++) //< imageIds.size(); postion++)
{
Toast.makeText(_context, "Inside getView= ", Toast.LENGTH_LONG)
.show();
imageView.setImageBitmap(imageIds.get(postion));
imageView.setScaleType(ScaleType.FIT_XY);
imageView.setLayoutParams(new Gallery.LayoutParams(400, 400));
//imageView.setImageResource(imageIds[position]);
// System.gc();
}
return imageView;
}
public void setimage(ArrayList<Bitmap> bitimg) {
imageIds = bitimg;
Toast.makeText(_context, "setimage Size= " + imageIds.size(),
Toast.LENGTH_LONG).show();
}
}
已更新的logcat
UPDATED LOGCAT
07-19 08:42:07.623: E/AndroidRuntime(881): FATAL EXCEPTION: main
07-19 08:42:07.623: E/AndroidRuntime(881): java.lang.NullPointerException
07-19 08:42:07.623: E/AndroidRuntime(881): at com.carlist.ImageAdapter.getCount(ImageAdapter.java:35)
07-19 08:42:07.623: E/AndroidRuntime(881): at android.widget.AbsSpinner.setAdapter(AbsSpinner.java:113)
07-19 08:42:07.623: E/AndroidRuntime(881): at com.carlist.MainActivity.send_img(MainActivity.java:126)
07-19 08:42:07.623: E/AndroidRuntime(881): at com.carlist.MainActivity$AppTask.onPostExecute(MainActivity.java:244)
07-19 08:42:07.623: E/AndroidRuntime(881): at com.carlist.MainActivity$AppTask.onPostExecute(MainActivity.java:1)
07-19 08:42:07.623: E/AndroidRuntime(881): at android.os.AsyncTask.finish(AsyncTask.java:417)
07-19 08:42:07.623: E/AndroidRuntime(881): at android.os.AsyncTask.access$300(AsyncTask.java:127)
07-19 08:42:07.623: E/AndroidRuntime(881): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
07-19 08:42:07.623: E/AndroidRuntime(881): at android.os.Handler.dispatchMessage(Handler.java:99)
07-19 08:42:07.623: E/AndroidRuntime(881): at android.os.Looper.loop(Looper.java:123)
07-19 08:42:07.623: E/AndroidRuntime(881): at android.app.ActivityThread.main(ActivityThread.java:3683)
07-19 08:42:07.623: E/AndroidRuntime(881): at java.lang.reflect.Method.invokeNative(Native Method)
07-19 08:42:07.623: E/AndroidRuntime(881): at java.lang.reflect.Method.invoke(Method.java:507)
07-19 08:42:07.623: E/AndroidRuntime(881): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-19 08:42:07.623: E/AndroidRuntime(881): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-19 08:42:07.623: E/AndroidRuntime(881): at dalvik.system.NativeStart.main(Native Method)
这不是连getview（）方法中去。我需要帮助，请如果有一个人能那么我会感激你。
It is not even going inside the getview() method. I am in need of help please if some one could me then would be thankful to you.
推荐答案
在创建时间 ImageAdater ， imageIds 为null：更改 getCount将，以核对空值
the time you create ImageAdater,imageIds is null: Change getCount in order to check against null values
@Override
public int getCount() {
return (imageIds == null) ? 0 : imageIds.size();
}
@Override
public View getView(int postion, View view, ViewGroup group) {
ImageView imageView = new ImageView(_context);
imageView.setImageBitmap(imageIds.get(postion));
imageView.setScaleType(ScaleType.FIT_XY);
imageView.setLayoutParams(new Gallery.LayoutParams(400, 400));
return imageView;
}
public void send_img() {
Toast.makeText(this, "Send_img", Toast.LENGTH_SHORT).show();
if (_imageAdapter == null) {
_imageAdapter = new ImageAdapter(this);
_gallery.setAdapter(_imageAdapter);
}
_imageAdapter.setimage(bitimg);
_imageAdapter.notifyDataSetChanged();
}
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