Ich entwickle Android Apps,Android - Grid des onResume
einmal Teil dieser Apps ist eine Gridview erstellen, die einige Bilder enthalten (das Bild wird von URL geladen),
dann eine andere Aktivität, die die ausgewählte zeigen Bild im Vollbild wird angezeigt, wenn eines der Bilder in GridView onClick ist.
Problem:
Wenn ich die Gridview-Aktivität geben, es einige Sekunden dauert in der Regel alle Bild in gridview zu laden.
Dann klicke ich eine Bild der gesamte Bildschirm Aktivität eingeben und Taste, um Gridview zu gehen klicken zurück,
aber dauert es einige zu Laden Sekunde, wenn zu gridview gehen zurück, ebenso wie alle Bild Läden wieder .
Ich frage mich, warum die Gridview-Aktivität für ein paar Sekunden geladen wird, wenn onResume?
Zum Beispiel kann in Google Play die Vollbildansicht eines Beispielabbilds in beliebigen Apps sofort zur vorherigen Ansicht zurückkehren.
Geschlossenen Code:
Gridview:
public class ManagePhoto extends Activity {
ImageAdapter ia;
GridView gridview;
InputStream inputStream;
private static final int SELECT_PICTURE = 1;
private String selectedImagePath;
TextView tvRunningMark;
boolean bRunning;
String[] purl;
Bitmap[] bm;
String the_string_response;
TouchImageView touch;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.photo_manage);
//gv is Gobal Value
final Gvalue gv = ((Gvalue) getApplicationContext());
gridview = (GridView) findViewById(R.id.gv_photo);
gridview.setOnItemClickListener(new GridView.OnItemClickListener() {
public void onItemClick(AdapterView adapterView, View view,int position, long id) {
gv.setbm(bm[position]);
Intent myIntent = new Intent(adapterView.getContext(), FullScreenImage.class);
startActivityForResult(myIntent, 0);
}
});
new GridTask().execute();
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return purl.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some
// attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(200,200));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
try {
bm[position] = loadBitmap(purl[position]);
imageView.setImageBitmap(bm[position]);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return imageView;
}
}
class GridTask extends AsyncTask<Void, String, Void> {
@Override
protected void onPostExecute(Void result) {
gridview.setAdapter(ia);
final LinearLayout llo_probar = (LinearLayout)findViewById(R.id.llo_probar);
llo_probar.setVisibility(LinearLayout.GONE);
gridview.setVisibility(GridView.VISIBLE);
}
@Override
protected void onPreExecute() {
}
@Override
protected void onProgressUpdate(String... values) {
}
@Override
protected Void doInBackground(Void... params) {
getphoto();
bm = new Bitmap[purl.length];
ia = new ImageAdapter(ManagePhoto.this);
return null;
}
}
private Bitmap loadBitmap(String url) throws MalformedURLException,IOException {
return BitmapFactory.decodeStream(new FlushedInputStream(
(InputStream) new URL(url).getContent()));
}
class FlushedInputStream extends FilterInputStream {
public FlushedInputStream(final InputStream inputStream) {
super(inputStream);
}
@Override
public long skip(final long n) throws IOException {
long totalBytesSkipped = 0L;
while (totalBytesSkipped < n) {
long bytesSkipped = in.skip(n - totalBytesSkipped);
if (bytesSkipped == 0L) {
int bytesRead = read();
if (bytesRead < 0) { // we reached EOF
break;
}
bytesSkipped = 1;
}
totalBytesSkipped += bytesSkipped;
}
return totalBytesSkipped;
}
}
public void getphoto(){
final Gvalue gv = ((Gvalue) getApplicationContext());
final TextView tv_fn = (TextView) findViewById(R.id.tv_fn);
String result = "";
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("sql",
("select * from personal_photo where member_id = " + gv.getuid())));
InputStream is = null;
// http post
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://" + gv.getserverIP()
+ "/android_getdata.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
}
// convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
// parse json data
try {
List url = new ArrayList();
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
url.add(json_data.getString("save_location"));
}
int size = url.size();
purl = new String[size];
for (int j = 0; j < size; j++) {
purl[j] = (String) url.get(j);
}
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
}
public void toast(String text) {
Toast.makeText(ManagePhoto.this, text, 5).show();
}
}
Vollbild:
public class FullScreenImage extends Activity {
TouchImageView touch;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
new ShowPhotoTask().execute();
}
class ShowPhotoTask extends AsyncTask<Void, String, Void> {
@Override
protected void onPostExecute(Void result) {
setContentView(touch);
}
@Override
protected void onPreExecute() {
setContentView(R.layout.full_image);
}
@Override
protected void onProgressUpdate(String... values) {
}
@Override
protected Void doInBackground(Void... params) {
final Gvalue gv = ((Gvalue) getApplicationContext());
touch = new TouchImageView(FullScreenImage.this);
touch.setMaxZoom(4f); // change the max level of zoom, default is 3f
touch.setImageBitmap(gv.getbm());
return null;
}
}
}
ich nur Änderungen .. startActivity (Absicht); und am Ende() zu OnBackPressed() in FullScreenActivity, aber nicht funktioniert .. Danke für Hilfe –
Was ist das Ergebnis jetzt? – Ishu
gleiche, auch brauchen einige Sekunden für das Laden in onBack –