0
我在Listview中通過運行背面任務逐個加載圖像。我正在運行進度條，直到它完全加載。當圖像開始加載時，進度不會改變。我想要在圖像加載時更改進度條的位置。如何做？我究竟做錯了什麼？如何在List視圖中加載圖像時移動進度條的位置
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relaGrid"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<include
android:id="@+id/Master"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
layout="@layout/activity_master_page" />
<ListView
android:id="@+id/ItemView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/Master" >
</ListView>
<ProgressBar
android:id="@+id/ItemsProgressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/Master"
android:layout_centerHorizontal="true" />
</RelativeLayout>
添加用於加載圖像的代碼
私有類testAynscTask延伸的AsyncTask {
@Override
protected void onPreExecute() {
TheProgressBarG = (ProgressBar) findViewById(R.id.ItemsProgressBar);
TheProgressBarG.setVisibility(View.VISIBLE);
}
protected Void doInBackground(Void... ParamsP) {
try {
POSManager aPOSManagerL = new POSManager();
ListCriteria aListCriteriaL = new ListCriteria();
ObjectInformation zItemInfoL = new ObjectInformation();
CategoryItemListG = new ObjectList();
//Get CategoryId
String zCategoryIdL = GetCategoryId();
aListCriteriaL.SearchConditionsM.AddSearchConditionWithValue("Item_Category.Id", zCategoryIdL);
Gson gsonBuilderL = new GsonBuilder().serializeNulls().create();
String zListCriteriaL = gsonBuilderL.toJson(aListCriteriaL);
//Get Category Items List
aPOSManagerL.GetCategoryItems(HttpUtil.SessionKeyM,zListCriteriaL);
DisplayMetrics zDisplayMetricsL = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(zDisplayMetricsL);
int nPreviewSizeL = zDisplayMetricsL.widthPixels/3;
ObjectList zItemListL = HttpUtil.CategoryItemListM;
for (int countL = 0; countL < zItemListL.GetLength(); countL++) {
zItemInfoL = (ObjectInformation) zItemListL.GetObject(countL);
String zItemIdL = (String) zItemInfoL.GetValue("ID");
//Get Item Image
aPOSManagerL.GetCategoryItemImage(HttpUtil.SessionKeyM,zItemIdL, nPreviewSizeL);
zItemInfoL.SetValue("aPictureByteArrayP",HttpUtil.CategoryItemImageBytesM);
CategoryItemListG.Add(zItemInfoL);
publishProgress(countL);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onProgressUpdate(Integer... PositionP) {
ListView TheItemListViewL=(ListView) findViewById(R.id.ItemView);
TheItemListViewL.setAdapter(anImageAdapterG);
super.onProgressUpdate(PositionP);
}
@Override
protected void onPostExecute(Void ResultP) {
super.onPostExecute(ResultP);
TheProgressBarG.setVisibility(View.INVISIBLE);
anImageAdapterG.notifyDataSetChanged();
}
}
公共類ImageAdapter延伸BaseAdapter { 私有上下文mContextL;
public ImageAdapter(Context contextP) {
mContextL = contextP;
}
public int getCount() {
return CategoryItemListG.GetLength();
// return mImageIds.length;
}
public Object getItem(int PositionP) {
return PositionP;
}
public long getItemId(int PositionP) {
return PositionP;
}
public View getView(int PositionP, View ConvertViewP, ViewGroup ParentP) {
ObjectInformation zItemInfoL = (ObjectInformation)CategoryItemListG.GetObject(PositionP);
String zItemNameL = (String)zItemInfoL.GetValue("ITEMNAME");
String zItemPriceL = (String)zItemInfoL.GetValue("SalesPrice");
String zItemImageBytesL = (String)zItemInfoL.GetValue("aPictureByteArrayP");
Bitmap ItemImageBitMapL =GetItemImageBitMap(zItemImageBytesL);
RelativeLayout TheRelativelayoutL = new RelativeLayout(getApplicationContext());
ImageView TheItemImageL = new ImageView(mContextL);
TheItemImageL.setImageBitmap(ItemImageBitMapL);
TheItemImageL.setScaleType(ImageView.ScaleType.FIT_XY);
TheItemImageL.setLayoutParams(new ListView.LayoutParams(100,100));
TheItemImageL.setPadding(1, 0, 0, 0);
TheItemImageL.setId(1);
TextView tvItemNameL = new TextView(mContextL);
tvItemNameL.setText(zItemNameL);
tvItemNameL.setGravity(Gravity.CENTER);
tvItemNameL.setTextSize(10);
tvItemNameL.setTextColor(Color.parseColor("#000000"));
tvItemNameL.setPadding(15, 0, 0, 0);
tvItemNameL.setId(2);
TextView tvItemPriceL = new TextView(mContextL);
tvItemPriceL.setText("Rs. "+zItemPriceL);
tvItemPriceL.setGravity(Gravity.CENTER);
tvItemPriceL.setTextSize(10);
tvItemPriceL.setTextColor(Color.parseColor("#A30000"));
tvItemPriceL.setId(3);
tvItemPriceL.setPadding(15, 0, 0, 20);
TheRelativelayoutL.addView(TheItemImageL);
RelativeLayout.LayoutParams zRelativeLayoutParamsL = new RelativeLayout.LayoutParams((RelativeLayout.LayoutParams.WRAP_CONTENT),(RelativeLayout.LayoutParams.WRAP_CONTENT));
zRelativeLayoutParamsL.addRule(RelativeLayout.RIGHT_OF,1);
zRelativeLayoutParamsL.addRule(RelativeLayout.CENTER_IN_PARENT);
TheRelativelayoutL.addView(tvItemNameL, zRelativeLayoutParamsL);
zRelativeLayoutParamsL = new RelativeLayout.LayoutParams((RelativeLayout.LayoutParams.WRAP_CONTENT),(RelativeLayout.LayoutParams.WRAP_CONTENT));
zRelativeLayoutParamsL.addRule(RelativeLayout.RIGHT_OF,1);
zRelativeLayoutParamsL.addRule(RelativeLayout.BELOW,2);
zRelativeLayoutParamsL.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
TheRelativelayoutL.addView(tvItemPriceL, zRelativeLayoutParamsL);
return TheRelativelayoutL;
}
這只是事物的佈局，這裏是背後的邏輯.. – nsthethunderbolt 2013-02-22 06:14:04
請添加在你的問題你的代碼。 – NaviRamyle 2013-02-22 06:37:53