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我試圖從xml中獲取圖像和文本...但是我想要這種進度發生在後臺，所以我試圖使用一個線程，我可以將數據導入一些數組，然後我可以設置我的imageView和這個數組的textView。當我運行時，我看到在線程中程序工作正常獲取數據並放入數組...但在setText和setImageBitmap，我看到這些數組爲空？！怎麼會發生？從線程中獲取數據從XML？
我basicly下面這個教程用來從XML獲取數據：http://p-xr.com/android-tutorial-how-to-parseread-xml-data-into-android-listview/
這是我的代碼：
public class mainPage {
HashMap<Integer, String> desc;
HashMap<Integer, Bitmap> bitMap;
ScrollView scroll;
View app, temp;
static int j = 0;
static View first;
static NodeList nodes;
static TextView textView, textView1, textView2;
static ImageView img, image1, image2;
LinearLayout parent;
HashMap<Integer, View> others;
Runnable get;
public mainPage() {
this.app = MainActivity.app;
this.scroll = (ScrollView) app.findViewById(R.id.mainPage_scroll);
this.parent = new LinearLayout(scroll.getContext());
parent.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT));
parent.setOrientation(LinearLayout.VERTICAL);
scroll.addView(parent);
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
others = new HashMap<Integer, View>();
// add first item to main page
first = inflater.inflate(R.layout.main_page_first_item, null);
parent.addView(first);
others.put(0, first);
for (int i = 2; i < 10; i++) {
temp = inflater.inflate(R.layout.main_page_item, null);
others.put(i, temp);
parent.addView(temp);
}
}
public void setPage() {
// take datas from XML
String xml = XMLfunctions.getXML();
Document doc = XMLfunctions.XMLfromString(xml);
// which datas need to be taken, by tag
nodes = doc.getElementsByTagName("image");
desc = new HashMap<Integer, String>();
bitMap = new HashMap<Integer, Bitmap>();
new Thread(new Runnable() {
public void run() {
for (j = 0; j < 20; j++) {
if (j != 1) {
Element e = (Element) nodes.item(j);
desc.put(j, XMLfunctions.getValue(e, "description"));
Log.d("try", desc.get(j));
Log.d("tryy",
XMLfunctions.getValue(e, "description"));
bitMap.put(j, XMLfunctions.getContactPhoto(XMLfunctions
.getValue(e, "path")));
}
}
}
}).start();
// add the first item to main page
textView = (TextView) (others.get(0)).findViewById(R.id.text);
img = (ImageView) (others.get(0)).findViewById(R.id.image);
Log.d("first", desc.get(0) + desc.get(0));
if (textView != null)
textView.setText(desc.get(0));
if (img != null)
img.setImageBitmap(bitMap.get(0));
// add the rest of items to main page
for (j = 2; j < 10; j++) {
if (j % 2 == 0) {
textView1 = (TextView) (others.get(j)).findViewById(R.id.text1);
image1 = (ImageView) (others.get(j)).findViewById(R.id.image1);
Log.d("others", j + ": " + desc.get(j) + desc.get(j));
if (textView1 != null)
textView1.setText(desc.get(j));
if (image1 != null)
image1.setImageBitmap(bitMap.get(j));
} else {
textView2 = (TextView) (others.get(j - 1))
.findViewById(R.id.text2);
image2 = (ImageView) (others.get(j - 1))
.findViewById(R.id.image2);
Log.d("others", j + ": " + desc.get(j) + desc.get(j));
if (textView2 != null)
textView2.setText(desc.get(j));
if (image2 != null)
image2.setImageBitmap(bitMap.get(j));
}
}
}
}
終於在mainActivity我使用這些代碼爲達到這一類我」米不知道這是否有必要，但我也給予。
mainPage fillMain = new mainPage();
fillMain.setPage();
我也試過，但後來我無法做到這一點，所以我只是嘗試這種方式，但以一種奇怪的方式，它不會變成數組的值...變成空的 – yahya 2012-02-28 06:04:41
@yahya你可以發表一個例子嗎？後臺進程可能會拋出一個錯誤？ – 2012-02-28 15:24:09
@BrianMains請檢查我的答案，我張貼我的AsyncTask嘗試... – yahya 2012-02-28 17:31:23