我是Android开发和Java的新手。
我收到以下错误：
Could not load Bitmap from: /images/image.php.......
此代码块中出现错误：
public class JSONImageViewer extends Activity {
private GridView gridV;
private ImageAdapter imageAdapter;
public int currentPage = 1;
public int TotalPage = 0;
public Button btnNext;
public Button btnPre;
private final static String TAG_IMG = "CarImageLink";
ArrayList<HashMap<String, Object>> MyArrList = new ArrayList<HashMap<String, Object>>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// ProgressBar
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.activitymain);
// GridView and imageAdapter
gridV = (GridView) findViewById(R.id.gridView1);
gridV.setClipToPadding(false);
imageAdapter = new ImageAdapter(getApplicationContext());
gridV.setAdapter(imageAdapter);
// Next
btnNext = (Button) findViewById(R.id.btnNext);
btnNext.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
currentPage = currentPage + 1;
ShowData();
}
});
// Previous
btnPre = (Button) findViewById(R.id.btnPre);
btnPre.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
currentPage = currentPage - 1;
ShowData();
}
});
// Show first load
ShowData();
}
public void ShowData()
{
btnNext.setEnabled(false);
btnPre.setEnabled(false);
setProgressBarIndeterminateVisibility(true);
new LoadContentFromServer().execute();
}
class LoadContentFromServer extends AsyncTask<Object, Integer, Object> {
@Override
protected Object doInBackground(Object... params) {
String url = "http://.....";
//JSONArray data;
JSONObject data;
try {
//data = new JSONArray(getJSONUrl(url));
data = new JSONObject(getJSONUrl(url));
JSONArray dataArray = data.getJSONArray("car_images");
MyArrList = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> map;
/*
* TotalRows = Show for total rows
* TotalPage = Show for total page
*/
int displayPerPage = 9; // Per Page
int TotalRows = data.length();
int indexRowStart = ((displayPerPage * currentPage) - displayPerPage);
if (TotalRows <= displayPerPage) {
TotalPage = 1;
} else if ((TotalRows % displayPerPage) == 0) {
TotalPage = (TotalRows / displayPerPage);
} else {
TotalPage = (TotalRows / displayPerPage) + 1;
TotalPage = (int) TotalPage;
}
int indexRowEnd = displayPerPage * currentPage;
if (indexRowEnd > TotalRows) {
indexRowEnd = TotalRows;
}
for (int i = 0; i < dataArray.length(); i++) {
map = new HashMap<String, Object>();
JSONObject c = dataArray.getJSONObject(i);
// Thumbnail Get ImageBitmap To Object
Bitmap newBitmap = loadBitmap(c.getString(TAG_IMG));
map.put("CarImageLink", newBitmap);
MyArrList.add(map);
Log.v("MyArrList", MyArrList.toString());
publishProgress(i);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
public void onProgressUpdate(Integer... progress) {
imageAdapter.notifyDataSetChanged();
}
@Override
protected void onPostExecute(Object result) {
// Disabled Button Next
if(currentPage >= TotalPage) {
btnNext.setEnabled(false);
}
else {
btnNext.setEnabled(true);
}
// Disabled Button Previous
if(currentPage <= 1) {
btnPre.setEnabled(false);
}
else {
btnPre.setEnabled(true);
}
setProgressBarIndeterminateVisibility(false); // When Finish
}
}
class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context context) {
mContext = context;
}
public int getCount() {
return MyArrList.size();
}
public Object getItem(int position) {
return MyArrList.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = inflater.inflate(R.layout.activity_column, null);
}
// ColPhoto
ImageView imageView = (ImageView) convertView.findViewById(R.id.ColPhoto);
imageView.getLayoutParams().height = 60;
imageView.getLayoutParams().width = 60;
imageView.setPadding(5, 5, 5, 5);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
try
{
imageView.setImageBitmap((Bitmap)MyArrList.get(position).get("CarImageLink"));
Log.v("MyArrList2", MyArrList.toString());
} catch (Exception e) {
// When Error
imageView.setImageResource(android.R.drawable.ic_menu_report_image);
}
return convertView;
}
}
/*** Get JSON Code from URL ***/
public String getJSONUrl(String url) {
StringBuilder str = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
// Download OK
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
str.append(line);
}
} else {
Log.e("Log", "Failed to download file..");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return str.toString();
}
/***** Get Image Resource from URL *****/
private static final String TAG = "CarImageLink";
private static final int IO_BUFFER_SIZE = 4 * 1024;
public static Bitmap loadBitmap(String url) {
Bitmap bitmap = null;
InputStream in = null;
BufferedOutputStream out = null;
try {
in = new BufferedInputStream(new URL(url).openStream(), IO_BUFFER_SIZE);
final ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
out = new BufferedOutputStream(dataStream, IO_BUFFER_SIZE);
copy(in, out);
out.flush();
final byte[] data = dataStream.toByteArray();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 1;
bitmap = BitmapFactory.decodeByteArray(data, 0, data.length,options);
} catch (IOException e) {
Log.e(TAG, "Could not load Bitmap from: " + url);
} finally {
closeStream(in);
closeStream(out);
}
return bitmap;
}
private static void closeStream(Closeable stream) {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
android.util.Log.e(TAG, "Could not close stream", e);
}
}
}
private static void copy(InputStream in, OutputStream out) throws IOException {
byte[] b = new byte[IO_BUFFER_SIZE];
int read;
while ((read = in.read(b)) != -1) {
out.write(b, 0, read);
}
}
为了数据完整性，我将限制显示的JSON解析数据和网址的数量。
我已经研究过这些错误并尝试应用解决方案但没有成功。
任何建议都表示赞赏。谢谢。
答案 0 :(得分：0)
您收到的回复不是JSONArray，而是JSONObject。试试这个：new JSONObject(getJSONUrl(url));
答案 1 :(得分：0)
{＆＃34; car_images＆＃34;：[{＆＃34; Car ....}是JSONObject而不是JSONArray
您应该将数据更改为JSONObject
JSONObject data = new JSONObject(getJSONUrl(url));
然后你得到了数组：
JSONArray dataArray = data.getJSONArray("car_images");