错误 AsyncTask 进度条不显示

Question

你好朋友我一直在杀头来实现呃终止这段代码尝试了一切但没有任何结果..

我觉得这部分有误

ImageAdapter ImageAdapter  = new ImageAdapter();
lstView1.setAdapter (ImageAdapter);

应该很好但是没能达到诶！

lstView1.setAdapter (new ImageAdapter (this, MyArrList));

我感谢所有帮助我正在尝试一个应用程序，在这个应用程序中寻找一个名字，在另一个 activity 中传递参数并在 mysql 数据库中显示列表视图 alamacenados 文本和图像。使用 json

 public class MainActivity extends Activity {

    private ProgressDialog pDialog;

     public String searchkey;



      // Creating JSON Parser object
        JSONParser jParser = new JSONParser();


    @SuppressLint("NewApi")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#1b1b1b")));



        Intent myIntent = getIntent(); 


        searchkey = myIntent.getStringExtra("texto");

      final  String url = "http://10.0.2.2/test/getJSON.php?keyword=" +  searchkey ;       

        // Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 11) {
            StrictMode.ThreadPolicy policy = new                        StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);


}





        // listView1
        final ListView lstView1 = (ListView)findViewById(R.id.listView1); 






        class pbar extends AsyncTask<String, String, String> {


            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();
            }










            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                pDialog = new ProgressDialog(MainActivity.this);
                pDialog.setMessage("Cargando Productos.Por Favor Espere.");
                pDialog.setIndeterminate(false);
                pDialog.setCancelable(false);
                pDialog.show();
            }

            /**
             * getting Idioms from url
             * */
            protected String doInBackground(String... args) {









                try {


                    JSONArray data = new JSONArray(getJSONUrl(url));

                    final ArrayList<HashMap<String, String>> MyArrList = new ArrayList<HashMap<String, String>>();
                    HashMap<String, String> map;

                    for(int i = 0; i < data.length(); i++){
                        JSONObject c = data.getJSONObject(i);
                        map = new HashMap<String, String>();
                        map.put("ImageID", c.getString("ImageID")); 
                        map.put("ImageDesc", c.getString("ImageDesc"));
                        map.put("ImagePath", c.getString("ImagePath"));
                        MyArrList.add(map);

                    //  hidePDialog();



                    }


                    ImageAdapter ImageAdapter = new ImageAdapter();
                    lstView1.setAdapter(ImageAdapter);





                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                //  hidePDialog();
                    e.printStackTrace();
                }



                   new pbar().execute();
                return null;

            }
            protected void onPostExecute(String file_url) {
                // dismiss the dialog after getting the related idioms
                pDialog.dismiss();
            }

        }


    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

ImageAdapter.java

 public class ImageAdapter extends BaseAdapter {


    private Context context;
    private ArrayList<HashMap<String, String>> MyArr = new ArrayList<HashMap<String, String>>();

 // constructor
    public ImageAdapter() {

    }


    public ImageAdapter(Context c, ArrayList<HashMap<String, String>> list)  {
        // TODO Auto-generated method stub
        context = c;
        MyArr = list;
    }

    public int getCount() {
        // TODO Auto-generated method stub
        return MyArr.size();
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);


        if (convertView == null) {
            convertView = inflater.inflate(R.layout.activity_column, null); 
        }

        // ColImage
        ImageView imageView = (ImageView) convertView.findViewById(R.id.ColImgPath);
        imageView.getLayoutParams().height = 100;
        imageView.getLayoutParams().width = 100;
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
         try
         {
             imageView.setImageBitmap(loadBitmap(MyArr.get(position).get("ImagePath")));
         } catch (Exception e) {
             // When Error
             imageView.setImageResource(android.R.drawable.ic_menu_report_image);
         }

        // ColPosition
        TextView txtPosition = (TextView) convertView.findViewById(R.id.ColImgID);
        txtPosition.setPadding(10, 0, 0, 0);
        txtPosition.setText("ID : " + MyArr.get(position).get("ImageID"));

        // ColPicname
        TextView txtPicName = (TextView) convertView.findViewById(R.id.ColImgDesc);
        txtPicName.setPadding(50, 0, 0, 0);
        txtPicName.setText("Desc : " + MyArr.get(position).get("ImageDesc"));

        //hidePDialog();

        return convertView;

    }



    private static final String TAG = "ERROR";
    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);
     }

 }
}

Answer 1

我无法对其进行测试，所以我会指出一个错误，您肯定会遇到这个错误：换行：

ImageAdapter ImageAdapter = new ImageAdapter();
lstView1.setAdapter(ImageAdapter);

例如那些：

ImageAdapter imageAdapter = new ImageAdapter();
lstView1.setAdapter(imageAdapter);

编辑：

那就试试这个：

ImageAdapter imageAdapter = new ImageAdapter(MainActivity.this, MyArrList);
lstView1.setAdapter(imageAdapter);

错误 AsyncTask 进度条不显示

Error AsyncTask Progress Bar not display

java

mysql

android

android-asynctask