Question

我是Android的新手，我设法制作以下代码，用于从网站上将信息下载到我的手机应用程序中：

public class Ws_Download_KJ extends AsyncTask<Object, Boolean, String> {
    Adapter_Descarca callerActivity;
    private Activity activity;
    private ProgressDialog dialog;
    private Context context;
    private DataBase_MeniuDreapta sursa_sql;

     public Ws_Download_KJ(Activity activity){
            this.activity = activity;
            this.context = activity;
            this.dialog = new ProgressDialog(activity);
            this.dialog.setTitle("Downloading");
            this.dialog.setMessage("Please wait...");
            this.dialog.setCancelable(true);
            if(!this.dialog.isShowing()){
                this.dialog.show();
            }
        }
    @Override
    protected String doInBackground(Object... params) {
        String serviceUrl = (String) params[0];
        callerActivity = (Adapter_Descarca) params[1];
        List<NameValuePair> nameValuePairs = (List<NameValuePair>) params[2];
        BasicWebService webService = new BasicWebService(serviceUrl);
        webService.nameValuePairs=nameValuePairs;
        return webService.webGet();
    }

    @Override
    protected void onPostExecute(String response) {

        JSONArray jArray;

        sursa_sql = new DataBase_MeniuDreapta(activity);
        sursa_sql.open();
        sursa_sql.sterge_kj();
        try
        {   
            jArray = new JSONArray(response);
            for(int i=0;i<jArray.length();i++)
            { 
                JSONObject json_data = jArray.getJSONObject(i);
                sursa_sql.insert_kj(json_data.getString("salvare"));
            }
            sursa_sql.finalizare_kj();
            sursa_sql.close();
            dialog.dismiss();
        }
        catch(Exception e)
        {
            Log.d("Error: ", " "+e.getMessage());
        }
        super.onPostExecute(response);
    }

}

我的应用程序正在连接到一个网站，抛出这个课程，并回忆起json的共鸣。 json响应包含sql insert的语句，如：

insert into table values (....),(....),(....) ....
insert into table values (....),(....),(....) ....

我的问题，希望你能帮助我：如何将我的对话框从我所拥有的转换为进度条。要添加或修改的内容。

谢谢，

Answer 1

要向用户显示进度，您可以使用ProgressDialogs方法以下是我的某个应用中的一些示例代码：

ProgressDialog mProgressDialog = new ProgressDialog(mContext);
mProgressDialog.setMessage("Downloading...");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.show();

mProgressDialog.setIndeterminate(false);
//set the max value for the dialog
mProgressDialog.setMax(fileTableCursor.getCount());
for(int i = 0; i < fileTableCursor.getCount(); i++) {
    //set the progress
    mProgressDialog.setProgress(i+1);
}
//dismiss ProgressDialog after work is done
mProgressDialog.dismiss();

我在Activity中使用ProgressDialog。您可以使用AsyncTasks onProgressUpdate设置进度，因为您无法从doinBackground主题访问用户界面。

希望这会有所帮助：）

用于json响应的android进度条

1 个答案: