Question

@Override
public void onClick(View v) {
    switch(v.getId()){
    case R.id.btn_sync:
for ( int i = 0; i<10; i++)   {
    current_status = i;
    new SyncTask().execute(String1,String2,String3);
    new Thread(new Runnable() {
        public void run() {
            while (current_status < 100) {
                current_status += 1;
                //sync_progress.setProgress(current_status);
                //sync_decrip.setText(current_status+" data is uploading from total of "+c_id.size());
                handler.post(new Runnable() {
                    public void run() {
                        sync_progress.setProgress(current_status);
                        sync_decrip.setText(current_status + " data is uploading from total of " + c_id.size());
                    }
                });
                try {
                    // Sleep for 200 milliseconds. 
                    //Just to display the progress slowly
                    Thread.sleep(200);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }).start();
}
}
}

public class SyncTask extends AsyncTask<String, Void, String> {     
    ProgressDialog progressDialog;
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... arg0) {
        String result=null;
            try{
                // url where the data will be posted                    
                String postReceiverUrl = "http://MyUrl";
                Log.v(TAG, "postURL: " + postReceiverUrl);                   
                HttpClient httpClient = new DefaultHttpClient();   // HttpClient                    
                HttpPost httpPost = new HttpPost(postReceiverUrl);  // post header

                // add your data
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(3);
                //Log.d(uname.getText().toString(), pass.getText().toString());
                nameValuePairs.add(new BasicNameValuePair("customer_id", arg0[0]));
                nameValuePairs.add(new BasicNameValuePair("name", arg0[1]));
                nameValuePairs.add(new BasicNameValuePair("mobile1", arg0[2]));

                // execute HTTP post request
                HttpResponse response = httpClient.execute(httpPost);
                result = EntityUtils.toString(response.getEntity());
        } 
            catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    @Override
    protected void onPostExecute(String result) {
        // do stuff after posting data
        //progressDialog.dismiss();
        String message=null;  
        try {
            Log.d("Inside Post", "message");
            root = new JSONObject(result);
            validation = root.getInt("response");
            message = root.getString("CustomerName");
            message+=root.getString("MobileNumber");
            up_state=root.getString("MobileNumber");
            Log.d(result, user_id);
            //Toast.makeText(getApplicationContext(), user_id, Toast.LENGTH_LONG).show();
            if(validation==1) {
                Log.e(message, root.getString("Emailid"));
                //Toast.makeText(getApplicationContext(),"Success: "+ message, Toast.LENGTH_LONG).show();
            }
//              else
//                  Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
            }
        catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
    }
}

我正在尝试使用进度条将数据从sqlite同步到DB。当我调试此进度条时，在上传所有数据后显示。在文本框中，current_status总是＆＃34; 100个数据从10＆＃34;的总数上传。但数据仅为10.如何在上传一个数据时更改文本框值。我在handler.post之前尝试了这两个与文本框相关的行（new Runnable（）{。但是应用程序崩溃了下面的日志。

12-25 12:19:45.909: E/AndroidRuntime(21914): FATAL EXCEPTION: Thread-981
12-25 12:19:45.909: E/AndroidRuntime(21914):         android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4077)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:734)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.view.View.requestLayout(View.java:12679)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.view.View.requestLayout(View.java:12679)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.view.View.requestLayout(View.java:12679)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.view.View.requestLayout(View.java:12679)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.view.View.requestLayout(View.java:12679)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.view.View.requestLayout(View.java:12679)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.widget.TextView.checkForRelayout(TextView.java:6773)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.widget.TextView.setText(TextView.java:3306)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.widget.TextView.setText(TextView.java:3162)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at android.widget.TextView.setText(TextView.java:3137)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at ridio.helixtech.SyncClass$1.run(SyncClass.java:121)
12-25 12:19:45.909: E/AndroidRuntime(21914):    at java.lang.Thread.run(Thread.java:856)

Answer 1

我建议在UI线程（runOnUiThread（））上运行它来更新文本字段和UI组件。

其次，你遇到了重大的逻辑问题。从您的初始代码，我假设您想要在跟踪状态时执行10个SyncTask。

从我可以看到的逻辑问题来看，这是我推荐的引导式重构工作流程（我不会直接为您的学习曲线提供解决方案）：

应该从onClick方法中的for循环中取出以下跟踪。

@Override
public void onClick(View v) {
    switch(v.getId()){
    case R.id.btn_sync:
      for ( int i = 0; i<10; i++)   {
        current_status = i;
        new SyncTask().execute(String1,String2,String3);
      }

      // NOTE: The following should be refactored: 
      // It is better to create another AsyncTask for this tracking and updating the progress
      new Thread(new Runnable() {
        public void run() {
            while (current_status < 100) {
                current_status += 1;
                //sync_progress.setProgress(current_status);
                //sync_decrip.setText(current_status+" data is uploading from total of "+c_id.size());
                handler.post(new Runnable() {
                    public void run() {
                        sync_progress.setProgress(current_status);
                        sync_decrip.setText(current_status + " data is uploading from total of " + c_id.size());
                    }
                });
                try {
                    // Sleep for 200 milliseconds. 
                    //Just to display the progress slowly
                    Thread.sleep(200);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }).start();
  }
}

为String1（customer_id），String2（name）和String3（mobile1）创建一个包装类（例如：CustomerSyncDetails.class）。

然后将所有10个客户详细信息放入一个数组（例如：arrayofCustomerSyncDetails），将包装器对象的数组传递给SyncTask。

在SyncTask doInBackground（）方法中执行for循环。

new SyncTask().execute(arrayofCustomerSyncDetails);

对于跟踪线程，存在一个主要的逻辑缺陷，这是它显示上传的100个数据的主要原因。

while (current_status < 100) {
  current_status += 1;
  //sync_progress.setProgress(current_status);
  ...

我建议通过在AsyncTask和跟踪线程之间建立共享变量来重新考虑解决方案。

完成所有工作后进度条运行

1 个答案: