进度栏/对话框，同时将数据发送到json

问题描述

我是android的新手，我想在将数据发送到API时显示进度条，而当应用程序完成数据发送后，进度条将关闭。

我不确定如何使用已有的代码来实现进度。 请一些帮助？

这是我用来将数据发送到我的API的代码：

    sendDataBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

                    RequestModel data = helper.sendData(Integer.parseInt(imt));
                    request = new ApiRequest(MainActivity.this, APIMethod.POST, data);

                    try {
                        String response = request.execute("myURL").get();

                        ResponseModel responseModel = new ResponseModel(response);

                        if (responseModel.isSuccess()) {
                            Toast.makeText(getApplication(), "OK", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(getApplication(), "ERROR", Toast.LENGTH_SHORT).show();
                        }
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    } catch (ExecutionException e) {
                        e.printStackTrace();
                    }
                }
            } 
        }
    });

您可以使用AsyncTask来做到这一点。 在OnClickListener中处理代码时，正在使用主线程，因此UI将在执行期间被阻塞，因此使用AsyncTask时，您的代码将在另一个后台线程上执行。

您可以创建一个侦听器：

public interface AsyncTaskListener {
     void onStart();
     void onSuccess();
     void onError(Exception ex);
}

您的AsyncTask类：

public class CustomAsyncTask extends AsyncTask<Integer, Void, CustomAsyncTask.ProcessingResult> {
    private AsyncTaskListener mListener;

    public CustomAsyncTask (AsyncTaskListener aListener) {
        mListener = aListener;
    }

    @Override
    protected void onPreExecute(){
         mListener.onStart();
    }

    @Override
    protected CustomAsyncTask.ProcessingResult doInBackground(Integer... params) {
        RequestModel data = helper.sendData(params[0]);
        request = new ApiRequest(MainActivity.this, APIMethod.POST, data);

        try {
            String response = request.execute("myURL").get();
            ResponseModel responseModel = new ResponseModel(response);

            if (responseModel.isSuccess()) {
                return new ProcessingResult();
            } else {
                return new ProcessingResult(new Exception("Error message"));
            }
        } catch (InterruptedException|ExecutionException  e) {
            return new ProcessingResult(e);
        }
    }

    @Override
    protected void onPostExecute(ProcessingResult aResult) {
        Exception error = aResult.getError();
        if(error == null){
            mListener.onError(error);
        } else {
            mListener.onSuccess();
        }
    }

    private class ProcessingResult {
        private Exception mError;

        ProcessingResult () {

        }

        ProcessingResult (Exception aError) {
            mError = aError;
        }

        Exception getError() {
            return mError;
        }
    }
}

添加到布局XML：

<ProgressBar
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true" />

您的活动课程：

public class MainActivity extends AppCompatActivity {
    private ProgressBar mProgressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main_activity);
        mProgressBar = findViewById(R.id.progressBar);

        Button yourButton = findViewById(R.id.your_button_id);
        yourButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                CustomAsyncTask asyncTask = new CustomAsyncTask(new CustomListener());
                asyncTask.execute(Integer.parseInt(your_integer));
            }
        });
    }

    private class CustomListener implements AsyncTaskListener {
        public void onStart() {
            mProgressBar.setVisibility(View.VISIBLE);
        }

        public void onSuccess() {
            Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
            mProgressBar.setVisibility(View.GONE);
        }

        public void onError(Exception ex) {
            Toast.makeText(MainActivity.this, ex.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
            mProgressBar.setVisibility(View.GONE);
        }
    }
}