进度条，直到从服务器加载数据

Posted 2023-05-07

【中文标题】进度条，直到从服务器加载数据

【英文标题】：Progressbar until the load of data from server

【发布时间】：2016-12-10 15:16:28

【问题描述】：

public class Recyclerview extends AppCompatActivity 

private RecyclerView mRecyclerView;
CustomAdapter cu;


ArrayList<Employee> arr, arr1;
Toolbar toolbar;

TextView t1, t2;
long l = 0;
private ProgressDialog progress;


@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.recyclerview);

    toolbar = (Toolbar) findViewById(R.id.toolbar1);
    setSupportActionBar(toolbar);

    final RecyclerView rv = (RecyclerView) findViewById(R.id.rv);
    rv.setHasFixedSize(true);

    arr = new ArrayList<Employee>();
    arr = InitializeData();

    final LinearLayoutManager llm = new LinearLayoutManager(Recyclerview.this);
    rv.setLayoutManager(llm);
    rv.setHasFixedSize(true);

    cu = new CustomAdapter(Recyclerview.this, arr);

    final bank ban = new bank(Recyclerview.this);
    rv.setAdapter(cu);

    registerForContextMenu(rv);

    ImageButton refresh = (ImageButton) findViewById(R.id.refresh);

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

            Toast.makeText(Recyclerview.this, "ok", Toast.LENGTH_LONG).show();


            if (isNetworkAvailable()) 

                String url = ConstantValues.BASE_URL;
                RequestBody formBody = new FormBody.Builder()
                        .add("key1", "value1")
                        .add("key2", "value2")
                        .add("key3", "value3")
                        .build();

                try 
                    post(url, formBody, new Callback() 
                        @Override
                        public void onFailure(Call call, IOException e) 
                            Log.e("JSONDemo", "IOException", e);
                        

                        @Override
                        public void onResponse(final Call call, final Response response) throws IOException 
                            String JSON = response.body().string();
                            Log.e("res", " " + JSON);
                            try 
                                JSONObject jsonObj = new JSONObject(JSON);

                                JSONArray resultarr = jsonObj.getJSONArray("result");
                                final JSONArray resultarr1 = jsonObj.getJSONArray("result1");


                                ban.OpenDB();
                                /*Delete old Data from Table*/
                                ban.Delete("");
                                for (int i = 0; i < resultarr1.length(); i++) 

                                    Employee emp = new Employee();
                                    JSONObject result1obj = resultarr1.getJSONObject(i);
                                    String result1Id = result1obj.getString(ConstantValues.Bank_ID);
                                    String result1NAME = result1obj.getString(ConstantValues.Bank_NAME);
                                    Log.e("result", " " + result1Id);
                                    Log.e("result", " " + result1NAME);
                                    emp.setId(result1obj.getString(ConstantValues.Bank_ID));
                                    emp.setName(result1obj.getString(ConstantValues.Bank_NAME));
                                    arr.add(emp);

                                    l = ban.InsertQryForTabEmpData(result1Id, result1NAME);
                                
                                ban.CloseDB();


                                runOnUiThread(new Runnable() 
                                    @Override
                                    public void run() 
                                        // you can access all the UI componenet


                                        cu.notifyDataSetChanged();
                                    
                                );
                             catch (Exception e) 
                                Log.e("JSONDemo", "onResponse", e);
                            

                        
                    );

                 catch (Exception e) 
                    Log.e("JSONDemo", "Post Exception", e);
                

             else 
                Toast.makeText(Recyclerview.this, "Internet not available", Toast.LENGTH_LONG).show();
            


        
    );




private ArrayList<Employee> InitializeData() 
    ArrayList<Employee> arr_emp = new ArrayList<Employee>();
    bank ban = new bank(Recyclerview.this);
    long l = 0;
    ban.OpenDB();
    arr_emp = ban.AllSelectQryForTabEmpData();
    ban.CloseDB();
    return arr_emp;
 


private boolean isNetworkAvailable() 
    ConnectivityManager connectivityManager
            = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
    return activeNetworkInfo != null && activeNetworkInfo.isConnected();



private final OkHttpClient client = new OkHttpClient();

Call post(String url, RequestBody formBody, Callback callback) throws IOException 

    Request request = new Request.Builder()
            .url(url)
            .post(formBody)
            .build();

    Call call = client.newCall(request);
    call.enqueue(callback);
    return call;
   
 

通过从服务器获取数据需要一些时间，我想显示 进度条 我找到了 asynctask 的代码，但我没有得到 asynctask 中的内容。所以请帮助我在 android 中摆脱这种情况。提前谢谢你

【参考方案1】：

在onCreate中初始化progress

progress = ProgressDialog.show(this, "dialog title",
"dialog message", true);

在像这样访问服务器之前显示progress

if (isNetworkAvailable()) 
      runOnUiThread(new Runnable() 
              @Override
              public void run() 
                    progress.show();
              
       );
      ...        

从服务器获取结果后关闭

runOnUiThread(new Runnable() 
         @Override
         public void run() 
              if (progress.isShowing())
                  progress.dismiss();
         
);

【讨论】：

老兄，if (isNetworkAvailable()) 已经在 refresh.setOnClickListener(new View.OnClickListener() 块中。

很高兴能为您提供帮助。