Android ProgressBar instantly display download progress detailed explanation

<RelativeLayout xmlns:andro
  xmlns:tools="/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context="$PlaceholderFragment" >

  <!-- prigressBar Progress bar -->
  <!-- progress Current progress -->
  <!-- indeterminate Not clear  defaultfalse -->
  <ProgressBar
    android:
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:max="100"
    android:progress="0"
    android:indeterminate="true"/>

  <Button
    android:
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:onClick="startLoad"
    android:layout_marginTop="86dp"
    android:background="#009FEE"
    android:text="@string/start"
    android:textColor="#ffffff" />

  <TextView
    android:
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/progressBar1"
    android:background="@null"
    android:layout_alignParentLeft="true" />
  
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>

  <string name="app_name">hwdownload</string>
  <string name="hello_world">Hello world!</string>
  <string name="action_settings">Settings</string>
  <string name="start">start</string>
  <string name="stop">pause</string>
  <string name="contin">continue</string>

</resources>

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/**
  * Only by creating a View thread can you change the UI of this View!!! The main thread is also called UI thread
  */
public class MainActivity extends Activity {
  private ProgressBar progressBar1;
  private Button button1;
  private TextView textView1;

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

    progressBar1 = (ProgressBar) findViewById(.progressBar1);
    button1 = (Button) findViewById(.button1);
    textView1 = (TextView) findViewById(.textView1);

  }

  public void startLoad(View view) {
     String text = (String) ();
    // Set button content ----It's useless...    ((getResources().getString()) ? 
        : ((getResources().getString()) ? 
            : ));
    (false);

    new Thread(new Runnable() {
      private int percent;

      @Override
      public void run() {
        try {
          // Open URL must be in the child thread          URL url = new URL(
              "/sjbizhi/images/9/540x960/");
          HttpURLConnection conn = (HttpURLConnection) ();
          // ("GET");
          // (5000);
          // (5000);

          int contentLength = ();

          if (() == HttpURLConnection.HTTP_OK) {
            InputStream is = ();

            byte[] buffer = new byte[1024];
            int len = -1;
            int sum = 0;
            while ((len = (buffer)) != -1) {
              sum += len;
              // Pay attention to the strong rotation method to prevent it from being 0 all the time              percent = (int) (100.0 * sum / contentLength);
              // Child thread running on the main thread              runOnUiThread(new Runnable() {

                @Override
                public void run() {
                  (percent);
                  (percent + "%");
                  if (percent == ()) {
                    (,
                        "Download is complete!", Toast.LENGTH_SHORT)
                        .show();
                  }
                }
              });
            }
            ();
            ();
          }
        } catch (IOException e) {
          ();
        }
      }
    }).start();
  }
}