title: Android how to make the ProgressBar(circle) to cover the full screen when pressing button?
body: <p>I try to display a ProgessBar when clicking Submit Button. It will hide when the data finished loading. However, the progressBar didn't cover the full screen. Instead, it's cover by the Button. Please refer to the screenshot, its should be easier to understand what do i mean. </p>
  
  <p><a href="https://i.stack.imgur.com/hLqfU.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hLqfU.jpg" alt="enter image description here"></a></p>
  
  <p>What I want to achieve is the bottom part of the screenshot. </p>
  
  <p><strong>Main4Activity.java</strong></p>
  
  <pre><code>public class Main4Activity extends AppCompatActivity {
  
  ProgressBar progressBar;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main4);
  
      progressBar = (ProgressBar) findViewById(R.id.progressBar);
      progressBar.setVisibility(View.GONE);
  
      final EditText username=(EditText)findViewById(R.id.username);
      final EditText email=(EditText)findViewById(R.id.email);
      final EditText password=(EditText)findViewById(R.id.password);
  
      final Button submit=(Button)findViewById(R.id.submit);
      submit.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
  
              progressBar.setVisibility(View.VISIBLE);
  
              final String get_username=username.getText().toString();
              final String get_email=email.getText().toString();
              final String get_password=password.getText().toString();
  
              Response.Listener&lt;String&gt; response_listener=new Response.Listener&lt;String&gt;() {
                  @Override
                  public void onResponse(String response) {
                      try{
                          JSONObject jsonObject=new JSONObject(response);
                          boolean result=jsonObject.getBoolean("register_result");
                          progressBar.setVisibility(View.GONE);
                          if(result){
  
                              AlertDialog.Builder builder=new AlertDialog.Builder(Main4Activity.this);
  
                              builder.setMessage("Registration Done!")
                                      .setNegativeButton("Back",null)
                                      .create()
                                      .show();
  
                          }else{
  
                              AlertDialog.Builder builder=new AlertDialog.Builder(Main4Activity.this);
                              builder.setMessage("User already existed! Please try different Email")
                                      .setNegativeButton("Back",null)
                                      .create()
                                      .show();
                          }
  
                      }catch(JSONException e){
                          e.printStackTrace();;
  
                      }
                  }
              };
              register_request register_request=new register_request(get_username,get_email,get_password,response_listener);
              RequestQueue queue=Volley.newRequestQueue(Main4Activity.this);
              queue.add(register_request);
          }
      });
  
      TextView register=(TextView)findViewById(R.id.login);
      register.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              Intent intent=new Intent(Main4Activity.this,login_activity.class);
              Main4Activity.this.startActivity(intent);
          }
      });
  }
  </code></pre>
  
  <p>}</p>
  
  <p><strong>xml</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context="com.example.collection_tutorial.Main4Activity"
  android:orientation="vertical"&gt;
  
  &lt;ProgressBar
      style="?android:attr/progressBarStyleLarge"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/progressBar"
      android:layout_centerVertical="true"
      android:layout_centerHorizontal="true"
      android:indeterminate="false"
      android:layout_gravity="center" /&gt;
  
  &lt;RelativeLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
  
      &lt;EditText
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:id="@+id/password"
          android:layout_below="@+id/email"
          android:layout_centerHorizontal="true"
          android:hint="Password"
          android:layout_margin="10dp" /&gt;
  
      &lt;EditText
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:id="@+id/username"
          android:layout_alignParentTop="true"
          android:layout_centerHorizontal="true"
          android:hint="UserName / Restaurant Name"
          android:layout_margin="10dp" /&gt;
  
      &lt;TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:textAppearance="?android:attr/textAppearanceMedium"
          android:text="Existing User? Please Login here-&gt;"
          android:id="@+id/login"
          android:layout_below="@+id/submit"
          android:layout_centerHorizontal="true"
          android:layout_margin="10dp" /&gt;
  
      &lt;Button
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:text="Submit Registration"
          android:id="@+id/submit"
          android:layout_below="@+id/password"
          android:layout_centerHorizontal="true"
          android:layout_margin="10dp" /&gt;
  
      &lt;EditText
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:id="@+id/email"
          android:layout_below="@+id/username"
          android:layout_centerHorizontal="true"
          android:hint="Email "
          android:layout_margin="10dp" /&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p></p>
  
  <p>I try to put the progressbar and 3 Edittext and button into same Relativelayout, it doesn't work either. Anyone can help?</p>