title: How to I get value text inside of button by using one function
body: <p>I have many button look like keyboard. that contain with diference text inside example: 0123456789abcdefghijkl...
  what I want is how to implement click one of them I get value text inside of button by using one function FilterBusinessKeyboard</p>
  
  <pre><code>&lt;LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="horizontal"
      &gt;
          &lt;Button
                android:layout_width="match_parent"
                android:layout_height="@dimen/button_height"
                android:layout_margin="1dp"
                android:layout_weight="1"
                android:text="0"
                android:background="@drawable/btn_key"
                android:onClick="FilterBusinessKeyboard"
                /&gt;
         &lt;Button
                android:layout_width="match_parent"
                android:layout_height="@dimen/button_height"
                android:layout_margin="1dp"
                android:layout_weight="1"
                android:text="1"
                android:background="@drawable/btn_key"
                android:onClick="FilterBusinessKeyboard"
                /&gt;
  .......
  &lt;/LinearLayout&gt;
  </code></pre>