make the result and formula textview font scale automatically

- works only in the app, not in the widget
- we have to leave the textviews as TextView type, else the widget breaks totally

app/build.gradle

@@ -25,6 +25,7 @@ dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     compile 'com.android.support:appcompat-v7:23.1.1'
     compile 'com.jakewharton:butterknife:7.0.1'
+    compile 'me.grantland:autofittextview:0.2.1'
 
     testCompile 'junit:junit:4.12'
     testCompile 'org.robolectric:robolectric:3.0'

app/src/main/java/calculator/simplemobiletools/com/simple_calculator/Formatter.java

@@ -13,7 +13,6 @@ public class Formatter {
             symbols.setDecimalSeparator('.');
 
             final DecimalFormat formatter = new DecimalFormat();
-            formatter.setMaximumIntegerDigits(12);
             formatter.setMaximumFractionDigits(12);
             formatter.setDecimalFormatSymbols(symbols);
             formatter.setGroupingUsed(false);

app/src/main/java/calculator/simplemobiletools/com/simple_calculator/MainActivity.java

@@ -10,6 +10,7 @@ import butterknife.Bind;
 import butterknife.ButterKnife;
 import butterknife.OnClick;
 import butterknife.OnLongClick;
+import me.grantland.widget.AutofitHelper;
 
 public class MainActivity extends AppCompatActivity implements Calculator {
     @Bind(R.id.result) TextView result;
@@ -24,6 +25,7 @@ public class MainActivity extends AppCompatActivity implements Calculator {
         ButterKnife.bind(this);
         calc = new CalculatorImpl(this);
         setupResultView();
+        AutofitHelper.create(result);
     }
 
     private void setupResultView() {