Adds TextChangedListener helper class to make working with text inputs less verbose.

app/src/main/java/com/majinnaibu/monstercards/utils/TextChangedListener.java

@@ -0,0 +1,74 @@
+package com.majinnaibu.monstercards.utils;
+
+import android.text.Editable;
+import android.text.TextWatcher;
+
+public class TextChangedListener implements TextWatcher {
+
+    private final BeforeTextChangedCallback mBeforeTextChangedCallback;
+    private final OnTextChangedCallback mOnTextChangedCallback;
+    private final AfterTextChangedCallback mAfterTextChangedCallback;
+
+    public TextChangedListener(BeforeTextChangedCallback beforeTextChangedCallback, OnTextChangedCallback onTextChangedCallback, AfterTextChangedCallback afterTextChangedCallback) {
+        mBeforeTextChangedCallback = beforeTextChangedCallback;
+        mOnTextChangedCallback = onTextChangedCallback;
+        mAfterTextChangedCallback = afterTextChangedCallback;
+    }
+
+    public TextChangedListener(OnTextChangedCallback callback) {
+        this(null, callback, null);
+    }
+
+    public TextChangedListener(BeforeTextChangedCallback callback) {
+        this(callback, null, null);
+    }
+
+    public TextChangedListener(AfterTextChangedCallback callback) {
+        this(null, null, callback);
+    }
+
+    public TextChangedListener(BeforeTextChangedCallback beforeTextChangedCallback, OnTextChangedCallback onTextChangedCallback) {
+        this(beforeTextChangedCallback, onTextChangedCallback, null);
+    }
+
+    public TextChangedListener(BeforeTextChangedCallback beforeTextChangedCallback, AfterTextChangedCallback afterTextChangedCallback) {
+        this(beforeTextChangedCallback, null, afterTextChangedCallback);
+    }
+
+    public TextChangedListener(OnTextChangedCallback onTextChangedCallback, AfterTextChangedCallback afterTextChangedCallback) {
+        this(null, onTextChangedCallback, afterTextChangedCallback);
+    }
+
+    @Override
+    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+        if (mBeforeTextChangedCallback != null) {
+            mBeforeTextChangedCallback.beforeTextChanged(s, start, count, after);
+        }
+    }
+
+    @Override
+    public void onTextChanged(CharSequence s, int start, int before, int count) {
+        if (mOnTextChangedCallback != null) {
+            mOnTextChangedCallback.onTextChanged(s, start, before, count);
+        }
+    }
+
+    @Override
+    public void afterTextChanged(Editable s) {
+        if (mAfterTextChangedCallback != null) {
+            mAfterTextChangedCallback.afterTextChanged(s);
+        }
+    }
+
+    public interface BeforeTextChangedCallback {
+        void beforeTextChanged(CharSequence s, int start, int count, int after);
+    }
+
+    public interface OnTextChangedCallback {
+        void onTextChanged(CharSequence s, int start, int before, int count);
+    }
+
+    public interface AfterTextChangedCallback {
+        void afterTextChanged(Editable s);
+    }
+}