Create SimpleTextWatcher.java

Author: Zenlua

app/src/main/java/com/example/fileselector/SimpleTextWatcher.java

@@ -0,0 +1,19 @@
+package com.example.fileselector;
+
+import android.text.Editable;
+import android.text.TextWatcher;
+
+public abstract class SimpleTextWatcher implements TextWatcher {
+    @Override
+    public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
+
+    @Override
+    public void onTextChanged(CharSequence s, int start, int before, int count) {}
+
+    @Override
+    public void afterTextChanged(Editable s) {
+        onTextChanged(s.toString());
+    }
+
+    public abstract void onTextChanged(String text);
+}