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    <p>I think there is some problem in your layout file. </p> <p>I have edited the code and created main.xml and changed EditText ids from 1text,2text,3text,4text to text1,text2,text3,text4 </p> <p>The code given bellow is working.</p> <p><strong>Following is the code for activity</strong></p> <pre><code> public TextWatcher last; public TextWatcher _list1; public TextWatcher _list2; public EditText active; public RadioButton checked; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final EditText t1 = (EditText) findViewById(R.id.text1); final EditText t2 = (EditText) findViewById(R.id.text2); final EditText t3 = (EditText) findViewById(R.id.text3); final EditText t4 = (EditText) findViewById(R.id.text4); final Context c = getApplicationContext(); final RadioGroup g1 = (RadioGroup) findViewById(R.id.radioGroup1); g1.setOnCheckedChangeListener(new OnCheckedChangeListener() { public void onCheckedChanged(RadioGroup group, int checkedId) { checked = (RadioButton) g1.findViewById(g1.getCheckedRadioButtonId()); if (((String) checked.getText()).equalsIgnoreCase("But1")) { active.removeTextChangedListener(last); active = t1; active.setText(""); active.addTextChangedListener(_list1); last = _list1; } else if (((String) checked.getText()).equalsIgnoreCase("But2")) { active.removeTextChangedListener(last); active = t2; active.setText(""); active.addTextChangedListener(_list2); last = _list2; } else if (((String) checked.getText()).equalsIgnoreCase("But3")) { active = t3; } else if (((String) checked.getText()).equalsIgnoreCase("But4")) { active = t4; } } }); checked = (RadioButton) g1.findViewById(g1.getCheckedRadioButtonId()); active = t1; active.setText(""); _list1 = (new TextWatcher() { public void afterTextChanged(Editable s) { } public void beforeTextChanged(CharSequence s, int start, int count, int after) { } public void onTextChanged(CharSequence s, int start, int before, int count) { Toast.makeText(c, "onTextChanged called(_list1 watcher)", Toast.LENGTH_SHORT).show(); } }); _list2 = (new TextWatcher() { public void afterTextChanged(Editable s) { } public void beforeTextChanged(CharSequence s, int start, int count, int after) { } public void onTextChanged(CharSequence s, int start, int before, int count) { Toast.makeText(c, "onTextChanged called(_list2 watcher)", Toast.LENGTH_SHORT).show(); } }); active.addTextChangedListener(_list1); last = _list1; } } </code></pre> <p><br> <strong>Following is the code for main.xml file</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;RadioGroup android:id="@+id/radioGroup1" android:layout_width="match_parent" android:layout_height="wrap_content" &gt; &lt;RadioButton android:id="@+id/But1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="But1" /&gt; &lt;EditText android:id="@+id/text1" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="text" /&gt; &lt;RadioButton android:id="@+id/But2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="But2" /&gt; &lt;EditText android:id="@+id/text2" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="text" /&gt; &lt;RadioButton android:id="@+id/But3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="But3" /&gt; &lt;EditText android:id="@+id/text3" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="text" /&gt; &lt;RadioButton android:id="@+id/But4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="But4" /&gt; &lt;EditText android:id="@+id/text4" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="text" &gt; &lt;/EditText&gt; &lt;/RadioGroup&gt; &lt;/LinearLayout&gt; </code></pre> <p>Try this. Its working.</p>
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