StackOverflow2013

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POHow to replace a textChangedListener in an activity
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copied!<p>For my android application, I need to change the <code>textChangedListener</code> each time a <code>RadioButton</code> switches states. There are 4 possible buttons, and a corresponding <code>EditText</code> box for each. I currently only have 2 of the 4 buttons implemented, and when I switch from an implemented button (i.e. button 1) to an unimplemented button, there is no problem. However, when I try to select another implemented button, (i.e. button 2) the application crashes.</p> <p>Bellow is some code of mine showing the implementation of my <code>textChangedListener</code>s.</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.1text); final EditText t2 = (EditText) findViewById(R.id.2text); final EditText t3 = (EditText) findViewById(R.id.3text); final EditText t4 = (EditText) findViewById(R.id.4text); 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) { %Useful stuff } }); _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) { %Different useful stuff } }); active.addTextChangedListener(_list1); last = _list1; } </code></pre> <p>Again, my problem is that when I try to switch from one <code>TextChangedListener</code> to another, my application crashes regardless of what is implemented within each listener. I feel like there is something very obvious which I am overlooking for the characteristics and implementation of the <code>TextChangeListener</code>s. Any help would be much appreciated!</p> <p>Thanks!</p> <p>My Error Log: (Note: the activity name is "Number")</p> <pre><code>01-31 08:29:17.673: INFO/ActivityManager(59): Displayed activity com.ikiar.engtools/.Number: 659 ms (total 659 ms) 01-31 08:29:24.083: DEBUG/AndroidRuntime(276): Shutting down VM 01-31 08:29:24.083: WARN/dalvikvm(276): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): FATAL EXCEPTION: main 01-31 08:29:24.103: ERROR/AndroidRuntime(276): java.lang.ClassCastException: android.text.SpannableStringBuilder 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at com.ikiar.engtools.Number$3.onTextChanged(Number.java:122) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.TextView.sendOnTextChanged(TextView.java:6131) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.TextView.setText(TextView.java:2691) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.TextView.setText(TextView.java:2556) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.EditText.setText(EditText.java:75) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.TextView.setText(TextView.java:2531) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at com.ikiar.engtools.Number$1.onCheckedChanged(Number.java:71) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.RadioGroup.setCheckedId(RadioGroup.java:172) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.RadioGroup.access$600(RadioGroup.java:52) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.RadioGroup$CheckedStateTracker.onCheckedChanged(RadioGroup.java:342) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.CompoundButton.setChecked(CompoundButton.java:127) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.CompoundButton.toggle(CompoundButton.java:86) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.RadioButton.toggle(RadioButton.java:69) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.widget.CompoundButton.performClick(CompoundButton.java:98) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.view.View$PerformClick.run(View.java:8816) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.os.Handler.handleCallback(Handler.java:587) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.os.Handler.dispatchMessage(Handler.java:92) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.os.Looper.loop(Looper.java:123) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at android.app.ActivityThread.main(ActivityThread.java:4627) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at java.lang.reflect.Method.invokeNative(Native Method) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at java.lang.reflect.Method.invoke(Method.java:521) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 01-31 08:29:24.103: ERROR/AndroidRuntime(276): at dalvik.system.NativeStart.main(Native Method) 01-31 08:29:24.113: WARN/ActivityManager(59): Force finishing activity com.ikiar.engtools/.Number 01-31 08:29:24.523: INFO/ARMAssembler(59): generated scanline__00000077:03515104_00000000_00000000 [ 33 ipp] (47 ins) at [0x3659b0:0x365a6c] in 365498 ns 01-31 08:29:24.653: WARN/ActivityManager(59): Activity pause timeout for HistoryRecord{450232b0 com.ikiar.engtools/.Number} </code></pre>

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