添加文本监听器造成未发现异常

Question

在NewTweetActivity.java，我有：

@Override 
public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.newtweet); 
    listenToChange(); 
} 

public void listenToChange(){ 
    TextView cEditText = (TextView) findViewById(R.id.tweetCountTextView); 
    EditText tView = (EditText) findViewById(R.id.tweetComposerEditText); 
    tView.addTextChangedListener(new TextWatcher() { 

     public void afterTextChanged(Editable s) { 
      int len = (140 - s.length()); 
      cEditText.setText(len); 
     } 

     public void beforeTextChanged(CharSequence arg0, int arg1, 
       int arg2, int arg3) { 
      // TODO Auto-generated method stub 

     } 

     public void onTextChanged(CharSequence arg0, int arg1, int arg2, 
       int arg3) { 
      // TODO Auto-generated method stub 

     } 
    }); 
} 

然而，它要求我声明cEditText作为最终，但是当我做，它无法加载newtweet布局。

如果我把里面的afterTextChanged的cEditText声明，它加载的布局，但是当我触发afterTextChanged（由EditText上键入），它会导致这样的：

07-08 20:44:27.054: E/AndroidRuntime(4417): FATAL EXCEPTION: main 
07-08 20:44:27.054: E/AndroidRuntime(4417): android.content.res.Resources$NotFoundException: String resource ID #0x8b 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.content.res.Resources.getText(Resources.java:201) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.widget.TextView.setText(TextView.java:2911) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at com.jgnzapps.quark.NewTweetActivity$1.afterTextChanged(NewTweetActivity.java:31) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.widget.TextView.sendAfterTextChanged(TextView.java:6532) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:6720) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.text.SpannableStringBuilder.sendTextHasChanged(SpannableStringBuilder.java:897) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:353) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:269) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:432) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:409) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:28) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:654) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.view.inputmethod.BaseInputConnection.setComposingText(BaseInputConnection.java:415) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:318) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:75) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.os.Looper.loop(Looper.java:130) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at android.app.ActivityThread.main(ActivityThread.java:3694) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at java.lang.reflect.Method.invoke(Method.java:507) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
07-08 20:44:27.054: E/AndroidRuntime(4417):  at dalvik.system.NativeStart.main(Native Method) 

如果我称之为setText方法的cEditText与一个字符串（例如“猫”），它的工作原理。

任何想法？

Answer 1

这个问题很简单：你试图将int设置为Text而不是String。 因此，android执行此方法：http://developer.android.com/reference/android/widget/TextView.html#setText(int) 这意味着它搜索具有给定id的String-resource，该id不存在。

你应该设置文字是这样的：

int len = (140 - s.length()); 
cEditText.setText(String.valueOf(len));