当用户按空格键时，我正在创建一个MultiAutoCompleteTextView自定义控件，我正在创建芯片文本。
我不希望用户在文本框为空时最初输入空格，所以我放了inputFilter以防止用户最初放置空间。
这是过滤代码：
private void RestrictUselessSpaces(){
InputFilter filter = new InputFilter() {
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
for (int i = start; i < end; i++) {
if (Character.isWhitespace(source.charAt(i))) {
if(!getText().toString().trim().equals(""))
{
return " ";
}
else
{
return "";
}
}
}
return null;
}
};
setFilters(new InputFilter[]{filter});
}
当我评论RestrictUselessSpaces函数时。它工作正常。但是当这个功能运行时。比如果我尝试在角色后进入空间。它给了我indexoutofboundexception错误。这是我的代码，我收到错误。
public void setChips(String s){
if(s.contains(" ") && !s.trim().equals("")) // check space in string
{
this.chips = s.trim().split(" ");
SpannableStringBuilder ssb = new SpannableStringBuilder(getText());
// split string wich comma
int x =0;
// loop will generate ImageSpan for every country name separated by comma
for(String c : chips){
// inflate chips_edittext layout
LayoutInflater lf = (LayoutInflater) getContext().getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
TextView textView = (TextView) lf.inflate(R.layout.chips_edittext, null);
textView.setText(c); // set text
setFlags(textView, c); // set flag image
// capture bitmapt of genreated textview
int spec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
textView.measure(spec, spec);
textView.layout(0, 0, textView.getMeasuredWidth(), textView.getMeasuredHeight());
Bitmap b = Bitmap.createBitmap(textView.getWidth(), textView.getHeight(),Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(b);
canvas.translate(-textView.getScrollX(), -textView.getScrollY());
textView.draw(canvas);
textView.setDrawingCacheEnabled(true);
Bitmap cacheBmp = textView.getDrawingCache();
Bitmap viewBmp = cacheBmp.copy(Bitmap.Config.ARGB_8888, true);
textView.destroyDrawingCache(); // destory drawable
// create bitmap drawable for imagespan
BitmapDrawable bmpDrawable = new BitmapDrawable(viewBmp);
bmpDrawable.setBounds(0, 0,bmpDrawable.getIntrinsicWidth(),bmpDrawable.getIntrinsicHeight());
// create and set imagespan
ssb.setSpan(new ImageSpan(bmpDrawable),x ,x + c.length() , Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
x = x+ c.length() +1;
}
// set chips span
setText(ssb);
// move cursor to last
setSelection(s.length());
}
}
行ssb.setSpan导致问题，但是当我调试代码时。调试器运行此行而不给我任何异常。执行此功能后发生错误，这使我更难以确定实际导致问题的原因。
这是我的logcat：
08-10 20:04:19.253: E/AndroidRuntime(18461): FATAL EXCEPTION: main
08-10 20:04:19.253: E/AndroidRuntime(18461): Process: com.example.twitter, PID: 18461
08-10 20:04:19.253: E/AndroidRuntime(18461): java.lang.IndexOutOfBoundsException: setSpan (2 ... 2) ends beyond length 1
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.text.SpannableStringBuilder.checkRange(SpannableStringBuilder.java:1016)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:592)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:588)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.text.Selection.setSelection(Selection.java:76)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.text.Selection.setSelection(Selection.java:87)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.widget.EditText.setSelection(EditText.java:94)
08-10 20:04:19.253: E/AndroidRuntime(18461): at com.example.libraries.ChipsMultiAutoCompleteTextview.setChips(ChipsMultiAutoCompleteTextview.java:281)
08-10 20:04:19.253: E/AndroidRuntime(18461): at com.example.libraries.ChipsMultiAutoCompleteTextview$1.onTextChanged(ChipsMultiAutoCompleteTextview.java:192)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.widget.TextView.sendOnTextChanged(TextView.java:7429)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.widget.TextView.handleTextChanged(TextView.java:7488)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:9203)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:962)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:496)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:435)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:30)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:675)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.view.inputmethod.BaseInputConnection.commitText(BaseInputConnection.java:197)
08-10 20:04:19.253: E/AndroidRuntime(18461): at com.android.internal.widget.EditableInputConnection.commitText(EditableInputConnection.java:183)
08-10 20:04:19.253: E/AndroidRuntime(18461): at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:279)
08-10 20:04:19.253: E/AndroidRuntime(18461): at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.os.Handler.dispatchMessage(Handler.java:102)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.os.Looper.loop(Looper.java:212)
08-10 20:04:19.253: E/AndroidRuntime(18461): at android.app.ActivityThread.main(ActivityThread.java:5151)
08-10 20:04:19.253: E/AndroidRuntime(18461): at java.lang.reflect.Method.invokeNative(Native Method)
08-10 20:04:19.253: E/AndroidRuntime(18461): at java.lang.reflect.Method.invoke(Method.java:515)
08-10 20:04:19.253: E/AndroidRuntime(18461): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)
08-10 20:04:19.253: E/AndroidRuntime(18461): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
08-10 20:04:19.253: E/AndroidRuntime(18461): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
尝试使用此
setSelection(s.length() - 1);