自己定义绘制android EditText的背景，定义EditText文字的显示样式 _EditText

博观而约取，厚积而薄发。这篇文章主要讲述自己定义绘制android EditText的背景，定义EditText文字的显示样式相关的知识，希望能为你提供帮助。
EditText能够通过layer-list来绘制背景:

< ?
【自己定义绘制android EditText的背景，定义EditText文字的显示样式】xml version=" 1.0" encoding=" utf-8" ?
> < layer-list xmlns:android=" http://schemas.android.com/apk/res/android" > < item> < shape android:shape=" rectangle" //框为矩形 > < solid android:color=" #FFFFFF" /> //用白色来填充里面 < stroke //边框是1dp的线 android:width=" 1dp" android:color=" #AEAEAE" /> < corners android:radius=" 10dp" /> //边框的圆角的弧度 < /shape> < /item> < /layer-list>

写Layout:

< RelativeLayout xmlns:android=" http://schemas.android.com/apk/res/android" xmlns:tools=" http://schemas.android.com/tools" android:layout_width=" match_parent" android:layout_height=" match_parent" android:paddingBottom=" @dimen/activity_vertical_margin" android:paddingLeft=" @dimen/activity_horizontal_margin" android:paddingRight=" @dimen/activity_horizontal_margin" android:paddingTop=" @dimen/activity_vertical_margin" android:background=" #FFFFFF" > < include layout=" @layout/title_list" /> < View android:layout_below=" @id/title" android:id=" @+id/line" android:layout_width=" fill_parent" android:layout_height=" 2dip" android:background=" @drawable/rc_list_divider" /> < RelativeLayout android:layout_width=" fill_parent" android:layout_height=" 150dp" android:layout_marginLeft=" 20dp" android:layout_marginRight=" 20dp" android:layout_centerInParent=" true" > < EditText android:id=" @+id/custom_edittext" android:layout_width=" fill_parent" android:layout_height=" 150dp" //跟parent height一致所以left_word_num能够在背景框里面 android:background=" @drawable/reply_custom_message_edit_background" android:gravity=" left|top" android:hint=" please inputsomething" android:paddingBottom=" 24dp" android:paddingLeft=" 12dp" android:paddingRight=" 12dp" android:paddingTop=" 17dp" android:textColor=" #000000" android:textColorHint=" #AEAEAE" android:textSize=" 20sp" /> < TextView android:id=" @+id/other_char_hint" android:layout_width=" wrap_content" android:layout_height=" wrap_content" android:layout_alignBottom=" @id/custom_edittext" android:layout_alignParentBottom=" true" android:paddingBottom=" 10dp" android:paddingLeft=" 12dp" android:text=" 0" android:textColor=" #AEAEAE" android:textSize=" 14sp" android:visibility=" gone" > < /TextView> < TextView android:id=" @+id/left_word_num" android:layout_width=" wrap_content" android:layout_height=" wrap_content" android:layout_alignParentBottom=" true" android:layout_alignParentRight=" true" android:paddingBottom=" 10dp" android:paddingRight=" 10dp" android:text=" 200" android:textColor=" #000000" android:textSize=" 14sp" > < /TextView> < /RelativeLayout> < /RelativeLayout>

代码中实现一些EditText变化的时候处理逻辑(眼下的逻辑是不让输入中文字符:

private EditText mCustom_edittext; private TextView left_word_num; private static final int MAX_INPUT_NUM = 200; private TextView other_char_hint; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.edittext); mCustom_edittext = (EditText)findViewById(R.id.custom_edittext); other_char_hint = (TextView)findViewById(R.id.other_char_hint); other_char_hint.setText(" only enlish accepted" ); left_word_num = (TextView) findViewById(R.id.left_word_num); mCustom_edittext.addTextChangedListener(new TextWatcher() {private CharSequence temp; private int selectionStart; private int selectionEnd; @Override public void onTextChanged(CharSequence s, int start, int before, int count) { }@Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { temp = s; }@Override public void afterTextChanged(Editable s) { selectionStart = mCustom_edittext.getSelectionStart(); selectionEnd = mCustom_edittext.getSelectionEnd(); String lastword = s.toString().trim(); if (lastword.length() > 0) { lastword = lastword.substring(lastword.length() - 1, lastword.length()); if(!isContentValid(temp.toString())) { other_char_hint.setVisibility(View.VISIBLE); for(int i=0; i < temp.toString().length(); i++) { String temp1 = temp.toString().substring(i, i+1); if(!isInputValid(temp1)) { //使用setSpan使EditText字底下画黑线 s.setSpan(new UnderlineSpan(), i, i+1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); } } }else{ other_char_hint.setVisibility(View.GONE); }}else{ other_char_hint.setVisibility(View.GONE); } left_word_num.setText(String.valueOf(MAX_INPUT_NUM - temp.length())); }}); } private boolean isContentValid(String content) { for(int i=0; i < content.length(); i++) { String value = https://www.songbingjia.com/android/content.substring(i,i+1); if(!isInputValid(value)) { return false; } } return true; } private boolean isInputValid(String s) { byte[] ch_array = s.getBytes(); if (ch_array.length == 1) { return true; } else { return false; } }

效果图: