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@ -37,15 +37,22 @@ import net.micode.notes.R;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* 自定义笔记编辑文本框
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* 扩展自EditText,用于处理笔记中的文本编辑操作
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* 支持链接识别、键盘事件处理和文本变化监听等功能
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*/
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public class NoteEditText extends EditText {
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private static final String TAG = "NoteEditText";
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private int mIndex;
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private int mSelectionStartBeforeDelete;
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private int mIndex; // 当前编辑框在列表中的索引位置
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private int mSelectionStartBeforeDelete; // 记录删除操作前的光标位置
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// 支持的链接协议
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private static final String SCHEME_TEL = "tel:" ;
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private static final String SCHEME_HTTP = "http:" ;
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private static final String SCHEME_EMAIL = "mailto:" ;
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// 链接协议与菜单项文本资源的映射
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private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>();
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static {
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sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel);
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@ -54,38 +61,43 @@ public class NoteEditText extends EditText {
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}
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/**
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* Call by the {@link NoteEditActivity} to delete or add edit text
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* 文本视图变化监听器接口
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* 由NoteEditActivity实现,用于处理编辑文本的删除、添加和文本变化事件
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*/
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public interface OnTextViewChangeListener {
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/**
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* Delete current edit text when {@link KeyEvent#KEYCODE_DEL} happens
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* and the text is null
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* 当按下删除键且文本为空时,删除当前编辑文本
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*/
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void onEditTextDelete(int index, String text);
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/**
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* Add edit text after current edit text when {@link KeyEvent#KEYCODE_ENTER}
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* happen
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* 当按下回车键时,在当前编辑文本后添加新的编辑文本
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*/
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void onEditTextEnter(int index, String text);
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/**
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* Hide or show item option when text change
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* 当文本变化时,隐藏或显示项目选项
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*/
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void onTextChange(int index, boolean hasText);
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}
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private OnTextViewChangeListener mOnTextViewChangeListener;
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private OnTextViewChangeListener mOnTextViewChangeListener; // 文本变化监听器
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public NoteEditText(Context context) {
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super(context, null);
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mIndex = 0;
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}
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/**
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* 设置编辑框在列表中的索引位置
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*/
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public void setIndex(int index) {
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mIndex = index;
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}
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/**
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* 设置文本视图变化监听器
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*/
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public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
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mOnTextViewChangeListener = listener;
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}
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@ -96,14 +108,13 @@ public class NoteEditText extends EditText {
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public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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// TODO Auto-generated constructor stub
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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switch (event.getAction()) {
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case MotionEvent.ACTION_DOWN:
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// 计算触摸位置对应的文本偏移量并设置光标位置
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int x = (int) event.getX();
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int y = (int) event.getY();
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x -= getTotalPaddingLeft();
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@ -125,11 +136,13 @@ public class NoteEditText extends EditText {
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public boolean onKeyDown(int keyCode, KeyEvent event) {
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switch (keyCode) {
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case KeyEvent.KEYCODE_ENTER:
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// 回车键事件处理,由监听器处理
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if (mOnTextViewChangeListener != null) {
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return false;
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}
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break;
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case KeyEvent.KEYCODE_DEL:
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// 记录删除操作前的光标位置
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mSelectionStartBeforeDelete = getSelectionStart();
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break;
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default:
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@ -142,7 +155,9 @@ public class NoteEditText extends EditText {
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public boolean onKeyUp(int keyCode, KeyEvent event) {
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switch(keyCode) {
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case KeyEvent.KEYCODE_DEL:
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// 删除键事件处理
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if (mOnTextViewChangeListener != null) {
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// 如果光标在文本开头且不是第一个编辑框,则删除当前编辑框
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if (0 == mSelectionStartBeforeDelete && mIndex != 0) {
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mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString());
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return true;
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@ -152,7 +167,10 @@ public class NoteEditText extends EditText {
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}
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break;
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case KeyEvent.KEYCODE_ENTER:
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// 回车键事件处理
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if (mOnTextViewChangeListener != null) {
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// 获取光标位置之后的文本,将当前文本截断到光标位置
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// 并在后面添加新的编辑框
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int selectionStart = getSelectionStart();
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String text = getText().subSequence(selectionStart, length()).toString();
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setText(getText().subSequence(0, selectionStart));
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@ -169,6 +187,7 @@ public class NoteEditText extends EditText {
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@Override
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protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
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// 焦点变化时通知监听器文本状态
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if (mOnTextViewChangeListener != null) {
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if (!focused && TextUtils.isEmpty(getText())) {
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mOnTextViewChangeListener.onTextChange(mIndex, false);
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@ -181,15 +200,19 @@ public class NoteEditText extends EditText {
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@Override
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protected void onCreateContextMenu(ContextMenu menu) {
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// 处理上下文菜单(长按菜单)
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if (getText() instanceof Spanned) {
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// 获取选中的文本范围
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int selStart = getSelectionStart();
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int selEnd = getSelectionEnd();
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int min = Math.min(selStart, selEnd);
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int max = Math.max(selStart, selEnd);
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// 检查选中的文本中是否包含URLSpan
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final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class);
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if (urls.length == 1) {
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// 根据URL协议设置菜单项文本
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int defaultResId = 0;
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for(String schema: sSchemaActionResMap.keySet()) {
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if(urls[0].getURL().indexOf(schema) >= 0) {
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@ -202,10 +225,11 @@ public class NoteEditText extends EditText {
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defaultResId = R.string.note_link_other;
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}
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// 添加菜单项并设置点击事件
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menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener(
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new OnMenuItemClickListener() {
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public boolean onMenuItemClick(MenuItem item) {
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// goto a new intent
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// 打开链接
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urls[0].onClick(NoteEditText.this);
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return true;
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}
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@ -214,4 +238,4 @@ public class NoteEditText extends EditText {
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}
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super.onCreateContextMenu(menu);
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}
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}
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}
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