android TextView相關屬性及文本處理
Edittext響應onclick，因爲click事件被onTouchEvent攔截，因此經過設置touch事件監聽處理java
// et_more.setOnTouchListener(new OnTouchListener() {
// @Override
// public boolean onTouch(View v, MotionEvent event) {
// if(MotionEvent.ACTION_UP==event.getAction()){
// ....
}
// return false;
// }
// });
EditText設置enable爲false時，不響應ontouch事件，但又進行了事件攔截，沒有傳遞給parent ViewGroup ,因爲在onTouchEvent事件沒有對enable狀態判斷，android
因此事件仍然在onTouchEvent rerurn true。解決重寫EditText的onTouchEvent 增長isEnable判斷便可：git
public class EditTextTouch extends EditText {
public EditTextTouch(Context context) {
this(context, null);
}
public EditTextTouch(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return isEnabled() && super.onTouchEvent(event);
}
}
EditText代碼實現動態設置輸入類型：canvas
setInputType(InputType.TYPE_CLASS_PHONE);
setInputType(InputType.TYPE_TEXT_VARIATION_PERSON_NAME);
自定義類型 經過setKeyListener()
setKeyListener(new MyNumberType());數組
private class MyNumberType extends NumberKeyListener {
@NonNull
@Override
protected char[] getAcceptedChars() {//限制內容
char[] numberChars={'1','2','3','4','5','6','7','8','9','.','0',};
return numberChars;
}
@Override
public int getInputType() {
return android.text.InputType.TYPE_CLASS_PHONE;
}
}
限定輸入字符
xml中咱們可使用digits屬性能夠實現字符的限定，代碼中EditText提供setKeyListener(KeyListener )和setFilters(InputFilter[])兩個方法
setFilters
如限制輸入輸入字數爲8
editText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(8)});
只能輸入8位大寫字母
editText.setFilters(new InputFilter[]{new InputFilter.AllCaps(),new InputFilter.LengthFilter(8)});
InputFilter switchFilter = new InputFilter() {
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
return source.toString().toUpperCase();
}
};
editText.setFilters(new InputFilter[]{switchFilter,new InputFilter.LengthFilter(16)});
setKeyListener方式
InputFilter提供了字符過濾,KeyListener提供了對輸入鍵盤按鍵的監聽。
DigitsKeyListener、NumberKeyListener是咱們常常使用的，DigitsKeyListener繼承了NumberKeyListener,NumberKeyListener實現了InputFilter,
因此咱們在使用InputFilter的時候發現也能夠設置DigitsKeyListener和NumberKeyListenerapp
//https://blog.csdn.net/xuwb123xuwb/article/details/71081174
//https://www.jianshu.com/p/bd4273c12e5b
ide
textview 設置圖片兩種方式:
函數
TextView textView=null;
1, int flagResId = getResources().getIdentifier("icon", "drawable", getPackageName());
textView.setCompoundDrawablesWithIntrinsicBounds(flagResId, 0, 0, 0);
2， Drawable drawable = mContext.getResources().getDrawable(R.drawable.shop_arrow_down);
drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());
textView.setCompoundDrawables(null, null, drawable, null);
TextView控件的背景透明度和字體透明度
佈局
方式1， tv.setBackgroundColor(Color.argb(255, 0, 255, 0)); //背景透明度 tv.setTextColor(Color.argb(255, 0, 255, 0)); //文字透明度 方式2， tv.setTextColor(0xffff00ff);
0xffff00ff是int類型的數據，分組一下0x|ff|ff00ff，0x是表明顏色整數的標記，ff是表示透明度，ff00ff表示顏色，注意：這裏ffff00ff必須是8個的顏色表示
原理，把透明度轉換爲色值。就是根據透明度轉換爲色值，放在前兩位
post
透明度轉換能夠參照下表： 透明度 對應十六進制 100% ff 90% e6 85% d9 80% cc 70% b3 60% 99 50% 80 40% 66 30% 4d 20% 33 15% 26 10% 1a 5% 0d 0% 00
代碼設置EditText輸入限制:
public void setNumInputType(String str){
//digits="0123456789" 只數字
//"0123456789abcdefghigklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" 字母+數字
etInput.setKeyListener(DigitsKeyListener.getInstance(str));
}
// etInput.setInputType(InputType.TYPE_CLASS_NUMBER);//數字鍵盤
// InputType.TYPE_TEXT_FLAG_MULTI_LINE);//設置輸入類型和鍵盤爲英文
// etInput.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL);
one textView different text style
String s= "Hello Everyone"; SpannableString ss1= new SpannableString(s); ss1.setSpan(new RelativeSizeSpan(2f), 0,5, 0); // set size ss1.setSpan(new ForegroundColorSpan(Color.RED), 0, 5, 0);// set color TextView tv= (TextView) findViewById(R.id.textview); tv.setText(ss1);
textView.setText(Html.fromHtml("<b>myLogin</b> <i>logout</i>"));SpannableString styledString = new SpannableString("myLogin logout");
styledString.setSpan(new StyleSpan(Typeface.BOLD), 0, 7, 0);
styledString.setSpan(new StyleSpan(Typeface.ITALIC), 8, 14, 0);
tv.setText(styledString);
計算字體寬度：
public static float GetTextWidth(String text, float Size) {
TextPaint FontPaint = new TextPaint();
FontPaint.setTextSize(Size);
return FontPaint.measureText(text);
}
// 計算文本，行數，高度
FontMetrics fm = mTextView.getPaint().getFontMetrics();
mFontHeight = (int) (Math.ceil(fm.descent - fm.top) + 2);// 得到每行高度
mPageLineNum = (int) (mTextHeight / mFontHeight);// 得到行數
//TextView 分頁設置相關
getLineBounds(int line, Rect bounds) // 獲得指定行的邊界
只要從第一行開始一行一行往下看, 直到找到超出邊界的那一行, 就能知道這個 TextView 能顯示多少行了.
或者用 getHeight() / getLineHeight() 也能獲取 TextView 的最大顯示行數
getLineForVertical(int vertical) // 根據縱座標獲得對應的行號
getLineEnd(int line) // 返回指定行中最後一個字在整個字符串中的位置
一個TextView設置多種顏色文字
Html.fromHtml(String.format(formate, getColorText(params, color)));
public class ReadView extends TextView {
// 構造函數略...
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
resize();
}
/**
* 去除當前頁沒法顯示的字
* @return 去掉的字數
*/
public int resize() {
CharSequence oldContent = getText();
CharSequence newContent = oldContent.subSequence(0, getCharNum());
setText(newContent);
return oldContent.length() - newContent.length();
}
/**
* 獲取當前頁總字數
*/
public int getCharNum() {
return getLayout().getLineEnd(getLineNum());
}
/**
* 獲取當前頁總行數
*/
public int getLineNum() {
Layout layout = getLayout();
int topOfLastLine = getHeight() - getPaddingTop() - getPaddingBottom() - getLineHeight();
return layout.getLineForVertical(topOfLastLine);
}
}
//TextView設置完setMaxLines後，經過TextView.getHeight方法獲取的是當前行數的高度，而非文字徹底顯示的高度
//實際獲取高度方法
/**
*
* @param pTextView
* @return
*/
private int getTextViewHeight(TextView pTextView) {
Layout layout = pTextView.getLayout();
int desired = layout.getLineTop(pTextView.getLineCount());
int padding = pTextView.getCompoundPaddingTop() + pTextView.getCompoundPaddingBottom();
return desired + padding;
}
//自定義View繪製文本時，格式化文本內容StaticLayout實現：
public void onDraw(Canvas canvas){
super.onDraw(canvas);
TextPaint tp = new TextPaint();
tp.setColor(Color.BLUE);
tp.setStyle(Style.FILL);
tp.setTextSize(50);
String message = "paint,draw paint指用顏色畫,如油畫顏料、水彩或者水墨畫,而draw 一般指用鉛筆、鋼筆或者粉筆畫,後者通常並不塗上顏料。兩動詞的相應名詞分別爲p";
StaticLayout myStaticLayout = new StaticLayout(message, tp, canvas.getWidth(), Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
myStaticLayout.draw(canvas);
canvas.restore();
}
自定義view繪製文本計算文本寬度高度：
private Rect mBounds = new Rect();
String text = String.valueOf(mCount);
mPaint.getTextBounds(text, 0, text.length(), mBounds);
float textWidth = mBounds.width();
float textHeight = mBounds.height();
canvas.drawText(text, getWidth() / 2 - textWidth / 2, getHeight() / 2 + textHeight / 2, mPaint);
文本分割處理
/**
* 自動分割文本
* @param content 須要分割的文本
* @param p 畫筆，用來根據字體測量文本的寬度
* @param width 最大的可顯示像素（通常爲控件的寬度）
* @return 一個字符串數組，保存每行的文本
*/
public static String[] autoSplitText(String content, Paint p, int width) {
float textWidth = p.measureText(content);
if(textWidth <= width) {
return new String[]{content};
}
int length = content.length();
int start = 0, end = 1, i = 0;
int lines = (int) Math.ceil(textWidth / width); //計算行數
String[] lineTexts = new String[lines];
while(start < length) {
if(p.measureText(content, start, end) > width) { //文本寬度超出控件寬度時
lineTexts[i++] = content.substring(start, end);//(String) content.subSequence(start, end);
start = end;
}
if(end == length) { //不足一行的文本
lineTexts[i] = content.substring(start, end);//(String) content.subSequence(start, end);
break;
}
end += 1;
}
return lineTexts;
}
TextView字體間距
一、android:lineSpacingExtra
設置行間距，如」3dp」。
二、android:lineSpacingMultiplier
設置行間距的倍數，如」1.2″。
設置texview 垂直滾動條
android:focusable="true"
android:focusableInTouchMode="true"
android:ellipsize="marquee"
android:marqueeRepeatLimit="marquee_forever"
android:scrollbars="vertical"
android:singleLine="false"
設置textview 文字水平自動滾動（跑馬燈效果）
<com.example.playpic.MyTextView
android:id="@+id/myTv"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textColor="#000000"
android:focusable="true"
android:focusableInTouchMode="true"
android:scrollHorizontally="true"
android:ellipsize="marquee"
android:marqueeRepeatLimit="marquee_forever"
android:singleLine="true"
/>
佈局文件需添加屬性：android:addStatesFromChildren="true"
修改的textview
public class MyTextView extends TextView {
public MyTextView(Context context) {
super(context);
}
public MyTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
}
@Override
public boolean isFocused() {
return true;
}
}
setContentView(R.layout.scrollview1);
MyTextView tv=(MyTextView)findViewById(R.id.myTv);
tv.setText(str);
tv.setMovementMethod(ScrollingMovementMethod.getInstance());
android 動態設置TextView值，例：金額增長
public static void autoIncrement(final TextView target, final float start,
final float end, long duration) {
ValueAnimator animator = ValueAnimator.ofFloat(start, end);
animator.addUpdateListener(new AnimatorUpdateListener() {
private FloatEvaluator evalutor = new FloatEvaluator();
private DecimalFormat format = new DecimalFormat("####0.0#");
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float fraction = animation.getAnimatedFraction();
float currentValue = evalutor.evaluate(fraction, start, end);
target.setText(format.format(currentValue));
}
});
animator.setDuration(duration);
animator.start();
}
Textview 設置maxLines>1時，超出部份內容沒...省略號解決方法
解決方案：1，自定義實現，2，經過post(Runable r)即在Textview設置文字後顯示完計算處理
class OmitTextViewDeal implements Runnable{
TextView tv;
String txt;
public GoodsAttributeTextViewDeal(){
}
@Override
public void run() {
float txtLen=tv.getPaint().measureText(txt);
int tvLen=tv.getWidth();
int lines=Math.round(txtLen/tvLen+0.9f);
if(lines>2){
String[] splitContent= UtilsView.autoSplitText(txt,tv.getPaint(),tvLen);
String ts=splitContent[1].substring(0,splitContent[1].length()-5);
String showTxt=splitContent[0]+ts+"...";
tv.setText(showTxt);
}
}
}
public static String[] autoSplitText(String content, Paint p, int width) {
float textWidth = p.measureText(content);
if(textWidth <= width) {
return new String[]{content};
}
int length = content.length();
int start = 0, end = 1, i = 0;
int lines = (int) Math.ceil(textWidth / width); //計算行數
String[] lineTexts = new String[lines];
while(start < length) {
if(p.measureText(content, start, end) > width) { //文本寬度超出控件寬度時
lineTexts[i++] = content.substring(start, end);//(String) content.subSequence(start, end);
start = end;
}
if(end == length) { //不足一行的文本
lineTexts[i] = content.substring(start, end);//(String) content.subSequence(start, end);
break;
}
end += 1;
}
return lineTexts;
}
使用：
tv_attr.setText(txtAttr);
OmitTextViewDeal attrTvDeal=new OmitTextViewDeal();
attrTvDeal.tv=tv_attr;
attrTvDeal.txt=txtAttr;
holder.tv_attr.post(attrTvDeal);
文本分割處理
/**
* 在文字信息繪製前對文本信息進行文字分割，文字間距，文字位置計算處理
* @param text
*/
private void initDrawText(String text){
if(texts==null){
texts=getTexts(text);
}
if(tposy==null){
tposy=getTextLinePosy();
}
if(stepBack==null){
stepBack=new Float[tposy.length];
int i=0;
float interval=0.0f;
FontMetrics fm = textPaint.getFontMetrics();
float baseline = fm.descent - fm.ascent;
while(i<stepBack.length){
stepBack[i]=interval;
interval-=baseline;
i++;
}
}
if(step==null){
step=stepBack.clone();
}
}
/**
* 獲取分割後的文本信息
* @param text
* @return
*/
private String[] getTexts(String text){
if(text.contains("\n")){
List<String> totalList=new ArrayList<String>(10);
String[] str=text.split("\n");
int len=str.length;
for(int i=0;i<len;i++){
String[] ss=autoSplit(str[i], textPaint, getWidth()/3*2);
for(String s:ss){
totalList.add(s);
}
}
if(texts==null)
texts=(String[]) totalList.toArray(new String[0]);
}
else
texts=autoSplit(text, textPaint, getWidth()/3*2);
return texts;
}
/**
* 獲取每行文本的縱座標信息
* @return
*/
private Float[] getTextLinePosy(){
FontMetrics fm = textPaint.getFontMetrics();
float baseline = fm.descent - fm.ascent;
float y = posy+baseline; //因爲系統基於字體的底部來繪製文本，全部須要加上字體的高度
int len=texts.length;
Float[] groups=new Float[len];
for(int i=0;i<len;i++) {
groups[i]=y;
y =y+ baseline + fm.leading; //添加字體行間距
}
return groups;
}
/**
* 自動分割文本
* @param content 須要分割的文本
* @param p 畫筆，用來根據字體測量文本的寬度
* @param width 最大的可顯示像素（通常爲控件的寬度）
* @return 一個字符串數組，保存每行的文本
*/
private String[] autoSplit(String content, Paint p, float width) {
float textWidth = p.measureText(content);
if(textWidth <= width) {
return new String[]{content};
}
int length = content.length();
int start = 0, end = 1, i = 0;
int lines = (int) Math.ceil(textWidth / width); //計算行數
String[] lineTexts = new String[lines];
while(start < length) {
if(p.measureText(content, start, end) > width) { //文本寬度超出控件寬度時
lineTexts[i++] = content.substring(start, end);//(String) content.subSequence(start, end);
start = end;
}
if(end == length) { //不足一行的文本
lineTexts[i] = content.substring(start, end);//(String) content.subSequence(start, end);
break;
}
end += 1;
}
return lineTexts;
}
大文本分頁顯示處理:
package sharedcode.turboeditor.texteditor;
import android.content.Context;
import java.util.LinkedList;
import java.util.List;
import sharedcode.turboeditor.preferences.PreferenceHelper;
public class PageSystem {
private List<String> pages;
private int[] startingLines;
private int currentPage = 0;
private PageSystemInterface pageSystemInterface;
public PageSystem(Context context, PageSystemInterface pageSystemInterface, String text) {
final int charForPage = 20000;
final int firstPageChars = 50000;
this.pageSystemInterface = pageSystemInterface;
pages = new LinkedList<>();
int i = 0;
int to;
int nextIndexOfReturn;
final int textLength = text.length();
boolean pageSystemEnabled = PreferenceHelper.getSplitText(context);
if (pageSystemEnabled) {
while (i < textLength) {
// first page is longer
to = i + (i == 0 ? firstPageChars : charForPage);
nextIndexOfReturn = text.indexOf("\n", to);
if (nextIndexOfReturn > to) to = nextIndexOfReturn;
if (to > text.length()) to = text.length();
pages.add(text.substring(i, to));
i = to + 1;
}
if (i == 0)
pages.add("");
} else {
pages.add(text);
}
startingLines = new int[pages.size()];
setStartingLines();
}
public int getStartingLine() {
return startingLines[currentPage];
}
public String getCurrentPageText() {
return pages.get(currentPage);
}
public String getTextOfNextPages(boolean includeCurrent, int nOfPages) {
StringBuilder stringBuilder = new StringBuilder();
int i;
for (i = includeCurrent ? 0 : 1; i < nOfPages; i++) {
if (pages.size() > (currentPage + i)) {
stringBuilder.append(pages.get(currentPage + 1));
}
}
return stringBuilder.toString();
}
public void savePage(String currentText) {
pages.set(currentPage, currentText);
}
public void nextPage() {
if (!canReadNextPage()) return;
goToPage(currentPage + 1);
}
public void prevPage() {
if (!canReadPrevPage()) return;
goToPage(currentPage - 1);
}
public void goToPage(int page) {
if (page >= pages.size()) page = pages.size() - 1;
if (page < 0) page = 0;
boolean shouldUpdateLines = page > currentPage && canReadNextPage();
if (shouldUpdateLines) {
String text = getCurrentPageText();
int nOfNewLineNow = (text.length() - text.replace("\n", "").length()) + 1; // normally the last line is not counted so we have to add 1
int nOfNewLineBefore = startingLines[currentPage + 1] - startingLines[currentPage];
int difference = nOfNewLineNow - nOfNewLineBefore;
updateStartingLines(currentPage + 1, difference);
}
currentPage = page;
pageSystemInterface.onPageChanged(page);
}
public void setStartingLines() {
int i;
int startingLine;
int nOfNewLines;
String text;
startingLines[0] = 0;
for (i = 1; i < pages.size(); i++) {
text = pages.get(i - 1);
nOfNewLines = text.length() - text.replace("\n", "").length() + 1;
startingLine = startingLines[i - 1] + nOfNewLines;
startingLines[i] = startingLine;
}
}
public void updateStartingLines(int fromPage, int difference) {
if (difference == 0)
return;
int i;
if (fromPage < 1) fromPage = 1;
for (i = fromPage; i < pages.size(); i++) {
startingLines[i] += difference;
}
}
public int getMaxPage() {
return pages.size() - 1;
}
public int getCurrentPage() {
return currentPage;
}
public String getAllText(String currentPageText) {
pages.set(currentPage, currentPageText);
int i;
StringBuilder allText = new StringBuilder();
for (i = 0; i < pages.size(); i++) {
allText.append(pages.get(i));
if(i < pages.size() - 1)
allText.append("\n");
}
return allText.toString();
}
public boolean canReadNextPage() {
return currentPage < pages.size() - 1;
}
public boolean canReadPrevPage() {
return currentPage >= 1;
}
public interface PageSystemInterface {
void onPageChanged(int page);
}
}
use page:
InputStream inputStream = getContentResolver().openInputStream(uri);
if(inputStream != null) {
buffer = new BufferedReader(new InputStreamReader(inputStream, encoding));
}
if (buffer != null) {
while((line = buffer.readLine()) != null) {
stringBuilder.append(line);
stringBuilder.append("\n");
}
buffer.close();
fileText = stringBuilder.toString();
}
pageSystem = new PageSystem(MainActivity.this, MainActivity.this, fileText);
pageSystem.goToPage(value);
mEditor.setText(pageSystem.getCurrentPageText());
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