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Android EditText禁止输入中文字符

只允许EditText输入数字或者email格式字符是非常简单的（详见API文档）。要实现只允许输入自定的数字字符也是很容易的（详见API文档，[setKeyListener(KeyListener)](http://blog.csdn.net/reference/android/widget/TextView.html#setKeyListener(android.text.method.KeyListener)) 和setFilters ([InputFilter[]](http://blog.csdn.net/reference/android/text/InputFilter.html) filters) ）。但是要限制只能输入指定的字母字符就非常的困难。 /** InputFilter[] ifs = {new InputFilter.LengthFilter(10),new DigitsKeyListener(true,true)}; editText01.setFilters(ifs); **/   发现，**[Android](http://lib.csdn.net/base/15):digits**的参数是一个字符串，没有更多的语义检查，因此想到内部处理很可能仅是简单的检查，输入的字符是否在给定的字符串中（要我设计，我就这样做）。尝试着给它指定带有英文字符的参数，发现果然如此。万幸，万幸！在layout.xml里 **[xml]** [view plain](http://blog.csdn.net/jdsjlzx/article/details/6762751#) [copy](http://blog.csdn.net/jdsjlzx/article/details/6762751#) <div> <embed id="ZeroClipboardMovie_1" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_1"> </embed> </div> </div> </div> - <EditText - android:id=“@+id/register_userName_editText” - style=“@style/register_editText_style” - android:digits=“@string/register_name_digits” - android:textColor=“@drawable/register_edit_text_textColor” - android:textColorHint=“@drawable/register_hint_text_textColor” - android:hint=“@string/register_name_hint_text” - />   在string.xml里   **[xml]** [view plain](http://blog.csdn.net/jdsjlzx/article/details/6762751#) [copy](http://blog.csdn.net/jdsjlzx/article/details/6762751#) <div> <embed id="ZeroClipboardMovie_2" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_2"> </embed> </div> </div> </div> - <string name=“register_name_digits”> - - ._0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLIMNOPQRSTUVWXYZ - - </string>         Java代码 - editText01.addTextChangedListener(new TextWatcher() { - String tmp = “”; - String digits = “abcdef”; - @Override - public void onTextChanged(CharSequence s, int start, int before, int count) { - } - @Override - public void beforeTextChanged(CharSequence s, int start, int count, int after) { - tmp = s.toString(); - } - - @Override - public void afterTextChanged(Editable s) { - Log.d(Sample4Main.TAG, “<><>afterTextChanged<><>” + s.toString()); - - String str = s.toString(); - if(str.equals(tmp)){ - return; - } - - StringBuffer sb = new StringBuffer(); - for(int i = ; i < str.length(); i++){ - if(digits.indexOf(str.charAt(i)) >= ){ - sb.append(str.charAt(i)); - } - } - tmp = sb.toString(); - editText01.setText(tmp); - } - });

【Android】自定义控件让TextView的drawableLeft与文本一起居中显示

前言 TextView的drawableLeft、drawableRight和drawableTop是一个常用、好用的属性，可以在文本的上下左右放置一个图片，而不使用更加复杂布局就能达到，我也常常喜欢用RadioButton的这几个属性实现很多效果，但是苦于不支持让drawbleLeft与文本一起居中，设置gravity为center也无济于事，终于有空研究了一下，这里与大家一起分享。声明欢迎转载，请注明出处！博客园：http://www.cnblogs.com/ 农民伯伯： http://www.cnblogs.com/over140/ 正文一、效果图二、实现代码自定义控件 ![复制代码](http://common.cnblogs.com/images/copycode.gif) /** * drawableLeft与文本一起居中显示 * * @author 农民伯伯 * @see http://www.cnblogs.com/over140/p/3464348.html * */ public class DrawableCenterTextView extends TextView { public DrawableCenterTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public DrawableCenterTextView(Context context, AttributeSet attrs) { super(context, attrs); } public DrawableCenterTextView(Context context) { super(context); } @Override protected void onDraw(Canvas canvas) { Drawable[] drawables = getCompoundDrawables(); if (drawables != null) { Drawable drawableLeft = drawables[0]; if (drawableLeft != null) { float textWidth = getPaint().measureText(getText().toString()); int drawablePadding = getCompoundDrawablePadding(); int drawableWidth = 0; drawableWidth = drawableLeft.getIntrinsicWidth(); float bodyWidth = textWidth + drawableWidth + drawablePadding; } } super.onDraw(canvas); } } ...

Android share绘制虚线在手机上显示实线问题

可以说这是一个Bug, 据说在4.0以上机器会出现，我测试是android 4.4.2 Xml代码 <embed src="http://wv1124.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf" type="application/x-shockwave-flash" width="14" height="15"> </embed> <a title="收藏这段代码">![收藏代码](http://wv1124.iteye.com/images/icon_star.png)</a> </div> - <?xml version=“1.0” encoding=“utf-8”?> - <shape xmlns:android=“http://schemas.android.com/apk/res/android” - android:shape=“line” > - - <stroke - android:dashGap=“3dp” - android:dashWidth=“8dp” - android:width=“1dp” - android:color=“#999999” /> - - <size android:height=“1dp” /> - - </shape> layout中引用： ...

InputStream与String,Byte之间互转

本文将介绍InputStream与String,Byte之间的相互转换。以代码来说明： **[html]** [view plain](http://blog.csdn.net/cjjky/article/details/6892443#) [copy](http://blog.csdn.net/cjjky/article/details/6892443#) <div> <embed id="ZeroClipboardMovie_1" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_1"> </embed> </div> </div> - import java.io.ByteArrayInputStream; - import java.io.ByteArrayOutputStream; - import java.io.IOException; - import java.io.InputStream; - - /** - * - * @author Andy.Chen - * @mail Chenjunjun.ZJ@gmail.com - * - */ - public class InputStreamUtils { - - final static int BUFFER_SIZE = 4096; - - /** - * 将InputStream转换成String - * @param in InputStream - * @return String - * @throws Exception - * - */ - public static String InputStreamTOString(InputStream in) throws Exception{ - - ByteArrayOutputStream outStream = new ByteArrayOutputStream(); - byte[] data = new byte[BUFFER_SIZE]; - int count = -1; - while((count = in.read(data,0,BUFFER_SIZE)) != -1) - outStream.write(data, 0, count); - - data = null; - return new String(outStream.toByteArray(),”ISO-8859-1″); - } - - /** - * 将InputStream转换成某种字符编码的String - * @param in - * @param encoding - * @return - * @throws Exception - */ - public static String InputStreamTOString(InputStream in,String encoding) throws Exception{ - - ByteArrayOutputStream outStream = new ByteArrayOutputStream(); - byte[] data = new byte[BUFFER_SIZE]; - int count = -1; - while((count = in.read(data,0,BUFFER_SIZE)) != -1) - outStream.write(data, 0, count); - - data = null; - return new String(outStream.toByteArray(),”ISO-8859-1″); - } - - /** - * 将String转换成InputStream - * @param in - * @return - * @throws Exception - */ - public static InputStream StringTOInputStream(String in) throws Exception{ - - ByteArrayInputStream is = new ByteArrayInputStream(in.getBytes(“ISO-8859-1”)); - return is; - } - - /** - * 将InputStream转换成byte数组 - * @param in InputStream - * @return byte[] - * @throws IOException - */ - public static byte[] InputStreamTOByte(InputStream in) throws IOException{ - - ByteArrayOutputStream outStream = new ByteArrayOutputStream(); - byte[] data = new byte[BUFFER_SIZE]; - int count = -1; - while((count = in.read(data,0,BUFFER_SIZE)) != -1) - outStream.write(data, 0, count); - - data = null; - return outStream.toByteArray(); - } - - /** - * 将byte数组转换成InputStream - * @param in - * @return - * @throws Exception - */ - public static InputStream byteTOInputStream(byte[] in) throws Exception{ - - ByteArrayInputStream is = new ByteArrayInputStream(in); - return is; - } - - /** - * 将byte数组转换成String - * @param in - * @return - * @throws Exception - */ - public static String byteTOString(byte[] in) throws Exception{ - - InputStream is = byteTOInputStream(in); - return InputStreamTOString(is); - } - - }

Android禁止ViewPager的左右滑动

有时候在开发中会遇到一些“诡异”的要求，比如在ViewPager中嵌入ListView，或者再嵌入一个ViewPager，那么在滑动的时候就会造成被嵌入的XXView不能滑动了，那么现在就把最外层的ViewPager禁止滑动吧，让被嵌入的XXView获得滑动事件好了。关于解决方法，网上也有很多说法，基本上是一致的，但是需要理解这个[Android](http://lib.csdn.net/base/15)下的事件分发机制才行，不明白事件分发机制的，上网查些资料看看，然后我这里也有简单的介绍，请参看博客Android自定义控件——侧滑菜单的下方。怎样禁止ViewPager左右滑动呢？大致就是重写ViewPager，覆盖ViewPager的onInterceptTouchEvent(MotionEvent arg0)方法和onTouchEvent(MotionEvent arg0)方法，这两个方法的返回值都是boolean类型的，只需要将返回值改为false，那么ViewPager就不会消耗掉手指滑动的事件了，转而传递给上层View去处理或者该事件就直接终止了。下面是我的自定义ViewPager。 ``` `public class NoScrollViewPager extends ViewPager { private boolean noScroll = false; public NoScrollViewPager(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub } public NoScrollViewPager(Context context) { super(context); } public void setNoScroll(boolean noScroll) { this.noScroll = noScroll; } @Override public void scrollTo(int x, int y) { super.scrollTo(x, y); } @Override public boolean onTouchEvent(MotionEvent arg0) { /* return false;//super.onTouchEvent(arg0); */ if (noScroll) return false; else return super.onTouchEvent(arg0); } @Override public boolean onInterceptTouchEvent(MotionEvent arg0) { if (noScroll) return false; else return super.onInterceptTouchEvent(arg0); } @Override public void setCurrentItem(int item, boolean smoothScroll) { super.setCurrentItem(item, smoothScroll); } @Override public void setCurrentItem(int item) { super.setCurrentItem(item); } }` ...

Android下如何计算要显示的字符串所占的宽度和高度

查询了google发现在android一下有几种方法可以做到，但是经过实际测试发现下面这种方法是最准确的 Rect bounds = new Rect(); String text = "Hello World"; TextPaint paint; paint = findViewById(R.id.hello_world).getPaint(); paint.getTextBounds(text, 0, text.length(), bounds); int width = bounds.width(); ``` Paint pFont = new Paint(); Rect rect = new Rect(); pFont.getTextBounds("豆", 0, 1, rect); Log.v(TAG, "height:"+rect.height()+"width:"+rect.width()); ## Android_FontMetrics对象的各种基准线(以及怎么获取文字的width和height) </div> Canvas 作为绘制文本时，使用FontMetrics对象，计算位置的坐标。 public static class FontMetrics { /** * The maximum distance above the baseline for the tallest glyph in * the font at a given text size. / public float top; /* * The recommended distance above the baseline for singled spaced text. / public float ascent; /* * The recommended distance below the baseline for singled spaced text. / public float descent; /* * The maximum distance below the baseline for the lowest glyph in * the font at a given text size. / public float bottom; /* * The recommended additional space to add between lines of text. */ public float leading; } ...

android SDK 19以上代码设置状态栏透明

//判断android 版本然后设置Systembar颜色-设置透明 public void initSystemBar() { Window window = getWindow(); //4.4版本及以上 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { window.setFlags( WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); } //5.0版本及以上 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION); window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_STABLE); window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS); window.setStatusBarColor(Color.TRANSPARENT); } }

android SDK更新镜像设置

The user guide for this mirror Powered by Tencent Bugly (bugly.qq.com) - [ANDROID SDK](http://android-mirror.bugly.qq.com:8080/include/usage.html#androidsdk) - [Android Studio](http://android-mirror.bugly.qq.com:8080/include/usage.html#ASD) <div class="tab-content"> <div id="androidsdk" class="tab active"> ☀ Windows **A. 打开Android SDK Manager** **B. 设置代理** 请务必选择: Force https://… sources to be fetched using http://… **C. 检查代理是否正常工作** 点击菜单Package>Reload，如果能获取新版本，表明可以正常访问镜像 **D. 选择包进行安装** ☀ Mac **A. Terminal下，cd到android sdk部署目录** ...

android 打Patch的方法 .

http://blog.csdn.net/sunyubo458/article/details/6680840 作为程序员，了解diff&patch命令是非常必要的。比如说我们发现某个项目有bug代码，而自己又没有svn的提交权限，那么此时最合适的解决方法就是用diff命令做一个补丁发给项目成员。项目成员通过patch命令可以立刻知道你的意图。有人会说直接传一个新文件不是更简单？不要忘了，一个patch文件尺寸更小传输更快，而且可以明显的看到都做了哪些修改。保证当前目录是demo名录： # mkdir demo # cd demo 先模拟一个项目目录old： # mkdir -p old/a/b # vi old/a/b/foo.txt old_line_1 old_line_2 假设我们发现项目old有bug代码，下面我们先拷贝一个新目录new，并在此修改bug代码： # cp -r old new # vi new/a/b/foo.txt new_line_1 new_line_2 保证old和new两个目录都在当前目录下，下面就可以使用diff命令了，不要使用绝对路径，而应该使用相对路径，至于原因，看到文章结尾你就清楚了： # LC_ALL=C TZ=UTC0 diff -Naur old new > foo.patch 如果不在意字符集，时差等问题，也可以省略LC_ALL=C TZ=UTC0环境变量： # diff -Naur old new > foo.patch 其中-Naur参数属于固定打法，不管是对一个文件，还是对一个目录，在使用这个参数基本就可以了。大概浏览一下补丁文件： # cat foo.patch diff -Naur old/a/b/foo.txt new/a/b/foo.txt — old/a/b/foo.txt 2009-12-07 20:40:07.000000000 +0800 +++ new/a/b/foo.txt 2009-12-07 20:41:51.000000000 +0800 @@ -1,2 +1,2 @@ -old_line_1 -old_line_2 +new_line_1 +new_line_2 ...

Android-HotPatch在线热补丁方案

转自：http://www.jianshu.com/p/2a7d16ab29e8 本教程采用阿里dexposed开源库实现。 https://github.com/alibaba/dexposed </blockquote> ## 主APP实现： ### 主程序Application onCreate方法中初始化dexposed ``` DexposedBridge.canDexposed(context); ### Patch apk下载及修复： - 为保证修复patch的及时性，使用push推送patch，客户端收到消息后立即完成patch的下载及修复； - 客户端版本管理模块在程序入口Activity中检测是否有需要修复的patch； - 下载完patch apk到程序私有目录，即/data/data/packageName/files目录，同时可在xml中保存patch apk本地存储路径、方便下载启动app时加载补丁patch。 ``` ` public class HotPatchManager { public static boolean canDexposed = false; private static final String SP_KEY_HOT_PATCH = "hot_patch_path"; /** * init hotPatch library. * * @param context */ public static void init(Context context) { // aop init. canDexposed = DexposedBridge.canDexposed(context); if (canDexposed) { List<String> list = getHotPatchPaths(context); if (list != null && list.size() > 0) { for (String path : list) { runPatchApk(context, path); } } } else { if (LogUtils.DEBUG) { LogUtils.d("==========your device not support dexposed aop.=========="); } } } /** * /data/data/package/files * * @param context * @param apkPath */ public static void runPatchApk(Context context, String apkPath) { if (Build.VERSION.SDK_INT >= 21 || !canDexposed) { LogUtils.d("This device doesn't support dexposed."); return; } if (!pathIsValid(context, apkPath)) { return; } try { PatchResult result = PatchMain.load(context, apkPath, null); if (result.isSuccess()) { LogUtils.d("hotPath load apk success."); } else { LogUtils.e("hotPath load apk error.", result.getErrorInfo()); result.getThrowbale().printStackTrace(); } } catch (Exception e) { e.printStackTrace(); } } /** * download hotPatch and auto mege. * * @param context */ public static void downloadHotPatch(final Context context, String downloadUrl) { if (TextUtils.isEmpty(downloadUrl)) { LogUtils.d("downloadUrl is null."); return; } DownloadInfo downloadInfo = new DownloadInfo(); downloadInfo.setDownloadUrl(downloadUrl); String fileName = downloadUrl.substring(downloadUrl.lastIndexOf("/") + 1); String fileSavePath = new File(context.getFilesDir(), fileName).getAbsolutePath(); downloadInfo.setFileSavePath(fileSavePath); downloadInfo.setDaoCallback( new Task.Callback() { @Override public void onSuccess(DownloadInfo downloadInfo) { LogUtils.d("runPatchApk begin.", downloadInfo.getFileSavePath()); runPatchApk(context, downloadInfo.getFileSavePath()); appendHotPatchPath(context, downloadInfo.getFileSavePath()); LogUtils.d("runPatchApk end.", downloadInfo.getFileSavePath()); } @Override public void onStart(DownloadInfo downloadInfo) { } @Override public void onFailure(DownloadInfo downloadInfo) { } @Override public boolean onLoading(long total, long current) { return true; } @Override public void onCancelled(DownloadInfo downloadInfo) { } } ); DownloadManager dm = DownloadService.getDownloadManager(context, DownloadService.ACTION); dm.addDownloadTask(downloadInfo); } public static void clearHotPatchFiles(Context context) { List<String> list = getHotPatchPaths(context); if (list != null && list.size() > 0) { for (String path : list) { FileUtils.delFile(path); } } } public static boolean pathIsValid(Context context, String apkPath) { if (TextUtils.isEmpty(apkPath)) { LogUtils.d("apkPath is null."); return false; } String parentDir = String.format("/data/data/%s/files", context.getPackageName()); File apkFile = new File(apkPath); if (!parentDir.equals(apkFile.getParent())) { LogUtils.d("apkPath is error.", apkPath); return false; } if (!apkFile.exists()){ LogUtils.d("apkPath is not exist.", apkPath); return false; } return true; } public static List<String> getHotPatchPaths(Context context) { List<String> list = null; SP sp = SP.getInstance(context); String paths = sp.getString(SP_KEY_HOT_PATCH, null); if (!TextUtils.isEmpty(paths)) { if (paths.indexOf(",") != -1) { String[] pathArr = paths.split(","); if (pathArr != null && pathArr.length > 0) { list = Arrays.asList(paths); } } else { list = new ArrayList<String>(); list.add(paths); } } return list; } public static void appendHotPatchPath(Context context, String apkPath) { if (!pathIsValid(context, apkPath)) { return; } SP sp = SP.getInstance(context); String paths = sp.getString(SP_KEY_HOT_PATCH, null); if (!TextUtils.isEmpty(paths)) { String allPath = new StringBuilder(apkPath).append(",").append(apkPath).toString(); sp.commit(SP_KEY_HOT_PATCH, allPath); } else { sp.commit(SP_KEY_HOT_PATCH, apkPath); } } public static void clearHotPatchPaths(Context context) { SP sp = SP.getInstance(context); sp.commit(SP_KEY_HOT_PATCH, ""); } }` ## Patch Apk部分： <blockquote> dexpose支持方法粒度的patch，可以实现整个方法的替换或方法前、后执行修复代码。以下实例为方法替换实例，其它只需实现相应的回调接口即可。 ...