Android实用代码大全
1、 精确获取屏幕尺寸（例如：3.5、4.0、5.0寸屏幕）
public static double getScreenPhysicalSize(Activity ctx) { DisplayMetrics dm = new DisplayMetrics(); ctx.getWindowManager().getDefaultDisplay().getMetrics(dm); double diagonalPixels = Math.sqrt(Math.pow(dm.widthPixels, 2) + Math.pow(dm.heightPixels, 2)); return diagonalPixels / (160 * dm.density); }
2、 判断是否是平板（官方用法）
public static boolean isTablet(Context context) { return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_LARGE;
public static float GetTextWidth(String text, float Size) { TextPaint FontPaint = new TextPaint(); FontPaint.setTextSize(Size); return FontPaint.measureText(text); }
}
3、 文字根据状态更改颜色 android:textColor
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#53c1bd" android:state_selected="true"/>
<item android:color="#53c1bd" android:state_focused="true"/>
<item android:color="#53c1bd" android:state_pressed="true"/>
<item android:color="#777777"/>
</selector>
4、背景色根据状态更改颜色 android:backgroup
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true">
<shape>
<gradient
android:angle="0"
android:centerColor="#00a59f"
android:endColor="#00a59f"
android:startColor="#00a59f" />
</shape>
</item>
<item android:state_focused="true">
<shape>
<gradient
android:angle="0"
android:centerColor="#00a59f"
android:endColor="#00a59f"
android:startColor="#00a59f" />
</shape>
</item>
<item android:state_pressed="true">
<shape>
<gradient
android:angle="0"
android:centerColor="#00a59f"
android:endColor="#00a59f"
android:startColor="#00a59f" />
</shape>
</item>
<item>
<shape>
<gradient
android:angle="0"
android:centerColor="#00ff00"
android:endColor="00ff00"
android:startColor="00ff00" />
</shape>
</item>
</selector>
5、 启动APK的默认Activity
public static void startApkActivity(final Context ctx, String packageName) { PackageManager pm = ctx.getPackageManager(); PackageInfo pi; try { pi = pm.getPackageInfo(packageName, 0); Intent intent = new Intent(Intent.ACTION_MAIN, null); intent.addCategory(Intent.CATEGORY_LAUNCHER); intent.setPackage(pi.packageName);List<ResolveInfo> apps = pm.queryIntentActivities(intent, 0); ResolveInfo ri = apps.iterator().next(); if (ri != null) { String className = ri.activityInfo.name; intent.setComponent(new ComponentName(packageName, className)); ctx.startActivity(intent); } } catch (NameNotFoundException e) { Log.e("startActivity", e); } }
6、计算字宽
public static float GetTextWidth(String text, float Size) { TextPaint FontPaint = new TextPaint(); FontPaint.setTextSize(Size); return FontPaint.measureText(text); }
7、获取应用程序下所有Activity
public static ArrayList<String> getActivities(Context ctx) { ArrayList<String> result = new ArrayList<String>(); Intent intent = new Intent(Intent.ACTION_MAIN, null); intent.setPackage(ctx.getPackageName()); for (ResolveInfo info : ctx.getPackageManager().queryIntentActivities(intent, 0)) { result.add(info.activityInfo.name); } return result; }
8、检测字符串中是否包含汉字
public static boolean checkChinese(String sequence) { final String format = "[\\u4E00-\\u9FA5\\uF900-\\uFA2D]"; boolean result = false; Pattern pattern = Pattern.compile(format); Matcher matcher = pattern.matcher(sequence); result = matcher.find(); return result; }
9、检测字符串中只能包含：中文、数字、下划线(_)、横线(-)
public static boolean checkNickname(String sequence) { final String format = "[^\\u4E00-\\u9FA5\\uF900-\\uFA2D\\w-_]"; Pattern pattern = Pattern.compile(format); Matcher matcher = pattern.matcher(sequence); return !matcher.find(); }
10、检查有没有应用程序来接受处理你发出的intent
public static boolean isIntentAvailable(Context context, String action) { final PackageManager packageManager = context.getPackageManager(); final Intent intent = new Intent(action); List<ResolveInfo> list = packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY); return list.size(); }
11、使用TransitionDrawable实现图片显示的时候有渐变效果
private void setImageBitmap(ImageView imageView, Bitmap bitmap) { // Use TransitionDrawable to fade in. final TransitionDrawable td = new TransitionDrawable(new Drawable[] { new ColorDrawable(android.R.color.transparent), new BitmapDrawable(mContext.getResources(), bitmap) }); //noinspection deprecation imageView.setBackgroundDrawable(imageView.getDrawable()); imageView.setImageDrawable(td); td.startTransition(200); }
12、 扫描指定的文件
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
用途：从本软件新增、修改、删除图片、文件某一个文件（音频、视频）需要更新系统媒体库时使用，不必扫描整个SD卡。
13、Dip转px
public static int dipToPX(final Context ctx, float dip) { return (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, ctx.getResources().getDisplayMetrics()); }
14、获取已经安装APK（列表）的路径
PackageManager pm = getPackageManager(); for (ApplicationInfo app : pm.getInstalledApplications(0)) { Log.d("PackageList", "package: " + app.packageName + ", sourceDir: " + app.sourceDir); }
15、 多进程Preferences数据共享
public static void putStringProcess(Context ctx, String key, String value) { SharedPreferences sharedPreferences = ctx.getSharedPreferences("preference_mu", Context.MODE_MULTI_PROCESS); Editor editor = sharedPreferences.edit(); editor.putString(key, value); editor.commit(); } public static String getStringProcess(Context ctx, String key, String defValue) { SharedPreferences sharedPreferences = ctx.getSharedPreferences("preference_mu", Context.MODE_MULTI_PROCESS); return sharedPreferences.getString(key, defValue); }
16、泛型ArrayList转数组
@SuppressWarnings("unchecked")
public static <T> T[] toArray(Class<?> cls, ArrayList<T> items) {
if (items == null || items.size() == 0) {
return (T[]) Array.newInstance(cls, 0);
}
return items.toArray((T[]) Array.newInstance(cls, items.size()));
}
17、 保存恢复ListView当前位置
private void saveCurrentPosition() { if (mListView != null) { int position = mListView.getFirstVisiblePosition(); View v = mListView.getChildAt(0); int top = (v == null) ? 0 : v.getTop(); //保存position和top } } private void restorePosition() { if (mFolder != null && mListView != null) { int position = 0;//取出保存的数据 int top = 0;//取出保存的数据 mListView.setSelectionFromTop(position, top); } }
18、调用 便携式热点和数据共享 设置
public static Intent getHotspotSetting() { Intent intent = new Intent(); intent.setAction(Intent.ACTION_MAIN); ComponentName com = new ComponentName("com.android.settings", "com.android.settings.TetherSettings"); intent.setComponent(com); return intent; }
19、 格式化输出IP地址
public static String getIp(Context ctx) { return Formatter.formatIpAddress((WifiManager) ctx.getSystemService(Context.WIFI_SERVICE).getConnectionInfo().getIpAddress()); }
20、 ip地址转成8位十六进制串
/** ip转16进制 */ public static String ipToHex(String ips) { StringBuffer result = new StringBuffer(); if (ips != null) { StringTokenizer st = new StringTokenizer(ips, "."); while (st.hasMoreTokens()) { String token = Integer.toHexString(Integer.parseInt(st.nextToken())); if (token.length() == 1) token = "0" + token; result.append(token); } } return result.toString(); } /** 16进制转ip */ public static String texToIp(String ips) { try { StringBuffer result = new StringBuffer(); if (ips != null && ips.length() == 8) { for (int i = 0; i < 8; i += 2) { if (i != 0) result.append('.'); result.append(Integer.parseInt(ips.substring(i, i + 2), 16)); } } return result.toString(); } catch (NumberFormatException ex) { Logger.e(ex); } return ""; } ip:192.168.68.128 16 =>hex :c0a84480
21、 文件夹排序（先文件夹排序，后文件排序）
public static void sortFiles(File[] files) { Arrays.sort(files, new Comparator<File>() { @Override public int compare(File lhs, File rhs) { //返回负数表示o1 小于o2，返回0 表示o1和o2相等，返回正数表示o1大于o2。 boolean l1 = lhs.isDirectory(); boolean l2 = rhs.isDirectory(); if (l1 && !l2) return -1; else if (!l1 && l2) return 1; else { return lhs.getName().compareTo(rhs.getName()); } } }); }
22、代码设置TextView的样式
使用过自定义Dialog可能马上会想到用如下代码：
new TextView(this,null,R.style.text_style);
但你运行这代码你会发现毫无作用！正确用法：
new TextView(new ContextThemeWrapper(this, R.style.text_style))
23、获取网络类型名称
public static String getNetworkTypeName(Context context) { if (context != null) { ConnectivityManager connectMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connectMgr != null) { NetworkInfo info = connectMgr.getActiveNetworkInfo(); if (info != null) { switch (info.getType()) { case ConnectivityManager.TYPE_WIFI: return "WIFI"; case ConnectivityManager.TYPE_MOBILE: return getNetworkTypeName(info.getSubtype()); } } } } return getNetworkTypeName(TelephonyManager.NETWORK_TYPE_UNKNOWN); } public static String getNetworkTypeName(int type) { switch (type) { case TelephonyManager.NETWORK_TYPE_GPRS: return "GPRS"; case TelephonyManager.NETWORK_TYPE_EDGE: return "EDGE"; case TelephonyManager.NETWORK_TYPE_UMTS: return "UMTS"; case TelephonyManager.NETWORK_TYPE_HSDPA: return "HSDPA"; case TelephonyManager.NETWORK_TYPE_HSUPA: return "HSUPA"; case TelephonyManager.NETWORK_TYPE_HSPA: return "HSPA"; case TelephonyManager.NETWORK_TYPE_CDMA: return "CDMA"; case TelephonyManager.NETWORK_TYPE_EVDO_0: return "CDMA - EvDo rev. 0"; case TelephonyManager.NETWORK_TYPE_EVDO_A: return "CDMA - EvDo rev. A"; case TelephonyManager.NETWORK_TYPE_EVDO_B: return "CDMA - EvDo rev. B"; case TelephonyManager.NETWORK_TYPE_1xRTT: return "CDMA - 1xRTT"; case TelephonyManager.NETWORK_TYPE_LTE: return "LTE"; case TelephonyManager.NETWORK_TYPE_EHRPD: return "CDMA - eHRPD"; case TelephonyManager.NETWORK_TYPE_IDEN: return "iDEN"; case TelephonyManager.NETWORK_TYPE_HSPAP: return "HSPA+"; default: return "UNKNOWN"; } }
24、Android解压Zip包
/** * 解压一个压缩文档 到指定位置 * * @param zipFileString 压缩包的名字 * @param outPathString 指定的路径 * @throws Exception */ public static void UnZipFolder(String zipFileString, String outPathString) throws Exception { java.util.zip.ZipInputStream inZip = new java.util.zip.ZipInputStream(new java.io.FileInputStream(zipFileString)); java.util.zip.ZipEntry zipEntry; String szName = "";while ((zipEntry = inZip.getNextEntry()) != null) { szName = zipEntry.getName(); if (zipEntry.isDirectory()) { // get the folder name of the widget szName = szName.substring(0, szName.length() - 1); java.io.File folder = new java.io.File(outPathString + java.io.File.separator + szName); folder.mkdirs(); } else { java.io.File file = new java.io.File(outPathString + java.io.File.separator + szName); file.createNewFile(); // get the output stream of the file java.io.FileOutputStream out = new java.io.FileOutputStream(file); int len; byte[] buffer = new byte[1024]; // read (len) bytes into buffer while ((len = inZip.read(buffer)) != -1) { // write (len) byte from buffer at the position 0 out.write(buffer, 0, len); out.flush(); } out.close(); } }//end of while inZip.close(); }//end of func
25、 从assets中读取文本和图片资源
/** 从assets 文件夹中读取文本数据 */ public static String getTextFromAssets(final Context context, String fileName) { String result = ""; try { InputStream in = context.getResources().getAssets().open(fileName); // 获取文件的字节数 int lenght = in.available(); // 创建byte数组 byte[] buffer = new byte[lenght]; // 将文件中的数据读到byte数组中 in.read(buffer); result = EncodingUtils.getString(buffer, "UTF-8"); in.close(); } catch (Exception e) { e.printStackTrace(); } return result; } /** 从assets 文件夹中读取图片 */ public static Drawable loadImageFromAsserts(final Context ctx, String fileName) { try { InputStream is = ctx.getResources().getAssets().open(fileName); return Drawable.createFromStream(is, null); } catch (IOException e) { if (e != null) { e.printStackTrace(); } } catch (OutOfMemoryError e) { if (e != null) { e.printStackTrace(); } } catch (Exception e) { if (e != null) { e.printStackTrace(); } } return null; }
26、展开、收起状态栏
public static final void collapseStatusBar(Context ctx) { Object sbservice = ctx.getSystemService("statusbar"); try { Class<?> statusBarManager = Class.forName("android.app.StatusBarManager"); Method collapse; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) { collapse = statusBarManager.getMethod("collapsePanels"); } else { collapse = statusBarManager.getMethod("collapse"); } collapse.invoke(sbservice); } catch (Exception e) { e.printStackTrace(); } } public static final void expandStatusBar(Context ctx) { Object sbservice = ctx.getSystemService("statusbar"); try { Class<?> statusBarManager = Class.forName("android.app.StatusBarManager"); Method expand; if (Build.VERSION.SDK_INT >= 17) { expand = statusBarManager.getMethod("expandNotificationsPanel"); } else { expand = statusBarManager.getMethod("expand"); } expand.invoke(sbservice); } catch (Exception e) { e.printStackTrace(); } }
27、 获取状态栏高度
public static int getStatusBarHeight(Context context){ Class<?> c = null; Object obj = null; Field field = null; int x = 0, statusBarHeight = 0; try { c = Class.forName("com.android.internal.R$dimen"); obj = c.newInstance(); field = c.getField("status_bar_height"); x = Integer.parseInt(field.get(obj).toString()); statusBarHeight = context.getResources().getDimensionPixelSize(x); } catch (Exception e1) { e1.printStackTrace(); } return statusBarHeight; }
28、ListView使用ViewHolder极简写法
public static <T extends View> T getAdapterView(View convertView, int id) { SparseArray<View> viewHolder = (SparseArray<View>) convertView.getTag(); if (viewHolder == null) { viewHolder = new SparseArray<View>(); convertView.setTag(viewHolder); } View childView = viewHolder.get(id); if (childView == null) { childView = convertView.findViewById(id); viewHolder.put(id, childView); } return (T) childView; }
用法：
@Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_feed_item, parent, false); } ImageView thumnailView = getAdapterView(convertView, R.id.video_thumbnail); ImageView avatarView = getAdapterView(convertView, R.id.user_avatar); ImageView appIconView = getAdapterView(convertView, R.id.app_icon); }
29、 设置Activity透明
<style name="TransparentActivity" parent="AppBaseTheme">
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:colorBackgroundCacheHint">@null</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowContentOverlay">@null</item>
</style>
说明：AppBaseTheme一般是你application指定的android:theme是啥这里就是啥，否则Activity内部的空间风格可能不一致。
用途：用于模拟Dialog效果，比如再Service中没法用Dialog，就可以用Activity来模拟
30、 代码切换全屏
//切换到全屏 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN); getActivity().getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);//切换到非全屏 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); getWindow().addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);