1、根據手機的分辨率從 dp 的單位 轉成爲 px(像素)
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
2、根據手機的分辨率從 px(像素) 的單位 轉成爲 dp
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
3、獲取屏幕的寬度
public static int getScreenWidth(Context context) {
DisplayMetrics dm = new DisplayMetrics();
dm = context.getApplicationContext().getResources().getDisplayMetrics();
int width = dm.widthPixels;
return width;
}
public static int getScreenHeight(Context context) {
DisplayMetrics dm = new DisplayMetrics();
dm = context.getApplicationContext().getResources().getDisplayMetrics();
int height = dm.heightPixels;
return height;
}
public static boolean isMobileNO(String mobiles) {
Pattern p = Pattern.compile("^[1][3,4,5,8,7][0-9]{9}$");
Matcher m = p.matcher(mobiles);
return m.matches();
}
6、驗證郵箱格式正確性，僅驗證郵箱是否是字母或數字組成、以及@符號後是否爲字母或數字
public static boolean checkEmail(String arg0) {
return arg0.matches("^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$");
}
7、用戶名，由字母數字下劃線組成，並以字母下劃線開頭，6到20個字符之間
public boolean checkUserName(String name){
Pattern pattern = Pattern.compile("^^[a-zA-Z_][a-zA-Z0-9_]{5,19}$");
Matcher matcher = pattern.matcher(name);
return matcher.matches();
}
public static String getSex(String arg0) {
if(checkNullMethod(arg0) && arg0.length() >= 18){
String sex = arg0.substring(16, 17);
int sex2 = Integer.valueOf(sex);
if (sex2 % 2 == 0) {
return "女";
}
}else{
return "男";
}
return "";
}
public static String getBirth(String arg0) {
String year = arg0.substring(6, 10);
String month = arg0.substring(10, 12);
String day = arg0.substring(12, 14);
return year + "-" + month + "-" + day;
}
public static String getAge(String arg0) {
String year = arg0.substring(6, 10);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy");
String nowYear = sdf.format(System.currentTimeMillis());
int age = Integer.valueOf(nowYear) - Integer.valueOf(year);
return age + "";
}
public static boolean checkNullMethod(String arg0) {
if(arg0 == null)
return false;
arg0 = arg0.trim();
if (arg0 != null && arg0.length() != 0 && !arg0.equals("null") && !arg0.equals("")) {
return true;
}
return false;
}
public Bitmap decodeUriAsBitmap(Uri uri) {
Bitmap bitmap = null;
try {
bitmap = BitmapFactory.decodeStream(context.getContentResolver()
.openInputStream(uri));
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}
return bitmap;
}
public static void setListheight(ListView listview) {
ListAdapter listadapter = listview.getAdapter();
if (listadapter == null) {
return;
}
int totalheight = 0;
for (int i = 0; i < listadapter.getCount(); i++) {
View listItem = listadapter.getView(i, null, listview);
listItem.measure(0, 0);
totalheight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listview.getLayoutParams();
params.height = totalheight+ (listview.getDividerHeight() * (listadapter.getCount() - 1));
listview.setLayoutParams(params);
}
14、獲取應用版本名稱，此處是versionName
public String getVersionName() {
String versionName = "v1.0";
try {
PackageManager pm = context.getPackageManager();
PackageInfo pi = pm.getPackageInfo(context.getPackageName(), 0);
versionName = pi.versionName;
} catch (NameNotFoundException e) {
e.printStackTrace();
}
return versionName;
}
15、獲取應用版本號，此處是versionCode
public int getVersionCode() {
try {
PackageManager pm = context.getPackageManager();
PackageInfo pi = pm.getPackageInfo(context.getPackageName(), 0);
return pi.versionCode;
} catch (NameNotFoundException e) {
e.printStackTrace();
}
return 0;
}
public void closeInput(EditText ed_text) {
InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
// 得到InputMethodManager的實例
if (imm.isActive()) {
imm.hideSoftInputFromWindow(ed_text.getWindowToken(),InputMethodManager.HIDE_NOT_ALWAYS);
}
}
17、根據uri獲取路徑，如果是uri路徑則通過uri返回文件絕對路徑
public String getUriPath(Uri fileUri) {
Uri filePathUri = fileUri;
if (fileUri != null) {
/** content:// 開頭的uri*/
if (fileUri.getScheme().toString().compareTo("content") == 0) {
// 通過uri獲取選中的圖片文件路徑
String[] proj = { MediaStore.Images.Media.DATA };
@SuppressWarnings("deprecation")
Cursor cursor = ((Activity) context).managedQuery(fileUri,proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
// 最後根據索引值獲取圖片路徑
String path = cursor.getString(column_index);
return path;
}
/** file:// 開頭的uri*/
else if (fileUri.getScheme().compareTo("file") == 0) {
String fileName = filePathUri.toString();
fileName = filePathUri.toString().replace("file://", "");
return fileName;
}
}
return null;
}
18、檢測屏幕是否是鎖屏狀態；爲true，表示有兩種狀態：a、屏幕是黑的 b、目前正處於解鎖狀態 。爲false，表示目前未鎖屏
public boolean getIsLockScreen(){
KeyguardManager mKeyguardManager = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
return mKeyguardManager.inKeyguardRestrictedInputMode();
}
public static String longToString(long currentTime, String formatType) throws ParseException {
Date date = longToDate(currentTime, formatType); // long類型轉成Date類型
String strTime = dateToString(date, formatType); // date類型轉成String
return strTime;
}
20、日期轉換；string類型轉換爲long類型
public static long stringToLong(String strTime, String formatType) throws ParseException {
Date date = stringToDate(strTime, formatType); // String類型轉成date類型
if (date == null) {
return 0;
} else {
long currentTime = dateToLong(date); // date類型轉成long類型
return currentTime;
}
}
public static long dateToLong(Date date) {
return date.getTime();
}
public static Date longToDate(long currentTime, String formatType) throws ParseException {
Date dateOld = new Date(currentTime); // 根據long類型的毫秒數生命一個date類型的時間
String sDateTime = dateToString(dateOld, formatType); // 把date類型的時間轉換爲string
Date date = stringToDate(sDateTime, formatType); // 把String類型轉換爲Date類型
return date;
}
public static Date stringToDate(String strTime, String formatType) throws ParseException {
SimpleDateFormat formatter = new SimpleDateFormat(formatType);
Date date = null;
try {
date = formatter.parse(strTime);
} catch (java.text.ParseException e) {
e.printStackTrace();
}
return date;
}
24、date類型轉換爲String類型； formatType格式爲 yyyy-MM-dd HH:mm:ss（yyyy年MM月dd日 HH時mm分ss秒）； data爲Date類型的時間
public static String dateToString(Date data, String formatType) {
return new SimpleDateFormat(formatType).format(data);
}
public static void hideVirtualButtons(Activity activity) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE);
}
}
public static long getAvailableMemory(Context context) {
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();
am.getMemoryInfo(memoryInfo);
return memoryInfo.availMem;
}
public static boolean isAppOnForeground(Context context) {
ActivityManager activityManager = (ActivityManager) context.getApplicationContext()
.getSystemService(Context.ACTIVITY_SERVICE);
String packageName = context.getApplicationContext().getPackageName();
List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
if (appProcesses == null)
return false;
for (RunningAppProcessInfo appProcess : appProcesses) {
if (appProcess.processName.equals(packageName)
&& appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
return true;
}
}
return false;
}
public static boolean hasSdcard() {
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
return true;
}
return false;
}
public static void copyfile(File fromFile, File toFile){
if(toFile.exists()){
toFile.delete();
}
FileInputStream fosform;
try {
fosform = new FileInputStream(fromFile);
FileOutputStream fosto = new FileOutputStream(toFile);
byte b[] = new byte[1024];
int len;
while((len = fosform.read(b)) > 0){
fosto.write(b,0,len);
}
fosform.close();
fosto.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static String getFormetFileSize(){
long fileS = getCacheSize();
DecimalFormat df = new DecimalFormat("#0.00");
String fileSizeString = "";
if (fileS < 1024){
fileSizeString = df.format((double) fileS) + "B";
}else if (fileS < 1048576){
fileSizeString = df.format((double) fileS / 1024) + "K";
}else if (fileS < 1073741824){
fileSizeString = df.format((double) fileS / 1048576) + "M";
}else{
fileSizeString = df.format((double) fileS / 1073741824) + "G";
}
return fileSizeString;
}
public void saveDatasInFile(String xmlString, String fileName) {
FileOutputStream fos = null;
try{
fos = context.openFileOutput(fileName, Context.MODE_PRIVATE);
fos.write(xmlString.getBytes());
fos.flush();
}catch(Exception e){
e.printStackTrace();
}finally{
try {
fos.close();
} catch (Exception e) {}
}
}
public void readDatasInFile(final String fileName,final readFileCallback callback){
try {
FileInputStream fin = context.openFileInput(fileName);
//獲取文件長度
int lenght = fin.available();
byte[] buffer = new byte[lenght];
fin.read(buffer);
//將byte數組轉換成指定格式的字符串
String result = new String(buffer,"utf-8");
callback.readFile(result);
} catch (Exception e) {
e.printStackTrace();
}
}
public interface readFileCallback{
public void readFile(String string);
}
33、獲取視頻封面
public static String getVideoThumbPath(Context context, String path) {
String thumbPath = null;
Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(path, MediaStore.Video.Thumbnails.FULL_SCREEN_KIND);
File file = SDUtils.getCreatFile(context, SDUtils.imgCachePicUrl, System.currentTimeMillis() + ".jpg");
FileOutputStream fOut = null;
try {
fOut = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
fOut.flush();
fOut.close();
} catch (IOException e) {
return null;
}
thumbPath = file.getAbsolutePath();
return thumbPath;
}
34、okhttp3打印請求參數（表單提交方式）
private static String bodyToString(final Request request){
try {
final Request copy = request.newBuilder().build();
final Buffer buffer = new Buffer();
copy.body().writeTo(buffer);
String s = buffer.readUtf8();
return URLDecoder.decode(s, "UTF-8");
} catch (final IOException e) {
return "did not work";
}
