Android常公用函数收集

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1：来自seal_talk

import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.res.Configuration;import android.content.res.Resources;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.net.Uri;import android.os.Environment;import android.text.TextUtils;import android.util.DisplayMetrics;import android.view.inputmethod.InputMethodManager;import java.io.IOException;import java.io.InputStream;import java.util.Locale;import java.util.Properties;/** * [公共工具类，与Android API相关的辅助类] * * @author devin.hu * @version 1.0 * @date 2013-9-30 * **/public class CommonUtils {    @SuppressWarnings("unused")    private static final String tag = CommonUtils.class.getSimpleName();    /** 网络类型 **/    public static final int NETTYPE_WIFI = 0x01;    public static final int NETTYPE_CMWAP = 0x02;    public static final int NETTYPE_CMNET = 0x03;    /**     * 根据key获取config.properties里面的值     * @param context     * @param key     * @return     */    public static String getProperty(Context context, String key) {        try {            Properties props = new Properties();            InputStream input = context.getAssets().open("config.properties");            if (input != null) {                props.load(input);                return props.getProperty(key);            }        } catch (IOException e) {            e.printStackTrace();        }        return "";    }    /**     * 检测网络是否可用     *     * @return     */    public static boolean isNetworkConnected(Context context) {        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo ni = cm.getActiveNetworkInfo();        return ni != null && ni.isConnectedOrConnecting();    }    /**     * 获取当前网络类型     *     * @return 0：没有网络 1：WIFI网络 2：WAP网络 3：NET网络     */    public static int getNetworkType(Context context) {        int netType = 0;        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();        if (networkInfo == null) {            return netType;        }        int nType = networkInfo.getType();        if (nType == ConnectivityManager.TYPE_MOBILE) {            String extraInfo = networkInfo.getExtraInfo();            if (!TextUtils.isEmpty(extraInfo)) {                if (extraInfo.toLowerCase(Locale.getDefault()).equals("cmnet")) {                    netType = NETTYPE_CMNET;                } else {                    netType = NETTYPE_CMWAP;                }            }        } else if (nType == ConnectivityManager.TYPE_WIFI) {            netType = NETTYPE_WIFI;        }        return netType;    }    /**     * 判断SDCard是否存在,并可写     *     * @return     */    public static boolean checkSDCard() {        String flag = Environment.getExternalStorageState();        return Environment.MEDIA_MOUNTED.equals(flag);    }    /**     * 获取屏幕宽度     * @param context     * @return     */    public static int getScreenWidth(Context context) {        DisplayMetrics dm = context.getResources().getDisplayMetrics();        return dm.widthPixels;    }    /**     * 获取屏幕高度     * @param context     * @return     */    public static int getScreenHeight(Context context) {        DisplayMetrics dm = context.getResources().getDisplayMetrics();        return dm.heightPixels;    }    /**     * 获取屏幕显示信息对象     * @param context     * @return     */    public static DisplayMetrics getDisplayMetrics(Context context) {        DisplayMetrics dm = context.getResources().getDisplayMetrics();        return dm;    }    /**     * dp转pixel     */    public static float dpToPixel(float dp, Context context) {        Resources resources = context.getResources();        DisplayMetrics metrics = resources.getDisplayMetrics();        return dp * (metrics.densityDpi / 160f);    }    /**     * pixel转dp     */    public static float pixelsToDp(float px, Context context) {        Resources resources = context.getResources();        DisplayMetrics metrics = resources.getDisplayMetrics();        return px / (metrics.densityDpi / 160f);    }    /**     * 生成二维码图片     * @param str     * @return     *///  public static Bitmap create2DCode(String str) {//      try {//          // 生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败//          BitMatrix matrix = new MultiFormatWriter().encode(str, BarcodeFormat.QR_CODE, 300, 300);//          int width = matrix.getWidth();//          int height = matrix.getHeight();////          // 二维矩阵转为一维像素数组,也就是一直横着排了//          int[] pixels = new int[width * height];//          for (int y = 0; y < height; y++) {//              for (int x = 0; x < width; x++) {//                  if (matrix.get(x, y)) {//                      pixels[y * width + x] = 0xff000000;//                  }//              }//          }////          Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);//          // 通过像素数组生成bitmap,具体参考api//          bitmap.setPixels(pixels, 0, width, 0, 0, width, height);//          return bitmap;//      } catch (WriterException e) {//          e.printStackTrace();//      }//      return null;//  }    /**     * 短信分享     *     * @param mContext     * @param smstext 短信分享内容     * @return     */    public static Boolean sendSms(Context mContext, String smstext) {        Uri smsToUri = Uri.parse("smsto:");        Intent mIntent = new Intent(Intent.ACTION_SENDTO, smsToUri);        mIntent.putExtra("sms_body", smstext);        mContext.startActivity(mIntent);        return null;    }    /**     * 邮件分享     *     * @param mContext     * @param title 邮件的标题     * @param text 邮件的内容     * @return     */    public static void sendMail(Context mContext, String title, String text) {        // 调用系统发邮件        Intent emailIntent = new Intent(Intent.ACTION_SEND);        // 设置文本格式        emailIntent.setType("text/plain");        // 设置对方邮件地址        emailIntent.putExtra(Intent.EXTRA_EMAIL, "");        // 设置标题内容        emailIntent.putExtra(Intent.EXTRA_SUBJECT, title);        // 设置邮件文本内容        emailIntent.putExtra(Intent.EXTRA_TEXT, text);        mContext.startActivity(Intent.createChooser(emailIntent, "Choose Email Client"));    }    /**     * 隐藏软键盘     * @param activity     */    public static void hideKeyboard(Activity activity) {        if (activity != null) {            InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);            if (imm.isActive()) {                imm.hideSoftInputFromWindow(activity.getCurrentFocus().getWindowToken(), 0);            }        }    }    /**     * 显示软键盘     * @param activity     */    public static void showKeyboard(Activity activity) {        if (activity != null) {            InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);            if (!imm.isActive()) {                imm.showSoftInputFromInputMethod(activity.getCurrentFocus().getWindowToken(), 0);            }        }    }    /**     * 是否横屏     * @param context     * @return true为横屏，false为竖屏     */    public static boolean isLandscape(Context context) {        return context.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE;    }    /**     * 判断是否是平板     * 这个方法是从 Google I/O App for Android 的源码里找来的，非常准确。     * @param context     * @return     */    public static boolean isTablet(Context context) {        return (context.getResources().getConfiguration().screenLayout                & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_LARGE;    }}

2 Bitmap常用函数

import android.graphics.Bitmapimport android.graphics.Canvasimport android.graphics.PixelFormatimport android.graphics.drawable.Drawable/** * Created by XiaoJun on 2017/8/20. * Version 1.0.0 */object BitmapUtils {    //将drawable转换成bitmap    fun drawableToBitmap(drawable: Drawable): Bitmap {        val w = drawable.intrinsicWidth        val h = drawable.intrinsicHeight        val config = if (drawable.opacity != PixelFormat.OPAQUE)            Bitmap.Config.ARGB_8888        else            Bitmap.Config.RGB_565        val bitmap = Bitmap.createBitmap(w, h, config)        //注意，下面三行代码要用到，否则在View或者SurfaceView里的canvas.drawBitmap会看不到图        val canvas = Canvas(bitmap)        drawable.setBounds(0, 0, w, h)        drawable.draw(canvas)        return bitmap    }    /**     * 裁剪     * @param bitmap 原图     * *     * @return 裁剪后的图像     */    fun cropBitmap(bitmap: Bitmap, aimWidth:Int, aimHeight:Int): Bitmap {        var toWidth = aimWidth;        var toHeight = aimHeight        if (aimWidth > bitmap.width) toWidth = bitmap.width        if (aimHeight > bitmap.height) toHeight = bitmap.height        val cropWidthSide = (bitmap.width - aimWidth)/2        val cropHeightSide = (bitmap.height - aimHeight)/2        return Bitmap.createBitmap(bitmap,cropWidthSide,cropHeightSide,toWidth,toHeight)    }}

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