Android一个页码的导航条

package com.sjjd.hu.utils; import android.content.Context; import android.content.SharedPreferences; import android.graphics.Bitmap; import android.graphics.Bitmap.CompressFormat; import android.graphics.BitmapFactory; import android.os.Environment; import android.preference.PreferenceManager; import android.text.TextUtils; import android.util.Log; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.Map; public class TinyDB { private SharedPreferences preferences; private String DEFAULT_APP_IMAGEDATA_DIRECTORY; private String lastImagePath = ""; public TinyDB(Context appContext) { preferences = PreferenceManager.getDefaultSharedPreferences(appContext); } /** * Decodes the Bitmap from 'path' and returns it * * @param path image path * @return the Bitmap from 'path' */ public Bitmap getImage(String path) { Bitmap bitmapFromPath = null; try { bitmapFromPath = BitmapFactory.decodeFile(path); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } return bitmapFromPath; } /** * Returns the String path of the last saved image * * @return string path of the last saved image */ public String getSavedImagePath() { return lastImagePath; } /** * Saves 'theBitmap' into folder 'theFolder' with the name 'theImageName' * * @param theFolder the folder path dir you want to save it to e.g "DropBox/WorkImages" * @param theImageName the name you want to assign to the image file e.g "MeAtLunch.png" * @param theBitmap the image you want to save as a Bitmap * @return returns the full path(file system address) of the saved image */ public String putImage(String theFolder, String theImageName, Bitmap theBitmap) { if (theFolder == null || theImageName == null || theBitmap == null) return null; this.DEFAULT_APP_IMAGEDATA_DIRECTORY = theFolder; String mFullPath = setupFullPath(theImageName); if (!mFullPath.equals("")) { lastImagePath = mFullPath; saveBitmap(mFullPath, theBitmap); } return mFullPath; } /** * Saves 'theBitmap' into 'fullPath' * * @param fullPath full path of the image file e.g. "Images/MeAtLunch.png" * @param theBitmap the image you want to save as a Bitmap * @return true if image was saved, false otherwise */ public boolean putImageWithFullPath(String fullPath, Bitmap theBitmap) { return !(fullPath == null || theBitmap == null) && saveBitmap(fullPath, theBitmap); } /** * Creates the path for the image with name 'imageName' in DEFAULT_APP.. directory * * @param imageName name of the image * @return the full path of the image. If it failed to create directory, return empty string */ private String setupFullPath(String imageName) { File mFolder = new File(Environment.getExternalStorageDirectory(), DEFAULT_APP_IMAGEDATA_DIRECTORY); if (isExternalStorageReadable() && isExternalStorageWritable() && !mFolder.exists()) { if (!mFolder.mkdirs()) { Log.e("ERROR", "Failed to setup folder"); return ""; } } return mFolder.getPath() + '/' + imageName; } /** * Saves the Bitmap as a PNG file at path 'fullPath' * * @param fullPath path of the image file * @param bitmap the image as a Bitmap * @return true if it successfully saved, false otherwise */ private boolean saveBitmap(String fullPath, Bitmap bitmap) { if (fullPath == null || bitmap == null) return false; boolean fileCreated = false; boolean bitmapCompressed = false; boolean streamClosed = false; File imageFile = new File(fullPath); if (imageFile.exists()) if (!imageFile.delete()) return false; try { fileCreated = imageFile.createNewFile(); } catch (IOException e) { e.printStackTrace(); } FileOutputStream out = null; try { out = new FileOutputStream(imageFile); bitmapCompressed = bitmap.compress(CompressFormat.PNG, 100, out); } catch (Exception e) { e.printStackTrace(); bitmapCompressed = false; } finally { if (out != null) { try { out.flush(); out.close(); streamClosed = true; } catch (IOException e) { e.printStackTrace(); streamClosed = false; } } } return (fileCreated && bitmapCompressed && streamClosed); } // Getters /** * Get int value from SharedPreferences at 'key'. If key not found, return 'defaultValue' * * @param key SharedPreferences key * @param defaultValue int value returned if key was not found * @return int value at 'key' or 'defaultValue' if key not found */ public int getInt(String key) { return preferences.getInt(key, 0); } /** * Get parsed ArrayList of Integers from SharedPreferences at 'key' * * @param key SharedPreferences key * @return ArrayList of Integers */ public ArrayList<Integer> getListInt(String key) { String[] myList = TextUtils.split(preferences.getString(key, ""), "‚‗‚"); ArrayList<String> arrayToList = new ArrayList<String>(Arrays.asList(myList)); ArrayList<Integer> newList = new ArrayList<Integer>(); for (String item : arrayToList) newList.add(Integer.parseInt(item)); return newList; } /** * Get long value from SharedPreferences at 'key'. If key not found, return 'defaultValue' * * @param key SharedPreferences key * @param defaultValue long value returned if key was not found * @return long value at 'key' or 'defaultValue' if key not found */ public long getLong(String key, long defaultValue) { return preferences.getLong(key, defaultValue); } /** * Get float value from SharedPreferences at 'key'. If key not found, return 'defaultValue' * * @param key SharedPreferences key * @param defaultValue float value returned if key was not found * @return float value at 'key' or 'defaultValue' if key not found */ public float getFloat(String key) { return preferences.getFloat(key, 0); } /** * Get double value from SharedPreferences at 'key'. If exception thrown, return 'defaultValue' * * @param key SharedPreferences key * @param defaultValue double value returned if exception is thrown * @return double value at 'key' or 'defaultValue' if exception is thrown */ public double getDouble(String key, double defaultValue) { String number = getString(key); try { return Double.parseDouble(number); } catch (NumberFormatException e) { return defaultValue; } } /** * Get parsed ArrayList of Double from SharedPreferences at 'key' * * @param key SharedPreferences key * @return ArrayList of Double */ public ArrayList<Double> getListDouble(String key) { String[] myList = TextUtils.split(preferences.getString(key, ""), "‚‗‚"); ArrayList<String> arrayToList = new ArrayList<String>(Arrays.asList(myList)); ArrayList<Double> newList = new ArrayList<Double>(); for (String item : arrayToList) newList.add(Double.parseDouble(item)); return newList; } /** * Get