How to use standard preference settings in a surface view class in Android

Question

I am implementing one game application in this application. I use general settings in Activity settings

spinnerTheme.setOnItemSelectedListener(new OnItemSelectedListener(){ SharedPreferences prefs1 = getSharedPreferences("TipCalcPreferenceDatabase", 0); Editor e = prefs1.edit(); public void onItemSelected(AdapterView parent,View v,int position,long id) { prefs = getSharedPreferences("TipCalcPreferenceDatabase", 0); Editor e = prefs.edit(); String str; if(position==0) { str= String.valueOf((R.drawable.image1)); e.putString("TipCalcPropertyName", str); } if(position==1) { str= String.valueOf((R.drawable.image2)); e.putString("TipCalcPropertyName", str); } else if(position==2) { str= String.valueOf((R.drawable.ballon_background)); e.putString("TipCalcPropertyName", str); } e.commit(); /* Preferences current Theme update START*/ String mySetting = prefs.getString("TipCalcPropertyName", ""); LinearLayout ln=(LinearLayout) findViewById(R.id.LinearLayout); ln.setBackgroundResource((int) Double.parseDouble(mySetting) ); } public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub } }); 

above sharedprefrences how to implement in a surface view class

this is a surface class initialize () abstract method extends to the layout class

 public void initialize() { int n; Bitmap background; // Screen size Log.v("height",scwidth+"is width and height is "+scheight); background=getImage(R.drawable.image1); background = background.createScaledBitmap(background,scwidth,scheight, true); } 

below xml file - surface view

 <com.softwares.bird.BirdGame xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/ll_absolute" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FF000000" android:orientation="horizontal"> </com.softwares.bird.BirdGame> 

these are the general values ​​of prefrences, how can I pass a class of superficial form forward valuable suggestion I am amazed at this issue a few days in advance thanks

Answer 1

I really had this problem, and since my application wants to save a more complex object, I did it, I took the object serialized, then saved it to a file. Then I can check from any activity of this file and get the full object. There is no need to use garbage from string keys of prefixes and packets.

 /** * @param act - current activity calling the function * @return false if global Object not set and the dat file is not there or empty */ public static void setInFile(Activity act, Object_VO obj) { ((Object) act.getApplication()).setObjectState(obj); String ser = SerializeObject.objectToString(obj); if (ser!= null && !ser.equalsIgnoreCase("")) { SerializeObject.WriteSettings(act, ser, "android.dat"); } else { SerializeObject.WriteSettings(act, "", "android.dat"); } } 

You will need this for serialization and deserialization:

 /** * Take an object and serialize and then save it to preferences * */ public class SerializeObject { /** * Create a String from the Object using Base64 encoding * @param object - any Object that is Serializable * @return - Base64 encoded string. */ public static String objectToString(Serializable object) { ByteArrayOutputStream out = new ByteArrayOutputStream(); try { new ObjectOutputStream(out).writeObject(object); byte[] data = out.toByteArray(); out.close(); out = new ByteArrayOutputStream(); Base64OutputStream b64 = new Base64OutputStream(out,0); b64.write(data); b64.close(); out.close(); return new String(out.toByteArray()); } catch (IOException e) { e.printStackTrace(); } return null; } /** * Creates a generic object that needs to be cast to its proper object * from a Base64 ecoded string. * * @param encodedObject * @return */ public static Object stringToObject(String encodedObject) { try { return new ObjectInputStream(new Base64InputStream( new ByteArrayInputStream(encodedObject.getBytes()), 0)).readObject(); } catch (Exception e) { e.printStackTrace(); } return null; } /** * Save serialized settings to a file * @param context * @param data */ public static void WriteSettings(Context context, String data, String filename){ FileOutputStream fOut = null; OutputStreamWriter osw = null; try{ fOut = context.openFileOutput(filename, Context.MODE_PRIVATE); osw = new OutputStreamWriter(fOut); osw.write(data); osw.flush(); //Toast.makeText(context, "Settings saved",Toast.LENGTH_SHORT).show(); } catch (Exception e) { e.printStackTrace(); // Toast.makeText(context, "Settings not saved",Toast.LENGTH_SHORT).show(); } finally { try { if(osw!=null) osw.close(); if (fOut != null) fOut.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * Read data from file and put it into a string * @param context * @param filename - fully qualified string name * @return */ public static String ReadSettings(Context context, String filename){ StringBuffer dataBuffer = new StringBuffer(); try{ // open the file for reading InputStream instream = context.openFileInput(filename); // if file the available for reading if (instream != null) { // prepare the file for reading InputStreamReader inputreader = new InputStreamReader(instream); BufferedReader buffreader = new BufferedReader(inputreader); String newLine; // read every line of the file into the line-variable, on line at the time while (( newLine = buffreader.readLine()) != null) { // do something with the settings from the file dataBuffer.append(newLine); } // close the file again instream.close(); } } catch (java.io.FileNotFoundException f) { // do something if the myfilename.txt does not exits Log.e("FileNot Found in ReadSettings", "filename = " + filename); } catch (IOException e) { Log.e("IO Error in ReadSettings", "filename = " + filename); } return dataBuffer.toString(); } } 

and finally, you need to create a global state of the object that you can reference.

 package com.utils; /** * Global class to hold the application state of the object * */ public class ObjectState extends Application { private Object_VO obj; public Object_VO getObjectState() { return this.obj; } public void setObjectState(Object_VO o) { this.obj = o; } } 

Oh yes, and you need to update the AndroidManifest.xml file to include a link to the ObjectState, as it refers to an application like this ...

  <application android:name="com.utils.ObjectState" android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".MainActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity>