source: dispositivos_moviles/TibisayMovil/src/ve/gob/cenditel/tibisaymovil/PreferencesActivity.java @ 67541a6

package ve.gob.cenditel.tibisaymovil;
import java.io.File;

import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.Preference.OnPreferenceClickListener;
import android.preference.PreferenceActivity;
import android.provider.MediaStore;
import android.view.Window;
import android.widget.Toast;

public class PreferencesActivity extends PreferenceActivity implements OnPreferenceClickListener,OnPreferenceChangeListener{
        
        static final int PICK_IMAGE = 33;
        public static final String imageKey = "image";
        public static final String positionKey = "position";
        private static final int MAXWIDTH = 400;
        private static final int MAXHEIGHT = 400;
        private static final long SIZELIMIT = 1024 * 1024;
        
        private SharedPreferences options;
        private Preference imagePreference;
        
    @Override
    public void onCreate(Bundle savedInstanceState) {
                //Estilando la barra de titulo
                final boolean customTitleSupported = requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

        super.onCreate(savedInstanceState);

        addPreferencesFromResource(R.xml.preferences);
        
        this.options = this.getPreferenceManager().getSharedPreferences();
        
        

        
        this.imagePreference = (Preference) findPreference(PreferencesActivity.imageKey);
        this.imagePreference.setOnPreferenceClickListener(this);
        this.imagePreference.setOnPreferenceChangeListener(this);
        
        this.loadSummary();
        

        //Estilando Barra de titulo
                if(customTitleSupported)
                        getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title_bar);
        
    }
    
        private void loadSummary() {
            String path = options.getString(PreferencesActivity.imageKey, "");
        if (!path.equals("")){
                this.imagePreference.setSummary(path);
        }
        
        }

    
    
    @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
          String summary="";
          
          
          if (summary!=null && !summary.equals("")){
                  preference.setSummary((CharSequence) summary);
                          
                  }
          return true;
        }


        
        @Override
        public boolean onPreferenceClick(Preference preference) {
                
                if (preference.getKey().equals(PreferencesActivity.imageKey)){
                                Intent i = new Intent(
                                Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                                startActivityForResult(i, PreferencesActivity.PICK_IMAGE);
                                return true;
                }
                return false;
        }
    
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
             super.onActivityResult(requestCode, resultCode, data);
             
             
             if (requestCode == PreferencesActivity.PICK_IMAGE && resultCode == RESULT_OK){
                 
                 Uri selectedImage = data.getData();
                 String[] filePathColumn = { MediaStore.Images.Media.DATA };
         
                 Cursor cursor = getContentResolver().query(selectedImage,filePathColumn, null, null, null);
                 cursor.moveToFirst();
         
                 int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                 String imageSelectedPath = cursor.getString(columnIndex);
                 cursor.close();
                 
                 //Filter images if wrong format.
                 boolean validImage = this.validateImage(imageSelectedPath);
                 
                 if (validImage==true){
                         //Save and edit summary text in user interface.
                        SharedPreferences.Editor editor = this.options.edit();
                        editor.putString(PreferencesActivity.imageKey, imageSelectedPath);
                        editor.commit();
                        this.imagePreference.setSummary(imageSelectedPath);
                 }
                 
             
          
             }

             
             
             
        }

        //Check image dimensions and format.
        private boolean validateImage(String imageSelectedPath) {
                File f = new File(imageSelectedPath);
                long size = f.length();

                if (size <= (PreferencesActivity.SIZELIMIT)) {
                        
                        Bitmap chosenImage = BitmapFactory.decodeFile(imageSelectedPath);
                        
                        if (chosenImage !=null)
                                return this.checkDimensions(chosenImage);
                        else{
                                Toast.makeText(this, this.getString(R.string.errorformat),Toast.LENGTH_SHORT).show();
                                return false;
                        }

                } else {
                        Toast.makeText(this, this.getString(R.string.errorsize)+" "+(PreferencesActivity.SIZELIMIT)/(1024*1024)+"MB",Toast.LENGTH_SHORT).show();
                        return false;
                }
                
                
                
        }


        private boolean checkDimensions(Bitmap chosenImage) {

                int width = chosenImage.getWidth();
                int height = chosenImage.getHeight();

                if (width <= PreferencesActivity.MAXWIDTH && height <= PreferencesActivity.MAXHEIGHT) {
                        return true;
                        
                } else {

                        Toast.makeText( this,this.getString(R.string.errordimension) +" "+ PreferencesActivity.MAXWIDTH
                                                        + "x" + PreferencesActivity.MAXHEIGHT,Toast.LENGTH_SHORT).show();
                        return false;
                }               
        }


        

}