Android Open Source - meteoapp Cache Manager

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License

The source code is released under:

MIT License

Java Source Code

package pl.sznapka.meteoapp;
/*www  .j a  v  a  2 s  .co  m*/
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import android.os.Environment;

/**
 * @author wowo
 * Unified Cache Manager
 */
public class CacheManager {
  
  protected File defaultCacheDir;
  
  public CacheManager(File defaultCacheDir) {
    
    this.defaultCacheDir = defaultCacheDir;
  }
  
  public File getDefaultCacheDir() {
    
    return defaultCacheDir;
  }
  
  public Object loadFromCache(String target) {
      
      File cacheFile = getCacheFile(target); 
      if (cacheFile.exists()) {
        FileInputStream fis = null;
        ObjectInputStream ois = null;
        try {
          fis = new FileInputStream(cacheFile);
          ois = new ObjectInputStream(fis);
          return ois.readObject();
        } catch (Exception e) {
        } finally {
          try {
            if (fis != null) fis.close();
            if (ois != null) ois.close();
          } catch (Exception e) {
          }
        }
      } 
    return null;
    }
    /**
     * Stores in cache
     * 
     * @param cities
     */
  public void storeObjectInCache(String target, Object object) {
      
      FileOutputStream fos = null;
      ObjectOutputStream oos = null;
      
      try {
        fos = new FileOutputStream(getCacheFile(target));
        oos = new ObjectOutputStream(fos);
        oos.writeObject(object);
      } catch (Exception e) {
      } finally {
        try {
          if (oos != null) oos.close();
          if (fos != null) fos.close();
        } catch (Exception e) {
      }
      }
    }
    
    
    /**
     * Gets cache file
     * 
     * @param target
     */
    protected File getCacheFile(String target) {

      String state = Environment.getExternalStorageState();
      if (Environment.MEDIA_MOUNTED.equals(state) && !Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        System.out.println("Cache dir in SD card");
        File dataDir = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + "/meteoApp");
        dataDir.mkdir();
        
        return new File(dataDir.getAbsolutePath() + "/" + target + ".dat");
      } else {
        System.out.println("Cache dir in data");
        
        return new File(defaultCacheDir.getAbsoluteFile() + "/" + target + ".dat");
      }
  }
}

Java Source Code List

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