Android Open Source - AndroidHandsOn Gallery Activity

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Back to project page AndroidHandsOn.

License

The source code is released under:

Apache License

Java Source Code

package com.globant.mobile.handson;
/*  w  ww.j a va 2  s . co m*/
import java.io.File;
import java.io.IOException;

import com.globant.mobile.handson.provider.Bitmaps;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.StrictMode;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.NavUtils;
import android.util.Log;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.Toast;


public class GalleryActivity extends FragmentActivity {
  
  private static final String TAG = "GalleryActivity";
  private static final String ALBUM_NAME = "HandsOn";
  private File storageDir;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        if (BuildConfig.DEBUG) {
            enableStrictMode();
        }
        super.onCreate(savedInstanceState);

        if (getSupportFragmentManager().findFragmentByTag(TAG) == null) {
            final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            ft.add(android.R.id.content, new ImageGrid(), TAG);
            ft.commit();
        }
    }
  

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.gallery, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
      // This ID represents the Home or Up button. In the case of this
      // activity, the Up button is shown. Use NavUtils to allow users
      // to navigate up one level in the application structure. For
      // more details, see the Navigation pattern on Android Design:
      //
      // http://developer.android.com/design/patterns/navigation.html#up-vs-back
      //
      NavUtils.navigateUpFromSameTask(this);
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
  
  @TargetApi(11)
    private void enableStrictMode() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
            StrictMode.ThreadPolicy.Builder threadPolicyBuilder =
                    new StrictMode.ThreadPolicy.Builder()
                            .detectAll()
                            .penaltyLog();
            StrictMode.VmPolicy.Builder vmPolicyBuilder =
                    new StrictMode.VmPolicy.Builder()
                            .detectAll()
                            .penaltyLog();

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                threadPolicyBuilder.penaltyFlashScreen();
                vmPolicyBuilder
                        .setClassInstanceLimit(GalleryActivity.class, 1)
                        .setClassInstanceLimit(GalleryActivity.class, 1);
            }
            StrictMode.setThreadPolicy(threadPolicyBuilder.build());
            StrictMode.setVmPolicy(vmPolicyBuilder.build());
        }
    }
  
  private void initStorageDir() throws IOException{    
    String state = Environment.getExternalStorageState();
    storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), ALBUM_NAME);
    //Checks if the external storage is mounted
    if(Environment.MEDIA_MOUNTED.equals(state)){
      if(!storageDir.exists()){
        if(!storageDir.mkdirs()){
          Log.d("HandsOn", "Failed to create directory");
        }
      } else{
        File[] files = storageDir.listFiles();
        if(files != null){
          Bitmaps.imageUrls = new String[files.length];
          Bitmaps.imageThumbUrls = new String[files.length];
          for(int i = 0; i < files.length; i++){
            Bitmaps.imageUrls[i] = files[i].getAbsolutePath();
            Bitmaps.imageThumbUrls[i] = files[i].getAbsolutePath();
          }
        }
      }
    }else if(Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)){
      //External storage mounted but read only, can't write on it
      throw new IOException("External memory in READ ONLY mode");
    }else{
      //External storage not available/mounted/etc
      throw new IOException("External memory not available");
    }
  }
  
  @Override
  public void onResume(){
    super.onResume();
    try {
      initStorageDir();
    } catch (IOException e) {
      if (BuildConfig.DEBUG) {
                Log.d(TAG, "External storage not initialized");
            }
      e.printStackTrace();
    }
  }
}

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