Hi,

I am a Android and also Java Newbie... I have been working through all the available tutorials and some books lately. Now, I am a little bit stuck at this example - the Grid View:

Code: Select all

public class ImageAdapter extends BaseAdapter {
    private Context mContext;

    public ImageAdapter(Context c) {
        mContext = c;
    }

    public int getCount() {
        return mThumbIds.length;
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(8, 8, 8, 8);
        } else {
            imageView = (ImageView) convertView;
        }

        imageView.setImageResource(mThumbIds[position]);
        return imageView;
    }

    // references to our images
    private Integer[] mThumbIds = {
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7,
            R.drawable.sample_0, R.drawable.sample_1,
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7,
            R.drawable.sample_0, R.drawable.sample_1,
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7
    };
}

Instead of having an array I would rather like to retrieve the images from the SD card. I have already set up an emulator with an SD and pushed several photos on it, but I really don't know how I can access it to get the images.

If someone could help me out, that would be fantastic.
AndNewbie

Main.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
<ImageView
  android:id="@+id/imageview"
  android:layout_gravity="center"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:scaleType="center"
  />
</LinearLayout>


AndroidBitmap.java

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package com.exercise.AndroidBitmap;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;

public class AndroidBitmap extends Activity {

private final String imageInSD = "/sdcard/er.PNG";

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
   
      Bitmap bitmap = BitmapFactory.decodeFile(imageInSD);
      ImageView myImageView = (ImageView)findViewById(R.id.imageview);
      myImageView.setImageBitmap(bitmap);

  }
}


SOURCE: http://android-er.blogspot.com/2010/07/ ... -card.html

Hi Rollsroyc3!

In this example you provide the exact path to an image and load that one ( imageInSD = "/sdcard/er.PNG"; ).
But what if you want to load all the images in a certain folder, for example the default images in an adroid phones, that are displayed in the build in gallery. So you dont know how many images there are, you must load them dynamically. Any clue on how to do that?