android开发--Gallery

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Gallery控件，即Android的图片浏览控件，还是非常好用的，做个小例子说明一下：
首先是layout file:

<?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"
>
<Gallery
android:id="@+id/gallery"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>

接下来是代码，首先是需要定义一个BaseAdaper的子类来操作控制图片资源，然后在主类中通过Gallery.setAdapter(new ImageAdapter(this));来使用这个控制类。

package com.zx.galery;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class GalleryTest extends Activity {
private Gallery mGallery;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mGallery = (Gallery)findViewById(R.id.gallery);
mGallery.setAdapter(new ImageAdapter(this));
mGallery.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position, long id) {
Toast.makeText(GalleryTest.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
}
/*
* class ImageAdapter is used to control gallery source and operation.
*/
private class ImageAdapter extends BaseAdapter{
private Context mContext;
private Integer[] mImage = {
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
};
public ImageAdapter(Context c){
mContext = c;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mImage.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ImageView i = new ImageView (mContext);
i.setImageResource(mImage[position]);
i.setScaleType(ImageView.ScaleType.FIT_XY);
i.setLayoutParams(new Gallery.LayoutParams(136, 88));
return i;
}
};
}

以上只是一个很简单的例子，下一步就是要将Gallery与ImageSwitcher结合起来做一个电子相册。