[Android智慧型手機設計_Gallery元件]

2013-7-10 19:58| 發佈者: woff| 查看: 1539| 評論: 0|原作者: woff

摘要: 完成圖 layout上建立ImageView Gallery 1.建立 attr.xml ?xml version=1.0 encoding=utf-8? resources declare-styleable name=GalleryCCTU attr name=android:galleryItemBackground /attr /declare-styleable ...

完成圖

layout上建立ImageView Gallery

1.建立 attr.xml

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2.主程式 MainActivity.java

package org.galleryEx;
//匯入類別庫
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity {
//宣告資料型態
ImageView imageView;
Gallery gallery;
//宣告圖片陣列，檔案必須匯入到圖片資料夾
private Integer[] images = {
R.drawable.baby0, R.drawable.baby1, R.drawable.baby2, R.drawable.baby3,
R.drawable.baby4, R.drawable.baby5, R.drawable.baby6
};
//建立Adapter
public class ImageAdapter extends BaseAdapter {
int Background;
private Context context;
//建構元
public ImageAdapter(Context c) {
context = c;
//獲取陣列
TypedArray attr = context.obtainStyledAttributes(R.styleable.GalleryCCTU);
//變更背景
Background = attr.getResourceId(
R.styleable.GalleryEx_android_galleryItemBackground, 0);
//回收記憶體資源
attr.recycle();
}
@Override
//回傳幾張圖片
public int getCount() {
return images.length;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
//如果convertView為空，設定預設值到imageView，不然秀出點選圖
if (convertView == null) {
imageView = new ImageView(context);
imageView.setLayoutParams(new Gallery.LayoutParams(150, 150));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setBackgroundResource(Background);
} else {
imageView = (ImageView)convertView;
}
//獲取點選而改變圖片並回傳
imageView.setImageResource(images[position]);
return imageView;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViews();
}
private void findViews() {
imageView = (ImageView)findViewById(R.id.imageView);
gallery = (Gallery) findViewById(R.id.gallery);
//設定gallery Adapter
gallery.setAdapter(new ImageAdapter(this));
//監聽gallery點擊圖片即改變圖片到ImageView
gallery.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position, long id) {
//秀出訊息
Toast.makeText(MainActivity.this, "第 " + position+" 張", Toast.LENGTH_SHORT).show();
//改變圖片到ImageView
imageView.setImageResource(images[position]);
}
});
}
}

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[Android智慧型手機設計_Gallery元件]

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