เรามาดูรายละเอียด Source Code การสร้างโปรแกรมกัน
โดยเราต้องสร้างๆไฟล์หลักๆ 3 ไฟล์ คือ Main.java , main.xml และ strings.xml
//Main.java
package com.test;
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;
public class Main extends Activity {
// Step 1
Integer[] imageIds = {
R.drawable.pic1,
R.drawable.pic3,
R.drawable.pic4,
R.drawable.pic5,
R.drawable.pic6,
R.drawable.pic7
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Step 4
Gallery gallery = (Gallery) findViewById(R.id.gallery1);
gallery.setAdapter(new ImageAdapter(this));
gallery.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id){
ImageView imageView = (ImageView) findViewById(R.id.image1);
imageView.setImageResource(imageIds[position]);
}
});
}
// Step 2
public class ImageAdapter extends BaseAdapter{
// Step 2.1
private Context context;
private int itemBackground;
// Step 2.2
public ImageAdapter(Context c){
context = c;
TypedArray arr = c.obtainStyledAttributes(R.styleable.Gallery1);
itemBackground = arr.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
arr.recycle();
}
@Override
public int getCount() {
return imageIds.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) {
// Step 3
ImageView imageView = new ImageView(context);
imageView.setImageResource(imageIds[position]);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setLayoutParams(new Gallery.LayoutParams(150, 120));
imageView.setBackgroundResource(itemBackground);
return imageView;
}
}
}
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//main.xml
<?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"
android:gravity="center"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Gallery
android:id="@+id/gallery1"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</Gallery>
<ImageView
android:id="@+id/image1"
android:layout_width="220dp"
android:layout_height="250dp"
android:scaleType="fitXY">
</ImageView>
</LinearLayout>
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//string.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, Main!</string>
<string name="app_name">ImageContent</string>
<declare-styleable name="Gallery1">
<attr name="android:galleryItemBackground"/>
</declare-styleable>
</resources>
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