Android:循環Gallery

public class MainActivity extends Activity {

private ImageAdapter imageAdapter=null;

private Gallery gallery=null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

gallery=(Gallery)findViewById(R.id.gallery1);

//設定Adapter

gallery.setAdapter(new ImageAdapter(this));

gallery.setGravity(Gravity.CENTER_HORIZONTAL);//效果目前不明     

gallery.setUnselectedAlpha(0.3f);//未選到的圖片比較暗                   

                gallery.setSpacing(20);//圖片與圖片間的間隔 

        

gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> adapterView, View view,

int position, long id) {

}

@Override

public void onNothingSelected(AdapterView<?> arg0) {

}

});

gallery.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

}

});

}

}

package com.briview.mgallery;

import ...

public class ImageAdapter extends BaseAdapter {

private Context context;

int imgArr[]={R.drawable.r0,R.drawable.r100,R.drawable.r150,R.drawable.r20};

public ImageAdapter(Context context){

this.context=context;

}

@Override

public int getCount() {

//修改返回值為無限大

return Integer.MAX_VALUE;

}

@Override

public Object getItem(int position) {

return imgArr[position];

}

@Override

public long getItemId(int position) {

return position;

}

@SuppressWarnings("deprecation")

@Override

public View getView(int position, View v, ViewGroup parent) {

//new a imageview to show pic

ImageView imageview=new ImageView(context);

//參數意義為讓使用者出圖片index範圍時,跳回第一張,Ex:5%4=1

imageview.setImageResource(imgArr[position%imgArr.length]);

//set the layout,determine how the pic to show

imageview.setLayoutParams(new Gallery.LayoutParams(480,800));

imageview.setScaleType(ImageView.ScaleType.CENTER);

imageview.setBackgroundColor(Color.alpha(1)); 

return imageview;

}

}