学步园

刚刚写完博文http://blog.csdn.net/jueblog/article/details/12209969 之后，就想着能不能让图片循环播放呢？

试验出一个简便易行的方法。

Activity作如下改进：

只需修改第36行即可：

imagedemo.setImageDrawable(getResources().getDrawable(iViews[position%iViews.length]));

即：

package com.app.test01;





import com.app.adapter.ImageAdapter;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Gallery;
import android.widget.ImageView;

public class GalleryTest extends Activity{
	Gallery gallery;
	ImageView imagedemo;
	ImageAdapter iAdapter = new ImageAdapter(this);
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_gallery);
		
		gallery = (Gallery) findViewById(R.id.gallery1);
		imagedemo = (ImageView) findViewById(R.id.imagedemo);
		
		gallery.setAdapter(iAdapter);
		gallery.setOnItemClickListener(new AdapterView.OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// TODO Auto-generated method stub
				Integer[] iViews = iAdapter.getmImageIds();
				imagedemo.setImageDrawable(getResources().getDrawable(iViews[position%iViews.length]));
			}
		});
	}
}

对BaseAdapter适配器做如下改进：

package com.app.adapter;

import com.app.test01.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;


public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    public ImageAdapter(Context c) {
        mContext = c;
    }

    public int getCount() { /* 重写方法getCount,传回图片数目总数 */
        return Integer.MAX_VALUE;
    }

    public Object getItem(int position) {/* 重写的getItem,传回position */
        return position;
    }

    public long getItemId(int position) {/*重写方法getItemId,传回position */ 
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView i = new ImageView(mContext);
        i.setImageResource(mImageIds[position%mImageIds.length]);/* 设定图片给imageView对象 */  
        i.setLayoutParams(new Gallery.LayoutParams(150,75));
        return i;
    }

    public Integer[] getmImageIds() {
		return mImageIds;
	}

	public void setmImageIds(Integer[] mImageIds) {
		this.mImageIds = mImageIds;
	}

	private Integer[] mImageIds = {
            R.drawable.image01,
            R.drawable.image02,
            R.drawable.image03,
            R.drawable.image04,
            R.drawable.image05,
            R.drawable.image06,
            R.drawable.image07,
            R.drawable.image08,
            R.drawable.image09,
    };
}

如你所见，仅需修改21行和34行。从而即可实现Gallery组件的循环播放。