gallery 循环播放

最新推荐文章于 2021-05-27 22:02:44 发布

原创最新推荐文章于 2021-05-27 22:02:44 发布 · 1k 阅读

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#gallery #Android

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/*让Galllery循环播放的方法
* 1.　使getCount方法返回一个很大的值。建议返回Integer.MAX_VALUE，这个值可以到达20亿多。
* 2.　在getView方法中通过取余来循环取得resIds数组中的图像资源ID。
* 3.循环Gallery参考http://blog.youkuaiyun.com/herryz/article/details/6141957
*/

并修正其中的一个bug。

直接贴代码：

Java代码

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
public class App extends Activity {
private Integer[] imgs = {
R.drawable.photo1,
R.drawable.photo2,
R.drawable.photo3,
R.drawable.photo4,
R.drawable.photo5,
R.drawable.photo6,
R.drawable.photo7,
R.drawable.photo8
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Gallery g = (Gallery) findViewById(R.id.gallery);
g.setAdapter(new ImageAdapter(this));
g.setOnItemClickListener(new Gallery.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
Log.i("tag", "position==="+position);
}
});
}
class ImageAdapter extends BaseAdapter{
private Context context;
ImageAdapter(Context context){
this.context=context;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return Integer.MAX_VALUE;//返回无限多个
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return imgs[position%imgs.length];//修正！
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position%imgs.length;//修正！
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
// Log.i("tag", "position=="+getItemId(position));
ImageView iv = new ImageView(context);
iv.setImageResource(imgs[position%imgs.length]);//取余
iv.setScaleType(ImageView.ScaleType.CENTER);
iv.setLayoutParams(new Gallery.LayoutParams(150, 100));
return iv;
}
}
}

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class App extends Activity {
	private Integer[] imgs = {
					R.drawable.photo1,
					R.drawable.photo2,
					R.drawable.photo3,
					R.drawable.photo4,
					R.drawable.photo5,
					R.drawable.photo6,
					R.drawable.photo7,
					R.drawable.photo8
					};
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Gallery g = (Gallery) findViewById(R.id.gallery);
        g.setAdapter(new ImageAdapter(this));
        g.setOnItemClickListener(new Gallery.OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// TODO Auto-generated method stub
				Log.i("tag", "position==="+position);
			}
		});
    }
    class ImageAdapter extends BaseAdapter{
    	private Context context;
    	ImageAdapter(Context context){
    		this.context=context;
    	}
		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return Integer.MAX_VALUE;//返回无限多个
		}
		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return imgs[position%imgs.length];//修正！
		}
		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return position%imgs.length;//修正！
		}
		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
//			Log.i("tag", "position=="+getItemId(position));
			ImageView iv = new ImageView(context);
			iv.setImageResource(imgs[position%imgs.length]);//取余
			iv.setScaleType(ImageView.ScaleType.CENTER);
			iv.setLayoutParams(new Gallery.LayoutParams(150, 100));
			return iv;
		}
    }
}

目标：gallery播放时，图片向左或者向右，到头后都会留点空白，这样的效果很不好，虽然可以使用setselection()函数设置默认显示图片，留有空白是仍然存在的，于是为了解决此问题，好像大家都是使用gallery的循环播放。

为了实现循环播放，一般有三个地方，需要修改：

（1）修改ImageAdapter中的getCount（）（返回图像的总数量）函数：

         //　返回图像总数     
        
         public
         　
         int
         　getCount() 
        
         { 
        
         //return　images.length; 
        
         return 
         Integer.MAX_VALUE; 
        
         }

（2）修改ImageAdapter中的getView（）函数：

         public 
          View getView(
         int 
          position, View convertView, ViewGroup parent) 
        
         {   
        
         ImageView i = 
         new 
         ImageView(mContext); 
        
         //i. setImageResource(myImageIds[position]);  
        
         //循环取图像数据      
        
         i.setImageResource(myImageIds[position%images.length]); 
         /* 设定图片给imageView对象 */   
        
         i.setScaleType(ImageView.ScaleType.FIT_XY);            /* 重新设定图片的宽高 */   
        
         i.setLayoutParams(new Gallery.LayoutParams(136, 88));  /* 重新设定Layout的宽高 */   
        
         i.setBackgroundResource(mGalleryItemBackground);       /* 设定Gallery背景图 */   
        
         return i;                                              /* 传回imageView物件 */  
        
         }