[求助]GridView载入过慢问题

youx 2011-08-29 06:05:03
要实现功能如下图:

问题:用GridView做了一个2*X的影片列表，但是只要VideoBean列表>1时，getView方法会自动重复调用20多次才能完成加载，导致page2画面要等差不多30S才能显示，为什么getView要重复调用这么多次？

// 设定gView的Adapter为自定义的VideoAdapter
GridView gView = (GridView) findViewById(R.id.myGrid);
gView.setAdapter(new VideoAdapter(this, videoBeans, path));

/* 自定义的Adapter，继承android.widget.BaseAdapter */

public class VideoAdapter extends BaseAdapter {

	private LayoutInflater mInflater;

	private List<VideoBean> items;

	private String filePath;

	

	public VideoAdapter(Context context, List<VideoBean> it, String path) {

		mInflater = LayoutInflater.from(context);

		items = it;

		filePath = path;

	}



	/* 因继承BaseAdapter，需重写以下method */

	@Override

	public int getCount() {

		return items.size();

	}



	@Override

	public Object getItem(int position) {

		return items.get(position);

	}



	@Override

	public long getItemId(int position) {

		return position;

	}



	@Override

	public View getView(int position, View conView, ViewGroup par) {

		ViewHolder holder;



		if (conView == null) {

			/* 使用自定义的video_view作为Layout */

			conView = mInflater.inflate(R.layout.video_view, null);

//			/* 初始化holder */

			holder = new ViewHolder();

			holder.image = (ImageView) conView.findViewById(R.id.videoImage);

			holder.info = (TextView) conView.findViewById(R.id.videoInfo);

			holder.size = (TextView) conView.findViewById(R.id.videoSize);

			holder.videoPlay = (ImageView) conView.findViewById(R.id.playImage);

			conView.setTag(holder);

		} else {

			holder = (ViewHolder) conView.getTag();

		}

//		/* 设定名称 */

		VideoBean videoBean = (VideoBean) items.get(position);

		if (!videoBean.isBlankBean()) {

			holder.info.setText("简介: " + videoBean.getVideoInfo());

			holder.size.setText("片长: " + videoBean.getVideoSize());

			holder.videoPlay.setOnClickListener(new ButtonListener());

		} else {

			holder.videoPlay.setVisibility(View.INVISIBLE);

		}

        

		// 划出表格线

		LinearLayout linL = (LinearLayout)conView.findViewById(R.id.linL);

		System.out.println("===========GridView line start======================");

		System.out.println("position = " + position);

		System.out.println("===========GridView line end=========================");

		int id = position;

		if (id == 0) {

			setPadding(linL, 1);

		}else if(id == 1) {

			setPadding(linL, 2);

		}else {

			if (id % 2 == 0) {

				setPadding(linL, 3);

			} else  {

				setPadding(linL, 4);

			}

		}

		

		if (!videoBean.isBlankBean()) {

			/* 设定照片 */

			URL url;

			try {

				url = new URL(filePath + videoBean.getId()

						+ "."

						+ videoBean.getPicType());

				URLConnection conn = url.openConnection();

				conn.connect();

				Bitmap bm = BitmapFactory.decodeStream(conn.getInputStream());

				holder.image.setImageBitmap(bm);

			} catch (Exception e) {

				e.printStackTrace();

			}

		}

		return conView;

	}

	

    private void setPadding(LinearLayout linL, int lineType){

    	switch (lineType) {

    	case 1: linL.setPadding(1, 1, 1, 1);break;

    	case 2: linL.setPadding(0, 1, 1, 1);break;

    	case 3: linL.setPadding(1, 0, 1, 1);break;

    	case 4: linL.setPadding(0, 0, 1, 1);break;

    	case 5: linL.setPadding(1, 0, 1, 1);break;

    	case 6: linL.setPadding(0, 0, 1, 1);break;

    	}

    }

    

	class ButtonListener implements OnClickListener {

		@Override

		public void onClick(View v) {

			// TODO Auto-generated method stub

		}

	}



	private class ViewHolder {

		ImageView image;

		TextView size;

		TextView info;

		ImageView videoPlay;

	}

	

    // 设置GridView的网格项不会触发onChick事件

	@Override

	public boolean areAllItemsEnabled() {

		return false;

	}

	@Override

	public boolean isEnabled(int position) {

		return false;

	}

video_view.xml


<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

  xmlns:android="http://schemas.android.com/apk/res/android"

  android:layout_width="fill_parent"

  android:layout_height="fill_parent"

  android:orientation="vertical"

  android:background="@color/darkgray"

>

 <LinearLayout

  xmlns:android="http://schemas.android.com/apk/res/android"

  android:id="@+id/linL"

  android:layout_width="fill_parent"

  android:layout_height="fill_parent"

  android:orientation="vertical"

  android:background="@color/darkgray"

>

  <TableLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="horizontal"

    android:background="@color/white"

  >

	  <TableRow>

	  	  <FrameLayout 

		  xmlns:android="http://schemas.android.com/apk/res/android"

		  android:layout_width="fill_parent"

		  android:layout_height="wrap_content"

		  android:paddingLeft="2dip"

		  android:paddingTop="5dip"

		  android:paddingBottom="5dip"

		  >

		      <ImageView android:id="@+id/videoImage"

		        android:layout_width="150dip"

		        android:layout_height="140dip"

		      />

		      <ImageView 

				android:id="@+id/playImage"

			    android:layout_width="30dip"

			    android:layout_height="30dip" 

			    android:layout_gravity="center_vertical|center_horizontal"

			    android:src="@drawable/video"

			  /> 

		  </FrameLayout>

	  	  <LinearLayout

			xmlns:android="http://schemas.android.com/apk/res/android"

			android:layout_width="fill_parent"

			android:layout_height="fill_parent"

			android:orientation="vertical"

			android:paddingTop="10dip"

			android:paddingBottom="10dip"

		  >

                         <TextView android:id="@+id/videoInfo"

			    android:layout_width="150dip"

			    android:layout_weight="1.0" 

			    android:layout_height="wrap_content" 

			    android:gravity="left"

			    android:textSize="12sp"

			    android:paddingLeft="3dip"

			    android:textColor="@color/black"

			  />

			  <TextView android:id="@+id/videoSize"

			    android:layout_width="fill_parent"

			    android:layout_weight="0.0"

			    android:layout_height="wrap_content" 

			    android:gravity="bottom"

			    android:textSize="12sp"

			    android:paddingLeft="3dip"

			    android:textColor="@color/black"

			  />

		 </LinearLayout>

	  </TableRow>

  </TableLayout>

   </LinearLayout>

</LinearLayout>

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Bright_java 2011-09-23
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[Quote=引用 8 楼 mylzc 的回复:]
刚才说的是listview。。不过gridview同理
[/Quote]


同理吗？gridview发放调用多次是正常的。一句话这里调用gridview的次数是不确定。
youx 2011-09-08
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设了个全局变量让重复调用时不调用取图片方法。为什么重复还是没解决..
mylzc 2011-08-30
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else {
holder.videoPlay.setVisibility(View.INVISIBLE);
}

你把这段注释掉看看
youx 2011-08-30
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[Quote=引用 1 楼 mylzc 的回复:]

getview()中的这段代码会阻塞界面线程，导致界面卡死
url = new URL(filePath + videoBean.getId()
+ "."
+ videoBean.getPicType());
URLConnection conn = url.openConnection()……
[/Quote]
注释掉这段获取图片的代码，只保留holder.info(简介)和holder.size(holder.size)后速度确实快了，还有个疑问：为什么getView()方法会重复这么多次？
以下是注释掉获取图片的代码后的LOG:
08-30 03:58:49.631: INFO/ActivityManager(67): Starting activity: Intent { cmp=cn.com.cits.act/.video.MediaListActivity (has extras) }
08-30 03:58:51.812: INFO/global(340): Default buffer size used in BufferedReader constructor. It would be better to be explicit if an 8k-char buffer is required.
08-30 03:58:59.681: WARN/ActivityManager(67): Launch timeout has expired, giving up wake lock!
08-30 03:58:59.783: DEBUG/dalvikvm(340): GC_FOR_MALLOC freed 4188 objects / 487192 bytes in 126ms
08-30 03:58:59.972: WARN/ActivityManager(67): Activity idle timeout for HistoryRecord{43f3d920 cn.com.cits.act/.video.MediaListActivity}
08-30 03:59:14.761: INFO/ActivityManager(67): Displayed activity cn.com.cits.act/.video.MediaListActivity: 24830 ms (total 24830 ms)

system.out.println 输出部分
08-30 03:58:51.882: INFO/System.out(340): VideoBean [id=1, videoName=canon介绍, videoSize=7分56秒, videoInfo=canon介绍, videoType=mp4, picType=jpg, blankBean=false]
08-30 03:58:51.892: INFO/System.out(340): ----- path = http://172.16.192.8:8080/NewCitsCRMS_service/upload/-----
08-30 03:58:52.552: INFO/System.out(340): getView Start!!!
08-30 03:58:52.902: INFO/System.out(340): getView Start!!!
08-30 03:58:53.022: INFO/System.out(340): getView Start!!!
08-30 03:58:53.152: INFO/System.out(340): getView Start!!!
08-30 03:58:53.321: INFO/System.out(340): getView Start!!!
08-30 03:58:53.442: INFO/System.out(340): getView Start!!!
08-30 03:58:53.582: INFO/System.out(340): getView Start!!!
08-30 03:58:53.712: INFO/System.out(340): getView Start!!!
08-30 03:58:53.862: INFO/System.out(340): getView Start!!!
08-30 03:58:53.982: INFO/System.out(340): getView Start!!!
08-30 03:58:54.112: INFO/System.out(340): getView Start!!!
08-30 03:58:54.321: INFO/System.out(340): getView Start!!!
08-30 03:58:54.601: INFO/System.out(340): getView Start!!!
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08-30 03:59:10.031: INFO/System.out(340): getView Start!!!
08-30 03:59:10.163: INFO/System.out(340): getView Start!!!
08-30 03:59:10.291: INFO/System.out(340): getView Start!!!
08-30 03:59:10.421: INFO/System.out(340): getView Start!!!
08-30 03:59:10.582: INFO/System.out(340): getView Start!!!
08-30 03:59:10.703: INFO/System.out(340): getView Start!!!
08-30 03:59:10.841: INFO/System.out(340): getView Start!!!
08-30 03:59:10.971: INFO/System.out(340): getView Start!!!
08-30 03:59:11.112: INFO/System.out(340): getView Start!!!
08-30 03:59:11.251: INFO/System.out(340): getView Start!!!
08-30 03:59:11.392: INFO/System.out(340): getView Start!!!
08-30 03:59:11.521: INFO/System.out(340): getView Start!!!
08-30 03:59:11.751: INFO/System.out(340): getView Start!!!
08-30 03:59:11.882: INFO/System.out(340): getView Start!!!
08-30 03:59:12.021: INFO/System.out(340): getView Start!!!
08-30 03:59:12.151: INFO/System.out(340): getView Start!!!
08-30 03:59:12.311: INFO/System.out(340): getView Start!!!
08-30 03:59:12.442: INFO/System.out(340): getView Start!!!
08-30 03:59:12.571: INFO/System.out(340): getView Start!!!
08-30 03:59:12.722: INFO/System.out(340): getView Start!!!
08-30 03:59:12.881: INFO/System.out(340): getView Start!!!
08-30 03:59:13.012: INFO/System.out(340): getView Start!!!
08-30 03:59:13.141: INFO/System.out(340): getView Start!!!
08-30 03:59:13.291: INFO/System.out(340): getView Start!!!
08-30 03:59:13.442: INFO/System.out(340): getView Start!!!
08-30 03:59:13.561: INFO/System.out(340): getView Start!!!
08-30 03:59:13.703: INFO/System.out(340): getView Start!!!
08-30 03:59:13.832: INFO/System.out(340): getView Start!!!
mylzc 2011-08-30
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刚才说的是listview。。不过gridview同理
mylzc 2011-08-30
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[Quote=引用 6 楼 west_link 的回复:]

getView被重复调用是正常的,adapter里有多少条记录它就会被调用多少次,对于数据较多的情况可以考虑根据滚动位置来按需加载。
[/Quote]

不是adapter有多少条记录就被调用多少次。
getView()是在listitem进入listview可见区域时被调用的。
一开始如果有10个listitem可见，则调用10次getView()。
当listview滚动时会有新的listitem进入可见区域，此时调用getview()的次数与滚入的listitem个数是一致的。
West_Link 2011-08-30
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getView被重复调用是正常的,adapter里有多少条记录它就会被调用多少次,对于数据较多的情况可以考虑根据滚动位置来按需加载。
youx 2011-08-30
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[Quote=引用 3 楼 mylzc 的回复:]

else {
holder.videoPlay.setVisibility(View.INVISIBLE);
}

你把这段注释掉看看
[/Quote]
这段去掉后还是有同样的问题....getView重复调用
sunmable 2011-08-30
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通常情况下我们用ListView的时候要把耗时的东西放到线程里面，然后用handler发送出来，更新UI。

不建议使用AsynTask(同步任务)类
mylzc 2011-08-29
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getview()中的这段代码会阻塞界面线程，导致界面卡死
url = new URL(filePath + videoBean.getId()
+ "."
+ videoBean.getPicType());
URLConnection conn = url.openConnection();
conn.connect();
Bitmap bm = BitmapFactory.decodeStream(conn.getInputStream());

你尝试下开启另外一条线程连接网络获取数据，然后使用handler来更新ui。
http://rayleung.iteye.com/blog/411860
也可以使用AsynTask类
http://www.iteye.com/topic/507442
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