这是我的代码。
public class MainActivity extends Activity {
ListView listview;
CustomListAdapter adapter;
private static ProgressDialog progressDialog;
public static int currentItem;
public static ArrayList<String> videoLIst;
public static MediaController mediaController ;
boolean pauseOnScroll = true;
boolean pauseOnFling = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view);
videoLIst = new ArrayList<String>();
mediaController = new MediaController(MainActivity.this);
videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
videoLIst.add("http://journey.coderspreview.com/uploads/experience/165/video/father-and-young-daughter.mp4");
videoLIst.add("http://journey.coderspreview.com/uploads/experience/185/video/couple-on-sail-boat.mp4");
videoLIst.add("http://journey.coderspreview.com/uploads/experience/39/video/VID-20141231-WA0006.mp4");
videoLIst.add("http://journey.coderspreview.com/uploads/experience/26/video/VID-20141216-WA0004.mp4");
videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
videoLIst.add("http://journey.coderspreview.com/uploads/experience/165/video/father-and-young-daughter.mp4");
videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
listview = (ListView) findViewById(R.id.list);
listview.setAdapter(new CustomListAdapter(this, videoLIst));
listview.setOnScrollListener(new AbsListView.OnScrollListener() {
private int mFirstVisibleRow = -1;
private int mActiveItem = -1;
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
int firstVisibleRow = listview.getFirstVisiblePosition();
if( mFirstVisibleRow != firstVisibleRow )
{
mFirstVisibleRow = firstVisibleRow;
// Cancel the video of the previous active item
VideoView prevActiveVideoView = getVideoViewForRow(mActiveItem);
if( prevActiveVideoView != null )
{
prevActiveVideoView.pause();
}
// Start the video of the new active item
mActiveItem = mFirstVisibleRow + 1;
VideoView newActiveVideoView = getVideoViewForRow(mActiveItem);
if(newActiveVideoView != null)
{
newActiveVideoView.start();
}
}
}
private VideoView getVideoViewForRow(int row)
{
int firstVisibleRow = listview.getFirstVisiblePosition();
View rowView = listview.getChildAt(row-firstVisibleRow);
return (rowView == null) ? null : (VideoView)rowView.findViewById(R.id.VideoView);
}
});
}
static class ViewHolderItem {
TextView textViewItem;
VideoView video;
ProgressBar progressbar;
}
public class CustomListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private ArrayList<String> videoList;
public CustomListAdapter(Activity activity, ArrayList<String> videoList) {
this.activity = activity;
this.videoList = videoList;
}
@Override
public int getCount() {
return videoList.size();
}
@Override
public Object getItem(int location) {
return videoList.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@SuppressLint("NewApi")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolderItem viewHolder;
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
{
convertView = inflater.inflate(R.layout.activity_main, null);
viewHolder = new ViewHolderItem();
viewHolder.video = (VideoView)convertView.findViewById(R.id.VideoView);
viewHolder.progressbar = (ProgressBar)convertView.findViewById(R.id.progress);
viewHolder.textViewItem =(TextView)convertView.findViewById(R.id.txvposition);
viewHolder.textViewItem.setText("Video"+position);
mediaController.setAnchorView(viewHolder.video);
Log.d("video url inadapter:", ""+videoLIst.toString());
Uri uri = Uri.parse(videoList.get(position));
viewHolder.video.setMediaController(mediaController);
viewHolder.video.setVideoURI(uri);
//viewHolder.video.start();
viewHolder.video.setOnPreparedListener(new OnPreparedListener() {
public void onPrepared(MediaPlayer arg0) {
viewHolder.progressbar.setVisibility(View.GONE);
viewHolder.video.start();
}
});
viewHolder.video.setOnInfoListener(new OnInfoListener() {
@Override
public boolean onInfo(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
Log.d("BUFFRRING START", "On_InFO");
if (MediaPlayer.MEDIA_INFO_BUFFERING_START == what) {
viewHolder.progressbar.setVisibility(View.VISIBLE);
Log.d("BUFFRRING START", "" + what);
}
if (MediaPlayer.MEDIA_INFO_BUFFERING_END == what) {
viewHolder.progressbar.setVisibility(View.GONE);
Log.d("BUFFRRING END", "" + what);
}
if (MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START == what) {
viewHolder.progressbar.setVisibility(View.GONE);
Log.d("RENDERING END", "" + what);
}
return false;
}
});
viewHolder.video.setOnErrorListener(new OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
Log.d("Error", "------>error" + what + "/" + extra);
if (extra != 0) {
Toast.makeText(MainActivity.this, "Can't Play Video",
Toast.LENGTH_SHORT).show();
}
return false;
}
});
int pos;
pos=viewHolder.video.getCurrentPosition();
Log.d("current item position:",""+pos);
convertView.setTag(viewHolder);
}
else{
viewHolder = (ViewHolderItem) convertView.getTag();
}
return convertView;
}
}
}
activity_main.xml中
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout01"
android:layout_width="match_parent"
android:layout_height="200dp"
android:orientation="vertical"
android:paddingBottom="2px"
android:paddingLeft="2px"
android:paddingRight="2px"
android:paddingTop="2px" >
<VideoView
android:id="@+id/VideoView"
android:layout_width="match_parent"
android:layout_height="100dp" >
</VideoView>
<ProgressBar
android:id="@+id/progress"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_gravity="center"
/>
<TextView
android:id="@+id/txvposition"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dp"
android:text="video"
/>
</LinearLayout>
activity_view.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="@color/list_divider"
android:dividerHeight="1dp"
android:listSelector="@drawable/list_row_selector" />
</RelativeLayout>
我如何解决这个问题？我想在listview中按顺序排列所有项目而不重复。我想按顺序播放所有视频，当我滚动listview时，它必须按顺序排列。当我将第一个视频作为列表视图中的最后一个滚动时，我在listview中有八个视频，序列也改变了我如何解决这个问题？
答案 0 :(得分：0)
您没有以正确的方式使用ListView回收机制，尝试更改您的getView()方法：
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolderItem viewHolder;
if (convertView == null){
inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.activity_main, null);
viewHolder = new ViewHolderItem();
viewHolder.video = (VideoView)convertView.findViewById(R.id.VideoView);
viewHolder.progressbar = (ProgressBar)convertView.findViewById(R.id.progress);
viewHolder.textViewItem =(TextView)convertView.findViewById(R.id.txvposition);
int pos;
pos=viewHolder.video.getCurrentPosition();
Log.d("current item position:",""+pos);
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolderItem) convertView.getTag();
}
viewHolder.textViewItem.setText("Video"+position);
mediaController.setAnchorView(viewHolder.video);
Log.d("video url inadapter:", ""+videoLIst.toString());
Uri uri = Uri.parse(videoList.get(position));
viewHolder.video.setMediaController(mediaController);
viewHolder.video.setVideoURI(uri);
//viewHolder.video.start();
viewHolder.video.setOnPreparedListener(new OnPreparedListener() {
public void onPrepared(MediaPlayer arg0) {
viewHolder.progressbar.setVisibility(View.GONE);
viewHolder.video.start();
}
});
viewHolder.video.setOnInfoListener(new OnInfoListener() {
@Override
public boolean onInfo(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
Log.d("BUFFRRING START", "On_InFO");
if (MediaPlayer.MEDIA_INFO_BUFFERING_START == what) {
viewHolder.progressbar.setVisibility(View.VISIBLE);
Log.d("BUFFRRING START", "" + what);
}
if (MediaPlayer.MEDIA_INFO_BUFFERING_END == what) {
viewHolder.progressbar.setVisibility(View.GONE);
Log.d("BUFFRRING END", "" + what);
}
if (MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START == what) {
viewHolder.progressbar.setVisibility(View.GONE);
Log.d("RENDERING END", "" + what);
}
return false;
}
});
viewHolder.video.setOnErrorListener(new OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
Log.d("Error", "------>error" + what + "/" + extra);
if (extra != 0) {
Toast.makeText(MainActivity.this, "Can't Play Video",
Toast.LENGTH_SHORT).show();
}
return false;
}
});
}
答案 1 :(得分：0)
如果convertView不为null，则表示您没有为列表视图的当前行创建视图。