Question

我有这个非常奇怪的问题，我使用simplecursoradapter创建了一个listview来显示数据库中的显示项目，我有25行，而lisview只显示10行来填充屏幕而不能向下滚动。

我被困在这里4个星期，PLZ帮助

活动显示listview

channellist = (ListView) findViewById(R.id.Channel);

        mDB = new ChannelDB(this);

        String[] columns = {mDB.KEY_ID, mDB.KEY_POSTER, mDB.KEY_CHANNEL, mDB.KEY_PATH, mDB.KEY_DBLINK};
        String   table   = mDB.channelS_TABLE;

        c = mDB.getHandle().query(table, columns, null, null, null, null, null);

        startManagingCursor(c);

        SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
                R.layout.channelview,
                c,
                new String[] {mDB.KEY_POSTER, mDB.KEY_CHANNEL, mDB.KEY_DBLINK},
                new int[] {R.id.poster, R.id.channel, R.id.douban});

        adapter.setViewBinder(new ChannelViewBinder(this));

        channellist.setAdapter(adapter);

我的数据库表和密钥

private static final String DATABASE_NAME = "channelDB";
    private static final int DATABASE_VERSION = 1;

    public static final String channelS_TABLE = "channels";

    private static final String CREATE_channelS_TABLE = "create table "+channelS_TABLE+" ("
                                         +KEY_ID+" integer primary key autoincrement, "
                                         +KEY_POSTER+" blob not null, "
                                         +KEY_CHANNEL+" text not null unique, "
                                         +KEY_DBLINK+" integer not null, "
                                         +KEY_PATH+" integer not null);";

最奇怪的一点是我每次都从logcat得到这个

12-06 12:07:13.299: DEBUG/skia(1009): --- SkImageDecoder::Factory returned null

表示数据库中的BitArray返回null

但是当我将LIMIT设置为查询时，显示另一页并且图片没问题，这意味着所有图像都可以从数据库转移到imageview，所以我不明白，为什么会发生这种情况？

我只是尝试从查询中删除图像，列表视图仍然在一个页面中，无法滚动

channelViewVinder.java

public class ChannelViewBinder implements SimpleCursorAdapter.ViewBinder {
    private ChannelDB mDB;
    private Context mContext = null;


    public ChannelViewBinder(Context context) {
        mContext = context;
    }
        public boolean setViewValue(View view, final Cursor cursor, int columnIndex) {
            mDB = new ChannelDB(mContext);
                if(view instanceof ImageView) {
                        ImageView iv = (ImageView) view;
                        byte[] img = cursor.getBlob(columnIndex);
                        iv.setImageBitmap(BitmapFactory.decodeByteArray(img, 0, img.length));
                        return true;
                }

              if(view instanceof ImageButton) {
                           ImageButton ib = (ImageButton) view;
                        ib.setOnClickListener(new  View.OnClickListener() {     
                            @Override
                            public void onClick(View v) {


                                String[] columns = {mDB.KEY_ID, mDB.KEY_POSTER, mDB.KEY_CHANNEL, mDB.KEY_PATH, mDB.KEY_DBLINK};
                                String   table   = mDB.channelS_TABLE;

                                Cursor c = mDB.getHandle().query(table, columns, null, null, null, null, null);

                                String dblink = c.getString(cursor.getColumnIndex(mDB.KEY_DBLINK));
                                Log.i("ChannelViewBinder", "path = " + dblink);
                                Intent intent = new Intent();
                                intent.setClass(mContext, Doubanframe.class);
                                Bundle bunde = new Bundle();
                                bunde.putString("dblink",dblink);
                                intent.putExtras(bunde);
                                mContext.startActivity(intent);
                                }
                            });

                }
                return false;
        }
}

这就是我插入条目的方式

Bitmap sherlock = BitmapFactory.decodeResource(getResources(), R.drawable.sherlock);

mDB.createchannelEntry(new ChannelPoster(sherlock, "xxxx" ,"http://appkon.com/hdtvs/channel/bigbang1.xml"  ,"http://movie.douban.com/subject/5372374/" ));

这是频道投标

public class ChannelPoster {
    private Bitmap poster;
    private String channel;
    private String path;
    private String dblink;

    public ChannelPoster(Bitmap pi, String c, String p, String d) {
        poster = pi;
        channel = c;
        path = p;
        dblink = d;
    }

    public Bitmap getPoster() { return poster; }
    public String getChannel() { return channel; }
    public String getPath() { return path; }
    public String getDBlink() { return dblink; }
}

Android Listview只显示一个页面，无法向下滚动

0 个答案: