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POForce gridview to draw all tiles
 

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  1. POForce gridview to draw all tiles
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    <p>I have an android gridview which i'm using some custom scrolling going on in, to let it scroll in two dimensions - this means that the default scrolling isn't called.</p> <p>I suspect this may be the reason that the rows that are off-screen are invisible. I know they're there, they affect the layout and everything, but they never draw.</p> <p>So my question is this - is there any way to force the gridview to draw all of its tiles when it's loaded, and not just the visible ones?</p> <p>Thanks.</p> <p>Edit: To clarify - In my tileadapter, i set the child count to exactly 225. In my gridview, a call to getChildCount() returns 165.</p> <p>Edit again: This only happens when the height of the gridview is greater than that of the screen - the children that are off-screen on the y axis are simply subtracted from the childcount - setting the size of the children to a number where they all fit snugly on screen removes the problem, but kills the purpose of scrolling.</p> <p>Code!</p> <p>XML Layout of activity:</p> <pre><code> &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:theme="@style/Theme.Custom" android:layout_width="match_parent" android:layout_height="match_parent"&gt; &lt;TextView android:id="@+id/logmessage" android:theme="@style/Theme.Custom" android:layout_width="fill_parent" android:layout_height="25dip" android:text="LogMessage"/&gt; &lt;RelativeLayout android:id="@+id/boardwrap" android:layout_weight="1" android:layout_height="fill_parent" android:layout_width="fill_parent" android:gravity="center_vertical"&gt; &lt;com.MyProject.GameGrid android:id="@+id/board" android:theme="@style/Theme.Custom" android:layout_width="wrap_content" android:layout_height="wrap_content" android:numColumns="15" android:stretchMode="none" android:verticalSpacing="0dip" android:horizontalSpacing="0dip" android:padding="0dip" android:columnWidth="20dip" android:scrollbars="none"/&gt; &lt;/RelativeLayout&gt; &lt;RelativeLayout android:id="@+id/toolbar" android:layout_width="fill_parent" android:layout_height="60dip" android:background="#FFFFFFFF"/&gt; &lt;/LinearLayout&gt; </code></pre> <p>Activity:</p> <pre><code>public class GameBoardActivity extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.gameboard); GameGrid Board = (GameGrid)findViewById(R.id.board); Board.setAdapter(new TileAdapter(this)); } } </code></pre> <p>GameGrid:</p> <pre><code>public GameGrid(Context context, AttributeSet attrs) { super(context, attrs); this.setNumColumns(15); DisplayMetrics metrics = new DisplayMetrics(); ((Activity) getContext()).getWindowManager().getDefaultDisplay().getMetrics(metrics); scale = metrics.density; smallSize = Math.round(20 * scale); largeSize = Math.round(40 * scale); columnwidth = largeSize; this.setColumnWidth(columnwidth); Common.DebugMessage(Float.toString(columnwidth)); } </code></pre> <p>You may notice i'm defining a small and a large size here - double tapping the screen allows you to switch between the two.</p> <p>Scrolling (what you helped me with earlier)</p> <pre><code>if (myState == TOUCH_STATE_SCROLLING) { final int deltaX = (int) (mLastX - x); final int deltaY = (int) (mLastY - y); mLastX = x; mLastY = y; int xpos = this.getScrollX(); int ypos = this.getScrollY(); int maxX = (columnwidth * 15) - super.getWidth(); int maxY = (columnwidth * 15) - super.getHeight(); if (xpos + deltaX &gt;= 0 &amp;&amp; xpos + deltaX &lt;= maxX &amp;&amp; ypos + deltaY &gt;= 0 &amp;&amp; ypos + deltaY &lt;= maxY ) { this.scrollBy(deltaX, deltaY); } else { this.scrollTo(xpos + deltaX &lt;= 0 ? 0 : xpos + deltaX &gt;= maxX ? maxX : xpos + deltaX, ypos + deltaY &lt;= 0 ? 0 : ypos + deltaY &gt;= maxY ? maxY : ypos + deltaY); } Common.DebugMessage(this.getChildCount()); } </code></pre> <p>Common.DebugMessage is just a helper method for printing debug messages to LogCat</p> <p>TileAdapter:</p> <pre><code>public TileAdapter(Context c) { mContext = c; } @Override public int getCount() { return 225; } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; int colWidth = ((GameGrid)parent).getColumnWidth(); if (convertView == null) { imageView = new ImageView(mContext); imageView.setLayoutParams(new GridView.LayoutParams(colWidth , colWidth)); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); imageView.setPadding(0, 0, 0, 0); } else { imageView = (ImageView)convertView; } imageView.setImageResource(R.drawable.tile); return imageView; } </code></pre>
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    1. USAndreas Eriksson
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    1. COAndreas, something JUST occured to me.... Try adding a `myGridView.invalidate()` to the end your `ACTION_MOVE:` in your `onTouchEvent()` (after the scrollBy() statement....)
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    2. COI've tried that before - nothing happens. Calling getChildCount after that results in the same number (165), though running the app on a device with less vertical space decreases that number to visible rows * 15.
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    3. COAndreas, when your bounty runs out, I will be re-offering a higher bounty so we can get more eyes on this. This way it does not get wasted.
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