我对布局和视图上的getWidth方法有问题,所以我尝试在父窗体中分离创建和放置视图。在开始时,活动启动loadResources()方法,该方法从数据库获取所有图标,为它们和其他循环创建图像,然后将它们分配给relativeLayout父代尝试将它们放置在屏幕上。但屏幕上没有什么?动态创建视图和getWidth方法android
下面的代码:
private void loadResources() {
cursor = managedQuery(Browser.BOOKMARKS_URI, projection, selection,
null, Browser.BookmarkColumns.VISITS + " DESC");
if(cursor.moveToFirst()) {
bookmarkCounter = 1;
ByteArrayInputStream blobImage;
do{
bookmark = new ImageView(this);
bookmark.setId(bookmarkCounter++);
bookmark.setBackgroundColor(Color.WHITE);
blobImage = new ByteArrayInputStream(
cursor.getBlob(cursor.getColumnIndex(BookmarkColumns.FAVICON)));
bookmark.setImageDrawable(
Drawable.createFromStream(blobImage, "" + bookmark.getId()));
params = new RelativeLayout.LayoutParams(
(int) (40 * scale), (int) (40 * scale));
params.topMargin = (int) (scale * 20);
params.leftMargin = (int) (scale * 20);
relativeLayout.addView(bookmark, params);
} while (cursor.moveToNext());
int idOfViewToTheLeft = 1;
for(int counter = 1; counter < bookmarkCounter; counter++) {
bookmark = (ImageView) findViewById(counter);
Log.v("WIDTH", "" + relativeLayout.getWidth());
if(bookmarkCounter > 1) {
if(relativeLayout.getWidth() > (bookmark.getLeft() + bookmark.getWidth())) {
params.addRule(RelativeLayout.RIGHT_OF, bookmark.getId() - 1);
} else {
params.addRule(RelativeLayout.BELOW, idOfViewToTheLeft);
idOfViewToTheLeft = bookmark.getId();
}
}
bookmark.setScaleType(ScaleType.CENTER_CROP);
bookmark.setLayoutParams(params);
}
setContentView(R.layout.main);
}
}
}
您将`setcontentview`放在方法的最后,并且只会将空的unbinded layout.main应用于屏幕。 – xandy 2011-02-12 11:08:18