offsetLeftAndRight()究竟做了什么?文档说:"按指定的像素数量偏移此视图的水平位置"所以,这是否意味着如果视图的左侧位置为50并且在其上调用offsetLeftAndRight(20),则视图将移动20像素及其左侧位置将是(50-20)即30?
提前致谢.
在我的应用程序中,我使用DownloadManager来下载PDF,它在下载完成后通过BroadcastReceiver通知应用程序.我的问题是BroadcastReceiver的onReceive()方法被调用两次.代码如下:
在我的列表适配器中,运行for循环以下载所选的pdf.下载代码写在另一个类中,如下所示:
public static void downloadCheat(final SherlockFragmentActivity activity, final String cheatName, String pathOnServer){
Request request = new Request(
Uri.parse(ApplicationConstants.CHEAT_DOWNLOAD_SERVER_URL
+ "/" + pathOnServer + cheatName + ".pdf"));
if(Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD_MR1) {
request.setShowRunningNotification(true);
}
else {
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
}
final DownloadManager dm = (DownloadManager) activity
.getSystemService(Context.DOWNLOAD_SERVICE);
final long enqueue = dm.enqueue(request);
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
long i = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
System.out.println(i);
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
Query query = new …
Run Code Online (Sandbox Code Playgroud) 我在SQLite数据库的两个表table1和table2上使用INNER JOIN.如何从光标访问结果(两个表的列)?这两个表有两列同名.
String query = SELECT * FROM table1 INNER JOIN table2 ON table1.id=table2.id WHERE name like '%c%';
Cursor c = newDB.rawQuery(query, null);
Run Code Online (Sandbox Code Playgroud) 我在操作栏中使用下拉导航列表.我想在下拉导航列表中更改所选项目的背景颜色.我们如何通过java代码改变这个?