如何设置数组以更改多个按钮的异步下载任务的URL? 这不起作用,我不知道如何解决它。
final String[] dlUrl = new String[]{"www.google.com/document.pdf", "www.google.com/document2.pdf", "www.google.com/document3.pdf"};{
for(int k = 0; i < dlUrl.length; i++) {
final String dlUrl = downloadFile.execute([k]);
}
我想让它更改以下代码部分:
private void startDownload() {
DownloadFile downloadFile = new DownloadFile();
downloadFile.execute("http://www.google.com/doc.pdf");
}
Async Task本身:
class DownloadFile extends AsyncTask<String, Integer, String> {
URL url = new URL(aurl[0]);
URLConnection connection = url.openConnection();
我有一个类似的数组,可以选择按钮,我想尝试将其添加到它...任何想法?
final OnClickListener listener = new OnClickListener() {
public void onClick(View v){
switch(v.getId()){
case R.id.sec1:
break;
case R.id.sec2:
break;
case R.id.sec3:
break;
}
}
};
final int[] btnIds = new int[]{R.id.sec1, R.id.sec2, R.id.sec3};{
for(int i = 0; i < btnIds.length; i++) {
final Button btn = (Button) findViewById (btnIds[i]);
btn.setOnClickListener(listener);
}
答案 0 :(得分:2)
final String[] dlUrl = new String[]{"www.google.com/document.pdf",
"www.google.com/document2.pdf",
"www.google.com/document3.pdf"};{
for(int k = 0; i < dlUrl.length; i++) {
final String dlUrl = downloadFile.execute([k]);
}
应该更像是
final String[] dlUrl = new String[]{"www.google.com/document.pdf",
"www.google.com/document2.pdf",
"www.google.com/document3.pdf"}; // { removed
for(int k = 0; k < dlUrl.length; k++) {
^
final String currentUrl = dlUrl[k];
^^^^^^^^
downloadFile.execute(currentUrl);
}
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通过反复试验学习Java和android很困难
......我必须补充一个非常糟糕的主意。