Java 安卓-调整微调器，使其不选择任何内容或在第一选择时不执行任何操作
如何使微调器不自动启动？我在这里看到了一些解决方案，但它们把我弄糊涂了。当活动开始时，下载立即开始，而这不是需要发生的。如何允许用户进行选择，而不是自动下载第一个项目 代码如下：Java 安卓-调整微调器，使其不选择任何内容或在第一选择时不执行任何操作,java,android,spinner,Java,Android,Spinner,如何使微调器不自动启动？我在这里看到了一些解决方案，但它们把我弄糊涂了。当活动开始时，下载立即开始，而这不是需要发生的。如何允许用户进行选择，而不是自动下载第一个项目 代码如下： public class SpinnerActivity extends Activity { public static final int DIALOG_DOWNLOAD_PROGRESS = 0; private ProgressDialog mProgressDialog; Spinner spDownlo
public class SpinnerActivity extends Activity {
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private ProgressDialog mProgressDialog;
Spinner spDownloadFrom;
private ArrayAdapter<CharSequence> spinnerArrayAdapter;
String url[] = {
"http://www.becker.cl/bases.pdf",
"http://www.pitt.edu/documents/campusmap0607.pdf",
"http://www.aara.ca/reg3317/web_page_doc.pdf",
"http://www.dataprotection.ie/documents/guidance/GuidanceFinance.pdf",
"http://www.fmbb2012.com/JumpingQualifica1.pdf",
"http://www.consulatdumaroc.ca/coloniefh22012.pdf",
"http://www.rgrdlaw.com/media/cases/140_Complaint.pdf" };
String name[] = {"bases.pdf", "campusmap0607.pdf", "web_page_doc.pdf",
"GuidanceFinance.pdf", "JumpingQualifica1.pdf",
"coloniefh22012.pdf", "140_Complaint.pdf", };
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mProgressDialog = new ProgressDialog(SpinnerActivity.this);
mProgressDialog.setMessage("Please be patient, file downloading...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setMax(100);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
spDownloadFrom = (Spinner) findViewById(R.id.Spinner01);
spinnerArrayAdapter = new ArrayAdapter<CharSequence>(this,
android.R.layout.simple_spinner_item, name);
spinnerArrayAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spDownloadFrom.setAdapter(spinnerArrayAdapter);
spDownloadFrom.setOnItemSelectedListener(new SpinnerListener(
spDownloadFrom));
}
public class SpinnerListener implements OnItemSelectedListener {
Spinner sp;
public SpinnerListener(View v) {
sp = (Spinner) findViewById(v.getId());
}
@Override
public void onItemSelected(AdapterView<?> parent, View v, int arg2,
long arg3) {
// Call to download class
startDownload(arg2);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
private void startDownload(int position) {
DownloadFile downloadFile = new DownloadFile(position);
downloadFile.execute(url[position]);
}
class DownloadFile extends AsyncTask<String, Integer, String> { // put your
// download
// code
private int position;
public DownloadFile(int position) {
this.position = position;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog.show();
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
mProgressDialog.setProgress(progress[0]);
}
@Override
protected String doInBackground(String... aurl) {
try {
URL url = new URL(aurl[0]);
URLConnection connection = url.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
int tickSize = 2 * fileLength / 100;
int nextProgress = tickSize;
Log.d(
"ANDRO_ASYNC", "Lenght of file: " + fileLength);
InputStream input = new BufferedInputStream(url.openStream());
String path = Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName() + "/files/";
File file = new File(path);
file.mkdirs();
File outputFile = new File(file, name[position]);
OutputStream output = new FileOutputStream(outputFile);
byte data[] = new byte[1024 * 1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
if (total >= nextProgress) {
nextProgress = (int) ((total / tickSize + 1) * tickSize);
this.publishProgress((int) (total * 100 / fileLength));
}
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
mProgressDialog.dismiss();
} catch (Exception e) {
Log.e("Spinner", "exception", e);
}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("Downloading", progress[0]);
}
@Override
protected void onPostExecute(String unused) {
mProgressDialog.dismiss();
File file = new File(Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName() + "/files/"
+ name[position]);
Intent testIntent = new Intent(Intent.ACTION_VIEW);
testIntent.setType("application/pdf");
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/pdf");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(SpinnerActivity.this,
"No Application Available to View PDF",
Toast.LENGTH_LONG).show();
}
}
}
}
公共类SpinnerActivity扩展活动{
公共静态最终整型对话框\u下载\u进度=0；
private ProgressDialog mProgressDialog；
纺纱机；
专用阵列适配器spinnerayadapter；
字符串url[]={
"http://www.becker.cl/bases.pdf",
"http://www.pitt.edu/documents/campusmap0607.pdf",
"http://www.aara.ca/reg3317/web_page_doc.pdf",
"http://www.dataprotection.ie/documents/guidance/GuidanceFinance.pdf",
"http://www.fmbb2012.com/JumpingQualifica1.pdf",
"http://www.consulatdumaroc.ca/coloniefh22012.pdf",
"http://www.rgrdlaw.com/media/cases/140_Complaint.pdf" };
字符串名称[]={“bases.pdf”、“campusmap0607.pdf”、“web\u page\u doc.pdf”，
“GuidanceFinance.pdf”、“JumpingQualifica1.pdf”，
“coloniefh22012.pdf”，“140_Complaint.pdf”，}；
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.main）；
mProgressDialog=新建ProgressDialog（spinneActivity.this）；
设置消息（“请耐心等待，文件下载…”）；
mProgressDialog.setUndeterminate（false）；
mProgressDialog.setMax（100）；
mProgressDialog.setProgressStyle（ProgressDialog.STYLE_水平）；
spDownloadFrom=（微调器）findViewById（R.id.Spinner01）；
SpinNearrayAdapter=新阵列适配器（此，
android.R.layout.simple\u微调器（项目、名称）；
纺纱机
.setDropDownViewResource（android.R.layout.simple\u微调器\u下拉菜单\u项）；
spDownloadFrom.setAdapter（spinnerrayadapter）；
spDownloadFrom.setOnItemSelectedListener（新SpinnerListener(
spDownloadFrom））；
}
公共类SpinnerListener实现了OnItemSelectedListener{
纺纱机；
公共SpinnerListener（视图v）{
sp=（微调器）findViewById（v.getId（））；
}
@凌驾
已选择公共视图（AdapterView父视图、视图v、内部arg2、，
长arg3）{
//调用下载类
开始下载（arg2）；
}
@凌驾
未选择公共无效（AdapterView arg0）{
//TODO自动生成的方法存根
}
}
专用void startDownload（内部位置）{
DownloadFile DownloadFile=新下载文件（位置）；
downloadFile.execute（url[position]）；
}
类DownloadFile扩展了AsyncTask{//将
//下载
//代码
私人职位；
公共下载文件（int位置）{
这个位置=位置；
}
@凌驾
受保护的void onPreExecute（）{
super.onPreExecute（）；
mProgressDialog.show（）；
}
@凌驾
受保护的void onProgressUpdate（整数…进度）{
super.onProgressUpdate（进度）；
mProgressDialog.setProgress（progress[0]）；
}
@凌驾
受保护的字符串背景（字符串…aurl）{
试一试{
URL=新URL（aurl[0]）；
URLConnection=url.openConnection（）；
connection.connect（）；
int fileLength=connection.getContentLength（）；
int tickSize=2*fileLength/100；
int-nextProgress=tickSize；
对数d(
“ANDRO_ASYNC”，“文件长度：”+fileLength）；
InputStream输入=新的BufferedInputStream（url.openStream（））；
String path=Environment.getExternalStorageDirectory（）
+“/Android/Data/”
+getApplicationContext（）.getPackageName（）+“/files/”；
文件=新文件（路径）；
mkdirs（）文件；
File outputFile=新文件（文件，名称[位置]）；
OutputStream output=新文件OutputStream（outputFile）；
字节数据[]=新字节[1024*1024]；
长总计=0；
整数计数；
而（（计数=输入。读取（数据））！=-1）{
总数+=计数；
如果（总计>=下一步）{
nextProgress=（int）（（总计/tickSize+1）*tickSize）；
此.publishProgress（（int）（总计*100/文件长度））；
}
输出.写入（数据，0，计数）；
}
output.flush（）；
output.close（）；
input.close（）；
mProgressDialog.disclose（）；
}捕获（例外e）{
Log.e（“微调器”、“异常”，e）；
}
返回null；
}
受保护的void onProgressUpdate（字符串…进度）{
Log.d（“下载”，进度[0]）；
}
@凌驾
受保护的void onPostExecute（字符串未使用）{
mProgressDialog.disclose（）；
File File=新文件（Environment.getExternalStorageDirectory（）
+“/Android/Data/”
+getApplicationContext（）.getPackageName（）+“/files/”
+姓名[职务]；
Intent testIntent=新的意图（Intent.ACTION\u视图）；
testIntent.setType（“application/pdf”）；
意图=新意图（）；
intent.setAction（intent.ACTION\u视图）；
Uri=Uri.fromFile（文件）；
setDataAndType（uri，“应用程序/pdf”）；
试一试{
星触觉（意向）；
}捕获（ActivityNotFounde异常）{
Toast.makeText（SpinnerActivity.this，
“没有可用于查看PDF的应用程序”，
Toast.LENGTH_LONG）.show（）；
}
}
}
}
public class SpinnerActivity extends Activity {
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private ProgressDialog mProgressDialog;
Spinner spDownloadFrom;
private ArrayAdapter<CharSequence> spinnerArrayAdapter;
String url[] = {
"http://www.becker.cl/bases.pdf",
"http://www.pitt.edu/documents/campusmap0607.pdf",
"http://www.aara.ca/reg3317/web_page_doc.pdf",
"http://www.dataprotection.ie/documents/guidance/GuidanceFinance.pdf",
"http://www.fmbb2012.com/JumpingQualifica1.pdf",
"http://www.consulatdumaroc.ca/coloniefh22012.pdf",
"http://www.rgrdlaw.com/media/cases/140_Complaint.pdf" };
String name[] = { "bases.pdf", "campusmap0607.pdf", "web_page_doc.pdf",
"GuidanceFinance.pdf", "JumpingQualifica1.pdf",
"coloniefh22012.pdf", "140_Complaint.pdf", };
private boolean checkFlag = false;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mProgressDialog = new ProgressDialog(SpinnerActivity.this);
mProgressDialog.setMessage("Please be patient, file downloading...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setMax(100);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
spDownloadFrom = (Spinner) findViewById(R.id.Spinner01);
spinnerArrayAdapter = new ArrayAdapter<CharSequence>(this,
android.R.layout.simple_spinner_item, name);
spinnerArrayAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spDownloadFrom.setAdapter(spinnerArrayAdapter);
SpinnerListener spListener = new SpinnerListener();
spDownloadFrom.setOnItemSelectedListener(spListener);
}
public class SpinnerListener implements OnItemSelectedListener {
public SpinnerListener() {
}
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long arg3) {
if(checkFlag){
startDownload(position);
}
checkFlag = true;
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
}
private void startDownload(int position) {
DownloadFile downloadFile = new DownloadFile(position);
downloadFile.execute(url[position]);
}
class DownloadFile extends AsyncTask<String, Integer, String> { // put your
// download
// code
private int position;
public DownloadFile(int position) {
this.position = position;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog.show();
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
mProgressDialog.setProgress(progress[0]);
}
@Override
protected String doInBackground(String... aurl) {
try {
URL url = new URL(aurl[0]);
URLConnection connection = url.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
int tickSize = 2 * fileLength / 100;
int nextProgress = tickSize;
Log.d(
"ANDRO_ASYNC", "Lenght of file: " + fileLength);
InputStream input = new BufferedInputStream(url.openStream());
String path = Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName() + "/files/";
File file = new File(path);
file.mkdirs();
File outputFile = new File(file, name[position]);
OutputStream output = new FileOutputStream(outputFile);
byte data[] = new byte[1024 * 1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
if (total >= nextProgress) {
nextProgress = (int) ((total / tickSize + 1) * tickSize);
this.publishProgress((int) (total * 100 / fileLength));
}
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
mProgressDialog.dismiss();
} catch (Exception e) {
Log.e("Spinner", "exception", e);
}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("Downloading", progress[0]);
}
@Override
protected void onPostExecute(String unused) {
mProgressDialog.dismiss();
File file = new File(Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName() + "/files/"
+ name[position]);
Intent testIntent = new Intent(Intent.ACTION_VIEW);
testIntent.setType("application/pdf");
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/pdf");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(SpinnerActivity.this,
"No Application Available to View PDF",
Toast.LENGTH_LONG).show();
}
}
}
}
公共类SpinnerActivity扩展活动{
公共静态最终整数对话框\u DOWNLOA