Java 获取ImageView可绘制ID并使用AsyncTask更改它
我想做的是:获取ImageView的src的id,将其与两个Drawable的id进行比较,然后使用AsyncTask交换它们(只是因为我想了解它是如何工作的)。 我在这里读过类似的问题,到目前为止,我得到的是:Java 获取ImageView可绘制ID并使用AsyncTask更改它,java,android,android-asynctask,imageview,Java,Android,Android Asynctask,Imageview,我想做的是:获取ImageView的src的id,将其与两个Drawable的id进行比较,然后使用AsyncTask交换它们(只是因为我想了解它是如何工作的)。 我在这里读过类似的问题,到目前为止,我得到的是: public class Main extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
public class Main extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView image = (ImageView) findViewById(R.id.img);
Integer integer = (Integer) image.getTag();
}
private class cambiarImagen extends AsyncTask<Integer, Integer, Integer> {
protected void onPreExecute() {
ImageView image = (ImageView) findViewById(R.id.img);
Integer integer = (Integer) image.getTag();
int img1 = R.drawable.zapato;
int img2 = R.drawable.zapatod;
}
@Override
protected Integer doInBackground(Integer... values) {
// parte logica
int num = values[0];
int zapato = values[1];
int zapatod = values[2];
if (num == zapato) {
num = zapatod;
} else if (num == zapatod) {
num = zapato;
}
return num;
}
protected Void onPostExecute(Integer... values) {
int num = values[0];
ImageView image = (ImageView) findViewById(R.id.img);
image.setTag(num);
return null;
}
}
public类主扩展活动{
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView图像=(ImageView)findViewById(R.id.img);
整数=(整数)image.getTag();
}
私有类cambiarImagen扩展异步任务{
受保护的void onPreExecute(){
ImageView图像=(ImageView)findViewById(R.id.img);
整数=(整数)image.getTag();
int img1=R.drawable.zapato;
int img2=R.drawable.zapatod;
}
@凌驾
受保护的整数doInBackground(整数…值){
//逻辑部分
int num=值[0];
int zapato=数值[1];
int zapatod=数值[2];
如果(num==zapato){
num=zapatod;
}else if(num==zapatod){
num=zapato;
}
返回num;
}
受保护的Void onPostExecute(整型…值){
int num=值[0];
ImageView图像=(ImageView)findViewById(R.id.img);
image.setTag(num);
返回null;
}
}
这当然行不通。
1.我不明白如何获取ImageView作为其src的可绘制文件的id。
2.我不明白参数是如何在AsyncTask中传递的;onPreExecute应该接收UI内容,doInbackground应该接收它以进行比较并返回应设置为ImageView的可绘制int,onPreExecute应该将其设置为ImageView
我不明白如何获取ImageView作为其src的可绘制文件的id
我没有这样做,所以可能不工作,但你应该能够使用
imageView.getDrawable().getId();
我不明白参数是如何在AsyncTask中传递的
无论您在task.execute()
中传递什么,都会被doInBackground()
接收。如果您调用publishProgress()
,则发送到那里的任何参数都会被onProgressUpdate()
接收。并且doInBackground()
中返回的数据会被onPostExecute()
接收
AsyncTask
,正如你所知,这不应该需要,但我知道你说过你想学习如何使用它。我有点困惑,除了这两件事之外,你到底有什么问题,所以如果我遗漏了什么,请详细说明
(如果有帮助的话)如果你想开始学习异步任务,你应该做其他任务。 如果我想学习ASyncTask,我会用进度条或其他东西来进行对话 编辑: 正如Samus Arin在主要帖子中评论的那样,你应该始终跟踪你正在显示的图像
if(currentImage == R.Drawable.image1){
image.setImageResource(R.Drawable.image2);
}else{
image.setImageResource(R.Drawable.image1);
}
看看我在异步任务中做了什么,也许它会给你一些想法 这是Monodroid/C#代码,不是原始的Java/Android(但语法非常接近)。因此,内部类不会获得对其包含对象的隐式引用,因此我传入了一个(在构造函数中称为outer)。我选择将其命名为“"”,作为.NET私有数据成员命名约定的词典扩展
public class MonthChangeTask : AsyncTask
{
private CalendarView _; // outer class
private DateTime _newMonth;
private bool _refreshInspectionRecordsRemote;
private bool _changingInspector;
private bool _todayButtonPressed;
private Android.App.ProgressDialog _progressDialog;
private IMXController _controller;
private Dictionary<string, string> _paramz;
private DateTime _newSelectedDate;
public MonthChangeTask( CalendarView outer, DateTime newMonth, bool changingInspector, bool refreshInspectionRecordsRemote, bool todayButtonPressed )
{
_ = outer;
_newMonth = newMonth;
_changingInspector = changingInspector;
_refreshInspectionRecordsRemote = refreshInspectionRecordsRemote;
_todayButtonPressed = todayButtonPressed;
}
protected override void OnPreExecute()
{
base.OnPreExecute();
_progressDialog = Android.App.ProgressDialog.Show( _ , "", "Loading Inspections...");
_newSelectedDate = _._calendar.SetMonth(new DateTime(_newMonth.Year, _newMonth.Month, 1));
AppSettingService.SetCalendarDate(_newMonth);
_paramz = new Dictionary<string, string>();
string target = MD.MxNAVIGATION.CONTROLLER.CALENDAR._name;
string action = MD.MxNAVIGATION.CONTROLLER.ACTION.GET;
string command = _refreshInspectionRecordsRemote
? ((int) MD.MxNAVIGATION.CONTROLLER.CALENDAR.Command.RefreshInspectionRecordsRemote).ToString()
: ((int) MD.MxNAVIGATION.CONTROLLER.CALENDAR.Command.RefreshInspectionRecordsLocal).ToString();
string url = target + "/" + action + "/" + command;
_controller = MXContainer.Instance.GetController(url, ref _paramz);
}
protected override Java.Lang.Object DoInBackground(params Java.Lang.Object[] @params)
{
if ( _paramz == null )
{
Log.Info(FIDB.TAG_APP, "MonthChangeTask.DoInBackground(): paramz = NULL");
}
else
{
_controller.Load( _paramz );
}
return true;
}
protected override void OnPostExecute(Java.Lang.Object result)
{
base.OnPostExecute(result);
_progressDialog.Dismiss();
_.Model = (CalendarVM)_controller.GetModel();
if (_changingInspector)
{
_._calendar.PermitSwitch = _.Model.Buttons.PermitsVisible;
_._calendar.ComplaintSwitch = _.Model.Buttons.ComplaintsVisible;
_._calendar.ProjectSwitch = _.Model.Buttons.ProjectsVisible;
_._calendar.PeriodicInspectionSwitch = _.Model.Buttons.PeriodicInspectionsVisible;
}
_.UpdateCalendar(_.Model.Inspections);
if( _todayButtonPressed )
{
_._calendar.SelectedDate = _._calendar.CurrentDate;
}
else
{
_._calendar.SelectedDate = _newSelectedDate;
}
_._calendar.Invalidate();
AppSettingService.SetCalendarDate( _._calendar.SelectedDate );
if ( _.Model.IsParcelCacheDownloading )
{
AnimationTask task = new AnimationTask( _ );
task.Execute( new Java.Lang.Object[1] );
}
}
}
公共类MonthChangeTask:AsyncTask
{
private CalendarView;//外部类
私人日期时间(newMonth);;
私人bool\u刷新检查记录远程;
私人布卢昌宁监察员;
今天按下私人按钮;
私有Android.App.ProgressDialog\u ProgressDialog;
专用IMXController\u控制器;
私人字典_paramz;
私人日期时间(newselectedate);;
公共月更改任务(日历视图外部、DateTime newMonth、布尔更改监控器、布尔刷新检查记录远程、布尔今天按钮按下)
{
_=外部;
_newMonth=newMonth;
_changingInspector=changingInspector;
_refreshInspectionRecordsRemote=refreshInspectionRecordsRemote;
_todayButtonPressed=todayButtonPressed;
}
受保护的覆盖无效OnPreExecute()
{
base.OnPreExecute();
_progressDialog=Android.App.progressDialog.Show(wu,“,“加载检查…”);
_newSelectedDate=u._calendar.SetMonth(新日期时间(_newMonth.Year,_newMonth.Month,1));
AppSettingService.SetCalendarDate(_newMonth);
_paramz=新字典();
字符串target=MD.MxNAVIGATION.CONTROLLER.CALENDAR.\u name;
string action=MD.MxNAVIGATION.CONTROLLER.action.GET;
string命令=\u refreshInspectionRecordsRemote
((int)MD.MxNAVIGATION.CONTROLLER.CALENDAR.Command.RefreshInspectionRecordsRemote.ToString()
:((int)MD.MxNAVIGATION.CONTROLLER.CALENDAR.Command.RefreshInspectionRecordsLocal.ToString();
字符串url=target+“/”+action+“/”+命令;
_controller=MXContainer.Instance.GetController(url,ref\u paramz);
}
受保护的重写Java.Lang.Object DoInBackground(params Java.Lang.Object[]@params)
{
如果(_paramz==null)
{
Log.Info(FIDB.TAG_APP,“MonthChangeTask.DoInBackground():paramz=NULL”);
}
其他的
{
_控制器加载(_paramz);
}
返回true;
}
受保护的重写void OnPostExecute(Java.Lang.Object结果)
{
base.OnPostExecute(结果);
_progressDialog.disclose();
_.Model=(CalendarVM)_controller.GetModel();
如果(_changingInspector)
{
_._calendar.PermitSwitch=u.Model.Buttons.PermitsVisible;
_.\u calendar.ComplaintSwitch=\u.Model.Buttons.ComplaintsVisible;
_.\u calendar.ProjectSwitch=\u.Model.Buttons。