我有一个活动1，它将意图发送到活动2，如下所示：
活动1
periodDatetv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(Settings.this, SettingsPeriodDate.class);
startActivityForResult(i, 100);
}
});
活动2
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
todayCalendar = new GregorianCalendar();
pickedDateCalendar = new GregorianCalendar();
final Dialog dialog = new Dialog(SettingsPeriodDate.this);
dialog.setContentView(R.layout.perioddatesettings);
datePicker = (DatePicker) dialog.findViewById(R.id.DataPickerDate);
dialog.show();
Button okDialogButton = (Button) dialog
.findViewById(R.id.dialogButtonOK);
// if button is clicked, close the custom dialog
okDialogButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Calendar c = Calendar.getInstance();
int currentYear = c.get(Calendar.YEAR);
int currentMonth = c.get(Calendar.MONTH) + 1;
int currentDay = c.get(Calendar.DAY_OF_MONTH);
Day = datePicker.getDayOfMonth();
Month = datePicker.getMonth() + 1;
Year = datePicker.getYear();
todayCalendar.set(currentYear, currentMonth, currentDay);
pickedDateCalendar.set(Year, Month, Day);
System.err.println("Choseon date = " + Day + "/" + Month + "/"
+ Year);
System.err.println("Today date = " + currentDay + "/"
+ currentMonth + "/" + currentYear);
int Days = daysBetween(todayCalendar.getTime(),
pickedDateCalendar.getTime());
System.err.println("Daaaaays === " + Days);
if (pickedDateCalendar.after(todayCalendar) || Days >= 1) {
System.err.println("Inside if pop it");
PopIt("Error ", "Please check the date again");
}
else {
periodDateSharedPreferences(Year, Month, Day);
}
dialog.dismiss();
System.err.println("befor back");
Intent saved2 = new Intent(SettingsPeriodDate.this,
Settings.class);
startActivityForResult(saved2, 100);
}
});
Button cancelDialogButton = (Button) dialog
.findViewById(R.id.dialogButtonCancel);
// if button is clicked, close the custom dialog
cancelDialogButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
Intent i = new Intent(SettingsPeriodDate.this,Settings.class);
startActivity(i);
}
});
}
public int daysBetween(Date d1, Date d2) {
return (int) ((d2.getTime() - d1.getTime()) / (1000 * 60 * 60 * 24));
}
public void periodDateSharedPreferences(int calculatedPeriodYear,
int calculatedPeriodMonth, int calculatedPeriodDay) {
SharedPreferences periodDatePreferences = PreferenceManager
.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = periodDatePreferences.edit();
editor.putInt("periodChosenDay", calculatedPeriodDay);
editor.putInt("periodChosenMonth", calculatedPeriodMonth);
editor.putInt("periodChosenYear", calculatedPeriodYear);
editor.commit();
System.err.println("periodChosenDay preferences"
+ periodDatePreferences.getInt("periodChosenDay", 0));
System.err.println("periodChosenMonth preferences"
+ periodDatePreferences.getInt("periodChosenMonth", 0));
System.err.println("periodChosenYear preferences"
+ periodDatePreferences.getInt("periodChosenYear", 0));
Toast.makeText(SettingsPeriodDate.this, "The date was saved",
Toast.LENGTH_LONG).show();
finish();
}
public void PopIt(String title, String message) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Error");
builder.setMessage("Please check again");
builder.setCancelable(true);
final AlertDialog dlg = builder.create();
dlg.show();
final Timer t = new Timer();
t.schedule(new TimerTask() {
public void run() {
dlg.dismiss();
t.cancel();
}
}, 100000);
}
我在 活动1 中得到的结果如下：
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case 100:
System.err.println("after intent back 111111=== ");
if (resultCode == Activity.RESULT_OK) {
System.err.println("after intent back if=== ");
int day = data.getIntExtra("Day", 0);
int month = data.getIntExtra("Month", 0);
int year = data.getIntExtra("Year", 0);
System.err.println("after intent back =///== " + day + "-" + month
+ "-" + year);
Toast.makeText(Settings.this,day+"?"+month+"?"+year,Toast.LENGTH_SHORT).show();
periodDatetv.setText(day + "/" + month + "/" + year);
break;
}
}
}
但它永远不会运行onActivityResult方法！我的代码有什么问题？请告诉我..并提前谢谢
答案 0 :(得分：2)
在第二项活动的setResult(RESULT_OK);方法之前使用finish()
从您想要的第二个活动应该将一些结果返回到第一个活动
答案 1 :(得分：2)
您在活动2中注释了setResult()来电。
如果您使用startActivityForResult()开始活动，则您开始的活动（在您的情况下为活动2）每次即将完成时都需要致电setResult()。
见这个例子：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.blablabla)
//we do this here to make sure result is set even if user leaves
//activity, for example, by pressing back/home buttons
//result we set here will be overridden by any latter calls if they occur
setResult(RESULT_CANCELED);
//do some processing here
Intent intent=new Intent();
//now let's send the result back
intent.putExtra(result);
setResult(RESULT_OK, intent);
finish();
}
private void another_method() {
//do some processing here too
Intent intent=new Intent();
//sending the result back
intent.putExtra(result);
//need to call setResult() here too
setResult(RESULT_OK, intent);
finish();
}
答案 2 :(得分：1)
此处的问题是，您从SettingsPeriodDate开始Settings，然后从Settings开始SettingsPeriodDate。
您不应该再次启动“设置”。完成setResult()的工作后，只需finish()和SettingsPeriodDate
答案 3 :(得分：0)
致电setResult(RESULT_OK)。我在你的代码中找不到它。而不是设置结果，您再次调用活动。所以它会创造新的活动。不要使用活动1意图调用新活动。