如何在Datepicker中将最长日期设置为从当前日期起7天

Question

我想将最长日期设置为从当前日期起7天

public void showDateTimePicker() {
final Calendar currentDate = Calendar.getInstance();
Calendar calendar = Calendar.getInstance();
DatePickerDialog datePickerDialog = new DatePickerDialog(context, new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {

}, currentDate.get(Calendar.HOUR_OF_DAY), currentDate.get(Calendar.MINUTE), false).show();
}
}, currentDate.get(Calendar.YEAR), currentDate.get(Calendar.MONTH), currentDate.get(Calendar.DATE));
datePickerDialog.getDatePicker().setMinDate(System.currentTimeMillis());
datePickerDialog.getDatePicker().setMaxDate((System.currentTimeMillis() - 1000) + (1000*60*60*24*7));
datePickerDialog.show();
}

如果我采用上述方法，应用程序将在超过几个月时崩溃。我怎样才能做到这一点？崩溃如下：

java.lang.NullPointerException：尝试在android.widget.FrameLayout.layoutChildrenandroid.widget.FrameLayout.onLayout(FrameLayout.ja:270android.widget.FrameLayout.layoutChildren上的android.vidget.LinearLayout.setChildFrame(LinearLayout.java:1829(上的andrio.view.ViewGroup.layout(ViewGroup.java:6389(android.view.ViewGroup.layout的android.vindows.widget.FrameLayout.onLayout(FrameLayout.java:270(android.internal.widget.AlertDialogLayout.onLayout(AlertDialogLayout.ja:351(在android.widget.FrameLayout.onLayout(FrameLayout.ja:332(的android.view.view.ViewGroup.layout(ViewGroup.ja:6389(在andriod.widget.FrameLayout.onLayout(FrameLayout.java:332(在android.widget.FrameLayout.onLayout(FrameLayout.java:270(在android.view.view.layout(view.java:22844(在andrio.widget.FrameLayout.loonLayout(FrameLayout.java:270(android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2938(的android.vview.ViewRootImpl.doTraversal(ViewRootImpl.java:1952(android.view.Cchoreographer$CallbackRecord.run(Choreographer.java:972(在android.vview.CchoreOGrapher.doCallbacks(Choreographer.java:796(在andrio.view.Choreograper.doFrame(Chorerographer.java：731android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592

Answer 1

试试这个步骤1-

class MainActivity : AppCompatActivity() {
@SuppressLint("SetTextI18n")
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val button: AppCompatButton = findViewById(R.id.click)
button.setOnClickListener {
val mYear: Int
val mMonth: Int
val mDay: Int
val c = Calendar.getInstance()
mYear = c[Calendar.YEAR]
mMonth = c[Calendar.MONTH]
mDay = c[Calendar.DAY_OF_MONTH]

val datePickerDialog = DatePickerDialog(
this,
{ _, year, monthOfYear, dayOfMonth ->
button.text = dayOfMonth.toString() + "-" + (monthOfYear + 1) + "-" + year
},
mYear,
mMonth,
mDay
)
datePickerDialog.datePicker.minDate =
c.timeInMillis
datePickerDialog.datePicker.maxDate =
((c.timeInMillis) + ((1000 * 60 * 60 * 24 * 7)))
datePickerDialog.show()

}
}

}

步骤2-activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<androidx.appcompat.widget.AppCompatButton
android:id="@+id/click"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TEST" />
</androidx.appcompat.widget.LinearLayoutCompat>