AndroidStudio日期选择器及日期对话框

Android Studio 日期选择器 及日期对话框
activity_main.xml



xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:orientation="vertical"
>
android:text="hello world!"
android:layout_gravity="center"
android:id="@+id/tv"
android:layout_
android:layout_/>
android:layout_marginTop="50dp"
android:layout_gravity="center"
android:layout_
android:layout_/>
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:text="按钮"
android:id="@+id/bt"
android:layout_
android:layout_/>



MainActivity.java

package com.easybooks.myapplication;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.app.DatePickerDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
private TextView textView;
private Button button;
private String decs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = findViewById(R.id.tv);
button = findViewById(R.id.bt);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Calendar calendar = Calendar.getInstance();
DatePickerDialog dialog = new DatePickerDialog(MainActivity.this,
new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
decs = String.format("%d %d %d", year, month, dayOfMonth);
}
},
calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH),
calendar.get(Calendar.DAY_OF_MONTH));
dialog.show();
textView.setText(decs);
}
});
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("hello world");
builder.setMessage("hello world");
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
AlertDialog alter = builder.create();
alter.show();
}
}