使用出生日期计算年龄
问题描述：
我正在开发一个Android应用程序，以查找从用户提供的出生日期的年龄。三个编辑文本有一个为一天，另外两个月和年。我得到了这个链接的代码..但是我不知道下一步该怎么做...我给代码远远我创建了...请检查并帮助我...
I am developing an android app to find the age from the date of birth provided by user.. three edit-texts are there one for day and other two for month and year. I got the code from this link.. But I dont know what to do next... I am giving the code so far I created... pls check and help me...
main_activity.xml
<RelativeLayout 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"
tools:context=".MainActivity" >
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="32dp"
android:layout_marginTop="42dp"
android:ems="10"
android:inputType="date" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/editText1"
android:layout_below="@+id/editText1"
android:layout_marginTop="30dp"
android:ems="10"
android:inputType="date" />
<EditText
android:id="@+id/editText3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/editText2"
android:layout_below="@+id/editText2"
android:layout_marginTop="24dp"
android:ems="10"
android:inputType="date" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText3"
android:layout_centerHorizontal="true"
android:layout_marginTop="82dp"
android:onClick="getAge"
android:text="Button" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="54dp"
android:text="TextView" />
</RelativeLayout>
MainActivity.java
public class MainActivity extends Activity {
long a =0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
EditText et1 = (EditText) findViewById (R.id.editText1);
EditText et2 = (EditText) findViewById (R.id.editText2);
EditText et3 = (EditText) findViewById (R.id.editText3);
Button btn1 = (Button) findViewById (R.id.button1) ;
TextView tv1 = (TextView) findViewById (R.id.textView1);
}
public int getAge (int _year, int _month, int _day) {
GregorianCalendar cal = new GregorianCalendar();
int y, m, d, a;
y = cal.get(Calendar.YEAR);
m = cal.get(Calendar.MONTH);
d = cal.get(Calendar.DAY_OF_MONTH);
cal.set(_year, _month, _day);
a = y - cal.get(Calendar.YEAR);
if ((m < cal.get(Calendar.MONTH))
|| ((m == cal.get(Calendar.MONTH)) && (d < cal
.get(Calendar.DAY_OF_MONTH)))) {
--a;
}
if(a < 0)
throw new IllegalArgumentException("Age < 0");
return a;
}
}
答
您应该在按钮中添加一个点击监听器，然后在其中添加一个点击监听器，计算年龄，并在TextView中显示。
You should add a click listener to your button, then in it, calculate the age and display it in your TextView.
public class MainActivity extends Activity {
long a =0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText et1 = (EditText) findViewById (R.id.editText1);
final EditText et2 = (EditText) findViewById (R.id.editText2);
final EditText et3 = (EditText) findViewById (R.id.editText3);
Button btn1 = (Button) findViewById (R.id.button1) ;
final TextView tv1 = (TextView) findViewById (R.id.textView1);
btn1.setOnClickListener(new OnClickListener{
@Override
public void onClick (View v){
int day = Integer.parseInt(et1.getText().toString());
int month = Integer.parseInt(et2.getText().toString());
int year = Integer.parseInt(et3.getText().toString());
tv1.setText(String.valueOf(MainActivity.this.getAge(year, month, day)));
}
});
}
public int getAge (int _year, int _month, int _day) {
GregorianCalendar cal = new GregorianCalendar();
int y, m, d, a;
y = cal.get(Calendar.YEAR);
m = cal.get(Calendar.MONTH);
d = cal.get(Calendar.DAY_OF_MONTH);
cal.set(_year, _month, _day);
a = y - cal.get(Calendar.YEAR);
if ((m < cal.get(Calendar.MONTH))
|| ((m == cal.get(Calendar.MONTH)) && (d < cal
.get(Calendar.DAY_OF_MONTH)))) {
--a;
}
if(a < 0)
throw new IllegalArgumentException("Age < 0");
return a;
}
}