Difference between “@+id/” and “@id/” in Android
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Difference between "@+id/” and "@id/” in Android
android:id="@+id/xxx" unique identifier of view
@id/ a reference to the unique identifier
android:id="@+id/xxx" unique identifier of view
@id/ a reference to the unique identifier
<TextView
android:id="@+id/first_element_id"
.........
/>
<TextView
android:id="@+id/second_element_id"
android:layout_below="@id/first_element_id"
..........
/>
397LW NO topic_id
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GregorianCalendar cal = new GregorianCalendar(); Boolean b = cal.isLeapYear(2012); // true, Android example.
public class MainActivity extends Activity {
TextView txtV;
Context cntx;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtV = (TextView)findViewById(R.id.idLabel);
cntx = this;
StringBuilder strBuild = new StringBuilder();
GregorianCalendar cal = new GregorianCalendar();
Boolean b = cal.isLeapYear(2012); // true
strBuild.append("Is leap year 2012? " + b + "
");
b = cal.isLeapYear(2014); // false
strBuild.append("Is leap year 2014? " + b + "
");
txtV.setText(strBuild);
}
}
Delete - unistal app from testing device - emulator and try again RUN - DEBUGG your app.
- File->Project Structure Ctrl + Alt + Shift + S
- Select module and Dependencies Tab
- Click on + PLUS button (right upper corner)
- Select library
Click OK, OK
Date difference in millisecond between two date, GregorianCalendar, Calendar, after(), befor(), getTimeInMillis().
public class HoriziontalScrollActivity extends Activity {
TextView txtV;
Context cntx;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtV = (TextView)findViewById(R.id.idLabel);
cntx = this;
StringBuilder strBuild = new StringBuilder();
Calendar firstDate = new GregorianCalendar(2011, Calendar.DECEMBER, 31);
Calendar secondDate = new GregorianCalendar(2012, Calendar.JANUARY, 1);
Boolean bDetermine = firstDate.after(secondDate); // false
strBuild.append("Is firsDate after secondDate? " + bDetermine + "
");
bDetermine = firstDate.before(secondDate); // true
strBuild.append("Is firsDate before secondDate? " + bDetermine + "
");
long differenceInMillisecond = 0L;
differenceInMillisecond = secondDate.getTimeInMillis()-firstDate.getTimeInMillis();
// second == 1000 millisecond
long second = differenceInMillisecond / 1000L;
strBuild.append("Difference between two dates is: " + second + "
");
txtV.setText(strBuild);
}
}
Full Screen without titlebar and statusbar for Android Activity.
In Activity.java
or in AndroidManifest.xml
In Activity.java
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
}
or in AndroidManifest.xml
<activity android:name=".ActivityName"
android:label="@string/app_name"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
</activity>
Editace: 2015-12-01 11:31:06
Počet článků v kategorii: 397
Url:difference-between-id-and-id-in-android
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