long in java example
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Android development
long is 64 bit signed type and used when int is not large enough to hold the value.
long je celé číslo 64 bitů -9223372036854775808 +9223372036854775807 a používá se tam, kde typ int není schopen pojmout takovou hodnotu čísla.
long is 64 bit signed type and used when int is not large enough to hold the value.
long je celé číslo 64 bitů -9223372036854775808 +9223372036854775807 a používá se tam, kde typ int není schopen pojmout takovou hodnotu čísla.
// declaration and assignment of value type long
long n = 22337203685477580L;
// print formated value
System.out.printf("The value of x is %d%n", n); // 22337203685477580
System.out.format("%+,8d%n%n", n); // +22 337 203 685 477 580
// declaring more variables in single statement
long lo1 = 12L, lo2 = 56, lo3 = 1455555555589L;
// long range of value
System.out.println(Long.MAX_VALUE); // 9223372036854775807
System.out.println(Long.MIN_VALUE); // -9223372036854775808
// check if a string is a valid number in Java example
// convert string to long Java example
String sLong = "1288888888888888";
long longParse = Long.parseLong(sLong);
// convert strings to numbers
long longFromString = (Long.valueOf(sLong)).longValue();
// long to string in Java example code
Long longObj = new Long(229999999999L);
String str = longObj.toString();
// else
Long longS = 888888888888L;
String strLong = longS.toString();
// compare two long variables
Long longComp1 = 5555L;
if (longComp1.equals(55555555L))
System.out.print("true");
// compares the two specified long values in Java example
int i = longS.compareTo(444444L); // -1 first < second
// 0 first == second
// 1 first > second
System.out.print(i);
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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>
If you create a button or view programmatically with OnClickListener you can set a tag key before button in parent layout is added.
And get correct button by this tag getTag() instead getId() in OnClickListener etc.
And get correct button by this tag getTag() instead getId() in OnClickListener etc.
Button button = new Button(getApplicationContext());
int idOfButton = button.getId(); // return -1
button.setTag("my_button");
String sTag = (String) button.getTag(); // return "my_button"
MainActivity.java
res/layout/main.xml
res/drawable/my_progress.xml
ProgressBar mProgressBarScore;
// onCreate
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Resources res = getResources();
mProgressBarScore.setProgressDrawable(res.getDrawable( R.drawable.my_progress));
res/layout/main.xml
<ProgressBar
android:id="@+id/progressBarScore"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content" android:max="100"/>
res/drawable/my_progress.xml
-
android:centerColor="#ff5a5d5a"
android:centerY="0.75"
android:endColor="#FF001A"
android:angle="270"
/>
-
android:centerColor="#80ffb600"
android:centerY="0.75"
android:endColor="#a0ffcb00"
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/>
>
android:centerColor="#80ffb600"
android:centerY="0.75"
android:endColor="#339900"
android:angle="270" />
If a button have focus, marquee will run.
Important:
android:singleLine="true"
android:ellipsize="marquee"
Optional:
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Important:
android:singleLine="true"
android:ellipsize="marquee"
Optional:
android:marqueeRepeatLimit="1"
// main.xml
<Button
android:layout_width="150dip"
android:layout_height="wrap_content"
android:text="My button with a long text for marquee as a example source code"
android:singleLine="true"
android:ellipsize="marquee"
android:marqueeRepeatLimit="1"/>
Editace: 2011-09-26 20:49:35
Počet článků v kategorii: 397
Url:long-in-java-example
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