Shuffle Array of String Java Example
String[] sAr = new String[] {"one","two","three"};
List<String> wordList = Arrays.asList(sAr);
Collections.shuffle( wordList);
String[]myShuffledArray = wordList.toArray(new String[wordList.size()]);
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drawRect(), Paint, setStroke(), setStyle(), Canvas example source code.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
// CONSTRUCTOR
public SampleView(Context context) {
super(context);
setFocusable(true);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.CYAN);
Paint p = new Paint();
// smooths
p.setAntiAlias(true);
p.setColor(Color.RED);
p.setStyle(Paint.Style.STROKE);
p.setStrokeWidth(4.5f);
// opacity
//p.setAlpha(0x80); //
//drawRect (float left, float top, float right, float bottom, Paint paint)
canvas.drawRect(10, 10, 30, 30, p);
}
}
}
Basic shortcuts for Android Emulator.
More about Android Emulator
Emulated Device Key | Keyboard Key |
---|---|
Home | HOME |
Menu (left softkey) | F2 or Page-up button |
Star (right softkey) | Shift-F2 or Page Down |
Back | ESC |
Call/dial button | F3 |
Hangup/end call button | F4 |
Search | F5 |
Power button | F7 |
Audio volume up button | KEYPAD_PLUS, Ctrl-5 |
Audio volume down button | KEYPAD_MINUS, Ctrl-F6 |
Camera button | Ctrl-KEYPAD_5, Ctrl-F3 |
Switch to previous layout orientation (for example, portrait, landscape) | KEYPAD_7, Ctrl-F11 |
Switch to next layout orientation (for example, portrait, landscape) | KEYPAD_9, Ctrl-F12 |
Toggle cell networking on/off | F8 |
Toggle code profiling | F9 (only with -trace startup option) |
Toggle fullscreen mode | Alt-Enter |
Toggle trackball mode | F6 |
Enter trackball mode temporarily (while key is pressed) | Delete |
DPad left/up/right/down | KEYPAD_4/8/6/2 |
DPad center click | KEYPAD_5 |
Onion alpha increase/decrease | KEYPAD_MULTIPLY(*) / KEYPAD_DIVIDE(/) |
More about Android Emulator
Add and shuffle elements in LinkedList or ArrayList Java basic example.
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = {"nothing", "Hello", "people"
, "bye-bye", "hello", "world!", "End" };
List<String> arrayList = new LinkedList<String>();
for(String s: arrayOfString)
arrayList.add(s);
Collections.shuffle(arrayList);
System.out.println(arrayList);
}
}
/*
[hello, world!, bye-bye, nothing, people, End, Hello]
*/
SeekBar setOnSeekBarChangeListener Example. Change TextView font size by SeekBar Example.
TextView mTextView01 = (TextView)findViewById(R.id.textView01);
SeekBar mSeekBarTexSize = (SeekBar)findViewById(R.id.seekBarTextSize);
mSeekBarTexSize.setMax(100);
mSeekBarTexSize.setProgress(25);
mSeekBarTexSize.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
mTextView01.setTextSize((float)progress);
}
public void onStartTrackingTouch(SeekBar seekBar) {}
public void onStopTrackingTouch(SeekBar seekBar) {}
});
Map TreeMap key value pair, Map sort by key, Iterator for Map Java Android example.
MainClass.java
MainClass.java
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
public class MainClass {
public static void main(String[] arg) {
// english;germany dictionary
String[] arrayOfString = { "one;eine", "two;zwei", "three;drei", "four;vier" };
Map<String, String> map = new TreeMap<String, String>();
for(String s: arrayOfString){
String[] array = s.split(";");
String sKey ="", sValue="";
if(array.length > 1){
sKey = array[0]; sValue = array[1];
map.put(sKey, sValue);
}
}
List sortedByKeys=new ArrayList(map.keySet());
Collections.sort(sortedByKeys);
// iterate map
Set references = map.keySet();
Iterator it = references.iterator();
while (it.hasNext()) {
String key = (String) it.next();
String value = map.get(key);
System.out.println(key + " = " + value);
}
// or other example how iterate map
TreeSet<String> keys = new TreeSet<String>(map.keySet());
for (String key : keys) {
String value = map.get(key);
System.out.println(key + " = " + value);
}
// check if key exists
// if( map.containsKey("two")){
// System.out.print("two = " + map.get("two"));
// }
}
}
/*
four = vier
one = eine
three = drei
two = zwei
*/
Editace: 2013-12-09 11:04:23
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Url:shuffle-array-of-string-java-example