Shuffle Array of String Java Example
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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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Další témata ....(Topics)
int[] mArrayOfInt;
String[] mArrayOfString;
List<String> mList;
public void saveState(Bundle map)
{
map.putIntArray("mArrayOfInt", mArrayOfInt);
map.putStringArray("mArrayOfString", mArrayOfString);
map.putStringArrayList("mList", mList);
}
public void restoreState(Bundle map)
{
mArrayOfInt= map.getIntArray("mArrayOfInt");
mArrayOfString = map.getStringArray("mArrayOfString");
mList = map.getStringArrayList("mList");
}
Google Android example source code - is text changed in EditText ?
EditText hEditText;
// TextChanged in onCreate
hEditText = (EditText)findViewById(R.id.idEditText);
hEditText.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable str) {
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void onTextChanged(CharSequence sq, int start, int before,
int count) {
}
});Put extends PreferenceFragment API level 11 instead PreferenceActivity
public class SettingsActivity extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
// or insert suppresswarning
public class SettingsActivity extends PreferenceActivity {
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
Terms Screen size, density, density independent pixel, resolution as a picture - pictogram.
Test your knowledge
Q: How to find out the phone screen size?
A: (By length of display diagonale in inch - Not to measure a diagonal of device!!!)
Q: What resolution has 720 x 1280 display?
A: (921600 pixels)
Q: What does it mean "240 dpi" screen density?
A: (Display have density 240 x 240 dots - "Tri-color LED etc." - per every physical (real) square inch. If you have icon 240x240 pixels, this will just occupy an area of one square inch on the display.)
Q: Phone have screen density 240 dpi. Image for 160 dpi screen density have size 128x 128 pixels. What will be the size of the image for 240 dpi screen density?
A: (Calculate the virtual pixels size. 128 * (240/160) = 192. You have to resize image to new size 192 x 192 physical pixels and put into folder drawable-hdpi (high) ~240dpi for phone with screen density 240 dpi. ) or use density independend pixels 128dp x 128dp.
Test your knowledge
Q: How to find out the phone screen size?
A: (By length of display diagonale in inch - Not to measure a diagonal of device!!!)
Q: What resolution has 720 x 1280 display?
A: (921600 pixels)
Q: What does it mean "240 dpi" screen density?
A: (Display have density 240 x 240 dots - "Tri-color LED etc." - per every physical (real) square inch. If you have icon 240x240 pixels, this will just occupy an area of one square inch on the display.)
Q: Phone have screen density 240 dpi. Image for 160 dpi screen density have size 128x 128 pixels. What will be the size of the image for 240 dpi screen density?
A: (Calculate the virtual pixels size. 128 * (240/160) = 192. You have to resize image to new size 192 x 192 physical pixels and put into folder drawable-hdpi (high) ~240dpi for phone with screen density 240 dpi. ) or use density independend pixels 128dp x 128dp.
If a button have focus, marquee will run.
Important:
android:singleLine="true"
android:ellipsize="marquee"
Optional:
android:marqueeRepeatLimit="1"
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: 2013-12-09 11:04:23
Počet článků v kategorii: 397
Url:shuffle-array-of-string-java-example
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