Switch Statement Java basic example
Switch statement with numbers and array of strings Java example.
Possible:
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = { "One", "Two", "Three", "Four" };
int i = 2;
switch (i) {
case 1: {
System.out.println(arrayOfString[i]);
break;
}
case 2: {
System.out.println(arrayOfString[i]);
break;
}
case 3: {
System.out.println(arrayOfString[i]);
break;
}
default: {
System.out.println("Enter a valid value.");
}
} // END of switch
}
}
/*
* Three
*/
Possible:
case 1:
System.out.println(arrayOfString[i]);
break;
// i love this notation
case 1:{
System.out.println(arrayOfString[i]);
}break;
case 1:{
System.out.println(arrayOfString[i]);
break;
}
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break statement in Java Android basic example
MainClass.java
MainClass.java
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = {"nothing", "Hello", "people"
, "bye-bye", "hello", "world!", "end" };
for (int i = 0; i < arrayOfString.length; i++) {
System.out.println(arrayOfString[i]);
if(i > 2)
break; // end of loop
}
}
}
/*
nothing
Hello
people
bye-bye
*/
How to resize an image in ImageView Android source code.
Resize imageview layout and image will resize too:
Resize imageview layout and image will resize too:
public void resizeImageView(int width, int height) {
final ImageView picture1 = (ImageView)findViewById(R.id.imageView1);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(width, height);
picture1.setLayoutParams(layoutParams);
}
Old code with HashMap
Lint warning:
Use new SparseArray(...) instead for better performance
Issue: Looks for opportunities to replace HashMaps with the more efficient SparseArray
Id: UseSparseArrays
New code with SparseArray
SparseArray methods:
//developer.android.com/reference/android/util/SparseArray.html
Map<Integer, Bitmap> _bitmapCache = new HashMap<Integer, Bitmap>();
private void fillBitmapCache() {
_bitmapCache.put(R.drawable.icon, BitmapFactory.decodeResource(getResources(), R.drawable.icon));
_bitmapCache.put(R.drawable.abstrakt, BitmapFactory.decodeResource(getResources(), R.drawable.abstrakt));
_bitmapCache.put(R.drawable.wallpaper, BitmapFactory.decodeResource(getResources(), R.drawable.wallpaper));
_bitmapCache.put(R.drawable.scissors, BitmapFactory.decodeResource(getResources(),
}
Bitmap bm = _bitmapCache.get(R.drawable.icon);
Lint warning:
Use new SparseArray
Issue: Looks for opportunities to replace HashMaps with the more efficient SparseArray
Id: UseSparseArrays
New code with SparseArray
SparseArray<Bitmap> _bitmapCache = new SparseArray<Bitmap>();
private void fillBitmapCache() {
_bitmapCache.put(R.drawable.icon, BitmapFactory.decodeResource(getResources(), R.drawable.icon));
_bitmapCache.put(R.drawable.abstrakt, BitmapFactory.decodeResource(getResources(), R.drawable.abstrakt));
_bitmapCache.put(R.drawable.wallpaper, BitmapFactory.decodeResource(getResources(), R.drawable.wallpaper));
_bitmapCache.put(R.drawable.scissors, BitmapFactory.decodeResource(getResources(),
}
Bitmap bm = _bitmapCache.get(R.drawable.icon);
SparseArray methods:
//developer.android.com/reference/android/util/SparseArray.html
String s = "AbcČ";
String s2 = s.toLowerCase(new Locale("cs_CZ")); // Czech Republic
String s3 = s.toLowerCase(new Locale("de_DE")); // Germany
//
en_US
en_GB
ar_EG
be_BY
bg_BG
ca_ES
cs_CZ
da_DK
de_DE
Problem:
You have two class with similar names HeadLinesFragment and HeadMyLinesFragment with OnHeadlineSelectedListener.
Check if call correct class in MainActivity.
For example if use HeadMyLinesFragment change implement to HeadMyLinesFragment too!
You have two class with similar names HeadLinesFragment and HeadMyLinesFragment with OnHeadlineSelectedListener.
Check if call correct class in MainActivity.
For example if use HeadMyLinesFragment change implement to HeadMyLinesFragment too!
public class MainActivity extends FragmentActivity
implements HeadLinesFragment.OnHeadlineSelectedListener {
// wrong implements you need correct class name
//implements HeadMyLinesFragment.OnHeadlineSelectedListener
//............
HeadMyLinesFragment firstFragment = new HeadMyLinesFragment(); // because in code using HeadMyLinesFragment
Editace: 2011-10-05 08:01:22
Počet článků v kategorii: 396
Url:switch-statement-java-basic-example
