SparseArray instead HashMap Android example
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
396LW NO topic_id
AD
Další témata ....(Topics)
Drawable dr = getResources().getDrawable(R.drawable.algebra);
int h = dr.getIntrinsicHeight();
int w = dr.getIntrinsicWidth();
Bitmap ball = BitmapFactory.decodeResource(getResources(), R.drawable.algebra);
int _nWidth = ball.getWidth();
int _nHeight = ball.getHeight();
Rotate a bitmap Android source code.

public class MainActivity extends Activity {
@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) {
Paint paint = new Paint();
canvas.drawColor(Color.YELLOW);
// Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888);
// you need to insert a image flower_blue into res/drawable folder
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.flower_blue);
Matrix mat = new Matrix();
mat.postRotate(90);
Bitmap bmpRotate = Bitmap.createBitmap(bmp, 0, 0,
bmp.getWidth(), bmp.getHeight(),
mat, true);
int h = bmp.getHeight();
canvas.drawBitmap(bmp, 10,10, paint);
canvas.drawBitmap(bmpRotate, 10,10 + h + 10, paint);
}
}
}

Show keyboard if WebView input have focus Android apps development example source code.
WebView webview;
//in onCreate
webview = (WebView) findViewById(R.id.idWebviewPda);
webview.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("//android.okhelp.cz");
webview.requestFocus(View.FOCUS_DOWN);
webview.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_UP:
if (!v.hasFocus()) {
v.requestFocus();
}
break;
}
return false;
}
});
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
- create div with class with name e.g. circle
- create in styleSheet.css class circle
html code
<div class="circle" id="">3</div>
css code
.circle {
border-radius: 50%;
width: 50px;
height: 50px;
background: yellow;
position: absolute;
display: block;
border: 6px solid blue;
font-size: 50px;
text-align: center;
}
3
Editace: 2013-12-09 13:04:15
Počet článků v kategorii: 396
Url:sparsearray-instead-hashmap-android-example