Draw drawARGB() Android basic example
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) {
//drawARGB (int a, int r, int g, int b)
// a alpha component (0..255) of the color to draw onto the canvas
// r red component (0..255)
// g green component (0..255)
// b blue component (0..255)
canvas.drawARGB(255, 0, 255, 10);
}
}
}
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Další témata ....(Topics)
Cut, shear, clip, snip, crop a bitmap, picture, image Android example
public class ApokusActivity 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);
// you need to insert a image flower_blue into res/drawable folder
paint.setFilterBitmap(true);
Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.flower_blue);
Bitmap croppedBmp = Bitmap.createBitmap(bitmapOrg, 0, 0,
bitmapOrg.getWidth() / 2, bitmapOrg.getHeight());
int h = bitmapOrg.getHeight();
canvas.drawBitmap(bitmapOrg, 10, 10, paint);
canvas.drawBitmap(croppedBmp, 10, 10 + h + 10, paint);
}
}
}
int nf = Math.round(5.789f);
System.out.print(nf); // 6
float f = 28.611f;
int n3 = Math.round(f);
System.out.println(n3); // 29
double d = 1234.56;
long lon = Math.round(d);
System.out.println(lon); // 1235
int diff = 90 - 40;
// float fDeleni = diff / 10; // error code
float fDeleni = (float)diff / 10.f; // ok
int nRound = Math.round(fDeleni);
// Caution:
int n2 = (int) 8.999f;
System.out.println(n2); // 8
Failed to rename directory ....
If using for update Android SDK manager,
try close Eclipse if is open.
Or change security settings of the folder which have problem.
Or disable antivirus for a moment.
If using for update Android SDK manager,
try close Eclipse if is open.
Or change security settings of the folder which have problem.
Or disable antivirus for a moment.
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
Button, setOnClickListener, Intent.ACTION_VIEW, startActivity Android example.
Button mIdButtonHome = (Button)findViewById(R.id.idButtonHome);
mIdButtonHome.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent browserIntent = new Intent(
Intent.ACTION_VIEW,
Uri.parse("//android.okhelp.cz/category/software/"));
startActivity(browserIntent);
}
});
Editace: 2013-12-09 13:10:51
Počet článků v kategorii: 396
Url:draw-drawargb-android-basic-example