How get bitmap dimension without loading Android example
Bitmap Width, Height without memory allocation:
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(getResources(), R.id.myimage, options);
// now opts.outWidth and opts.outHeight are the dimension of the
// bitmap, even though Bitmap is null
int imageHeight = options.outHeight;
int imageWidth = options.outWidth;
String imageType = options.outMimeType;
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RectF, drawRoundRect(),
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.GREEN);
Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.ALPHA_8);
Canvas c = new Canvas(b);
RectF rectF = new RectF();
rectF.set(5,5,150,150);
c.drawRoundRect(rectF, 10, 10, paint);
paint.setColor(Color.RED);
canvas.drawBitmap(b, 10,10, paint);
}
}
}
Toast in Android application is equivalent of Alert in JavaScript or MessageBox in WinApi.
// Toast android.widget.Toast.makeText(Context context, CharSequence text, int duration)
// public static Toast makeText (Context context, CharSequence text, int duration)
Toast.makeText(getApplicationContext(), "Hello world!",
Toast.LENGTH_SHORT).show();
How install Android emulator on PC
//developer.android.com/sdk/installing.html
Download links:
Java Development Kit JDK download
Eclipse download
Android SDK download
//developer.android.com/sdk/installing.html
Download links:
Java Development Kit JDK download
Eclipse download
Android SDK download