Bitmap Canvas Color Gradient linear radial sweep rounded corner Android example
public class MainActivity extends Activity {
// //www.apache.org/licenses/LICENSE-2.0
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Rect mRect;
private GradientDrawable mDrawable;
public SampleView(Context context) {
super(context);
setFocusable(true);
mRect = new Rect(0, 0, 220, 120);
/* GradientDrawable.Orientation BL_TR draw the gradient from the bottom-left to the top-right
BOTTOM_TOP draw the gradient from the bottom to the top
BR_TL draw the gradient from the bottom-right to the top-left
LEFT_RIGHT draw the gradient from the left to the right
RIGHT_LEFT draw the gradient from the right to the left
TL_BR draw the gradient from the top-left to the bottom-right
TOP_BOTTOM draw the gradient from the top to the bottom
TR_BL draw the gradient from the top-right to the bottom-left
*/
mDrawable = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT,
new int[] { 0xFFFF0000, 0xFF00FF00,
0xFF0000FF });
mDrawable.setShape(GradientDrawable.RECTANGLE);
mDrawable.setGradientRadius((float)(Math.sqrt(2) * 60));
}
static void setCornerRadius(GradientDrawable drawable, float r0,
float r1, float r2, float r3) {
/* setCornerRadii
Specify radii for each of the 4 corners. For each corner,
the array contains 2 values, [X_radius, Y_radius].
The corners are ordered top-left, top-right, bottom-right,
bottom-left
*/
drawable.setCornerRadii(new float[] { r0, r0, r1, r1,
r2, r2, r3, r3 });
}
@Override protected void onDraw(Canvas canvas) {
mDrawable.setBounds(mRect);
float r = 35;
canvas.save();
canvas.translate(10, 10);
mDrawable.setGradientType(GradientDrawable.LINEAR_GRADIENT);
setCornerRadius(mDrawable, r, r, 0, 0);
mDrawable.draw(canvas);
canvas.restore();
canvas.translate(0, mRect.height() + 10);
canvas.save();
canvas.translate(10, 10);
mDrawable.setGradientType(GradientDrawable.RADIAL_GRADIENT);
setCornerRadius(mDrawable, 0, 0, r, r);
mDrawable.draw(canvas);
canvas.restore();
canvas.translate(0, mRect.height() + 10);
canvas.save();
canvas.translate(10, 10);
mDrawable.setGradientType(GradientDrawable.SWEEP_GRADIENT);
setCornerRadius(mDrawable, 0, r, r, 0);
mDrawable.draw(canvas);
canvas.restore();
}
}
}
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Další témata ....(Topics)
Try each step separately:
- Restart Eclipse
- Clean project and rebuild
- Create a new project and try it if the problem persists, if no move copy project to other folder, delete project from workspace , create new project same name and copy java, xml etc. files to new project
- Close Eclipse, backup folder c:\Users\myName\workspace\.metadata and delete it. Restart Eclipse try again import project to workspace
- Re-installing the Android Developer Tools
- Re-installing Eclipse - rename old folder with Android to Android_old, create new folder C:\Program Files\Android and copy new Eclipse with sdk into new folder
- Created a new project importing from the file system
- Created a new project from subversion
You can get list by class Build
For example:
List of Build class getting from emulator:
"BOARD=unknown
BRAND=generic
CPU_ABI=armeabi
DEVICE=generic
DISPLAY=sdk-eng 2.1-update1 ECLAIR 35983 test-keys
FINGERPRINT=generic/sdk/generic/:2.1-update1/ECLAIR/35983:eng/test-keys
HOST=android-test-13.mtv.corp.google.com
ID=ECLAIR
MANUFACTURER=unknown
MODEL=sdk
PRODUCT=sdk
TAGS=test-keys
TIME=1273161972000
TYPE=eng
USER=android-build
"
For example:
if(Build.MANUFACTURER.equals("unknown")) {
// Emulator
}
List of Build class getting from emulator:
"BOARD=unknown
BRAND=generic
CPU_ABI=armeabi
DEVICE=generic
DISPLAY=sdk-eng 2.1-update1 ECLAIR 35983 test-keys
FINGERPRINT=generic/sdk/generic/:2.1-update1/ECLAIR/35983:eng/test-keys
HOST=android-test-13.mtv.corp.google.com
ID=ECLAIR
MANUFACTURER=unknown
MODEL=sdk
PRODUCT=sdk
TAGS=test-keys
TIME=1273161972000
TYPE=eng
USER=android-build
"
do while Java example
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = { "Hello", "people", "hello", "world!" };
int i = 0;
// first cycle is always executed
do {
System.out.println("Loop: " + i);
System.out.println(arrayOfString[i]);
i++;
}while ( i == -1 );
}
}
/*
Loop: 0
Hello
*/
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = { "Hello", "people", "hello", "world!" };
int i = 0;
do {
System.out.println("Loop: " + i);
System.out.println(arrayOfString[i]);
i++;
}while ( i < arrayOfString.length );
}
}
/*
Loop: 0
Hello
Loop: 1
people
Loop: 2
hello
Loop: 3
world!
*/
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);
}
}
}
HashMap<String,Locale> _mapOfLocale = new HashMap<String,Locale>();
_mapOfLocale.put("French",Locale. FRENCH );
_mapOfLocale.put("German",Locale. GERMAN );
_mapOfLocale.put("Italian",Locale. ITALIAN );
for (Entry<String, Locale> entry : _mapOfLocale.entrySet()) {
System.out.println(entry.getKey());
System.out.println(entry.getValue());
}
Editace: 2013-12-09 13:09:03
Počet článků v kategorii: 396
Url:bitmap-canvas-color-gradient-linear-radial-sweep-rounded-corner-android-example
