Create Bitmap with Linear Gradient 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.GREEN);
Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.ALPHA_8);
paint.setColor(Color.BLUE);
Shader mShader = new LinearGradient(0, 0, 100, 70, new int[] {
Color.RED, Color.GREEN, Color.BLUE },
null, Shader.TileMode.MIRROR); // CLAMP MIRROR REPEAT
Canvas c = new Canvas(b);
paint.setShader(mShader);
//c.drawCircle(60, 60, 30, paint);
c.drawRect(0, 0, 200, 200, paint);
canvas.drawBitmap(b, 10,10, paint);
}
}
}
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Další témata ....(Topics)
Terms Screen size, density, density independent pixel, resolution as a picture - pictogram.
Test your knowledge
Q: How to find out the phone screen size?
A: (By length of display diagonale in inch - Not to measure a diagonal of device!!!)
Q: What resolution has 720 x 1280 display?
A: (921600 pixels)
Q: What does it mean "240 dpi" screen density?
A: (Display have density 240 x 240 dots - "Tri-color LED etc." - per every physical (real) square inch. If you have icon 240x240 pixels, this will just occupy an area of one square inch on the display.)
Q: Phone have screen density 240 dpi. Image for 160 dpi screen density have size 128x 128 pixels. What will be the size of the image for 240 dpi screen density?
A: (Calculate the virtual pixels size. 128 * (240/160) = 192. You have to resize image to new size 192 x 192 physical pixels and put into folder drawable-hdpi (high) ~240dpi for phone with screen density 240 dpi. ) or use density independend pixels 128dp x 128dp.
Test your knowledge
Q: How to find out the phone screen size?
A: (By length of display diagonale in inch - Not to measure a diagonal of device!!!)
Q: What resolution has 720 x 1280 display?
A: (921600 pixels)
Q: What does it mean "240 dpi" screen density?
A: (Display have density 240 x 240 dots - "Tri-color LED etc." - per every physical (real) square inch. If you have icon 240x240 pixels, this will just occupy an area of one square inch on the display.)
Q: Phone have screen density 240 dpi. Image for 160 dpi screen density have size 128x 128 pixels. What will be the size of the image for 240 dpi screen density?
A: (Calculate the virtual pixels size. 128 * (240/160) = 192. You have to resize image to new size 192 x 192 physical pixels and put into folder drawable-hdpi (high) ~240dpi for phone with screen density 240 dpi. ) or use density independend pixels 128dp x 128dp.
public class Main extends Activity {
private TextView mTextView;
private Activity mAct;
private Intent mIntent;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
mTextView = findViewById(R.id.mTextView);
mAct = getActivity();
mIntent = getIntent();
}
}
to:
public class Main extends Fragment{
private TextView mTextView;
private FragmentActivity mFrgAct;
private Intent mIntent;
private LinearLayout mLinearLayout;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_main, null);
return root;
}
public void onViewCreated(View view, Bundle savedInstanceState) {
// you can add listener of elements here
/*Button mButton = (Button) view.findViewById(R.id.button);
mButton.setOnClickListener(this); */
mTextView = view.findViewById(R.id.mTextView);
mLinearLayout = (LinearLayout)view;
}
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mFrgAct = getActivity();
mIntent = mFrgAct.getIntent(); // Intent intent = new Intent(getActivity().getIntent());
}
}
boolean fc(boolean b) {
return b;
}// end fc
boolean bA = true;
boolean bB = true;
boolean bC = bA || bB; // true
bA = true;
bB = false;
bC = bA || bB; // true
bA = false;
bB = true;
bC = bA || bB; // true
bA = false;
bB = false;
bC = bA || bB; // false
if(!fc(bB||bA))
System.out.println("false"); // false
else
System.out.println("true");
Call requires API level 16 (current min is 4): android
Change The SDK version in AndroidManifest.xml to higher
Change The SDK version in AndroidManifest.xml to higher
<uses-sdk android:minSdkVersion="4" />
//
<uses-sdk android:minSdkVersion="8" />
Put extends PreferenceFragment API level 11 instead PreferenceActivity
public class SettingsActivity extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
// or insert suppresswarning
public class SettingsActivity extends PreferenceActivity {
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
Editace: 2013-12-09 13:10:18
Počet článků v kategorii: 396
Url:create-bitmap-with-linear-gradient-android-example
