int java android example
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int occupy 4 bytes (32 bits) in memory
int in Java example of using Integer and Array of Integer and Iteger to String
int in Java example of using Integer and Array of Integer and Iteger to String
// get max end min values of int in Java example 4 bytes (32 bits) PC architecture
System.out.println(Integer.MAX_VALUE); // 2147483647
System.out.println(Integer.MIN_VALUE); // -2147483648
// members variable
private int mProgress = 10;
//integer to string java
int myInteger = 8;
String myString = Integer.toString(myInteger);
// a final variable can only be initialized once
static final int NUM_PARTICLES = 15;
for (int i = 0; i < NUM_PARTICLES ; i++) {
// do something
}
// int as return value of function
public int getCount() {
return 5;
}
// int as a parametr of function
public float getFloatFromInt(int i) {
float fRet = (float) i;
return fRet;
}
//array of int
int[] anArray; // declares an array of integers
anArray = new int[2]; // allocates memory for 2 integers
anArray[0] = 100; // initialize first element
anArray[1] = 200; // initialize second element
for (int i = 0; i < anArray.length; i++) {
// print out values from anArray
System.out.println("Index: " + i);
System.out.println("Value: " + anArray[i]);
}
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Další témata ....(Topics)
If you want save battery, select "Satelite map" from map menu and reduce the brightness of the display.
If you have trouble with compilation of new project after you make a update of android development tools you can go back to old version of the tools.
-
- Open Help > About Eclipse... use the menu > About...
- Click the "Installation Details" button.
- Select the "Installation History" tab.
- Select one of the previous configurations.
- Click the "Revert" button at the bottom.
choreographer skipped frames
Create filter with TAG regex to disable Choreographer messages, see code and picture below:
Create filter with TAG regex to disable Choreographer messages, see code and picture below:
^((?!Choreographer).)*$
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);
}
}
}
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
paint.setFilterBitmap(true);
Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.flower_blue);
canvas.drawBitmap(bitmapOrg, 10, 10, paint);
int width, height;
Canvas c = new Canvas(b);
paint.setAlpha(255); //0x80
c.translate(0, 30);
c.drawBitmap(bitmapOrg, new Matrix(), paint);
paint.setColor(Color.BLUE);
Path mPath = new Path();
mPath.addCircle(50, 50, 50, Path.Direction.CCW);
//c.clipPath(mPath, Region.Op.UNION);
//c.clipPath(mPath, Region.Op.DIFFERENCE);
c.clipPath(mPath, Region.Op.INTERSECT);
//c.clipPath(mPath, Region.Op.REPLACE);
//c.clipPath(mPath, Region.Op.XOR);
paint.setColor(Color.GREEN);
paint.setAntiAlias(true);
c.drawCircle(30, 20, 30, paint);
int h = bitmapOrg.getHeight();
//canvas.drawBitmap(bitmapOrg, 10, 10, paint);
canvas.drawBitmap(b, 0, 10 + h + 10, paint);
}
}
}
Editace: 2011-09-26 20:51:00
Počet článků v kategorii: 397
Url:int-java-android-example
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