Convert a Bitmap to Gray Scale Android example
Black and white bitmap image pictures, gray scale colormatrix 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);
canvas.drawBitmap(bitmapOrg, 10, 10, paint);
int width, height;
ColorMatrix cm = new ColorMatrix(
new float[]{
0.5f,0.5f,0.5f,0,0,
0.5f,0.5f,0.5f,0,0,
0.5f,0.5f,0.5f,0,0,
0,0,0,1,0,0,
0,0,0,0,1,0
});
cm.setSaturation(0);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
paint.setColorFilter(f);
int h = bitmapOrg.getHeight();
//canvas.drawBitmap(bitmapOrg, 10, 10, paint);
canvas.drawBitmap(bitmapOrg, 10, 10 + h + 10, paint);
}
}
}

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Switch statement with numbers and array of strings Java example.
Possible:
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = { "One", "Two", "Three", "Four" };
int i = 2;
switch (i) {
case 1: {
System.out.println(arrayOfString[i]);
break;
}
case 2: {
System.out.println(arrayOfString[i]);
break;
}
case 3: {
System.out.println(arrayOfString[i]);
break;
}
default: {
System.out.println("Enter a valid value.");
}
} // END of switch
}
}
/*
* Three
*/
Possible:
case 1:
System.out.println(arrayOfString[i]);
break;
// i love this notation
case 1:{
System.out.println(arrayOfString[i]);
}break;
case 1:{
System.out.println(arrayOfString[i]);
break;
}
Map TreeMap key value pair, Map sort by key, Iterator for Map Java Android example.
MainClass.java
MainClass.java
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
public class MainClass {
public static void main(String[] arg) {
// english;germany dictionary
String[] arrayOfString = { "one;eine", "two;zwei", "three;drei", "four;vier" };
Map<String, String> map = new TreeMap<String, String>();
for(String s: arrayOfString){
String[] array = s.split(";");
String sKey ="", sValue="";
if(array.length > 1){
sKey = array[0]; sValue = array[1];
map.put(sKey, sValue);
}
}
List sortedByKeys=new ArrayList(map.keySet());
Collections.sort(sortedByKeys);
// iterate map
Set references = map.keySet();
Iterator it = references.iterator();
while (it.hasNext()) {
String key = (String) it.next();
String value = map.get(key);
System.out.println(key + " = " + value);
}
// or other example how iterate map
TreeSet<String> keys = new TreeSet<String>(map.keySet());
for (String key : keys) {
String value = map.get(key);
System.out.println(key + " = " + value);
}
// check if key exists
// if( map.containsKey("two")){
// System.out.print("two = " + map.get("two"));
// }
}
}
/*
four = vier
one = eine
three = drei
two = zwei
*/
Start Stop Stopwatch Timer Android example source code.
private static long mStartTime = 0L;
Calendar cal;
TextView hTextViewVypis = (TextView)findViewById(R.id.idTextVypis);
void start(){
cal = Calendar.getInstance();
mStartTime = cal.getTimeInMillis();
}
void stop(){
prinOutStopWatchTime();
}
private void prinOutStopWatchTime() {
final long start = mStartTime;
cal = Calendar.getInstance();
long stopTime = cal.getTimeInMillis();
long millis = stopTime - start;
long milisekundy = millis % 1000;
int seconds = (int) (millis / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
int hour = minutes / 60;
hour = hour % 60;
if (seconds < 10) {
hTextViewVypis.setText(hour + ":" + minutes + ":0" + seconds + ":" + milisekundy);
} else {
hTextViewVypis.setText(hour + ":" + minutes + ":" + seconds + ":" + milisekundy);
}
}
Try two way in Eclipse IDE:
1.) Import the library project into your Eclipse workspace.
Click File > Import,
select Android > Existing Android Code into Workspace, and browse to the copy of the library project to import it.
If project not visible with checkbox try next step as see below.
2.) Click
File > New > Other
select Android > Existing Android Code into Workspace, and browse to the copy of the library project to import it.
1.) Import the library project into your Eclipse workspace.
Click File > Import,
select Android > Existing Android Code into Workspace, and browse to the copy of the library project to import it.
If project not visible with checkbox try next step as see below.
2.) Click
File > New > Other
select Android > Existing Android Code into Workspace, and browse to the copy of the library project to import it.
Try some solution - each individually or all
- Check AndroidManifest.xml activity declaration
<activity android:name=".EnableProfileActivity" android:label="@string/app_name" />
- Delete BUILD folder in module tree and Clean / Rebuild project
- Restart Android Studio
Editace: 2013-12-09 13:09:13
Počet článků v kategorii: 396
Url:convert-a-bitmap-to-gray-scale-android-example