Okhelp.cz

Recepty, články, nápady, programování. Dříve dum-zahrada, finance, internet a know-how.okhelp.cz Pro lepší výsledky hledání používejte i diakritiku.

Draw Oval Android basic example


AD MOB

drawOval(), setStrokeWidth(), setStyle()


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) {

			canvas.drawColor(Color.CYAN);
			Paint p = new Paint();
			// smooths
			p.setAntiAlias(true);
			p.setColor(Color.RED);
			p.setStyle(Paint.Style.STROKE); 
			p.setStrokeWidth(4.5f);
			// opacity
			//p.setAlpha(0x80); //
 
			canvas.drawOval(new RectF(50, 50, 20, 40), p);;
		}

	}
}

397LW NO topic_id




AD

Další témata ....(Topics)


29

ListView add item click item basic Android example code | listview-add-item-click-item-basic-android-example-code


Definition of ListView in layout main.xml file Android example



<ListView android:id="@+id/idListView"
        android:background="#7700CC00"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent" /> 



Code in Main.java ListView example source code Java Android

public class Main extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ListView mlistView = (ListView) findViewById(R.id.idListView);
        mlistView.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, 
                new String[] {"Game", "Help", "Home site"}));
    
        mlistView.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
              // When clicked, show a toast with the TextView text Game, Help, Home
              Toast.makeText(getApplicationContext(), ((TextView) view).getText(),
                  Toast.LENGTH_SHORT).show();
            }
          });
     }
}


216

Java pass variable as reference | java-pass-variable-as-reference


Integer, Float, String, List passed as reference in JAVA example source code:

// List passed as reference JAVA
List<Integer>list = new ArrayList<Integer>();

public void fc (List<Integer>listRef){
listRef.add(7);
listRef.add(5);
}
fc(list); // 7, 5 


// String passed as reference JAVA
	public void mutate(AtomicReference<Object> ref) { ref.set("Goodbye"); }

		AtomicReference<Object> ref = new AtomicReference<Object>("Hello");
		mutate(ref);
		System.out.println(ref.get()); //Goodbye!
             String s = (String) ref.get();


// Integer passed as reference JAVA
	private static void mutate(AtomicReference<Object> ref) { ref.set(7); }

	//public static void main(String[] arg) {
		AtomicReference<Object> ref = new AtomicReference<Object>(5);
		mutate(ref);
		System.out.println(ref.get()); // 7
int n = (Integer) ref.get();


// Float passed as reference JAVA
	private static void mutate(AtomicReference<Object> ref) { ref.set(14.8f); }

	//public static void main(String[] arg) {
		AtomicReference<Object> ref = new AtomicReference<Object>(12.1f);
		mutate(ref);
		float f = (Float) ref.get();
		System.out.println(f); //14.8

3

Download file from URL | download-file-from-url


Download image file from URL to ImageView Java Android source example code.



Context context = thisClass.this;
Drawable image = ImageOperations(context,
"//www.okhelp.cz/images/android/ad_4.png"
,"image.jpg");
ImageView imgView;
imgView = (ImageView)findViewById(R.id.idImageView);
imgView.setImageDrawable(image);

	private Drawable ImageOperations(Context ctx, String url, String saveFilename) {
		try {
			InputStream is = (InputStream) this.fetch(url);
			Drawable d = Drawable.createFromStream(is, "src");
			return d;
		} catch (MalformedURLException e) {
			e.printStackTrace();
			return null;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	public Object fetch(String address) throws MalformedURLException,IOException {
		URL url = new URL(address);
		Object content = url.getContent();
		return content;
	}
43

No title bar Android application without titlebar style Theme NoTitleBar Android example | no-title-bar-android-application-without-titlebar-style-theme-notitlebar-android-example


Set in AndroidManifest.xml android:theme="@android:style/Theme.NoTitleBar" AndroidManifest.xml example source code.
AndroidManifest.xml


<manifest xmlns:android="//schemas.android.com/apk/res/android"
    package="com.myexample.without_titlebar">
    <application android:label="My app">
      <activity android:name="NoTitleBar"
        android:theme="@android:style/Theme.NoTitleBar"
        android:screenOrientation="portrait"
        android:configChanges="keyboardHidden|orientation">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

0

EditText text changed java Android | edittext-text-changed


Google Android example source code - is text changed in EditText ?

EditText hEditText;

// TextChanged in onCreate
hEditText = (EditText)findViewById(R.id.idEditText);
hEditText.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable str) {
}

public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}

public void onTextChanged(CharSequence sq, int start, int before,
int count) {
}
});


Editace: 2013-12-09 13:11:12
Počet článků v kategorii: 397
Url:draw-oval-android-basic-example

AD
11 Share
Share
Tweet