Draw circle Android basic example

Canvas, drawCircle(), Paint, onDraw(), 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.drawCircle(50, 50, 30, p);
		}

	}
}

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Další témata ....(Topics)

Timer simple TimerTask Java Android example | timer-simple-timertask-java-android-example

TimerTask with updating of TextView here



package cz.okhelp.timer;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class TimerActivity extends Activity {
TextView hTextView;
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        hTextView = (TextView)findViewById(R.id.idTextView);
        MyTimerTask myTask = new MyTimerTask();
        Timer myTimer = new Timer();
//        public void schedule (TimerTask task, long delay, long period) 
//        Schedule a task for repeated fixed-delay execution after a specific delay.
//
//        Parameters
//        task  the task to schedule. 
//        delay  amount of time in milliseconds before first execution. 
//        period  amount of time in milliseconds between subsequent executions. 

        myTimer.schedule(myTask, 3000, 1500);        
        
    }
class MyTimerTask extends TimerTask {
	  public void run() {
		  // ERROR
		 hTextView.setText("Impossible");
		 // how update TextView in link below  
                 // //android.okhelp.cz/timer-task-timertask-run-cancel-android-example/
                 
	    System.out.println("");
	  }
	}


}

//android.okhelp.cz/asynctask-example-android-with-progressbar/
//android.okhelp.cz/timer-task-timertask-run-cancel-android-example/

261

Font Family change on View dynamically Android Example | font-family-change-on-view-android-example

TypeFace, setTypeface, font, font family, array of String, Button create dynamically


@Override
protected void onStart() {
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
  48,
  55
);	
Typeface typeFace = Typeface.MONOSPACE;	
String [] ar = {"A","B","C","D","E","F","G","H","J","K"};
for (int i = 0; i < ar.length; i++) {
Button buttonView = new Button(this);
buttonView.setText(Html.fromHtml("<b>"+ar[i]+"</b>"));
buttonView.setTextColor(Color.BLUE);
buttonView.setTextSize(27.f);
buttonView.setTypeface(typeFace,Typeface.BOLD);
buttonView.setOnClickListener(mThisButtonListener);
if(i%2==0)
	mLayoutButtons.addView(buttonView, p);
else
	mLayoutButtonsNextRow.addView(buttonView, p);
	
_listOfButtons.add(buttonView);
}

	super.onStart();
}

//////// xml file
<TextView
    android:id="@+id/text01"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="20dp"
    android:fontFamily="Arial"
 />

180

Motorola Droid X | motorola-droid-x

Motorola Droid X cena od 3 000 KCZ Kč (únor.2012)
Spokojenost uživatelů nadprůměrná.
Motorola Droid X je chytrý telefon s operačním systémem Android.
Motorola Droid X je (22.února2012) 8. nejpoužívanějším chytrým telefonem u programu Sky Map viz tabulka.

Android 2.1
Display 854 x 480 pixelů
8 megapixel fotoaparát dual LED flash
720p HD video recording
Music and Video player
8 GB paměť
rozšíření paměti 32 GB
WiFi/DLNA
TI OMAP3630 processor – 1GHz
4.3-inch large display

Motorola Droid X photo pic image

Zdroj obrázku: wikipedia

107

Memory usage of application in Android sample code | memory-usage-of-application-in-android-sample-code


public class MainClass extends Activity {
ActivityManager activityManager; 
MemoryInfo memoryInfo; 
final String TAG = "MemInfo";


@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

         activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
         memoryInfo = new ActivityManager.MemoryInfo();

        activityManager.getMemoryInfo(memoryInfo);
 
    	           Log.i(TAG, " memoryInfo.availMem " + memoryInfo.availMem);
    	           Log.i(TAG, " memoryInfo.lowMemory " + memoryInfo.lowMemory);
    	           Log.i(TAG, " memoryInfo.threshold " + memoryInfo.threshold);

  Toast.makeText(getApplicationContext(),  String.valueOf( memoryInfo.availMem), Toast.LENGTH_LONG)
		.show();

    } // end onCreate
}

How to make a quick start the android emulator | how-to-make-a-quick-start-the-android-emulator

Very very quick start of Android Emulator from Eclipse.

Go to Eclipse s menu Window -> Android SDK and AVD Manager

Select Virtual devices

Select check box Snapshot: Enabled

Press Edit AVD button.

If will closed Android Emulator all data will saved on disk.
If will reopen Android Emulator, configuration and data will read from disk.

[caption id="attachment_768" align="alignleft" width="300" caption="android-emulator-enable-quick-start"]

android/android-emulator-quick-start-300x247.png

[/caption]

Editace: 2013-12-09 13:11:26
Počet článků v kategorii: 396
Url:draw-circle-android-basic-example