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);
}
}
}
396LW NO topic_id
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Další témata ....(Topics)
TimerTask with updating of TextView here
//android.okhelp.cz/asynctask-example-android-with-progressbar/
//android.okhelp.cz/timer-task-timertask-run-cancel-android-example/
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/
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"
/>
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
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
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
}
Very very quick start of Android Emulator from Eclipse.
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"]
[/caption]
- 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"]

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