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)
Get assets folder files to array of strings.
Its show files in assets folder and sub folders:
Its show files in assets folder and sub folders:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final AssetManager assetManager = getAssets();
try {
// for assets folder add empty string
String[] filelist = assetManager.list("");
// for assets/subFolderInAssets add only subfolder name
String[] filelistInSubfolder = assetManager.list("subFolderInAssets");
if (filelist == null) {
// dir does not exist or is not a directory
} else {
for (int i=0; i<filelist.length; i++) {
// Get filename of file or directory
String filename = filelist[i];
}
}
// if(filelistInSubfolder == null) ............
} catch (IOException e) {
e.printStackTrace();
}
}
Emulator window was out of view and was recentred
Emulator] WARNING: Data partition already in use. Changes will not persist!
Emulator] WARNING: SD Card image already in use: C:\Documents and Settings\user_name\.android\avd\hvga21_up1_7.avd/sdcard.img
Emulator] WARNING: Cache partition already in use. Changes will not persist!
Basic step
Try restart Eclipse if using from menu File->Restart
Other solutions
Solution 1: try restart ADB server
//android.okhelp.cz/how-quickly-restart-adb-exe-adb-server-android-emulator-example/
Solution 2:
//android.okhelp.cz/android-emulator-wont-run-application-started-from-eclipse/
Solution 3:
Try delete:
Try solution 4:
Eclipse menu select Window->Preferences->Android
Windows 32
FROM: C:\Program Files\Android\android-sdk
TO: C:\PROGRA~1\Android\android-sdk
Windows 64
FROM: C:\Program Files (x86)\Android\android-sdk
TO: C:\PROGRA~2\Android\android-sdk
Emulator] WARNING: Data partition already in use. Changes will not persist!
Emulator] WARNING: SD Card image already in use: C:\Documents and Settings\user_name\.android\avd\hvga21_up1_7.avd/sdcard.img
Emulator] WARNING: Cache partition already in use. Changes will not persist!
Basic step
Try restart Eclipse if using from menu File->Restart
Other solutions
Solution 1: try restart ADB server
//android.okhelp.cz/how-quickly-restart-adb-exe-adb-server-android-emulator-example/
Solution 2:
Delete Run Configuration
//android.okhelp.cz/android-emulator-wont-run-application-started-from-eclipse/
Solution 3:
Try delete:
c:\Documents and Settings\user_name\.android\avd\my_avd.avd\cache.img
c:\Documents and Settings\user_name\.android\avd\my_avd.avd\userdata-qemu.img
Try solution 4:
Eclipse menu select Window->Preferences->Android
Windows 32
FROM: C:\Program Files\Android\android-sdk
TO: C:\PROGRA~1\Android\android-sdk
Windows 64
FROM: C:\Program Files (x86)\Android\android-sdk
TO: C:\PROGRA~2\Android\android-sdk
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"
/>
Drawable dr = getResources().getDrawable(R.drawable.algebra);
int h = dr.getIntrinsicHeight();
int w = dr.getIntrinsicWidth();
Bitmap ball = BitmapFactory.decodeResource(getResources(), R.drawable.algebra);
int _nWidth = ball.getWidth();
int _nHeight = ball.getHeight();
Call requires API level 16 (current min is 4): android
Change The SDK version in AndroidManifest.xml to higher
Change The SDK version in AndroidManifest.xml to higher
<uses-sdk android:minSdkVersion="4" />
//
<uses-sdk android:minSdkVersion="8" />
Editace: 2013-12-09 13:11:26
Počet článků v kategorii: 396
Url:draw-circle-android-basic-example