Draw Arc Android basic example

drawArc(), Canvas, Paint, 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(5);
			// opacity
			//p.setAlpha(0x80); //
 
			RectF rectF = new RectF(50, 20, 100, 80);
			canvas.drawOval(rectF, p);
			p.setColor(Color.BLACK);
			canvas.drawArc (rectF, 90, 45, true, p);
		}

	}
}

396LW NO topic_id

Další témata ....(Topics)

No resource found that matches the given name Eclipse Android xml file | no-resource-found-that-matches-the-given-name-eclipse-android-xml-file

No resource found that matches the given name - error examples.
Exist resource file?
Is code written correctly?


// No resource found that matches the given name (at id with value @id/myButton).
 android:id="@id/myButton" // invalid id notation
 android:id="@+id/myButton" // correct


 // No resource found that matches the given name 
// (at icon with value @drawable/icons).
// exist file icons in res/drawable folder?
<application android:icon="@drawable/icons" 

//No resource found that matches the given name 
//(at theme with value @style/MyThem).
<activity android:name=".Main"
                  android:label="@string/app_name"
                  android:theme="@style/MyThem">

// Exist style MyThem  in styles.xml ?  No only MyTheme
<style name="MyTheme" parent="android:Theme">
        <item name="android:windowTitleSize">50px</item>
</style>



// exist file my_background in folder drawable ?
android:background="@drawable/my_background" // 

// no resource found that matches the given name(at "label" with value "@string/app_name")
// have you the string resource defined in res/values/strings.xml ?
<string name="app_name">"My App"</string>

352

Android Fragment onAttach deprecated | android-fragment-onattach-deprecated


// Context instead Activity as a parameter
@Override
public void onAttach(Context context) {
    super.onAttach(context);

    Activity a;

    if (context instanceof Activity){
        a=(Activity) context;
    }

}


OnNoteClickedListener listener;
/* old emxample of usage
	@Override
	public void onAttach(Activity activity) {
		super.onAttach(activity);
		try {
			listener = (OnNoteClickedListener) activity;
		} catch (ClassCastException e) {
			throw new ClassCastException(activity.toString()
					+ " must implement OnNoteClickedListener");
		}
	}
*/
// new version of code
	@Override
	public void onAttach(Context context) {
		super.onAttach(context);

		Activity a;

		if (context instanceof Activity){
			a=(Activity) context;
			try {
				listener = (OnNoteClickedListener) a;
			} catch (ClassCastException e) {
				throw new ClassCastException(a.toString()
						+ " must implement OnNoteClickedListener");
			}
		}

	}

367

Who has higher priority build.gradle or AndroidManifest Android Studio | who-has-higher-priority-build-gradle-or-androidmanifest-android-studio

build.gradle in module have higher priority then AndrodiManifest.xml
Try this.
AndroidManifest.xml have code:


    <uses-sdk
        android:minSdkVersion="9"
        android:targetSdkVersion="23" />

build.gradle have code:


   defaultConfig {
        applicationId "cz.okhelp.words"
        minSdkVersion 9
        targetSdkVersion 19
        versionCode 107
        versionName "1.0.7"
    }

Warning in AndroidManifest.xml:

This targetSdkVersion value (23) is not used; it is always overridden by the value specified in the Gradle build script (19) less... (Ctrl+F1) 

The value of (for example) minSdkVersion is only used if it is not specified in the build.gradle build scripts. When specified in the Gradle build scripts, the manifest value is ignored and can be misleading, so should be removed to avoid ambiguity.

190

configChanges value of the com.google.ads.AdActivity must include | configchanges-value-of-the-com-google-ads-adactivity-must-include

Errors:
E/Ads(333): The android:configChanges value of the com.google.ads.AdActivity must include screenLayout.
E/Ads(333): The android:configChanges value of the com.google.ads.AdActivity must include uiMode.
E/Ads(333): The android:configChanges value of the com.google.ads.AdActivity must include screenSize.
E/Ads(333): The android:configChanges value of the com.google.ads.AdActivity must include smallestScreenSize.
E/Ads(333): You must have AdActivity declared in AndroidManifest.xml with configChanges.

Solution:
Try to using a lower version of the GoogleAdMobAdsSDK ADS SDK in project:
GoogleAdMobAdsSDK-4.0.4
How add SDK to project

Add activity to AndroidManifest.xml



// .............. blah
    <uses-sdk android:minSdkVersion="4"/>
   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application android:icon="@drawable/dicts_ico" android:label="@string/app_name" 
    >
           <meta-data 
        android:value="a12345_your_number" 
        android:name="ADMOB_PUBLISHER_ID" />
        <activity android:name=".MainStartMenu"
                  android:label="@string/app_name"
                  android:configChanges="keyboardHidden|orientation"
                  >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>


  <!-- Google ads -->      
<activity android:name="com.google.ads.AdActivity"
              android:configChanges="keyboard|keyboardHidden|orientation"/>

// ......... blah

break statement in Java Android example | break-statement-in-java-android-example

break statement in Java Android basic example

MainClass.java


public class MainClass {
	public static void main(String[] arg) {
		String[] arrayOfString = {"nothing", "Hello", "people"
				, "bye-bye", "hello", "world!", "end" };
		
		for (int i = 0; i < arrayOfString.length; i++) {
				System.out.println(arrayOfString[i]);
				if(i > 2) 
					break; // end of loop
		}
	}
}
/*
nothing
Hello
people
bye-bye
*/

Editace: 2013-12-09 13:11:05
Počet článků v kategorii: 396
Url:draw-arc-android-basic-example