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Draw Path drawPath draw the trajectory of shot Android basic example


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Draw the trajectory of shot.

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);

		}
	       private static void makePath(Path p) {
	            p.moveTo(10, 0);
	            p.cubicTo(100, -50, 200, 150, 300, 0);
	        }
		@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);
 
			p.setColor(Color.BLACK);
			Path mPath = new Path();
            makePath(mPath);
			canvas.drawPath(mPath, p); //(rectF, 90, 45, true, p);
		}

	}
}

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48

How quickly restart adb.exe ADB server Android emulator example | how-quickly-restart-adb-exe-adb-server-android-emulator-example


Create file restartADB.bat in folder
c:\Program Files\Android\android-sdk-windows\platform-tools\
Write into restartADB.bat this code:

adb kill-server && adb start-server
pause

Save restartADB.bat file.
If you want restart adb.exe server, run restartADB.bat by double click on icon.


Next example:

  1. Open Total Commander

  2. Open folder with adb.exe usually in
    c:\Program Files\Android\android-sdk-windows\platform-tools\

  3. Put into command line command: adb kill-server && adb start-server and press Enter



[caption id="attachment_778" align="alignleft" width="300" caption="ADB server restart by command line"]adb-restart-server-android-emulator[/caption]

Try restart ADB if this or similar errors:
Emulator] emulator: emulator window was out of view and was recentred



40

Spinner ComboBox DropDown set on selected item listener setOnItemSelectedListener Java Android example | spinner-combobox-set-on-selected-item-listener-setonitemselectedlistener-java-android-example


Spinner, ArrayAdapter, setOnItemSelectedListener, onItemSelected, setDropDownViewResource

MainClass.java

public class Vypocet extends Activity {
 Spinner   hSpinnerMetry;
// .......
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

	       hSpinnerMetry = (Spinner) findViewById(R.id.idSpinnerMetry);
	        ArrayAdapter<CharSequence> adapterMetry = ArrayAdapter.createFromResource(
	        		this, R.array.metry_array, android.R.layout.simple_spinner_item);
	        adapterMetry.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
	        hSpinnerMetry.setAdapter(adapterMetry);
			
	           hSpinnerMetry.setOnItemSelectedListener(
	                    new OnItemSelectedListener() {
	                        public void onItemSelected(
	                                AdapterView<?> parent, View view, int position, long id) {
	                        int nPos = position;
	                        }

	                        public void onNothingSelected(AdapterView<?> parent) {
	                        
	                        }
	                    });	        

      }
}



strings.xml


<string-array name="metry_array">
<item>m</item>
<item>dm</item>
<item>cm</item>
<item>mm</item>
</string-array>


2

Click Handler | click-handler-android-code


Click Handler Android Java example source code. Open new class as activity and open URL in browser.
In layout.xml file:



In string.xml

myClickHandler



In MainClass.java file

	public void myClickHandler(View view) {
		switch (view.getId()) {
		// open new class as activity
		case R.id.btnOpenClass: {
				Intent pictureActivity = new Intent(getBaseContext(),
						MyClass.class);
				startActivity(pictureActivity);
		}
		break;			
			
		case R.id.btnAbout: {
			//aboutDialogCreate();
		}
			break;
			
		// open url	
		 case R.id.btnHome: {
		 String url = "//android.okhelp.cz/";
		 Intent i = new Intent(Intent.ACTION_VIEW);
		 i.setData(Uri.parse(url));
		 startActivity(i);
		 }break;

		}

	}// end myClickHandler

// listener .. if click on button will scrolling to mTextView bottom
private OnClickListener mButtonListener = new OnClickListener() {
	    public void onClick(View v) {
	      // do something when the button is clicked
	    int nBottom =	mTextView.getBottom();
	    hScrollView.scrollTo(0, nBottom);
	    }
	};

146

Rotate a image bitmap picture Android example | rotate-a-image-bitmap-android-example


Rotate a bitmap Android source code.

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) {
			Paint paint = new Paint();
			
			canvas.drawColor(Color.YELLOW);
            
          // Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888);
			
		    //  you need to insert a image flower_blue into res/drawable folder 
			Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.flower_blue);
			 Matrix mat = new Matrix();
			                mat.postRotate(90);
			                Bitmap bmpRotate = Bitmap.createBitmap(bmp, 0, 0,
			  bmp.getWidth(), bmp.getHeight(),
			  mat, true);
		   int h = bmp.getHeight();
           
           canvas.drawBitmap(bmp, 10,10, paint);
           canvas.drawBitmap(bmpRotate, 10,10 + h + 10, paint);
           
		}

	}
}




rotate bitmap android
218

How to save the state of Activity - Android | how-to-save-the-state-of-activity-android


onSaveInstanceState, onRestoreInstanceState , save preferences

int mCurrentPhotoIndex = 0;
   @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putInt("photo_index", mCurrentPhotoIndex);
        super.onSaveInstanceState(outState);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        mCurrentPhotoIndex = savedInstanceState.getInt("photo_index");
        super.onRestoreInstanceState(savedInstanceState);
    }

// or save preferences for new start of Activity in onStop
//onCreate or onResume or onStart etc.
public void loadPreferences() {
		SharedPreferences settings = getSharedPreferences(F.PREFERENCES_NAME, 0);
		mCurrentPhotoIndex = settings.getInt("mCurrentPhotoIndex",mCurrentPhotoIndex);
	// String_sOtazka = settings.getString("_sOtazka", _sOtazka);


}
// onStop
public void savePreferences() {
		SharedPreferences settings = getSharedPreferences(PREFERENCES_NAME, 0);
		SharedPreferences.Editor editor = settings.edit();
		editor.putInt("mCurrentPhotoIndex", mCurrentPhotoIndex);
                // String, boolean, float ...
		// editor.putString("mButton1", mButton1.getText().toString());

		editor.commit();

}



Editace: 2013-12-09 13:10:58
Počet článků v kategorii: 397
Url:draw-path-drawpath-android-basic-example

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