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Create bitmap and draw text into bitmap Android example


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public class ApokusActivity 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.GREEN);
            
           Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.ALPHA_8);
           Canvas c = new Canvas(b);
           c.drawRect(0, 0, 200, 200, paint);
           
           paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
           paint.setTextSize(40);
           paint.setTextScaleX(1.f);
           paint.setAlpha(0);
           paint.setAntiAlias(true);
           c.drawText("Your text", 30, 40, paint);
           paint.setColor(Color.RED);
           
           canvas.drawBitmap(b, 10,10, paint);
		}

	}
}


draw-text-into-bitmap-android


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Další témata ....(Topics)


298

SurfaceView implements Runnable Android Code | surfaceview-implements-runnable-android-code



package cz.okhelp.surfview;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;

public class MainActivity extends Activity implements OnTouchListener {
	OurView v;
	Bitmap ball, blob;
	float x, y;
	Sprite sprite;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// setContentView(R.layout.activity_our_view);
		v = new OurView(this);
		v.setOnTouchListener(this);
		ball = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
		x = y = 0;
		setContentView(v);
	}


	@Override
	protected void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
		v.pause();
	}

	@Override
	protected void onResume() {
		// TODO Auto-generated method stub
		super.onResume();
		v.resume();
	}

	public class OurView extends SurfaceView implements Runnable {
		Thread t = null;
		SurfaceHolder holder;
		boolean isItOK = false;

		public OurView(Context context) {
			super(context);
			// TODO Auto-generated constructor stub
			holder = getHolder();
		}

		public void run() {
			// TODO Auto-generated method stub
			while (isItOK == true) {
				// perform canvas drawing
				if (!holder.getSurface().isValid()) {
					continue;
				}
				// sprite = new Sprite(OurView.this,blob);
				Canvas c = holder.lockCanvas();
				c.drawARGB(255, 100, 100, 10);
				c.drawBitmap(ball, x, y, null);
				// onDraw(c);
				holder.unlockCanvasAndPost(c);
			}
		}

		protected void onDraw(Canvas canvas) {
			// sprite.onDraw(canvas);
		}

		public void pause() {
			isItOK = false;
			while (true) {
				try {
					t.join();
				} catch (InterruptedException e) {
					// TODO: handle exception
					e.printStackTrace();
				}
				break;
			}// end while
		}

		public void resume() {
			isItOK = true;
			t = new Thread(this);
			t.start();
		}
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		// TODO Auto-generated method stub
		try {
			Thread.sleep(50);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			x = event.getX();
			y = event.getY();

			break;
		case MotionEvent.ACTION_UP:
			x = event.getX();
			y = event.getY();

			break;
		case MotionEvent.ACTION_MOVE:
			x = event.getX();
			y = event.getY();

			break;
		}// end switch

		return true;
	}

}

235

Programmatically determine if App is running on Android Emulator | programmatically-determine-if-app-is-running-on-android-emulator


You can get list by class Build
For example:

if(Build.MANUFACTURER.equals("unknown")) {
		// Emulator
	}


List of Build class getting from emulator:
"BOARD=unknown
BRAND=generic
CPU_ABI=armeabi
DEVICE=generic
DISPLAY=sdk-eng 2.1-update1 ECLAIR 35983 test-keys
FINGERPRINT=generic/sdk/generic/:2.1-update1/ECLAIR/35983:eng/test-keys
HOST=android-test-13.mtv.corp.google.com
ID=ECLAIR
MANUFACTURER=unknown
MODEL=sdk
PRODUCT=sdk
TAGS=test-keys
TIME=1273161972000
TYPE=eng
USER=android-build
"
282

Open Save UTF-8 File To String Java Android Code | open-save-utf-8-file-to-string-java-android-code



String sFileContent = readFile("myfile.txt",StandardCharsets.UTF_8);

	static String readFile(String path, Charset encoding) 
		  throws IOException 
		{
		  byte[] encoded = Files.readAllBytes(Paths.get(path));
		  return encoding.decode(ByteBuffer.wrap(encoded)).toString();
		}

// write file
String sOut = "text blah hello world etc.";
		writeToFile(sOut"someName.txt");	
	static void writeToFile(String sB,String name) {
		String folder = ("c:\\folder\\");
		File f = new File(folder+ name);
		BufferedWriter writer = null;
			writer = new BufferedWriter( new OutputStreamWriter(
                           new FileOutputStream( folder+name),"UTF-8"));
			writer.write( sB);

				if ( writer != null)
					writer.close( );
	}

306

Eclipse Escape text when pasting into a string literal | eclipse-escape-text-when-pasting-into-a-string-literal



Window>Preference>Java>Editor>Typing and check the "Escape text when pasting into a string literal".
96

onSaveInstanceState() onRestoreInstanceState() basic Android example | onsaveinstancestate-onrestoreinstancestate-basic-android-example



public class MyClass extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       }
	 String sMyText = "some text";
	 int nMyInt = 10;

 @Override
 protected void onSaveInstanceState(Bundle outState) {
     // Save away the original text, so we still have it if the activity
     // needs to be killed while paused.
     outState.putString("my_text", sMyText);
     outState.putInt("my_int", nMyInt);
     Toast.makeText(this, "onSaveInstanceState()", Toast.LENGTH_LONG).show();
Log.i("onSaveInstanceState", "onSaveInstanceState()");
}
 String sNewMyText = "";
 int nNewMyInt = 0;
 
 @Override
 protected void onRestoreInstanceState(Bundle savedInstanceState) {
     super.onRestoreInstanceState(savedInstanceState);
     // restore saved values
     sNewMyText = savedInstanceState.getString("my_text");
     nNewMyInt = savedInstanceState.getInt("my_int");
     Toast.makeText(this, "onRestoreInstanceState()", Toast.LENGTH_LONG).show();
     Log.i("onRestoreInstanceState", "onRestoreInstanceState()");
     
 }
}


Editace: 2013-12-09 13:10:02
Počet článků v kategorii: 397
Url:create-bitmap-and-draw-text-into-bitmap-android-example

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