Google Android - это несложно

Код: Выделить всё

import java.io.File;
import java.io.FileOutputStream;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore.Images.Media;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener,
    OnTouchListener {

  ImageView choosenImageView;
  Button choosePicture;
  Button savePicture;

  Bitmap bmp;
  Bitmap alteredBitmap;
  Canvas canvas;
  Paint paint;
  Matrix matrix;
  float downx = 0;
  float downy = 0;
  float upx = 0;
  float upy = 0;
  
  private static File APP_FILE_PATH = new File("/sdcard/mypicture");


  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    choosenImageView = (ImageView) this.findViewById(R.id.ChoosenImageView);
    choosePicture = (Button) this.findViewById(R.id.ChoosePictureButton);
    savePicture = (Button) this.findViewById(R.id.SavePictureButton);

    savePicture.setOnClickListener(this);
    choosePicture.setOnClickListener(this);
    choosenImageView.setOnTouchListener(this);
  }

  public void onClick(View v) {

//    if (v == choosePicture) {
//      Intent choosePictureIntent = new Intent(
//          Intent.ACTION_PICK,
//          android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
//      startActivityForResult(choosePictureIntent, 0);
//    } else 
    	if (v == savePicture) {

      if (alteredBitmap != null) {
        ContentValues contentValues = new ContentValues(3);
        contentValues.put(Media.DISPLAY_NAME, "Draw On Me");

       // Uri imageFileUri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, contentValues);
        try {
        	
        	FileOutputStream out = new FileOutputStream(new File(APP_FILE_PATH + "/test0987.png"));
        	alteredBitmap.compress(CompressFormat.PNG, 90, out);
        	
//        OutputStream imageFileOS = getContentResolver().openOutputStream(imageFileUri);
//          alteredBitmap.compress(CompressFormat.JPEG, 90, imageFileOS);
          
                   
          Toast t = Toast.makeText(this, "Saved!", Toast.LENGTH_SHORT);
          t.show();

        } catch (Exception e) {
          Log.v("EXCEPTION", e.getMessage());
        }
      }
    }
  }

  protected void onActivityResult(int requestCode, int resultCode,
      Intent intent) {
    super.onActivityResult(requestCode, resultCode, intent);

    if (resultCode == RESULT_OK) {
      Uri imageFileUri = intent.getData();
      try {
        BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
        bmpFactoryOptions.inJustDecodeBounds = true;
        bmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(
                imageFileUri), null, bmpFactoryOptions);

        bmpFactoryOptions.inJustDecodeBounds = false;
        bmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(
                imageFileUri), null, bmpFactoryOptions);

        alteredBitmap = Bitmap.createBitmap(bmp.getWidth(), bmp
            .getHeight(), bmp.getConfig());
        canvas = new Canvas(alteredBitmap);
        paint = new Paint();
        paint.setColor(Color.GREEN);
        paint.setStrokeWidth(5);
        matrix = new Matrix();
        canvas.drawBitmap(bmp, matrix, paint);

        choosenImageView.setImageBitmap(alteredBitmap);
        choosenImageView.setOnTouchListener(this);
      } catch (Exception e) {
        Log.v("ERROR", e.toString());
      }
    }
  }
  public boolean onTouch(View v, MotionEvent event) {
    int action = event.getAction();
    switch (action) {
    case MotionEvent.ACTION_DOWN:
      downx = event.getX();
      downy = event.getY();
      break;
    case MotionEvent.ACTION_MOVE:
      upx = event.getX();
      upy = event.getY();
      canvas.drawLine(downx, downy, upx, upy, paint);
      choosenImageView.invalidate();
      downx = upx;
      downy = upy;
      break;
    case MotionEvent.ACTION_UP:
      upx = event.getX();
      upy = event.getY();
      canvas.drawLine(downx, downy, upx, upy, paint);
      choosenImageView.invalidate();
      break;
    case MotionEvent.ACTION_CANCEL:
      break;
    default:
      break;
    }
    return true;
  }
}

Код: Выделить всё

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>