Bitmap.createBitmap : Bitmap « 2D Graphics « Android






  1. Android
  2. 2D Graphics
  3. Bitmap

Bitmap.createBitmap

    
package app.test;

import java.io.FileNotFoundException;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class Test extends Activity implements OnClickListener {
  Button choosePicture1, choosePicture2;
  ImageView compositeImageView;
  Bitmap bmp1, bmp2;
  Canvas canvas;
  Paint paint;

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

    compositeImageView = (ImageView) this
        .findViewById(R.id.CompositeImageView);

    choosePicture1 = (Button) this.findViewById(R.id.ChoosePictureButton1);
    choosePicture2 = (Button) this.findViewById(R.id.ChoosePictureButton2);

    choosePicture1.setOnClickListener(this);
    choosePicture2.setOnClickListener(this);
  }

  public void onClick(View v) {
    Intent choosePictureIntent = new Intent(Intent.ACTION_PICK,
        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(choosePictureIntent, 1);
  }

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

    if (resultCode == RESULT_OK) {
      Uri imageFileUri = intent.getData();
      bmp1 = loadBitmap(imageFileUri);
      Bitmap drawingBitmap = Bitmap.createBitmap(bmp1.getWidth(),
          bmp1.getHeight(), bmp1.getConfig());
      canvas = new Canvas(drawingBitmap);
      paint = new Paint();
      canvas.drawBitmap(bmp1, 0, 0, paint);
      paint.setXfermode(new PorterDuffXfermode(
          android.graphics.PorterDuff.Mode.MULTIPLY));
      canvas.drawBitmap(bmp2, 0, 0, paint);
      compositeImageView.setImageBitmap(drawingBitmap);
    }
  }

  private Bitmap loadBitmap(Uri imageFileUri) {
    Display currentDisplay = getWindowManager().getDefaultDisplay();

    float dw = currentDisplay.getWidth();
    float dh = currentDisplay.getHeight();

    Bitmap returnBmp = Bitmap.createBitmap((int) dw, (int) dh,
        Bitmap.Config.ARGB_4444);
    try {
      BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
      bmpFactoryOptions.inJustDecodeBounds = true;
      returnBmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageFileUri), null, bmpFactoryOptions);
      bmpFactoryOptions.inSampleSize = 2;
      bmpFactoryOptions.inJustDecodeBounds = false;
      returnBmp = BitmapFactory.decodeStream(getContentResolver()
          .openInputStream(imageFileUri), null, bmpFactoryOptions);
    } catch (Exception e) {
      Log.v("ERROR", e.toString());
    }
    return returnBmp;
  }
}








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