Android Open Source - FrameLite Bitmap Utils

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Back to project page FrameLite.
License

The source code is released under:
GNU General Public License
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Java Source Code

package com.miku.framelite.utils;
//  ww w.  j a va2 s  .c o  m
import java.io.ByteArrayOutputStream;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.util.Base64;
import android.view.View;
import android.view.View.MeasureSpec;

/**
 * Bitmap???
 * 
 * @author xr.lee
 * 
 */
public class BitmapUtils {

  /**
   * ?View?????Bitmap
   * 
   * @param view
   * @return
   */
  public static Bitmap convertViewToBitmap(View view) {
    view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
    view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
    view.buildDrawingCache();
    Bitmap bitmap = view.getDrawingCache();
    return bitmap;
  }

  /**
   * ??Bitmap?????
   * 
   * @param bitmap
   * @param dstWidth
   * @param dstHeight
   * @return
   */
  public static Bitmap scaleBitmap(Bitmap bitmap, int dstWidth, int dstHeight) {
    int w = bitmap.getWidth();
    int h = bitmap.getHeight();

    Matrix matrix = new Matrix();
    float scaleWidth = ((float) dstWidth / w);
    float scaleHeight = ((float) dstHeight / h);
    matrix.postScale(scaleWidth, scaleHeight);

    return Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);
  }

  /**
   * ?????????bitmap,???dstWidth?dstHeight?????
   * 
   * @param bitmap
   * @param dstWidth
   * @param dstHeight
   * @return
   */
  public static Bitmap scaleBitmapKeepRatio(Bitmap bitmap, int dstWidth, int dstHeight) {
    int w = bitmap.getWidth();
    int h = bitmap.getHeight();
    float ratio = ((float) w) / h;
    if (dstWidth > dstHeight) {
      dstWidth = (int) (dstHeight * ratio);
    } else {
      dstHeight = (int) (dstWidth / ratio);
    }
    return scaleBitmap(bitmap, dstWidth, dstHeight);
  }

  /**
   * ?Drawable?????Bitmap
   * 
   * @param drawable
   * @return
   */
  public static Bitmap convertDrawableToBitmap(Drawable drawable) {
    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
        drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
    drawable.draw(canvas);
    return bitmap;
  }

  /**
   * ?Bitmap??byte[]??
   * 
   * @param bm
   * @return
   */
  public static byte[] bitmapToBytes(Bitmap bm) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
    return baos.toByteArray();
  }

  /**
   * ?bitmap??????base64???
   * @param bitmap
   * @return base64 ???
   */
  public static String bitmap2Base64(Bitmap bitmap, int bitmapQuality) {
    // ?Bitmap?????????
    String string = null;
    byte[] bytes = bitmapToBytes(bitmap);
    string = Base64.encodeToString(bytes, Base64.DEFAULT);
    return string;
  }

  /**
   * ?base64??????bitmap??
   * @param string base64???
   * @return bitmap
   */
  public static Bitmap base642Bitmap(String string) {
    // ??????????Bitmap??
    Bitmap bitmap = null;
    try {
      byte[] bitmapArray;
      bitmapArray = Base64.decode(string, Base64.DEFAULT);
      bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0,
      bitmapArray.length);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return bitmap;
  }
}
Java Source Code List
