android 图片处理

Posted on 2011-09-16 15:09 蔡清华阅读(3133) 评论() 收藏举报

1、图标加灰色过滤；
2、android的图片资源默认是静态的，单实例；如果两个IM好友的头像一样，最简单的都是用的软件自带头像，有一个在线，一个离线，直接改变头像的灰度，则两个用户的头像都会变灰或者在线，答案是：Drawable.mutate()。

Java代码

Drawable mDrawable = context.getResources().getDrawable(R.drawable.face_icon);
mDrawable.mutate();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilter cf = new ColorMatrixColorFilter(cm);
mDrawable.setColorFilter(cf);

Java代码

public void drawRegion(Image image_src,
int x_src, int y_src,
int width, int height,
int transform,
int x_dest, int y_dest,
int anchor){
if((anchor&VCENTER) != 0){
y_dest -= height/2;
}else if((anchor&BOTTOM) != 0){
y_dest -= height;
}
if((anchor&RIGHT) != 0){
x_dest -= width;
}else if((anchor&HCENTER) != 0){
x_dest -= width/2;
}
Bitmap newMap = Bitmap.createBitmap(image_src.getBitmap(), x_src, y_src, width, height);
Matrix mMatrix = new Matrix();
Matrix temp = new Matrix();
Matrix temp2 = new Matrix();
float[] mirrorY = {
-1, 0, 0,
0, 1, 0,
0, 0, 1
};
temp.setValues(mirrorY);
switch(transform){
case Sprite.TRANS_NONE:
break;
case Sprite.TRANS_ROT90:
mMatrix.setRotate(90,width/2, height/2);
break;
case Sprite.TRANS_ROT180:
mMatrix.setRotate(180,width/2, height/2);
break;
case Sprite.TRANS_ROT270:
mMatrix.setRotate(270,width/2, height/2);
break;
case Sprite.TRANS_MIRROR:
mMatrix.postConcat(temp);
break;
case Sprite.TRANS_MIRROR_ROT90:
mMatrix.postConcat(temp);
mMatrix.setRotate(90,width/2, height/2);
break;
case Sprite.TRANS_MIRROR_ROT180:
mMatrix.postConcat(temp);
mMatrix.setRotate(180,width/2, height/2);
break;
case Sprite.TRANS_MIRROR_ROT270:
mMatrix.postConcat(temp);
mMatrix.setRotate(270,width/2, height/2);
break;
}
mMatrix.setTranslate(x_dest, y_dest);
canvas.drawBitmap(newMap, mMatrix, mPaint);
}

Java代码

public Bitmap returnBitMap(String url) {
URL myFileUrl = null;
Bitmap bitmap = null;
try {
myFileUrl = new URL(url);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
} catch (IOException e) {
e.printStackTrace();
}
Log.v(tag, bitmap.toString());
return bitmap;
}
public static Drawable resizeImage(Bitmap bitmap, int w, int h) {
Bitmap BitmapOrg = bitmap;
int width = BitmapOrg.getWidth();
int height = BitmapOrg.getHeight();
int newWidth = w;
int newHeight = h;
Log.v(tag, String.valueOf(width));
Log.v(tag, String.valueOf(height));
Log.v(tag, String.valueOf(newWidth));
Log.v(tag, String.valueOf(newHeight));
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,
height, matrix, true);
return new BitmapDrawable(resizedBitmap);
}

Java代码

1.图片加载方法，方便用户加载图片
public final Bitmap CreatImage(Context context, int bitAdress) {
Bitmap bitmaptemp = null;
bitmaptemp = BitmapFactory.decodeResource(context.getResources(),
bitAdress);
return bitmaptemp;
}
2.图片平均分割方法，将大图平均分割为N行N列，方便用户使用
public final void cuteImage(Canvas g, Paint paint, Bitmap imgBit, int x,
int y, int w, int h, int line, int row) {
g.clipRect(x, y, x + w, h + y);
g.drawBitmap(imgBit, x – line * w, y – row * h, paint);
g.restore();
}
3.图片缩放，对当前图片进行缩放处理
public Bitmap zoomImage(Bitmap bgimage, int newWidth, int newHeight) {
int width = bgimage.getWidth();
int height = bgimage.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
matrix.postScale(scaleWidth, scaleHeight);
Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, width, height,
matrix, true);
return bitmap;
}
4.绘制带有边框的文字，一般在游戏中起文字的美化作用
public void drawText(String strMsg, Canvas g, Paint paint, int setx,
int sety, int fg, int bg) {
paint.setColor(bg);
g.drawText(strMsg, setx + 1, sety, paint);
g.drawText(strMsg, setx, sety – 1, paint);
g.drawText(strMsg, setx, sety + 1, paint);
g.drawText(strMsg, setx – 1, sety, paint);
paint.setColor(fg);
g.drawText(strMsg, setx, sety, paint);
g.restore();
}
5.Android 图片透明度处理代码
public static Bitmap setAlpha(Bitmap sourceImg, int number) {
int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()];
sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight());
number = number * 255 / 100;
for (int i = 0; i < argb.length; i++) {
argb = (number << 24) | (argb & 0×00FFFFFF);
}
sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888);
return sourceImg;
}
6.图片翻转
Resources res = this.getContext().getResources();
img = BitmapFactory.decodeResource(res, R.drawable.slogo);
Matrix matrix = new Matrix();
matrix.postRotate(90);
int width = img.getWidth();
int height = img.getHeight();
r_img = Bitmap.createBitmap(img, 0, 0, width, height, matrix, true);

Java代码

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.Drawable;
public class ImageUtil {
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidht = ((float) w / width);
float scaleHeight = ((float) h / height);
matrix.postScale(scaleWidht, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
return newbmp;
}
public static Bitmap drawableToBitmap(Drawable drawable) {
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, width, height);
drawable.draw(canvas);
return bitmap;
}
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
final int reflectionGap = 4;
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2, width, height / 2, matrix, false);
Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmapWithReflection);
canvas.drawBitmap(bitmap, 0, 0, null);
Paint deafalutPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);
return bitmapWithReflection;
}
}

Java代码

private byte[] Bitmap2Bytes(Bitmap bm){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}
private Bitmap Bytes2Bimap(byte[] b){
if(b.length!=0){
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
else {
return null;
}
}
private Bitmap createBitmap( Bitmap src, Bitmap watermark )
{
String tag = "createBitmap";
Log.d( tag, "create a new bitmap" );
if( src == null )
{
return null;
}
int w = src.getWidth();
int h = src.getHeight();
int ww = watermark.getWidth();
int wh = watermark.getHeight();
Bitmap newb = Bitmap.createBitmap( w, h, Config.ARGB_8888 );
Canvas cv = new Canvas( newb );
cv.drawBitmap( src, 0, 0, null );
cv.drawBitmap( watermark, w - ww + 5, h - wh + 5, null );
cv.save( Canvas.ALL_SAVE_FLAG );
cv.restore();
return newb;
}
private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format,
int quality) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
src.compress(format, quality, os);
byte[] array = os.toByteArray();
return BitmapFactory.decodeByteArray(array, 0, array.length);
}
static byte[] streamToBytes(InputStream is) {
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
int len;
try {
while ((len = is.read(buffer)) >= 0) {
os.write(buffer, 0, len);
}
} catch (java.io.IOException e) {
}
return os.toByteArray();
}
static Bitmap getViewBitmap(View v) {
v.clearFocus();
v.setPressed(false);
boolean willNotCache = v.willNotCacheDrawing();
v.setWillNotCacheDrawing(false);
int color = v.getDrawingCacheBackgroundColor();
v.setDrawingCacheBackgroundColor(0);
if (color != 0) {
v.destroyDrawingCache();
}
v.buildDrawingCache();
Bitmap cacheBitmap = v.getDrawingCache();
if (cacheBitmap == null) {
Log.e(TAG, "failed getViewBitmap(" + v + ")", new RuntimeException());
return null;
}
Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
v.destroyDrawingCache();
v.setWillNotCacheDrawing(willNotCache);
v.setDrawingCacheBackgroundColor(color);
return bitmap;
}

Java代码

读取raw资源文件中的mp3文件，然后通过音乐播放器播放：
private void writeMP3ToSDcard(String fileName, Context context) {
byte[] buffer = new byte[1024 * 8];
int read;
BufferedInputStream bin = new BufferedInputStream(context.getResources().openRawResource(R.raw.ring));
try {
BufferedOutputStream bout = new BufferedOutputStream(new FileOutputStream(fileName));
while ((read = bin.read(buffer)) > -1) {
bout.write(buffer, 0, read);
}
bout.flush();
bout.close();
bin.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(newFile("XXXXmp3的文件全路径")),"audio/*");
startActivity(intent);

绘制图像倒影

Java代码

private void
_Init()
{
m_paint = new Paint(Paint.ANTI_ALIAS_FLAG);
LinearGradient lg = new LinearGradient(
0, 0, 0, m_nShadowH,
0xB0FFFFFF, 0x00000000,
Shader.TileMode.CLAMP);
m_paint.setShader(lg);
m_paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
}
@Override protected void
onDraw(Canvas canvas)
{
super.onDraw(canvas);
int nX = 0;
int nY = 20;
_DrawNormalImg(canvas, nX, nY);
_DrawMirror(canvas, nX, nY);
}
private void
_DrawNormalImg(Canvas canvas, int nX, int nY)
{
canvas.save(Canvas.MATRIX_SAVE_FLAG);
canvas.translate(nX, nY);
m_dw.draw(canvas);
canvas.restore();
}
private void
_DrawMirror(Canvas canvas, int nX, int nY)
{
int nW = m_dw.getIntrinsicWidth();
int nH = m_dw.getIntrinsicHeight();
canvas.save(Canvas.MATRIX_SAVE_FLAG);
canvas.scale(1.0f, -1.0f);
canvas.translate(nX, -(nY + nH * 2));
canvas.clipRect(0, nH, nW, nH - m_nShadowH);
m_dw.draw(canvas);
canvas.restore();
canvas.save();
canvas.translate(nX, nY + nH);
canvas.drawRect(0, 0, nW, m_nShadowH, m_paint);
canvas.restore();
}

Android 繪圖座標體系預設的原點在左上角，X 軸往右是越來越大的正值，而 Y 軸往下，則是越來越大的正值。要畫出垂直翻轉的圖片，其實也就是要垂直翻轉整個繪圖座標體系。在 Android 中，要如何做？答案就是 canvas.scale(1.0f, -1.0f)。很簡單吧，沒想到給 scale() 函式一個負值，就可以翻轉相對應的軸。
在 Photoshop 中，做鏡像特效的第二步是要對這翻轉的圖片，加個由灰到黑的漸層 mask。
在 Android 中，要畫漸層色，那就一定得用 LinearGradient 這個類別。至於要對背景圖加上個 mask，就請參考一下 Paint 的 setXfermode() 函式。_Init() 這個函式，就是負責生成一個由灰到黑漸層 mask 的 m_paint 物件。

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