[置顶] Android 图片处理特效

 

Android --- 图片处理的方法

转换 -  drawable To  bitmap

缩放 -  Zoom

圆角 -  Round Corner

倒影 -  Reflected

bitmapPrcess  code:

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 bitmapProcess {

    // zoom
    public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h){
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        Matrix matrix = new Matrix();

        float scaleWidth = w/(float)width;
        float scaleHeight = h/(float)height;
        matrix.postScale(scaleWidth, scaleHeight);

        Bitmap bitmap2 = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
        return bitmap2;
    }


    // drawable to bitmap
    public static Bitmap drawable2Bitmap(Drawable drawable){
        int width = drawable.getIntrinsicHeight();
        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;
    }


    // Round Corner Bitmap
    public static Bitmap getRoundCornerBitmap(Bitmap bitmap, float roundPX){
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();

        Bitmap bitmap2 = Bitmap.createBitmap(width, height, Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap2);

        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, width, height);
        final RectF rectF = new RectF(rect);

        paint.setColor(color);
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        canvas.drawRoundRect(rectF, roundPX, roundPX, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return bitmap2;
    }

    // Reflect Bitmap
    public static Bitmap createReflectedBitmap(Bitmap bitmap){
        final int reflectedGap = 4;
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();

        Matrix matrix = new Matrix();
        matrix.preScale(1, -1);

        Bitmap reflectedImage = Bitmap.createBitmap(bitmap, 0, height/2, width, height/2, matrix, false);
        Bitmap reflectedBitmap = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);

        Canvas canvas = new Canvas(reflectedBitmap);
        canvas.drawBitmap(bitmap, 0, 0, null);
        Paint defaultPaint = new Paint();
        canvas.drawRect(0, height, width, height + reflectedGap, defaultPaint);
        canvas.drawBitmap(reflectedImage, 0, height + reflectedGap, null);

        Paint paint = new Paint();
        LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
                                reflectedBitmap.getHeight() + reflectedGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
        paint.setShader(shader);
        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
        canvas.drawRect(0, height, width, reflectedBitmap.getHeight() + reflectedGap, paint);

        return reflectedBitmap;
    }

}

Java Code:

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.ImageView;

public class MyBitmapProcessActivity extends Activity {
    private ImageView imgView1;
    private ImageView imgView2;
    private ImageView imgView3;
    private ImageView imgView4;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        drawBitmap();
    }


    private void drawBitmap(){
        imgView1 = (ImageView)findViewById(R.id.imgView1);
        imgView2 = (ImageView)findViewById(R.id.imgView2);
        imgView3 = (ImageView)findViewById(R.id.imgView3);
        imgView4 = (ImageView)findViewById(R.id.imgView4);

        Drawable drawable = this.getWallpaper();

        Bitmap bitmap = bitmapProcess.drawable2Bitmap(drawable);                        // drawable to bitmap
        Bitmap zoomBitmap = bitmapProcess.zoomBitmap(bitmap, 100, 100);                 // zoom
        Bitmap roundBitmap = bitmapProcess.getRoundCornerBitmap(zoomBitmap, 10.0f);     // round corner
        Bitmap reflectedBitmap = bitmapProcess.createReflectedBitmap(zoomBitmap);       // reflect bitmap

        // drawable to bitmap
        imgView1.setImageBitmap(bitmap);
        imgView2.setImageBitmap(zoomBitmap);
        imgView3.setImageBitmap(roundBitmap);
        imgView4.setImageBitmap(reflectedBitmap);

        // bitmap to drawable
        Drawable roundDrawable = new BitmapDrawable(roundBitmap);
        Drawable reflectedDrawable = new BitmapDrawable(reflectedBitmap);
        imgView1.setBackgroundDrawable(roundDrawable);
        imgView2.setBackgroundDrawable(reflectedDrawable);
    }
}

XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

     <ImageView android:id="@+id/imgView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>


    <ImageView android:id="@+id/imgView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <ImageView android:id="@+id/imgView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>


    <ImageView android:id="@+id/imgView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

效果图：

drawable2bitmap

zoom

round corner

reflected bitmap