Android中几种图片特效的处理的实现方法

Android中几种图片特效的处理的实现方法

android中几种图片特效的处理

这里有放大缩小图片，获得圆角图片，获得带倒影图片的几种方法及实现代码，

package com.android.tutor;

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 {

//放大缩小图片

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;

}

//将Drawable转化为Bitmap

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;

}

//获得圆角图片的方法

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(recmHmIQFAmYt);

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;

}

//获得带倒影的图片方法

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);

// Set the Transfer mode to be porter duff and destination in

paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));

// Draw a rectangle using the paint with our linear gradient

canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()

+ reflectionGap, paint);

return bitmapWithReflection;

}

}

修改main.xml布局文件,主要放了两个ImageView控件,代码如下:

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

android:id="@+id/image01"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10px"

/>

android:id="@+id/image02"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10px"

/>

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

android:id="@+id/image01"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10px"

/>

android:id="@+id/image02"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10px"

/>

android:id="@+id/image01"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10px"

/>

android:id="@+id/image02"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10px"

/>

android:id="@+id/image02"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10px"

/>

修改主核心程序,ImageDemo.java,代码如下:

package com.android.tutor;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.widget.ImageView;

public class Imagedemo extends Activity {

private ImageView mImageView01,mImageView02;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

setupViews();

}

private void setupViews(){

mImageView01 = (ImageView)findViewById(R.id.image01);

mImageView02 = (ImageView)findViewById(R.id.image02);

//获取壁纸返回值是Drawable

Drawable drawable = getWallpaper();

//将Drawable转化为Bitmap

Bitmap bitmap = ImageUtil.drawableToBitmap(drawable);

//缩放图片

Bitmap zoomBitmap = ImageUtil.zoomBitmap(bitmap, 100, 100);

//获取圆角图片

Bitmap roundBitmap = ImageUtil.getRoundedCornerBitmap(zoomBitmap, 10.0f);

//获取倒影图片

Bitmap reflectBitmap = ImageUtil.createReflectionImageWithOrigin(zoomBitmap);

//这里可以让Bitmap再转化为Drawable

// Drawable roundDrawable = new BitmapDrawable(roundBitmap);

// Drawable reflectDrawable = new BitmapDrawable(reflectBitmap);

// mImageView01.setBackgroundDrawable(roundDrawable);

// mImageView02.setBackgroundDrawable(reflectDrawable);

mImageView01.setImageBitmap(roundBitmap);

mImageView02.setImageBitmap(reflectBitmap);

}

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}

以上就是Android中几种图片特效的方法整理，如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！

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