android编程中图片,Android编程中图片特效处理方法小结

一时失言乱红尘 2022-10-14 00:46 16阅读 0赞

本文实例总结了Android编程中图片特效处理方法。分享给大家供大家参考，具体如下：

这里介绍的Android图片处理方法包括：

转换 -  drawable To  bitmap

缩放 -  Zoom

圆角 -  Round Corner

倒影 -  Reflected

bitmapPrcess  code:

package com.learn.games;

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:

package com.learn.games;

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:

android:orientation="vertical"

android:layout\_width="fill\_parent"

android:layout\_height="fill\_parent"

android:layout\_width="wrap\_content"

android:layout\_height="wrap\_content"/>

android:layout\_width="wrap\_content"

android:layout\_height="wrap\_content"/>

android:layout\_width="wrap\_content"

android:layout\_height="wrap\_content"/>

android:layout\_width="wrap\_content"

android:layout\_height="wrap\_content"/>

效果图：

drawable2bitmap

![e266778f4add445b63ee280adc7ff71a.gif][]

zoom

![1e2b1336644bc252c9c213abd19ad693.gif][]

round corner

![e3c2208f0c894c84cbec953e164fc07c.gif][]

reflected bitmap

![d6f234365063984f3598660edb4402bf.gif][]

希望本文所述对大家Android程序设计有所帮助。

[e266778f4add445b63ee280adc7ff71a.gif]: /images/20221014/8823d2a9ecb743dcb77ebc60e63e2bc4.png
[1e2b1336644bc252c9c213abd19ad693.gif]: /images/20221014/1290d7f6696944058528dc3ca1928aca.png
[e3c2208f0c894c84cbec953e164fc07c.gif]: /images/20221014/534e3579b2884d85ae1a6fb7b9de307b.png
[d6f234365063984f3598660edb4402bf.gif]: /images/20221014/06d45ebcd80e4160b284c5a5e6daabb0.png