图片无限放大,不模糊,图片移动,仿微信图片放大

写此程序背景

看到微信的图片浏览的强大功能,于是自己写了一个。原则上可以无限放大,但是放大部分 像素必须有原图片的1个像素,最小也不能小于1*1像素。

思路:

功能解剖:

缩放:微信的缩放能缩放到用户满意的范围。(放大不会超过max倍,缩小不会超过min)

移动:当图片高与宽小于屏幕时,能移动图片到任意位置。当高或宽大于屏幕时,移动图片则会截取图片某一模块放大满屏显示。

最重要的一点就是图片放大时看不出来图片变模糊


解剖雏形:

假设用系统自带Matrix函数来控制放大缩小。

缩小: 可以缩小很小倍,当不易控制倍数(如1.25倍,但Matrix不会那么精确)

放大:但放大超出屏幕时,Bitmap.createBitmap会在内存中创建一个很大的图(或内存超出系统设定的值或宽高超出屏幕),导致显存或内存不足。

因为上条放大会出现问题所以本方案绝对不行。


解剖过度:

那么要有那么一种缩放方法满足下面条件

一、能几乎精确的缩小到某一个倍数

二、放大时内存不会益处

基于缩放的截取方法想出以下移动方案

一、当放大时移动时计算某个参考点在图上移动的位置所占比列(x,y),高宽为屏幕高度/倍数

二、当缩小的图在屏幕范围之内,那么移动的效果通过移动ImageView的位置实现

方案:因为缩放的关键是放大,所以可以考虑放大时用截取一段图*n倍不会溢出的图

截图方案:一、看到截取就想到用画布canvas解决(于是创建了一个MyBitMap类)能截永远不会内存溢出的放大图。并且图像不会模糊(canvas优秀之处)。

补充:OOM(Out Of Memory)异常

1.放大时不模糊的实现:利用canvas获取放大后的图,就能解决安常规放大后模糊的现状。

2.图片不溢出的实现:在canvas放大时限制图片的大小不超出屏幕就行。

溢出的情况

一、图片的高或宽超出了屏幕。所以在canvas放大时限制图片的大小不超出屏幕就行。

二、某一个bitmap超出了系统对单张图片的限制大小5MB(5MB根据系统不同会有差别)。利用canve截图到的图才几十kb。如果利用常规的Matrix在原来的图基础上来放大(放大后的图片大小为原图大小*当前倍数的平方),就会有超限(5MB)溢出。


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import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.widget.ImageView.ScaleType;
/**
*此处函数是得到剪切的图片
* @author ZhangJianLin
*
*/
public class MyBitMap {
public MyBitMap() {
// TODO Auto-generated constructor stub
}
/**
*
* @param unscaledBitmap the bitmap of source
* @param dstWidth what width you want to set
* @param dstHeight What width you want to set
* @param scalingLogic it is ScaleType
* @return the scaled bitmap
*/
public static Bitmap createScaledBitmap(Bitmap unscaledBitmap, int dstWidth, int dstHeight, ScaleType scalingLogic) {
Rect srcRect = calculateSrcRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(), dstWidth, dstHeight, scalingLogic);
Rect dstRect = calculateDstRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(), dstWidth, dstHeight, scalingLogic);
Bitmap scaledBitmap = Bitmap.createBitmap(dstRect.width(), dstRect.height(), Config.ARGB_8888);
Canvas canvas = new Canvas(scaledBitmap);
canvas.drawBitmap(unscaledBitmap, srcRect, dstRect, new Paint(Paint.FILTER_BITMAP_FLAG));
return scaledBitmap;
}
//根据dstWOrH计算原图应该截取的截图合适的高宽比例图
public static Rect calculateSrcRect( int srcWidth, int srcHeight, int dstWidth, int dstHeight, ScaleType scalingLogic) {
if (scalingLogic == ScaleType.CENTER_CROP) {
final float srcAspect = ( float )srcWidth / ( float )srcHeight;
final float dstAspect = ( float )dstWidth / ( float )dstHeight;
if (srcAspect > dstAspect) {
final int srcRectWidth = ( int )(srcHeight * dstAspect);
final int srcRectLeft = (srcWidth - srcRectWidth) / 2 ;
return new Rect(srcRectLeft, 0 , srcRectLeft + srcRectWidth, srcHeight);
} else {
final int srcRectHeight = ( int )(srcWidth / dstAspect);
final int scrRectTop = ( int )(srcHeight - srcRectHeight) / 2 ;
return new Rect( 0 , scrRectTop, srcWidth, scrRectTop + srcRectHeight);
}
} else {
return new Rect( 0 , 0 , srcWidth, srcHeight);
}
}
//根据dstWOrH计算原图应该截取的期望图合适的高宽比例图
public static Rect calculateDstRect( int srcWidth, int srcHeight, int dstWidth, int dstHeight, ScaleType scalingLogic) {
if (scalingLogic == ScaleType.FIT_XY) {
final float srcAspect = ( float )srcWidth / ( float )srcHeight;
final float dstAspect = ( float )dstWidth / ( float )dstHeight;
if (srcAspect > dstAspect) {
return new Rect( 0 , 0 , dstWidth, ( int )(dstWidth / srcAspect));
} else {
return new Rect( 0 , 0 , ( int )(dstHeight * srcAspect), dstHeight);
}
} else {
return new Rect( 0 , 0 , dstWidth, dstHeight);
}
}
/**
*
* @param unscaledBitmap the bitmap of source
* @param scale the scale you want
* @param scalingLogic it is ScaleType
* @return the scaled bitmap
*/
//根据放大倍数获得截取图安scale放大的图
public static Bitmap createBMScaleBitmap(Bitmap unscaledBitmap, Double scale, ScaleType scalingLogic){
int dstWidth = ( int )(unscaledBitmap.getWidth()* scale);
int dstHeight = ( int )(unscaledBitmap.getHeight()*scale);
return createScaledBitmap(unscaledBitmap, dstWidth, dstHeight, scalingLogic);
}
}



移动截图起点规则

每缩放一次,就以图的中心为截获图的中心(Ox,Oy),起点为(Ox-needwidth/2,Oy - needhight/2)。

在缩放时,把放大后的图在逻辑上的坐标划分为m份,(1单位为屏幕的宽或高),同时每移动一次,就移动1/4份(即每次移动1/4屏幕)。(单次移动的宽或高像素为 (bitmapWidth/m*n或bitmapHight/m*n,其中n是缩放的倍数,m为计算缩放后的图片高宽跟屏幕对应的宽高的比例,以此得到的值作为x或y的坐标最大值,坐标单位为一个屏幕,每滑次移动半个屏幕或1/3屏幕

结合安卓的滑动或移动的灵敏度,能完美的模拟出效果图(亲测,如果移动规则用跟踪手的移动位移来移动图片是行不通的,不知道市面上能作出这样的效果是什么样的一个算法,还有待探究)
核心实现代码及注释如下

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package com.imageopen;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
public class BigzoonImage extends Activity {
ImageView myImageView;
Button bigButton; //放大按钮
Button smallButton; //缩小按钮
View myButtons;
private Bitmap myBitmap;
private double bigSize = 1.25 ; //每次放大的比列
private double smallSize = 0.8 ; //每次缩小的比例
double size = 1 ; //当前放大的倍数
double pixel = 30.00 ; //限制图片缩小时的最小像素
int bmpWidth; //图片宽度
int bmpHight; //图片高度
int bmpSizeWidth; //放大后的图片宽度bmpwidth*size
int bmpSizeHight;
int x ; //
int y ; //
int screenWidth; // 屏幕宽(像素,如:480px)
int screenHeight; // 屏幕高(像素,如:800px)
int dstHeight;
int dstWidth;
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super .onCreate(savedInstanceState);
setContentView(R.layout.bigzoonimage_main);
init();
}
private void init(){ //初始化各参数的值
myImageView = (ImageView)findViewById(R.id.bitmap_image);
bigButton = (Button)findViewById(R.id.button_big);
smallButton = (Button)findViewById(R.id.button_small);
myButtons = (View)findViewById(R.id.bitmap_button);
MyBitmapFactory myBitmapFactory = new MyBitmapFactory( this );
myBitmap = myBitmapFactory.getDrawBmp(R.drawable.bitmap_test); //事先加载一张图片
myImageView.setImageBitmap(myBitmap);
myImageView.setOnTouchListener(ImageOpenListener);
bigButton.setOnClickListener(sizeButton); //添加按钮触发事件
smallButton.setOnClickListener(sizeButton); //同上
DisplayMetrics dm = new DisplayMetrics(); //声明一个屏幕像素的类屏幕像素
dm = getResources().getDisplayMetrics(); //得到屏幕像素
screenWidth = dm.widthPixels; // 屏幕宽(像素,如:480px)
screenHeight = dm.heightPixels; // 屏幕高(像素,如:800px)
}
private void big(){ //放大时图片的变化
size = bigSize * size;
Bitmap newBitmap = myBitmap;
newBitmap = bigCal(myBitmap);
newBitmap = MyBitMap.createScaledBitmap(newBitmap, dstWidth, dstHeight, ScaleType.FIT_XY);
myImageView.setImageBitmap(newBitmap);
}
private void small(){ //缩小时图片的变化
size = smallSize * size;
Bitmap newBitmap = myBitmap; //得到原图的截取图
newBitmap = bigCal(newBitmap);
newBitmap = MyBitMap.createScaledBitmap(newBitmap, dstWidth, dstHeight, ScaleType.FIT_XY);
myImageView.setImageBitmap(newBitmap);
}
private OnClickListener sizeButton = new OnClickListener() { //放大缩小的事件
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (v == bigButton){
big();
}
else small();
}
};
//每缩放一次,就以图的中心为截获图的中心(Ox,Oy),起点为(Ox-needwidth/2,Oy - needhight/2),宽高为屏幕宽高的图。
public Bitmap bigCal(Bitmap bitmap){ //缩放得到原图的截取图
bmpWidth = bitmap.getWidth();
bmpHight = bitmap.getHeight();
//放大的size最小值,16是指限制的截取的图片最小像素,要是缩小的很小,那么一丁点没有意义,这里的16看个人意思
int sizeMax = Math.min(myBitmap.getWidth()/ 16 , myBitmap.getHeight()/ 16 ); //限定放大的最大倍数
double sizeMin = Math.max(pixel/myBitmap.getWidth(), pixel/myBitmap.getHeight()); //限制缩小的size最小倍数
if (size > sizeMax){
size = sizeMax;
}
if (size < sizeMin){
size = sizeMin;
}
bmpSizeWidth = ( int )(bmpWidth*size);
bmpSizeHight = ( int )(bmpHight*size);
if (screenWidth > bmpSizeWidth){
x = 0 ;
dstWidth = bmpSizeWidth;
} else {
x = ( int )((bmpSizeWidth - screenWidth)/( 2 *size));
bmpWidth = ( int )(screenWidth / size);
dstWidth = screenWidth;
}
if (screenHeight > bmpSizeHight){
y = 0 ;
dstHeight = bmpSizeHight;
} else {
y = ( int )((bmpSizeHight - screenHeight)/( 2 *size)); //放大时计算以中心的为截取中心的所要截图的左上点坐标(x,y)
bmpHight = ( int )(screenHeight / size);
dstHeight = screenHeight;
}
bitmap = Bitmap.createBitmap(bitmap, x, y, bmpWidth, bmpHight);
return bitmap;
}
//计算缩放的倍数跟屏幕的比例,以得到的值作为x或y的坐标最大值,坐标单位为一个屏幕,每滑动次移动半个屏幕或1/3屏幕
public double rowOrCowNum( int sizeBitmapWH, int screenWH){
double num = (sizeBitmapWH * size)/screenWH;
return num;
}
public Bitmap movCal(Bitmap bitmap, int dx, int dy){ //计算移动后的要截取的图
double coordinateX = rowOrCowNum(myBitmap.getWidth() , screenWidth); //缩放后x坐标,
double coordinateY = rowOrCowNum(myBitmap.getHeight(), screenHeight); //缩放后y的坐标
if (coordinateX > 1 ){
if (dx > 0 ){
x -= (myBitmap.getWidth()/(coordinateX * 4 ));
if (x < 0 ){
x = 0 ;
}
}
if (dx < 0 ){
x += (myBitmap.getWidth()/(coordinateX * 4 ));
if (x > (myBitmap.getWidth() - bmpWidth)){
x = myBitmap.getWidth() - bmpWidth;
}
}
}
if (coordinateY > 1 ){
if (dy > 0 ){
y -= (myBitmap.getHeight()/(coordinateY * 4 ));
if (y < 0 ){
y = 0 ;
}
}
if (dy < 0 ){
y += (myBitmap.getHeight()/(coordinateY * 4 ));
if (y > (myBitmap.getHeight() - bmpHight)){
y = myBitmap.getHeight() - bmpHight;
}
}
}
bitmap = Bitmap.createBitmap(bitmap, x, y, bmpWidth, bmpHight);
bitmap = MyBitMap.createScaledBitmap(bitmap, dstWidth, dstHeight, ScaleType.FIT_XY);
return bitmap;
}
private OnTouchListener ImageOpenListener = new OnTouchListener() { //移动监听
int lastX;
int lastY;
int left; //图片的左边界的坐标
int right; //图片右边界坐标
int top; //图片上边界的坐标
int bottom; //图片下边界的坐标
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
lastX = ( int )event.getRawX();
lastY = ( int )event.getRawY();
break ;
case MotionEvent.ACTION_MOVE:
int dx = ( int )event.getRawX() - lastX; //dx为在屏幕的x轴上移动的距离
int dy = ( int )event.getRawY() - lastY; //dy为在屏幕的y轴上移动的距离
Bitmap newBitmap;
//计算缩放的图片是否找出屏幕范围,如果是
if (bmpSizeWidth > screenWidth||bmpSizeHight > screenHeight){
if (bmpSizeWidth > screenWidth){
left = 0 ;
right = screenWidth;
} else {
left = v.getLeft() + dx;
right = v.getRight() + dx;
}
if (bmpSizeHight > screenHeight){
top = 0 ;
bottom = screenHeight;
} else {
top = v.getTop() + dy;
bottom = v.getBottom() + dy;
}
if ((dx > 3 || dx < - 3 ) && (dy > 3 ||dy < - 3 )){ //设置灵敏度,一定要设置
newBitmap = movCal(myBitmap, dx, dy);
myImageView.setImageBitmap(newBitmap);
}
}
else { //如果没有超出则移动ImageView
left = v.getLeft() + dx;
top = v.getTop() + dy;
bottom = v.getBottom() + dy;
right = v.getRight() + dx;
}
v.layout(left, top, right, bottom);
lastX = ( int )event.getRawX();
lastY = ( int )event.getRawY();
break ;
}
return true ;
}
};
@Override
protected void onPause() {
// TODO Auto-generated method stub
System.exit( 0 );
super .onPause();
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
System.exit( 0 );
super .onStop();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true ;
}
}


另外有一个辅助类,就是获取各类渠道图片的封装类

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import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Shader.TileMode;
import android.util.Base64;
/**
* 功能:得到原始的bitmap,就是unscaledbitmap;将得到bitmap字节流
* @author ZhangJianLin
*
*/
public class MyBitmapFactory {
Context context;
public MyBitmapFactory(Context context) {
// TODO Auto-generated constructor stub
this .context = context;
}
public Bitmap getFileBmp( String path){ //通过路径获得图片
Bitmap bm = BitmapFactory.decodeFile(path);
return bm;
}
public Bitmap getDrawBmp( int id){ //通过本项目id获得图片
Bitmap bm = BitmapFactory.decodeResource(context.getResources(), id);
return bm;
}
public Bitmap getStringBmp(InputStream inputstring){ //从流中获取图片
Bitmap bm = BitmapFactory.decodeStream(inputstring);
return bm;
}
public Bitmap getArrayBmp(byte[] data, int offset, int length){ //从字节转化成图片
Bitmap bm = BitmapFactory.decodeByteArray(data, offset, length);
return bm;
}
//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;
}
public Bitmap stringtoBitmap( String string){ //从string到bitmap
//将字符串转换成Bitmap类型
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;
}
public String bitmaptoString(Bitmap bitmap){
//将Bitmap转换成字符串
String string= null ;
ByteArrayOutputStream bStream= new ByteArrayOutputStream();
bitmap.compress(CompressFormat.PNG, 100 ,bStream);
byte[]bytes=bStream.toByteArray();
string=Base64.encodeToString(bytes,Base64.DEFAULT);
return string;
}
public Bitmap returnBitMap( String url) { //从网络中获得图片
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();
}
return bitmap;
}
}


本实验中所用到的布局如下

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< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
xmlns:tools = "http://schemas.android.com/tools"
android:layout_width = "match_parent"
android:layout_height = "match_parent"
tools:context = ".MainActivity" >
< ImageView
android:id = "@+id/bitmap_image"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_centerHorizontal = "true"
android:layout_centerVertical = "true"
android:src = "@drawable/ic_launcher" />
< LinearLayout
android:id = "@+id/bitmap_button"
android:layout_width = "80dp"
android:layout_height = "40dp"
android:layout_alignParentBottom = "true"
android:layout_alignParentLeft = "true"
android:layout_marginBottom = "16dp"
android:layout_marginLeft = "14dp"
android:orientation = "horizontal" >
< Button
android:id = "@+id/button_small"
android:layout_width = "40dp"
android:layout_height = "40dp"
android:background = "@drawable/bitmap_small" />
< Button
android:id = "@+id/button_big"
android:layout_width = "40dp"
android:layout_height = "40dp"
android:background = "@drawable/bitmap_big" />
LinearLayout >
RelativeLayout >


效果如下图

原图:




放大后



本实验有如下缺陷:(很容易改进)

1、移动时给用户的体验还不错。有一点点缺陷

2、放大时image边上有空白,这是因为计算截图时的误差

改进思路:

对于一、改进移动时的x,y及每次移动的算法规则;每次移动的距离为屏幕的1/m,提高m值,或用算法动态改变m值

对于二、当放大后的图像的宽高都大于屏幕的宽高,截获放大后的图设为全屏背景


源码地址http://pan.baidu.com/share/link?shareid=480398&uk=2065228996,编码是utf-8



本文出自 “lilin9105” 博客,请务必保留此出处http://7071976.blog.51cto.com/7061976/1208469

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