Android图片转换器代码分享
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2024-03-06 15:47:26
mainactivity.java
package com.zhang.showphoto;
import android.app.actionbar.l...
mainactivity.java
package com.zhang.showphoto; import android.app.actionbar.layoutparams; import android.app.activity; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.view.animation.animationutils; import android.widget.button; import android.widget.imageswitcher; import android.widget.imageview; import android.widget.viewswitcher.viewfactory; public class mainactivity extends activity { private int[] imagid=new int[]{ r.drawable.img01,r.drawable.img02,r.drawable.img03,r.drawable.img04, r.drawable.img05,r.drawable.img06,r.drawable.img07,r.drawable.img08, r.drawable.img09,r.drawable.img10 }; private int index=0; private imageswitcher imageswitcher; private button up,down; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); up=(button) findviewbyid(r.id.bt1); down=(button) findviewbyid(r.id.bt2); imageswitcher=(imageswitcher) findviewbyid(r.id.imagsw1); imageswitcher.setinanimation(animationutils.loadanimation(this, android.r.anim.fade_in)); imageswitcher.setoutanimation(animationutils.loadanimation(this, android.r.anim.fade_out)); imageswitcher.setfactory(new viewfactory() { public view makeview() { imageview imageview = new imageview(mainactivity.this); imageview.setscaletype(imageview.scaletype.fit_center); imageview.setlayoutparams(new imageswitcher.layoutparams( layoutparams.wrap_content,layoutparams.wrap_content )); return imageview; } }); imageswitcher.setimageresource(imagid[index]); up.setonclicklistener(new onclicklistener() { @override public void onclick(view v) { if(index>0){ index--; }else{ index=imagid.length-1; } imageswitcher.setimageresource(imagid[index]); } }); down.setonclicklistener(new onclicklistener() { @override public void onclick(view v) { if(index<imagid.length-1){ index++; }else{ index=0; } imageswitcher.setimageresource(imagid[index]); } }); } }
main.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:background="@drawable/bg1" android:id="@+id/llayout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center" android:orientation="horizontal" > <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="上一张" android:id="@+id/bt1" /> <imageswitcher android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/imagsw1" android:layout_gravity="center" /> <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下一张" android:id="@+id/bt2" /> </linearlayout>
再来看一段代码
// 获取图片的宽高 bitmapfactory.options opt = new bitmapfactory.options(); opt.injustdecodebounds = true; try{ bitmapin = bitmapfactory.decodefile(puzzle.user.custom_image[customimage], opt); }catch(exception e){ if(d) log.d(tag,"error"); return; } int in_w=opt.outwidth,in_h=opt.outheight; // 获取imageview的尺寸 注意imageview的宽高比要与原图相同 否则需要另行计算 full_w = imageview.getwidth() full_h = getheight() // 计算缩放比例 带有四舍五入 int size_rate=(in_w*in_h*10)/(full_w*full_h); if(size_rate>10){ size_rate+=5; size_rate/=10; }else{ size_rate=1; } // 重新设置opt 读取图片文件 opt.insamplesize=size_rate; opt.injustdecodebounds = false; opt.inscaled = false; opt.outwidth=full_w; opt.outheight=full_h; bitmapin = bitmapfactory.decodefile(puzzle.user.custom_image[customimage], opt);}