Android(安卓)实现图片的自动缩放，适应分辨率不同的手机

以下代码可实现Android图片按照不同屏幕手机的大小比例缩放。

1、定义 bitmap

public Bitmap viewBg;// 背景图

2、给他图片资源

viewBg = BitmapFactory.decodeResource(res, R.drawable.shuaibao_bg);

3、就是正事了，自己看吧

canvas.save();
Matrix matrix=new Matrix();
int width = viewBg.getWidth();//获取资源位图的宽
int height = viewBg.getHeight();//获取资源位图的高
float w = scalX/viewBg.getWidth();
float h = scalY/viewBg.getHeight();
matrix.postScale(w, h);//获取缩放比例
Bitmap dstbmp = Bitmap.createBitmap(viewBg,0,0,
width,height,matrix,true);//根据缩放比例获取新的位图
canvas.drawBitmap(dstbmp,0,0, mPaint); //在屏幕上画出位图
canvas.restore();

下面是最全面的代码：

[java] view plain copy

importandroid.content.Context;
importandroid.content.Intent;
importandroid.content.res.Resources;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapFactory;
importandroid.graphics.Canvas;
importandroid.graphics.Matrix;
importandroid.graphics.Paint;
importandroid.view.SurfaceHolder;
importandroid.view.SurfaceView;
importcn.com.ldci.madc.firecrackers.R;
importcn.com.ldci.madc.firecrackers.ui.shuaibao.ShuaiBaoActivity;
publicclassShuaiBaoViewextendsSurfaceViewimplementsSurfaceHolder.Callback{
ShuaiBaoActivitymain=newShuaiBaoActivity();
//状态
publicfinalstaticintSTART=0;//摔炮开始运动
publicfinalstaticintPAUSE=1;//软件暂停
publicfinalstaticintHIT=2;//定义摔炮撞墙是的状态
//监听软件状态
publicintstate=PAUSE;
//定义图片
publicBitmapimgBao;
publicBitmapimgBaoend;
publicBitmapimgBaobg;
Bitmapdstbmp;
//privateAnimationmAnimationTranslate;//定义平移的动画
//定义摔炮位置
publicintx;
publicinty;
intinitX;
publicintinitY;
privatefloatscalX;
privatefloatscalY;
//定义摔炮运行速度
publicintspeed=15;
//定义线程的运行参数
publicbooleanisStop=true;
SurfaceHolderholder;
Intentintent;
Contextcontext;
publicShuaiBaoView(Contextcontext,intx,inty){
super(context);
//TODOAuto-generatedconstructorstub
this.context=context;
initY=y-30;//初始化摔炮y轴初始坐标
this.x=x/2-5;;//初始化摔炮x轴坐标
this.y=initY;//初始化摔炮Y周卓表
scalX=x;//保存屏幕宽
scalY=y;//保存屏幕高
holder=getHolder();//获取holder
holder.addCallback(this);
Resourcesres=context.getResources();
imgBao=BitmapFactory.decodeResource(res,R.drawable.shuaibao_bao);
imgBaoend=BitmapFactory.decodeResource(res,R.drawable.shuaipao_baoend);
imgBaobg=BitmapFactory.decodeResource(res,R.drawable.shuaibao_bg);
Matrixmatrix=newMatrix();
matrix.postScale(scalX/imgBaobg.getWidth(),
scalY/imgBaobg.getHeight());//获取缩放比例
dstbmp=Bitmap.createBitmap(imgBaobg,0,0,imgBaobg.getWidth(),
imgBaobg.getHeight(),matrix,true);//按缩放比例生成适应屏幕的新的bitmap；
intent=newIntent("com.soundmanagerbao.android.music");
setFocusable(true);
}
publicvoidonDraw(Canvascanvas){
super.onDraw(canvas);
//绘制图片
canvas=holder.lockCanvas(null);//获取画布
PaintmPaint=newPaint();//获取画笔
//画自适应背景
canvas.save();
canvas.drawBitmap(dstbmp,0,0,mPaint);//画出图片
canvas.restore();
switch(state){
casePAUSE:{//暂停
canvas.save();
canvas.drawBitmap(imgBao,x,initY,mPaint);
canvas.restore();
}
break;
caseSTART://开始
{
canvas.save();
canvas.drawBitmap(imgBao,x,y,mPaint);
canvas.restore();
y-=speed;
if(y<=120){
state=HIT;
}
}
break;
caseHIT:{//撞击
canvas.save();
canvas.drawBitmap(imgBaoend,x,115,mPaint);
canvas.drawBitmap(imgBaoend,x,115,mPaint);
canvas.restore();
context.startService(intent);
state=PAUSE;
}
break;
}
holder.unlockCanvasAndPost(canvas);
}
classMyThreadimplementsRunnable{//画图，刷新
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
while(isStop){
Canvascanvas1=null;
onDraw(canvas1);
}
}
}
@Override
publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,
intheight){
//TODOAuto-generatedmethodstub
}
@Override
publicvoidsurfaceCreated(SurfaceHolderholder){
//TODOAuto-generatedmethodstub
isStop=true;
newThread(newMyThread()).start();//开始线程
}
@Override
publicvoidsurfaceDestroyed(SurfaceHolderholder){
//TODOAuto-generatedmethodstub
isStop=false;//返回时关闭线程
}
}

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