Android图片转换器代码分享
MainActivity.java
packagecom.zhang.showPhoto;
importandroid.app.ActionBar.LayoutParams;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.view.animation.AnimationUtils;
importandroid.widget.Button;
importandroid.widget.ImageSwitcher;
importandroid.widget.ImageView;
importandroid.widget.ViewSwitcher.ViewFactory;
publicclassMainActivityextendsActivity{
privateint[]imagId=newint[]{
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
};
privateintindex=0;
privateImageSwitcherimageSwitcher;
privateButtonup,down;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
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(newViewFactory(){
publicViewmakeView(){
ImageViewimageView=newImageView(MainActivity.this);
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
imageView.setLayoutParams(newImageSwitcher.LayoutParams(
LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT
));
returnimageView;
}
});
imageSwitcher.setImageResource(imagId[index]);
up.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
if(index>0){
index--;
}else{
index=imagId.length-1;
}
imageSwitcher.setImageResource(imagId[index]);
}
});
down.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
if(index<imagId.length-1){
index++;
}else{
index=0;
}
imageSwitcher.setImageResource(imagId[index]);
}
});
}
}
main.xml
<?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns: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.Optionsopt=newBitmapFactory.Options();
opt.inJustDecodeBounds=true;
try{
bitmapIn=BitmapFactory.decodeFile(Puzzle.user.CUSTOM_IMAGE[customImage],opt);
}catch(Exceptione){
if(D)Log.d(TAG,"error");
return;
}
intin_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
intSize_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);}