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2023-07-27
Android图片转换器代码分享
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.setOutAhttp://nimation(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 index++; }else{ index=0; } imageSwitcher.setImageResource(imagId[index]); } }); } } main.xml android:background="@drawable/bg1" android:id="@+id/llayout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center" android:orientation="horizontal" > 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);}
index++;
}else{
index=0;
}
imageSwitcher.setImageResource(imagId[index]);
}
});
}
}
main.xml
android:background="@drawable/bg1" android:id="@+id/llayout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center" android:orientation="horizontal" > android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="上一张" android:id="@+id/bt1" /> android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/imagSw1" android:layout_gravity="center" /> android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下一张" android:id="@+id/bt2" />
android:background="@drawable/bg1"
android:id="@+id/llayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="horizontal" >
android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="上一张" android:id="@+id/bt1" /> android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/imagSw1" android:layout_gravity="center" /> android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下一张" android:id="@+id/bt2" />
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上一张"
android:id="@+id/bt1"
/>
android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/imagSw1" android:layout_gravity="center" /> android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下一张" android:id="@+id/bt2" />
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imagSw1"
android:layout_gravity="center"
/>
android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下一张" android:id="@+id/bt2" />
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下一张"
android:id="@+id/bt2"
/>
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);}
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