Actividad principal.java
paquete com.zhang.showPhoto; importar android.app.ActionBar.LayoutParams; importar android.app.Activity; importar android.os.Bundle; importar android.view.View; importar android.view.View.OnClickListener; importar android.view.animation.AnimationUtils; importar android .widget.Button;importar android.widget.ImageSwitcher;importar android.widget.ImageView;importar android.widget.ViewSwitcher.ViewFactory; clase pública MainActivity extiende la actividad {privado int[] imagId=new int[]{ R.drawable.img01,R.drawable.img02,R.drawable.img03,R.drawable.img04, R.drawable.img05,R.drawable .img06,R.dibujable.img07,R.dibujable.img08, R.drawable.img09,R.drawable.img10 }; índice int privado = 0; ImageSwitcher privado ImageSwitcher; Botón privado arriba, abajo; @Override protected void onCreate(Bundle saveInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); arriba=(Botón) findViewById(R.id.bt1); abajo=(Botón) findViewById(R.id.bt2); imageSwitcher=(ImageSwitcher) findViewById(R.id.imagSw1); imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(esto, android.R.anim.fade_in)); imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(esto, android.R.anim.fade_out)); imageSwitcher.setFactory(new ViewFactory() { Vista pública makeView() { ImageView imageView = nuevo ImageView(MainActivity.this); imageView.setScaleType(ImageView.ScaleType.FIT_CENTER); imageView.setLayoutParams(nuevo ImageSwitcher.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT )); devolver imagenVer; imageSwitcher.setImageResource(imagId[índice]); 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]); } }); } }principal.xml
<?xml versión="1.0" codificación="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="centro" android:orientation="horizontal" > <Botón 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" /> <Botón 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 = verdadero; probar{ bitmapIn = BitmapFactory.decodeFile(Puzzle.user.CUSTOM_IMAGE[customImage], optar); }catch(Exception e){ if(D) Log.d(TAG,"error"); devolver; } 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(Tasa_tamaño>10){ Tasa_tamaño+=5; Tasa_tamaño/=10; }de lo contrario{ Size_rate=1; } // 重新设置opt 读取图片文件 opt.inSampleSize=Size_rate; opt.inJustDecodeBounds = falso; opt.inScaled = falso; opt.outWidth=full_w; opt.outHeight=full_h; bitmapIn = BitmapFactory.decodeFile(Puzzle.user.CUSTOM_IMAGE[imagen personalizada], optar);}