图片的缩放处理

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package com.sanya.largeimage;    import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.BitmapFactory.Options; import android.graphics.Point; import android.os.Bundle; import android.view.View; import android.view.WindowManager; import android.widget.ImageView;    public class MainActivity extends Activity {     private ImageView lv;     private WindowManager wm;     private Point outSize;        @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         lv = (ImageView) this.findViewById(R.id.lv);         wm = (WindowManager) getSystemService(WINDOW_SERVICE);         outSize = new Point();        }               public void click(View view) {         //新版的api        /*  wm.getDefaultDisplay().getSize(outSize);         int windowHeight = outSize.y;         int windowWidth = outSize.x; */         //旧版的api          int windowHeight = wm.getDefaultDisplay().getHeight();          int  windowWidth = wm.getDefaultDisplay().getWidth();                       BitmapFactory.Options opts = new Options();         // 设置 不去真正的解析位图 不把他加载到内存 只是获取这个图片的宽高信息         opts.inJustDecodeBounds = true;         BitmapFactory.decodeFile("/sdcard/a.jpg", opts);            int width = opts.outWidth;         int height = opts.outWidth;         if (width > windowWidth || height > windowHeight) {             int x = width / windowWidth;             int y = height / windowHeight;             opts.inSampleSize = x > y ? x : y;         } else {                opts.inSampleSize = 1;         }         // 让位图工厂真正的去解析图片         opts.inJustDecodeBounds = false;         Bitmap file = BitmapFactory.decodeFile("/sdcard/a.jpg", opts);         lv.setImageBitmap(file);        } }

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