加载大图片代码片段

package com.tang.bigpic;import android.app.Activity;import android.app.ActionBar;import android.app.Fragment;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.BitmapFactory.Options;import android.graphics.Point;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.ImageView;import android.os.Build;public class MainActivity extends Activity {	private ImageView iv;	private int screeX;	private int screeY;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		iv = (ImageView) findViewById(R.id.pic);		WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);		screeY = wm.getDefaultDisplay().getHeight();		screeX = wm.getDefaultDisplay().getWidth();		//Point outSize = new Point();		//wm.getDefaultDisplay().getSize(outSize);		//outSize.x;		//outSize.y;	}		public void getPic(View view)	{		String path = "/data/data/com.look.pic/test.jpg";		//Bitmap bm = BitmapFactory.decodeFile("/data/data/com.look.pic/test.jpg");		//iv.setImageBitmap(bm);		BitmapFactory.Options opts = new Options();		//并不是真正的去解析图片只是读取图片的相关信息；		opts.inJustDecodeBounds = true;		BitmapFactory.decodeFile(path, opts);		int hegiht = opts.outHeight;		int width = opts.outWidth;		//计算缩放比例		int scaleX = width/screeX;		int scaleY = hegiht/screeY;				int scale = 1;		if (scaleX > scaleY & scaleX > 1) {			scale = scaleX;		}		if (scaleY > scaleX & scaleY > 1) {			scale = scaleY;		}		opts.inJustDecodeBounds = false;		opts.inSampleSize = scale;		Bitmap bm = BitmapFactory.decodeFile(path, opts);		iv.setImageBitmap(bm);	}}