android 根据SD卡中图片路径读取并显示SD中的图片——源代码

package com.guo;import java.io.File;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageView;public class MainAct extends Activity {        /** Called when the activity is first created. */        private ImageView img;        //SD图片路径        private String filepath = "/sdcard/hot.png";        @Override        public void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState);                setContentView(R.layout.main);                img = (ImageView) findViewById(R.id.img);                File file = new File(filepath);                if (file.exists()) {                        Bitmap bm = BitmapFactory.decodeFile(filepath);                        //将图片显示到ImageView中                        img.setImageBitmap(bm);                }        }}

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