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);
}
}
}