学步园

package com.example.saveimagetosdcard;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.view.Menu;
//1 注意权限
//2 仅为了测试,所以把此方法写到了MainActivity中

public class MainActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		this.getImageFromNetSaveToSDCard();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

	public void getImageFromNetSaveToSDCard() {
		try {
			Bitmap bitmap = null;
			InputStream inputStream = null;
			String imagePathString = "http://photocdn.sohu.com/20121109/Img357146253.jpg";
			URL imageUrl = new URL(imagePathString);
			HttpURLConnection httpURLConnection = (HttpURLConnection) imageUrl.openConnection();
			httpURLConnection.setConnectTimeout(5000);
			// httpURLConnection.setRequestMethod("POST");//设置为POST获取的图片大小为0
			httpURLConnection.setRequestMethod("GET");
			if (httpURLConnection.getResponseCode() == 200) {
				inputStream = httpURLConnection.getInputStream();
				// 利用InputStream生成bitmap
				bitmap = BitmapFactory.decodeStream(inputStream);
			}
			if (Environment.getExternalStorageState().equals(
					Environment.MEDIA_MOUNTED)) {
				// 在SD卡下建立文件夹
				String sdCardPath = Environment.getExternalStorageDirectory().toString();
				String folderName = "/haha";
				String imageFolderPath = sdCardPath + folderName;
				File imageFolder = new File(imageFolderPath);
				if (!imageFolder.exists()) {
					imageFolder.mkdirs();
				}
				// 在SD卡下的文件夹中保存图片
				String everyImagedetailPath = imageFolder.toString()+ "/man.jpg";
				File everyImageFile = new File(everyImagedetailPath);
				if (everyImageFile.createNewFile()) {// 创建文件成功
					FileOutputStream outputStream = new FileOutputStream(everyImageFile);
					bitmap.compress(CompressFormat.JPEG, 80, outputStream);
					outputStream.flush();
					outputStream.close();
				} else {
					System.out.println("保存图片失败");
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}