Android将网上图片存储到sdcard中并显示出来的源码

package pic.com; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import android.app.Activity; import android.content.Intent; import android.graphics.*; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.View; import android.widget.*; public class Activity01 extends Activity { private final String TAG="Activity01"; private EditText mEditText; private Button btn1; private Button btn2; private TextView info; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mEditText=(EditText)findViewById(R.id.edit); btn1=(Button)findViewById(R.id.download_Btn);//下载按钮 btn2=(Button)findViewById(R.id.show_pic);//显示图按钮 ///为显示按钮设置监听,保存url的数据 btn2.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { Intent intent=new Intent(); intent.setClass(Activity01.this, A1.class); startActivity(intent); Activity01.this.finish();//结束 } }); /////下载图片 btn1.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))//判断是否可以对SDcard进行操作 { String url=mEditText.getText().toString().trim(); String fileName=url.substring(url.lastIndexOf('/')+1,url.length());//提取下载图片的文件名 Bitmap bitmap=GetNetBitmap(url);//得到bitmap String sdCardDir = Environment.getExternalStorageDirectory()+"/hekui/";//获取SDCard目录 File file = new File(sdCardDir,fileName);//在SDcard的目录下创建图片文件 try //将网络上读取的图片保存到SDCard中 { FileOutputStream out=new FileOutputStream(file);//为图片文件实例化输出流 if(bitmap.compress(Bitmap.CompressFormat.PNG, 100, out))//对图片保存 { out.flush(); Log.v(TAG,"Success"); out.close(); info=(TextView)findViewById(R.id.textView1); info.setText(fileName+" 下载成功！！"); } } catch (FileNotFoundException e) { Log.v(TAG,"文件没发现！！"); e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); Log.v(TAG,"数据流错误！！"); } } } }); } /////取得网络上的图片 public Bitmap GetNetBitmap(String url) { URL imageUrl = null; Bitmap bitmap=null; try { imageUrl = new URL(url); } catch (MalformedURLException e) { Log.v(TAG, e.getMessage()); } if (imageUrl != null) { try { HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection(); conn.setDoInput(true);// 设置请求的方式 conn.connect(); InputStream is = conn.getInputStream();// 将得到的数据转化为inputStream bitmap = BitmapFactory.decodeStream(is);// 将inputstream转化为Bitmap is.close();// 关闭数据 } catch (IOException e) { e.printStackTrace(); } } else { Log.v(TAG,"Url is Null!!"); } return bitmap; } }