1.普通的下载方式
布局文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView android:src="@drawable/icon"
android:layout_width="wrap_content"
android:id="@+id/imgPic"
android:layout_gravity="center|center_vertical"
android:layout_height="fill_parent">
</ImageView>
</LinearLayout>
java文件:
public class DownloadImage extends Activity {
private ImageView imgPic;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.download_image);
imgPic = (ImageView) findViewById(R.id.imgPic);
String url = "图片文件地址"
loadRmoteImage(url);
}
/**
* @param imgUrl
* 远程图片文件的URL
*
* 下载远程图片
*/
private void loadRmoteImage(String imgUrl) {
URL fileURL = null;
Bitmap bitmap = null;
try {
fileURL = new URL(imgUrl);
} catch (MalformedURLException err) {
err.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) fileURL
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
int length = (int) conn.getContentLength();
if (length != -1) {
byte[] imgData = new byte[length];
byte[] buffer = new byte[512];
int readLen = 0;
int destPos = 0;
while ((readLen = is.read(buffer)) > 0) {
System.arraycopy(buffer, 0, imgData, destPos,
readLen);
destPos += readLen;
}
bitmap = BitmapFactory.decodeByteArray(imgData, 0,
imgData.length);
}
} catch (IOException e) {
e.printStackTrace();
}
imgPic.setImageBitmap(bitmap);
}