在android 當中顯示一張網絡圖片的時候,其實是比較麻煩的。首先得把這個網絡圖片轉換成java的imputstream流,然後再把這個留轉換成一個bitMap.
bitMap是可以作爲參數傳給imageView的。
在下邊的returnBitMap函數是最核心的,也是大家可以重用的,它負責把一個url的網絡圖片變成一個本地的BitMap。
package com.jinyan.image;
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.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class ActivityMain extends Activity {
/** Called when the activity is first created. */
String imageUrl = "http://i.pbase.com/o6/92/229792/1/80199697.uAs58yHk.50pxCross_of_the_Knights_Templar_svg.png";
Bitmap bmImg;
ImageView imView;
Button button1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imView = (ImageView) findViewById(R.id.imview);
imView.setImageBitmap(returnBitMap(imageUrl));
}
public Bitmap returnBitMap(String url) {
URL myFileUrl = null;
Bitmap bitmap = null;
try {
myFileUrl = new URL(url);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
} catch (IOException e) {
e.printStackTrace();
}
return bitmap;
}
}
< 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:id="@+id/imview" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_gravity="center" />
LinearLayout>
注意,想要讓你的程序 可以訪問網絡,你必須在menifest文件裏邊增加:
< uses-permission android:name="android.permission.INTERNET" />