在android当中显示一张网络图片的时候,其实是比较麻烦的。首先得把这个网络图片转换成java的imputstream流,然后再把这个留转换成一个bitMap.
bitMap是可以作为参数传给imageView的。
在下边的returnBitMap函数是最核心的,也是大家可以重用的,它负责把一个url的网络图片变成一个本地的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,想要让你的程序可以访问网络,你必须在menifest文件里边增加:
<uses-permission android:name="android.permission.INTERNET" />