android中显示网络图片

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。

Java代码

packagecom.jinyan.image;
importjava.io.IOException;
importjava.io.InputStream;
importjava.net.HttpURLConnection;
importjava.net.MalformedURLException;
importjava.net.URL;
importandroid.app.Activity;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapFactory;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importandroid.widget.ImageView;
publicclassActivityMainextendsActivity{
/**Calledwhentheactivityisfirstcreated.*/
StringimageUrl="http://i.pbase.com/o6/92/229792/1/80199697.uAs58yHk.50pxCross_of_the_Knights_Templar_svg.png";
BitmapbmImg;
ImageViewimView;
Buttonbutton1;
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imView=(ImageView)findViewById(R.id.imview);
imView.setImageBitmap(returnBitMap(imageUrl));
}
publicBitmapreturnBitMap(Stringurl){
URLmyFileUrl=null;
Bitmapbitmap=null;
try{
myFileUrl=newURL(url);
}catch(MalformedURLExceptione){
e.printStackTrace();
}
try{
HttpURLConnectionconn=(HttpURLConnection)myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStreamis=conn.getInputStream();
bitmap=BitmapFactory.decodeStream(is);
is.close();
}catch(IOExceptione){
e.printStackTrace();
}
returnbitmap;
}
}

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代码

xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageViewandroid:id="@+id/imview"android:layout_width="wrap_content"
android:layout_height="wrap_content"android:layout_gravity="center"/>
LinearLayout>

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：

Xml代码

<uses-permissionandroid:name="android.permission.INTERNET"/>

<uses-permission android:name="android.permission.INTERNET" />

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