Android编程实现网络图片查看器和网页源码查看器实例

本文实例讲述了Android编程实现网络图片查看器和网页源码查看器。分享给大家供大家参考，具体如下：

网络图片查看器

清单文加入网络访问权限：

<!-- 访问internet权限 -->
<uses-permission android:name="android.permission.INTERNET"/>

界面如下：

示例：

public class MainActivity extends Activity {
 private EditText imagepath;
 private ImageView imageView;
 @Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
   imagepath = (EditText) this.findViewById(R.id.imagepath);
   imageView = (ImageView) this.findViewById(R.id.imageView);
   Button button = (Button) this.findViewById(R.id.button);
   button.setOnClickListener(new View.OnClickListener() {
     public void onClick(View v) {
       String path = imagepath.getText().toString();
       try{
         byte[] data = ImageService.getImage(path);//获取图片数据
         if(data!=null){
           //构建位图对象
           Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
           imageView.setImageBitmap(bitmap);//显示图片
         }else{
           Toast.makeText(getApplicationContext(), R.string.error, 1).show();
         }
       }catch (Exception e) {
         Toast.makeText(getApplicationContext(), R.string.error, 1).show();
       }
     }
   });
 }
}

public class ImageService {
 /**
  * 获取图片
  * @param path 网络图片路径
  * @return 图片的字节数据
  */
 public static byte[] getImage(String path) throws Exception{
   URL url = new URL(path);
   HttpURLConnection conn = (HttpURLConnection) url.openConnection();
   //设置超时时间
   conn.setConnectTimeout(5000);
   conn.setRequestMethod("GET");
   if(conn.getResponseCode()==200){
     InputStream inStream = conn.getInputStream();
     byte[] data = StreamTool.read(inStream);
     return data;
   }
   return null;
 }
}

public class StreamTool {
 /**
  * 读取输入流数据
  * @param inStream
  * @return
  */
 public static byte[] read(InputStream inStream) throws Exception{
   ByteArrayOutputStream outStream = new ByteArrayOutputStream();
   byte[] buffer = new byte[1024];
   int len = 0;
   while( (len = inStream.read(buffer)) != -1 ){
     outStream.write(buffer, 0, len);
   }
   inStream.close();
   return outStream.toByteArray();
 }
}

网页源码查看器

如果网页的源码超过屏幕的显示位置的话，要求出现滚动条.

<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/htmlsource"
/>
</ScrollView>

界面如下：

示例

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  pathText = (EditText) this.findViewById(R.id.path);
  htmlsource = (TextView) this.findViewById(R.id.htmlsource);
  Button button = (Button) this.findViewById(R.id.button);
  button.setOnClickListener(new View.OnClickListener() {
 public void onClick(View v) {
   String path = pathText.getText().toString();
   try{
     //获取源码
     String html = PageService.getHtml(path);
     htmlsource.setText(html);
   }catch (Exception e) {
     Toast.makeText(getApplicationContext(), R.string.error, 1).show();
   }
 }
});
}

public class PageService {
 /**
  * 获取网页源代码
  * @param path 网页路径
  * @return
  */
 public static String getHtml(String path) throws Exception{
   URL url = new URL(path);
   HttpURLConnection conn = (HttpURLConnection) url.openConnection();
   conn.setConnectTimeout(5000);
   conn.setRequestMethod("GET");
   if(conn.getResponseCode() == 200){
     byte[] data = StreamTool.read(conn.getInputStream());
     return new String(data, "UTF-8");
   }
   return null;
 }
}

希望本文所述对大家Android程序设计有所帮助。