Android編程實現網絡圖片查看器和網頁源碼查看器實例

本文實例講述了Android編程實現網絡圖片查看器和網頁源碼查看器。分享給大家供大家參考，具體如下：

網絡圖片查看器

清單文加入網絡訪問權限：

<!-- 訪問internet權限 -->
<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);//獲取圖片數據
          if(data!=null){
            //構建位圖對象
            Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
            imageView.setImageBitmap(bitmap);//顯示圖片
          }else{
            Toast.makeText(getApplicationContext(), R.string.error, 1).show();
          }
        }catch (Exception e) {
          Toast.makeText(getApplicationContext(), R.string.error, 1).show();
        }
      }
    });
  }
}

public class ImageService {
  /**
   * 獲取圖片
   * @param path 網絡圖片路徑
   * @return 圖片的字節數據
   */
  public static byte[] getImage(String path) throws Exception{
    URL url = new URL(path);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    //設置超時時間
    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 {
  /**
   * 讀取輸入流數據
   * @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();
  }
}

網頁源碼查看器

如果網頁的源碼超過屏幕的顯示位置的話，要求出現滾動條.

<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{
      //獲取源碼
      String html = PageService.getHtml(path);
      htmlsource.setText(html);
    }catch (Exception e) {
      Toast.makeText(getApplicationContext(), R.string.error, 1).show();
    }
  }
});
}

public class PageService {
  /**
   * 獲取網頁源代碼
   * @param path 網頁路徑
   * @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;
  }
}

希望本文所述對大家Android程序設計有所幫助。