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：
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<!-- 訪問internet權限 --><uses-permission android:name="android.permission.internet"/> |
界面如下：
示例：
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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(); } } }); }} |
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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; }} |
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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.
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<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
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@overridepublic 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(); } }});} |
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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。
