[Android] Network picture Viewer

Interface Layout linerlayout linear layout,ImageView controls,EditText controls hint Property Tip information, Button control.

android:layout_weight= "" attribute, weight, only when the width and height of the control is 0 to represent the weight, otherwise it represents the priority of the rendering, the higher the value of the lower priority, the default is 0 , the other controls are rendered first

Singleline Property Line

Business logic, get EditText values into ImageView , essentially http get Request

Gets the EditText object, via Findviewbyid ()

Gets the value that calls the toString () method by calling the GetText () method of the EditText object, calling the trim () method

Call the IsEmpty () method of the Textutils class to determine whether it is empty and Toast

Send a get request

Gets the URL object, via the new URL (path), parameter:path is a String the path where the exception needs to be caught

Gets the httpurlconnection object, which is returned by invoking the OpenConnection () method of the Url object. URLConnection object, and then force the type to convert a bit

Call the httpurlconnection object's Setrequestmethod method, set the request method, is GET

Call the setconnecttimeout (Millis) of the httpurlconnection Object, set the time-out,Millis is milliseconds

Call the setrequestproperty (field,newvalue) method of the HttpURLConnection object , set the request parameters, such as the request header, user-agent wait

Call the httpurlconnection object's getresponsecode () method to get the server's response code,

Invokes the getInputStream () method of the httpurlconnection object , gets the input stream, and returns the InputStream Object

Call the Decodestream (IS) method of the Bitmapfactory class to get the Bitmap object, Parameters: is is a InputStream Object

Call the setimagebitmap (bitmap) method of the ImageView object to set the picture, parameter:bitmap Object

All access to the network need to add permissions Android.permission.INTERNET

At this point, the direct deployment, will be reported an error networkonmainthreadexception, does not allow network operation on the main thread, the following code only valid when the lower version

 PackageCom.tsh.internetpic;ImportJava.io.InputStream;Importjava.net.HttpURLConnection;ImportJava.net.URL;Importandroid.app.Activity;ImportAndroid.graphics.Bitmap;Importandroid.graphics.BitmapFactory;ImportAndroid.os.Bundle;Importandroid.text.TextUtils;ImportAndroid.view.View;ImportAndroid.widget.EditText;ImportAndroid.widget.ImageView;ImportAndroid.widget.Toast; Public classMainactivityextendsActivity {PrivateEditText Et_path; PrivateImageView Iv_pic; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); Et_path=(EditText) Findviewbyid (R.id.et_path); Iv_pic=(ImageView) Findviewbyid (r.id.iv_pic); }     Public voidgetinternetimg (View v) {String path=Et_path.gettext (). toString (). Trim (); if(Textutils.isempty (path)) {Toast.maketext ( This, "Picture path cannot be empty", 0). Show (); }Else{            Try{URL URL=NewURL (path); HttpURLConnection Conn=(HttpURLConnection) url.openconnection (); Conn.setrequestmethod ("GET"); Conn.setconnecttimeout (5000); Conn.setrequestproperty ("User-agent", "" "); intCode=Conn.getresponsecode (); if(code==200) {InputStream is=Conn.getinputstream (); Bitmap BP=Bitmapfactory.decodestream (IS);                Iv_pic.setimagebitmap (BP); }Else{Toast.maketext ( This, "Network connection timed out", 0). Show (); }            } Catch(Exception e) {e.printstacktrace (); }        }    }}

[Android] Network picture Viewer