Shulou(Shulou.com)06/03 Report--

Editor to share with you how Android uses the webView long button to save and download network pictures, I believe most people don't know much about it, so share this article for your reference. I hope you will gain a lot after reading this article. Let's learn about it together.

Recently, it is found that WebView.HitTestResult can be obtained in the setOnLongClickListener of webView, and different processing can be done according to the Type of the acquired HitTestResult. Get the url of clicking on the picture by judging the type of Type, then download the picture to the local, send a broadcast to inform the system library to update, and view the downloaded picture in the system library. Run Demo and click on the picture on the web page to download the web picture.

Go directly to the code:

Package demo.sam.webview_demo; import android.app.Activity; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.net.Uri; import android.os.Handler; import android.os.Message; import android.provider.MediaStore; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.text.Editable; import android.util.Log; import android.view.KeyEvent; import android.view.View Import android.webkit.WebChromeClient; import android.webkit.WebResourceRequest; import android.webkit.WebSettings; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.Button; import android.widget.EditText; import android.widget.ProgressBar; import android.widget.Toast; import java.io.FileNotFoundException; public class MainActivity extends Activity {private ProgressBar progress; private WebView webView; private EditText editText; private Button click; private Context context; @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState) SetContentView (R.layout.activity_main); context= this; initView (); initData (); initListener ();} private void initData () {WebSettings settings = webView.getSettings (); settings.setJavaScriptEnabled (true); settings.setUseWideViewPort (true); / / set this property to scale settings.setLoadWithOverviewMode (true) at any scale; / / make the page support scaling settings.setBuiltInZoomControls (true); settings.setSupportZoom (true) / support automatic loading of settings.setLoadsImagesAutomatically (true); settings.setLayoutAlgorithm (WebSettings.LayoutAlgorithm.NORMAL); / / typesetting to fit the screen / / Zoom button settings.setDisplayZoomControls (false); webView.setWebViewClient (new WebViewClient () {/ / Page Jump @ Override public boolean shouldOverrideUrlLoading (WebView view, WebResourceRequest request) {return super.shouldOverrideUrlLoading (view, request) } / / Page loading ends @ Override public void onPageFinished (WebView view, String url) {super.onPageFinished (view, url); if (roomsloading null) {progress.setVisibility (View.GONE);});} private void initView () {progress = (ProgressBar) findViewById (R.id.progress); webView = (WebView) findViewById (R.id.webView); editText = (EditText) findViewById (R.id.url) Click = (Button) findViewById (R.id.click);} private void initListener () {/ / Web page loading progress shows webView.setWebChromeClient (new WebChromeClient () {@ Override public void onProgressChanged (WebView view, int newProgress) {super.onProgressChanged (view, newProgress); progress.setVisibility (View.VISIBLE); progress.setProgress (newProgress);}}) Click.setOnClickListener (new View.OnClickListener () {@ Override public void onClick (View view) {Log.e ("website entered", editText.getText (). ToString (). Trim ()); webView.loadUrl (editText.getText (). ToString (). Trim ());}}) / / long click event webView.setOnLongClickListener (new View.OnLongClickListener () {@ Override public boolean onLongClick (View view) {final WebView.HitTestResult hitTestResult = webView.getHitTestResult () / / if it is a picture type or a type with a picture link if (hitTestResult.getType () = = WebView.HitTestResult.IMAGE_TYPE | | hitTestResult.getType () = = WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {/ / the dialog box AlertDialog.Builder builder = new AlertDialog.Builder (context) pops up to save the picture; builder.setTitle ("prompt"); builder.setMessage ("Save picture to local") Builder.setPositiveButton ("confirm", new DialogInterface.OnClickListener () {@ Override public void onClick (DialogInterface dialogInterface, int I) {String url = hitTestResult.getExtra () / / download pictures to local DownPicUtil.downPic (url, new DownPicUtil.DownFinishListener () {@ Override public void getDownPath (String s) {Toast.makeText (context, "download completed", Toast.LENGTH_LONG) .show (); Message msg = Message.obtain (); msg.obj=s; handler.sendMessage (msg);}}) ); builder.setNegativeButton ("cancel", new DialogInterface.OnClickListener () {/ / automatic dismiss @ Override public void onClick (DialogInterface dialogInterface, int I) {}}); AlertDialog dialog = builder.create (); dialog.show ();} return true;}}); webView.loadUrl ("http://www.baidu.com");" } Handler handler = new Handler () {@ Override public void handleMessage (Message msg) {super.handleMessage (msg); String picFile = (String) msg.obj; String [] split = picFile.split ("/"); String fileName = split [split.length-1]; try {MediaStore.Images.Media.insertImage (getApplicationContext (). GetContentResolver (), picFile, fileName, null);} catch (FileNotFoundException e) {e.printStackTrace () } / / finally notify the gallery to update getApplicationContext () .sendBroadcast (new Intent (Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse ("file://" + picFile); Toast.makeText (context," Picture Save Gallery successfully ", Toast.LENGTH_LONG) .show ();}} / / listen for the return key to return to the upper layer of the web page @ Override public boolean onKeyDown (int keyCode, KeyEvent event) {if (keyCode = = KeyEvent.KEYCODE_BACK & & webView.canGoBack ()) {if (webView! = null) {webView.goBack (); return true;}} return super.onKeyDown (keyCode, event);}}

Tool class for downloading pictures

Import android.os.AsyncTask; import android.os.Environment; import android.util.Log; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.URL; import java.util.Random / * tools for downloading pictures * / public class DownPicUtil {/ * download pictures and return the address of the pictures * @ param url * / public static void downPic (String url,DownFinishListener downFinishListener) {/ / get the directory of the memory card String filePath = Environment.getExternalStorageDirectory (). GetPath (); File file = new File (filePath+File.separator+ "webViewCache"); if (! file.exists ()) {file.mkdir () } loadPic (file.getPath (), url,downFinishListener);} private static void loadPic (final String filePath, final String url, final DownFinishListener downFinishListener) {Log.e ("url for downloading pictures", url); new AsyncTask () {String fileName; InputStream is; OutputStream out; @ Override protected String doInBackground (Void...) Voids) {/ / the name of the download file String [] split = url.split ("/"); String newString = split [split.length-1]; fileName = newString.substring (newString.length ()-20) newString.length ()-1); / / create the target file, not the folder File picFile = new File (filePath + File.separator + fileName); if (picFile.exists ()) {return picFile.getPath () } try {URL picUrl = new URL (url); / / Open the input stream is= picUrl.openStream () through the link to the picture; if (is==null) {return null;} out = new FileOutputStream (picFile); byte [] b=new byte [1024]; int end; while ((end=is.read (b))! =-1) {out.write } Log.e ("OK??", "-"); if (isometric null) {is.close ();} if (outdated null) {out.close ();}} catch (FileNotFoundException e) {e.printStackTrace ();} catch (IOException e) {e.printStackTrace ();} return picFile.getPath () } @ Override protected void onPostExecute (String s) {super.onPostExecute (s); if (sluggish null) {downFinishListener.getDownPath (s);}. Execute ();} / / download the callback interface public interface DownFinishListener {void getDownPath (String s);}} above is all the content of the article "how to use webView long button to save and download network pictures". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.