Android developers use WebView to identify H5 pictures and save them to album (mobile phone, tablet adaptation, avoid saving pictures twice)

The article directories

• • preface
  • Step1: WebView adds the long press event
  • Step2: Pop up the bottom dialog box for saving the picture
  • Step3: turn the image into a Bitmap
  • Step4: save to album (dynamic permission application)
  • Step5 save the album successfully and notify the system to update the album
  • Step6 perform the callback of dynamic permission application in the Fragment
  • supplement

preface

This paper is based on the implementation of fragment to save H5 images to the local album. Compared with the implementation of Acvitity, trimming is a little complicated, but there is no significant difference in the code

Step1: WebView adds the long press event

private WebView.HitTestResult hitTestResult; . webView.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { hitTestResult=webView.getHitTestResult(); / / if the image type or with the type of image links if (hitTestResult. GetType () = = WebView. HitTestResult. IMAGE_TYPE | | hitTestResult. GetType () = = WebView. HitTestResult. SRC_ANCHOR_TYPE) {/ / showBottomDialog pop-up store image dialog box (); return true; } return false; }});Copy the code

Step2: Pop up the bottom dialog box for saving the picture

Private void bottomDialog (){private void bottomDialog (){private void bottomDialog (); View View = view.inflate (context, r.layout. dialog_custom_layout,null); dialog.setContentView(view); Window window = dialog.getWindow(); // Set the pop-up position window.setgravity (Gravity.BOTTOM); / / / / set the popup animation window. SetWindowAnimations (R.s tyle. Main_menu_animStyle); / / Settings dialog window size. SetLayout (ViewGroup. LayoutParams. MATCH_PARENT, ViewGroup. LayoutParams. WRAP_CONTENT); dialog.show(); dialog.findViewById(R.id.tv_take_photo).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { dialog.dismiss(); picUrl = hitTestResult.getExtra(); @override public void run() {urlToBitMap(picUrl); } }).start(); }}); dialog.findViewById(R.id.tv_cancel).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { dialog.dismiss(); }}); }Copy the code

Custom popover layout r.layout. dialog_custom_layout is omitted, write not conducive to install force, do not blame

Step3: turn the image into a Bitmap

Private void urlToBitMap(String picUrl) {Bitmap Bitmap =null; try { URL iconUrl=new URL(picUrl); URLConnection connection=iconUrl.openConnection(); HttpURLConnection httpURLConnection= (HttpURLConnection) connection; int length = httpURLConnection.getContentLength(); connection.connect(); inputStream=connection.getInputStream(); bufferedInputStream=new BufferedInputStream(inputStream,length); bitmap=BitmapFactory.decodeStream(bufferedInputStream); bufferedInputStream.close(); inputStream.close(); if (bitmap ! = null){ saveToAlbum(bitmap); }} catch (Exception e) {logutils. e(" save failed :", e.tostring ()); Activity.runonuithread (new Runnable() {@override public void run() {// toast.makeText (context, "save failed ", Toast.LENGTH_SHORT).show(); }}); e.printStackTrace(); }}Copy the code

Step4: save to album (dynamic permission application)

/** * saveToAlbum * @param bitmap */ private void saveToAlbum(bitmap bitmap) {permissions= new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}; If (build.version.sdk_int >= build.version_codes.m){// Mobile system 6.0 (23) above dynamically apply permission int i=ContextCompat.checkSelfPermission(context,permissions[0]); if (i! = PackageManager. PERMISSION_GRANTED) {/ / unauthorized users, Remind authorization ActivityCompat. RequestPermissions ((Activity) context, new String [] {the Manifest. Permission. WRITE_EXTERNAL_STORAGE}, 111);  }else { appDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "kuaizai"); if (! appDir.exists()) { appDir.mkdirs(); }}} else {/ / system under 23 don't need a dynamic authorization appDir = new File (Environment) external.getexternalstoragedirectory () getAbsolutePath (), "kuaizai"); if (! appDir.exists()) { appDir.mkdirs(); } } // savePicture(); String[] str = picUrl.split("/"); String fileName = str[str.length - 1]; if (appDir ! = null){ File file = new File(appDir, fileName); try { fos = new FileOutputStream(file); / / solution to open the sd card 7.0 system could not find the problem if file (Build) VERSION) SDK_INT > = Build. VERSION_CODES. N) {StrictMode. VmPolicy. Builder Builder = new StrictMode.VmPolicy.Builder(); StrictMode.setVmPolicy(builder.build()); } bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos); fos.flush(); fos.close(); onSaveSuccess(file); } catch (final IOException e) { activity.runOnUiThread(new Runnable() { @Override public void run() { Toast.maketext (context, "save failed "+ e.tostring (), toast.length_short).show(); toast.maketext (context," save failed "+ e.tostring (), toast.length_short). Logutils.e (" save failed :", e.tostring ()); }}); e.printStackTrace(); }}else {toast. makeText(context, "Authorization failed!" , Toast.LENGTH_SHORT).show(); }}Copy the code

Step5 save the album successfully and notify the system to update the album

@param file */ private void onSaveSuccess(final file file) {activity.runonuithRead (new Runnable() { @Override public void run() { ~~try { MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), file.getName(), null); } catch (FileNotFoundException e) { e.printStackTrace(); ContentValues values = new ContentValues();} ContentValues = new ContentValues(); values.put(MediaStore.Images.Media.DATA, file.getAbsolutePath()); values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg"); Uri uri = context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); Context. SendBroadcast (new Intent(intent.action_media_scanner_scan_file, uri. fromFile(file))); Toast.maketext (context, "save successful ", toast.length_short).show(); }}); }Copy the code

Step6 perform the callback of dynamic permission application in the Fragment

@Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { switch (requestCode){ case 111: if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){ if (grantResults[0] == PackageManager.PERMISSION_GRANTED){ new Thread(new Runnable() { @Override public void run() { urlToBitMap(picUrl); } }).start(); }else {toastutils.showtoast2 (context," User rejected! ); return; } } break; Default: toastutils. showToast2(context," save failed! ") ); }}Copy the code

supplement

@Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); List<Fragment> fragments =getSupportFragmentManager().getFragments(); if (fragments == null){ return; } for (Fragment fragment : fragments) { if (fragment ! = null) {/ / call the onRequestPermissionsResult fragments fragment.onRequestPermissionsResult(requestCode,permissions,grantResults); }}}}Copy the code