Java tutorial
/* This file is part of the Diaspora for Android. Diaspora for Android is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Diaspora for Android is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with the Diaspora for Android. If not, see <http://www.gnu.org/licenses/>. */ package com.github.dfa.diaspora_android.ui; import android.Manifest; import android.app.Activity; import android.app.AlertDialog; import android.app.DownloadManager; import android.content.ClipData; import android.content.ClipboardManager; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.net.Uri; import android.os.Environment; import android.support.v4.content.LocalBroadcastManager; import android.util.AttributeSet; import android.view.ContextMenu; import android.view.MenuItem; import android.widget.Toast; import com.github.dfa.diaspora_android.R; import com.github.dfa.diaspora_android.activity.MainActivity; import com.github.dfa.diaspora_android.task.ImageDownloadTask; import java.io.File; /** * Subclass of WebView which adds a context menu for long clicks on images or links to share, save * or open with another browser */ @SuppressWarnings("deprecation") public class ContextMenuWebView extends NestedWebView { public static final int ID_SAVE_IMAGE = 10; public static final int ID_IMAGE_EXTERNAL_BROWSER = 11; public static final int ID_COPY_LINK = 12; public static final int ID_SHARE_LINK = 13; public static final int ID_SHARE_IMAGE = 14; private final Context context; private Activity parentActivity; private String lasLoadUrl = ""; public ContextMenuWebView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); this.context = context; } public ContextMenuWebView(Context context, AttributeSet attrs) { super(context, attrs); this.context = context; } @Override protected void onCreateContextMenu(ContextMenu menu) { super.onCreateContextMenu(menu); HitTestResult result = getHitTestResult(); MenuItem.OnMenuItemClickListener handler = new MenuItem.OnMenuItemClickListener() { public boolean onMenuItemClick(MenuItem item) { HitTestResult result = getHitTestResult(); String url = result.getExtra(); switch (item.getItemId()) { //Save image to external memory case ID_SAVE_IMAGE: { boolean writeToStoragePermitted = true; if (android.os.Build.VERSION.SDK_INT >= 23) { int hasWRITE_EXTERNAL_STORAGE = parentActivity .checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE); if (hasWRITE_EXTERNAL_STORAGE != PackageManager.PERMISSION_GRANTED) { writeToStoragePermitted = false; if (!parentActivity.shouldShowRequestPermissionRationale( Manifest.permission.WRITE_EXTERNAL_STORAGE)) { new AlertDialog.Builder(parentActivity).setMessage(R.string.permissions_image) .setPositiveButton(context.getText(android.R.string.yes), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if (android.os.Build.VERSION.SDK_INT >= 23) parentActivity.requestPermissions(new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, MainActivity.REQUEST_CODE__ACCESS_EXTERNAL_STORAGE); } }) .setNegativeButton(context.getText(android.R.string.no), null).show(); } parentActivity.requestPermissions( new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, MainActivity.REQUEST_CODE__ACCESS_EXTERNAL_STORAGE); } } if (writeToStoragePermitted) { if (url != null) { Uri source = Uri.parse(url); DownloadManager.Request request = new DownloadManager.Request(source); File destinationFile = new File(Environment.getExternalStorageDirectory() + "/Pictures/Diaspora/" + System.currentTimeMillis() + ".png"); request.setDestinationUri(Uri.fromFile(destinationFile)); ((DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE)).enqueue(request); Toast.makeText(context, context.getText(R.string.share__toast_saved_image_to_location) + " " + destinationFile.getAbsolutePath(), Toast.LENGTH_LONG).show(); } } } break; case ID_SHARE_IMAGE: if (url != null) { boolean writeToStoragePermitted = true; if (android.os.Build.VERSION.SDK_INT >= 23) { int hasWRITE_EXTERNAL_STORAGE = parentActivity .checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE); if (hasWRITE_EXTERNAL_STORAGE != PackageManager.PERMISSION_GRANTED) { writeToStoragePermitted = false; if (!parentActivity.shouldShowRequestPermissionRationale( Manifest.permission.WRITE_EXTERNAL_STORAGE)) { new AlertDialog.Builder(parentActivity).setMessage(R.string.permissions_image) .setPositiveButton(context.getText(android.R.string.yes), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if (android.os.Build.VERSION.SDK_INT >= 23) parentActivity.requestPermissions(new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, MainActivity.REQUEST_CODE__ACCESS_EXTERNAL_STORAGE); } }) .setNegativeButton(context.getText(android.R.string.no), null).show(); } else { parentActivity.requestPermissions( new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, MainActivity.REQUEST_CODE__ACCESS_EXTERNAL_STORAGE); } } } if (writeToStoragePermitted) { final Uri local = Uri.parse(Environment.getExternalStorageDirectory() + "/Pictures/Diaspora/" + System.currentTimeMillis() + ".png"); new ImageDownloadTask(null, local.getPath()) { @Override protected void onPostExecute(Bitmap result) { Uri myUri = Uri.fromFile(new File(local.getPath())); Intent sharingIntent = new Intent(); sharingIntent.setAction(Intent.ACTION_SEND); sharingIntent.putExtra(Intent.EXTRA_STREAM, myUri); sharingIntent.setType("image/png"); sharingIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); context.startActivity(Intent.createChooser(sharingIntent, getResources().getString(R.string.action_share_dotdotdot))); } }.execute(url); } } else { Toast.makeText(context, "Cannot share image: url is null", Toast.LENGTH_SHORT).show(); } break; case ID_IMAGE_EXTERNAL_BROWSER: if (url != null) { Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); context.startActivity(intent); } break; //Copy url to clipboard case ID_COPY_LINK: if (url != null) { ClipboardManager clipboard = (ClipboardManager) context .getSystemService(Context.CLIPBOARD_SERVICE); clipboard.setPrimaryClip(ClipData.newPlainText("text", url)); Toast.makeText(context, R.string.share__toast_link_address_copied, Toast.LENGTH_SHORT) .show(); } break; //Try to share link to other apps case ID_SHARE_LINK: if (url != null) { Intent sendIntent = new Intent(); sendIntent.setAction(Intent.ACTION_SEND); sendIntent.putExtra(Intent.EXTRA_TEXT, url); sendIntent.setType("text/plain"); context.startActivity(Intent.createChooser(sendIntent, getResources().getText(R.string.context_menu_share_link))); } break; } return true; } }; //Build context menu if (result.getType() == HitTestResult.IMAGE_TYPE || result.getType() == HitTestResult.SRC_IMAGE_ANCHOR_TYPE) { // Menu options for an image. menu.setHeaderTitle(result.getExtra()); menu.add(0, ID_SAVE_IMAGE, 0, context.getString(R.string.context_menu_save_image)) .setOnMenuItemClickListener(handler); menu.add(0, ID_IMAGE_EXTERNAL_BROWSER, 0, context.getString(R.string.context_menu_open_external_browser)) .setOnMenuItemClickListener(handler); menu.add(0, ID_SHARE_IMAGE, 0, context.getString(R.string.context_menu_share_image)) .setOnMenuItemClickListener(handler); } else if (result.getType() == HitTestResult.ANCHOR_TYPE || result.getType() == HitTestResult.SRC_ANCHOR_TYPE) { // Menu options for a hyperlink. menu.setHeaderTitle(result.getExtra()); menu.add(0, ID_COPY_LINK, 0, context.getString(R.string.context_menu_copy_link)) .setOnMenuItemClickListener(handler); menu.add(0, ID_SHARE_LINK, 0, context.getString(R.string.context_menu_share_link)) .setOnMenuItemClickListener(handler); } } public void loadUrlNew(String url) { stopLoading(); loadUrl(url); } @Override public void loadUrl(String url) { super.loadUrl(url); // Don't spam intents ;) if (!lasLoadUrl.equals(url)) { Intent updateActivityTitleIntent = new Intent(MainActivity.ACTION_UPDATE_TITLE_FROM_URL); updateActivityTitleIntent.putExtra(MainActivity.EXTRA_URL, getUrl()); LocalBroadcastManager.getInstance(context).sendBroadcast(updateActivityTitleIntent); } lasLoadUrl = url; } public void setParentActivity(Activity activity) { this.parentActivity = activity; } }