Upstreaming SelectFileDialog for Android

ui/android/java/src/org/chromium/ui/SelectFileDialog.java

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.ui;
+
+import android.app.Activity;
+import android.content.ContentResolver;
+import android.content.Intent;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.Environment;
+import android.provider.MediaStore;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+import org.chromium.ui.gfx.NativeWindow;
+
+/**
+ * A dialog that is triggered from a file input field that allows a user to select a file based on
+ * a set of accepted file types. The path of the selected file is passed to the native dialog.
+ */
+@JNINamespace("ui")
+class SelectFileDialog implements NativeWindow.IntentCallback{
+    // TODO (aurimas): Swap these constants with AppResources when it gets moved to base to support
+    //                 internationalization.
+    private static final String LOW_MEMORY_ERROR =
+            "Unable to complete previous operation due to low memory";
+    private static final String OPENING_FILE_ERROR = "Failed to open selected file";
+
+    private static final String IMAGE_TYPE = "image/";
+    private static final String VIDEO_TYPE = "video/";
+    private static final String AUDIO_TYPE = "audio/";
+    private static final String ALL_IMAGE_TYPES = IMAGE_TYPE + "*";
+    private static final String ALL_VIDEO_TYPES = VIDEO_TYPE + "*";
+    private static final String ALL_AUDIO_TYPES = AUDIO_TYPE + "*";
+    private static final String ANY_TYPES = "*/*";
+    private static final String CAPTURE_CAMERA = "camera";
+    private static final String CAPTURE_CAMCORDER = "camcorder";
+    private static final String CAPTURE_MICROPHONE = "microphone";
+    private static final String CAPTURE_FILESYSTEM = "filesystem";
+    private static final String CAPTURE_IMAGE_DIRECTORY = "browser-photos";
+
+    private final int mNativeSelectFileDialog;
+    private List<String> mFileTypes;
+    private String mCapture;  // May be null if no capture parameter was set.
+    private Uri mCameraOutputUri;
+
+    private SelectFileDialog(int nativeSelectFileDialog) {
+        mNativeSelectFileDialog = nativeSelectFileDialog;
+    }
+
+    /**
+     * Creates and starts an intent based on the passed fileTypes and capture value.
+     * @param fileTypes MIME types requested (i.e. "image/*")
+     * @param capture The capture value as described in http://www.w3.org/TR/html-media-capture/
+     * @param window The NativeWindow that can show intents
+     */
+    @CalledByNative
+    private void selectFile(String[] fileTypes, String capture, NativeWindow window) {
+        mFileTypes = new ArrayList<String>(Arrays.asList(fileTypes));
+        mCapture = capture;
+
+        Intent chooser = new Intent(Intent.ACTION_CHOOSER);
+        Intent camera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
+        mCameraOutputUri = Uri.fromFile(getFileForImageCapture());
+        camera.putExtra(MediaStore.EXTRA_OUTPUT, mCameraOutputUri);
+        Intent camcorder = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
+        Intent soundRecorder = new Intent(
+                MediaStore.Audio.Media.RECORD_SOUND_ACTION);
+
+        // Quick check - if a capture parameter other than filesystem (the default) is specified we
+        // should just launch the appropriate intent. Otherwise build up a chooser based on the
+        // accept type and then display that to the user.
+        if (captureCamera()) {
+            if (window.showIntent(camera, this, LOW_MEMORY_ERROR)) return;
+        } else if (captureCamcorder()) {
+            if (window.showIntent(camcorder, this, LOW_MEMORY_ERROR)) return;
+        } else if (captureMicrophone()) {
+            if (window.showIntent(soundRecorder, this, LOW_MEMORY_ERROR)) return;
+        }
+
+        Intent getContentIntent = new Intent(Intent.ACTION_GET_CONTENT);
+        getContentIntent.addCategory(Intent.CATEGORY_OPENABLE);
+        ArrayList<Intent> extraIntents = new ArrayList<Intent>();
+        if (!noSpecificType()) {
+            // Create a chooser based on the accept type that was specified in the webpage. Note
+            // that if the web page specified multiple accept types, we will have built a generic
+            // chooser above.
+            if (shouldShowImageTypes()) {
+                extraIntents.add(camera);
+                getContentIntent.setType("image/*");
+            } else if (shouldShowVideoTypes()) {
+                extraIntents.add(camcorder);
+                getContentIntent.setType("video/*");
+            } else if (shouldShowAudioTypes()) {
+                extraIntents.add(soundRecorder);
+                getContentIntent.setType("audio/*");
+            }
+        }
+
+        if (extraIntents.isEmpty()) {
+            // We couldn't resolve an accept type, so fallback to a generic chooser.
+            getContentIntent.setType("*/*");
+            extraIntents.add(camera);
+            extraIntents.add(camcorder);
+            extraIntents.add(soundRecorder);
+        }
+
+        chooser.putExtra(Intent.EXTRA_INITIAL_INTENTS,
+                extraIntents.toArray(new Intent[] { }));
+
+        chooser.putExtra(Intent.EXTRA_INTENT, getContentIntent);
+
+        if (!window.showIntent(chooser, this, LOW_MEMORY_ERROR)) onFileNotSelected();
+    }
+
+    /**
+     * Get a file for the image capture in the CAPTURE_IMAGE_DIRECTORY directory.
+     */
+    private File getFileForImageCapture() {
+        File externalDataDir = Environment.getExternalStoragePublicDirectory(
+                Environment.DIRECTORY_DCIM);
+        File cameraDataDir = new File(externalDataDir.getAbsolutePath() +
+                File.separator + CAPTURE_IMAGE_DIRECTORY);
+        if (!cameraDataDir.exists() && !cameraDataDir.mkdirs()) {
+            cameraDataDir = externalDataDir;
+        }
+        File photoFile = new File(cameraDataDir.getAbsolutePath() +
+                File.separator + System.currentTimeMillis() + ".jpg");
+        return photoFile;
+    }
+
+    /**
+     * Callback method to handle the intent results and pass on the path to the native
+     * SelectFileDialog.
+     * @param window The window that has access to the application activity.
+     * @param resultCode The result code whether the intent returned successfully.
+     * @param contentResolver The content resolver used to extract the path of the selected file.
+     * @param results The results of the requested intent.
+     */
+    @Override
+    public void onIntentCompleted(NativeWindow window, int resultCode,
+            ContentResolver contentResolver, Intent results) {
+        if (resultCode != Activity.RESULT_OK) {
+            onFileNotSelected();
+            return;
+        }
+        boolean success = false;
+        if (results == null) {
+            // If we have a successful return but no data, then assume this is the camera returning
+            // the photo that we requested.
+            nativeOnFileSelected(mNativeSelectFileDialog, mCameraOutputUri.getPath());
+            success = true;
+
+            // Broadcast to the media scanner that there's a new photo on the device so it will
+            // show up right away in the gallery (rather than waiting until the next time the media
+            // scanner runs).
+            window.getActivity().sendBroadcast(new Intent(
+                    Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, mCameraOutputUri));
+        } else {
+            // We get back a content:// URI from the system if the user picked a file from the
+            // gallery. The ContentView has functionality that will convert that content:// URI to
+            // a file path on disk that Chromium understands.
+            Cursor c = contentResolver.query(results.getData(),
+                    new String[] { MediaStore.MediaColumns.DATA }, null, null, null);
+            if (c != null) {
+                if (c.getCount() == 1) {
+                    c.moveToFirst();
+                    String path = c.getString(0);
+                    if (path != null) {
+                        // Not all providers support the MediaStore.DATA column. For example,
+                        // Gallery3D (com.android.gallery3d.provider) does not support it for
+                        // Picasa Web Album images.
+                        nativeOnFileSelected(mNativeSelectFileDialog, path);
+                        success = true;
+                    }
+                }
+                c.close();
+            }
+        }
+        if (!success) {
+            onFileNotSelected();
+            window.showError(OPENING_FILE_ERROR);
+        }
+    }
+
+    private void onFileNotSelected() {
+        nativeOnFileNotSelected(mNativeSelectFileDialog);
+    }
+
+    private boolean noSpecificType() {
+        // We use a single Intent to decide the type of the file chooser we display to the user,
+        // which means we can only give it a single type. If there are multiple accept types
+        // specified, we will fallback to a generic chooser (unless a capture parameter has been
+        // specified, in which case we'll try to satisfy that first.
+        return mFileTypes.size() != 1 || mFileTypes.contains(ANY_TYPES);
+    }
+
+    private boolean shouldShowTypes(String allTypes, String specificType) {
+        if (noSpecificType() || mFileTypes.contains(allTypes)) return true;
+        return acceptSpecificType(specificType);
+    }
+
+    private boolean shouldShowImageTypes() {
+        return shouldShowTypes(ALL_IMAGE_TYPES,IMAGE_TYPE);
+    }
+
+    private boolean shouldShowVideoTypes() {
+        return shouldShowTypes(ALL_VIDEO_TYPES, VIDEO_TYPE);
+    }
+
+    private boolean shouldShowAudioTypes() {
+        return shouldShowTypes(ALL_AUDIO_TYPES, AUDIO_TYPE);
+    }
+
+    private boolean captureCamera() {
+        return shouldShowImageTypes() && mCapture != null && mCapture.startsWith(CAPTURE_CAMERA);
+    }
+
+    private boolean captureCamcorder() {
+        return shouldShowVideoTypes() && mCapture != null &&
+                mCapture.startsWith(CAPTURE_CAMCORDER);
+    }
+
+    private boolean captureMicrophone() {
+        return shouldShowAudioTypes() && mCapture != null &&
+                mCapture.startsWith(CAPTURE_MICROPHONE);
+    }
+
+    private boolean captureFilesystem() {
+        return mCapture != null && mCapture.startsWith(CAPTURE_FILESYSTEM);
+    }
+
+    private boolean acceptSpecificType(String accept) {
+        for (String type : mFileTypes) {
+            if (type.startsWith(accept)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @CalledByNative
+    private static SelectFileDialog create(int nativeSelectFileDialog) {
+        return new SelectFileDialog(nativeSelectFileDialog);
+    }
+
+    private native void nativeOnFileSelected(int nativeSelectFileDialogImpl,
+            String filePath);
+    private native void nativeOnFileNotSelected(int nativeSelectFileDialogImpl);
+}