android: add view document from other file-managers functionality.

Change-Id: I2325110a18c0acd93ec235e1a2e0dcc55affa6f5
Reviewed-on: https://gerrit.libreoffice.org/70025
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>

4 files changed, 133 insertions, 22 deletions

diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 044055d01..d13a27cd7 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -101,11 +101,12 @@
                 <data android:mimeType="image/x-wmf" />
                 <data android:mimeType="image/svg+xml" />
             </intent-filter>
-        </activity> <!-- Document Provider Settings Activity -->
-        <activity
-            android:name=".storage.DocumentProviderSettingsActivity"
-            android:label="@string/storage_provider_settings"
-            android:theme="@style/Theme.AppCompat.Light.DarkActionBar">
+        </activity>
+
+        <!-- Document Provider Settings Activity -->
+        <activity android:name=".storage.DocumentProviderSettingsActivity"
+            android:theme="@style/Theme.AppCompat.Light.DarkActionBar"
+            android:label="@string/storage_provider_settings">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
             </intent-filter>
diff --git a/android/app/src/main/java/org/libreoffice/androidapp/MainActivity.java b/android/app/src/main/java/org/libreoffice/androidapp/MainActivity.java
index de45ef978..fd1431939 100644
--- a/android/app/src/main/java/org/libreoffice/androidapp/MainActivity.java
+++ b/android/app/src/main/java/org/libreoffice/androidapp/MainActivity.java
@@ -9,8 +9,10 @@
 
 package org.libreoffice.androidapp;
 
+import android.content.ContentResolver;
 import android.content.SharedPreferences;
 import android.content.pm.ApplicationInfo;
+import android.content.res.AssetFileDescriptor;
 import android.content.res.AssetManager;
 import android.os.Build;
 import android.os.Bundle;
@@ -22,24 +24,39 @@ import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 import android.widget.Button;
+import android.widget.Toast;
 
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.net.URI;
 import java.nio.ByteBuffer;
 import java.nio.channels.Channels;
 import java.nio.channels.FileChannel;
 import java.nio.channels.ReadableByteChannel;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
 
 public class MainActivity extends AppCompatActivity {
     final static String TAG = "MainActivity";
 
     private static final String ASSETS_EXTRACTED_PREFS_KEY = "ASSETS_EXTRACTED";
+    private static final int PERMISSION_WRITE_EXTERNAL_STORAGE = 777;
 
-    WebView mWebView;
+    private File mTempFile = null;
+
+    private int providerId;
+    private URI documentUri;
+
+    private String urlToLoad;
+    private WebView mWebView;
+
+    private boolean isDocEditable = false;
+    private boolean isDocDebuggable = true;
 
     private static boolean copyFromAssets(AssetManager assetManager,
                                           String fromAssetPath, String targetDir) {
@@ -49,7 +66,7 @@ public class MainActivity extends AppCompatActivity {
             boolean res = true;
             for (String file : files) {
                 String[] dirOrFile = assetManager.list(fromAssetPath + "/" + file);
-                if ( dirOrFile.length == 0) {
+                if (dirOrFile.length == 0) {
                     // noinspection ResultOfMethodCallIgnored
                     new File(targetDir).mkdirs();
                     res &= copyAsset(assetManager,
@@ -127,8 +144,29 @@ public class MainActivity extends AppCompatActivity {
         String cacheDir = getApplication().getCacheDir().getAbsolutePath();
         String apkFile = getApplication().getPackageResourcePath();
 
-//        String urlToLoad = "file://" + dataDir + "/hello-world.odt";
-        String urlToLoad=getIntent().getStringExtra("URI");
+        if (getIntent().getData() != null) {
+
+            if (getIntent().getData().getScheme().equals(ContentResolver.SCHEME_CONTENT)) {
+                isDocEditable = false;
+                Toast.makeText(this, getResources().getString(R.string.temp_file_saving_disabled), Toast.LENGTH_SHORT).show();
+                if (copyFileToTemp() && mTempFile != null) {
+                    urlToLoad = mTempFile.toURI().toString();
+                    Log.d(TAG, "SCHEME_CONTENT: getPath(): " + getIntent().getData().getPath());
+                } else {
+                    // TODO: can't open the file
+                    Log.e(TAG, "couldn't create temporary file from " + getIntent().getData());
+                }
+            } else if (getIntent().getData().getScheme().equals(ContentResolver.SCHEME_FILE)) {
+                isDocEditable = true;
+                urlToLoad = getIntent().getData().getPath();
+                Log.d(TAG, "SCHEME_FILE: getPath(): " + getIntent().getData().getPath());
+                // Gather data to rebuild IFile object later
+                providerId = getIntent().getIntExtra(
+                        "org.libreoffice.document_provider_id", 0);
+                documentUri = (URI) getIntent().getSerializableExtra(
+                        "org.libreoffice.document_uri");
+            }
+        }
 
         createLOOLWSD(dataDir, cacheDir, apkFile, assetManager, urlToLoad);
 
@@ -147,11 +185,48 @@ public class MainActivity extends AppCompatActivity {
             }
         }
 
-        mWebView.loadUrl("file:///android_asset/dist/loleaflet.html?file_path=" +
-                urlToLoad +
-                "&closebutton=1&permission=edit" +
-                "&debug=true"); // TODO remove later?
+        loadDocument();
+    }
+
+    private boolean copyFileToTemp() {
+        ContentResolver contentResolver = getContentResolver();
+        FileChannel inputChannel = null;
+        FileChannel outputChannel = null;
+        // CSV files need a .csv suffix to be opened in Calc.
+        String suffix = null;
+        String intentType = getIntent().getType();
+        // K-9 mail uses the first, GMail uses the second variant.
+        if ("text/comma-separated-values".equals(intentType) || "text/csv".equals(intentType))
+            suffix = ".csv";
+
+        try {
+            try {
+                AssetFileDescriptor assetFD = contentResolver.openAssetFileDescriptor(getIntent().getData(), "r");
+                if (assetFD == null) {
+                    Log.e(TAG, "couldn't create assetfiledescriptor from " + getIntent().getDataString());
+                    return false;
+                }
+                inputChannel = assetFD.createInputStream().getChannel();
+                mTempFile = File.createTempFile("LibreOffice", suffix, this.getCacheDir());
+
+                outputChannel = new FileOutputStream(mTempFile).getChannel();
+                long bytesTransferred = 0;
+                // might not  copy all at once, so make sure everything gets copied....
+                while (bytesTransferred < inputChannel.size()) {
+                    bytesTransferred += outputChannel.transferFrom(inputChannel, bytesTransferred, inputChannel.size());
+                }
+                Log.e(TAG, "Success copying " + bytesTransferred + " bytes");
+                return true;
+            } finally {
+                if (inputChannel != null) inputChannel.close();
+                if (outputChannel != null) outputChannel.close();
+            }
+        } catch (FileNotFoundException e) {
+            return false;
+        } catch (IOException e) {
+            return false;
         }
+    }
 
     @Override
     protected void onResume() {
@@ -162,37 +237,61 @@ public class MainActivity extends AppCompatActivity {
         updatePreferences();
     }
 
+    private void loadDocument() {
+        String finalUrlToLoad = "file:///android_asset/dist/loleaflet.html?file_path=" +
+                urlToLoad+"&closebutton=1";
+        if (isDocEditable) {
+            finalUrlToLoad += "&permission=edit";
+        } else {
+            finalUrlToLoad += "&permission=readonly";
+        }
+        if (isDocDebuggable) {
+            finalUrlToLoad += "&debug=true";
+        }
+        mWebView.loadUrl(finalUrlToLoad);
+    }
+
     static {
         System.loadLibrary("androidapp");
     }
 
-    /** Initialize the LOOLWSD to load 'loadFileURL'. */
+    /**
+     * Initialize the LOOLWSD to load 'loadFileURL'.
+     */
     public native void createLOOLWSD(String dataDir, String cacheDir, String apkFile, AssetManager assetManager, String loadFileURL);
 
-    /** Passing messages from JS (instead of the websocket communication). */
+    /**
+     * Passing messages from JS (instead of the websocket communication).
+     */
     @JavascriptInterface
     public native void postMobileMessage(String message);
 
-    /** Passing messages from JS (instead of the websocket communication). */
+    /**
+     * Passing messages from JS (instead of the websocket communication).
+     */
     @JavascriptInterface
     public void postMobileError(String message) {
         // TODO handle this
         Log.d(TAG, "postMobileError: " + message);
     }
 
-    /** Passing messages from JS (instead of the websocket communication). */
+    /**
+     * Passing messages from JS (instead of the websocket communication).
+     */
     @JavascriptInterface
     public void postMobileDebug(String message) {
         // TODO handle this
         Log.d(TAG, "postMobileDebug: " + message);
     }
 
-    /** Passing message the other way around - from Java to the FakeWebSocket in JS. */
+    /**
+     * Passing message the other way around - from Java to the FakeWebSocket in JS.
+     */
     void callFakeWebsocketOnMessage(final String message) {
         // call from the UI thread
         mWebView.post(new Runnable() {
             public void run() {
-                Log.i(TAG,"Forwarding to the WebView: " + message);
+                Log.i(TAG, "Forwarding to the WebView: " + message);
                 mWebView.loadUrl("javascript:window.TheFakeWebSocket.onmessage({'data':" + message + "});");
             }
         });
diff --git a/android/app/src/main/java/org/libreoffice/androidapp/ui/LibreOfficeUIActivity.java b/android/app/src/main/java/org/libreoffice/androidapp/ui/LibreOfficeUIActivity.java
index 8f003b6c0..1e7bb63b2 100644
--- a/android/app/src/main/java/org/libreoffice/androidapp/ui/LibreOfficeUIActivity.java
+++ b/android/app/src/main/java/org/libreoffice/androidapp/ui/LibreOfficeUIActivity.java
@@ -580,9 +580,19 @@ public class LibreOfficeUIActivity extends AppCompatActivity implements /*Settin
             @Override
             protected void onPostExecute(File file) {
                 if (file != null) {
-                    Intent intent = new Intent(getBaseContext(), MainActivity.class);
-                    intent.putExtra("URI", document.getUri().toString());
-                    startActivity(intent);
+                    Intent i = new Intent(Intent.ACTION_VIEW, Uri.fromFile(file));
+                    String packageName = getApplicationContext().getPackageName();
+                    ComponentName componentName = new ComponentName(packageName,
+                            MainActivity.class.getName());
+                    i.setComponent(componentName);
+
+                    // these extras allow to rebuild the IFile object in LOMainActivity
+                    i.putExtra("org.libreoffice.document_provider_id",
+                            documentProvider.getId());
+                    i.putExtra("org.libreoffice.document_uri",
+                            document.getUri());
+
+                    startActivity(i);
                 }
             }
         }.execute(document);
diff --git a/android/app/src/main/res/values/strings.xml b/android/app/src/main/res/values/strings.xml
index 69f49d340..5b0c83ea9 100644
--- a/android/app/src/main/res/values/strings.xml
+++ b/android/app/src/main/res/values/strings.xml
@@ -7,6 +7,7 @@
     <string name="app_vendor">This release was supplied by $VENDOR.</string>
     <string name="no_recent_items">No recent items</string>
     <string name="no_items">No items</string>
+    <string name="temp_file_saving_disabled">This file is read-only, saving is disabled.</string>
 
     <string name="about_license">Show License</string>
     <string name="about_notice">Show Notice</string>