add basic write example

README.md

@@ -12,23 +12,29 @@ All javax classes from the STAX library and calls to them are renamed to aavax,
 * poi-3.12-android-a.jar //Repacked POI with all dependencies
 * poi-ooxml-schemas-3.12-20150511-a.jar //original schemas jar
 
-Copy these two jars into your project's libs directory and use gradle config similar to build.gradle from this repo.
+Copy these two jars into your project's libs directory and use gradle config similar to [build.gradle](build.gradle) from this repo.
 
-It will work if you use all original files from https://poi.apache.org/download.html, however you need to re-pack xmlbeans-2.6.0.jar because for some reason it contains duplicates and Android does not like it. See below for contents of jar and details of javax -> aavax hack.
+It will also work if you use all original files from https://poi.apache.org/download.html, however you need to re-pack xmlbeans-2.6.0.jar because for some reason it contains duplicates and Android does not like it. See below for contents of jar and details of javax -> aavax hack.
 
 #Configuration
-Please find gradle app configuration with comments in the build.gradle, the crucial thing is enabling multi-dex.
+Please find gradle app configuration with comments in the build.gradle, the crucial thing is to enable multi-dex.
 
 #Auto-downloading dependencies
 This might also be achieved by adding 'org.apache.poi:poi-ooxml:3.12' into dependencies, but it is not very straightforward because it is required to add some routine to re-pack xmlbeans and disable preDex. It will work. however the build process will be very slow, so it is easier just to prepare jars once and put them into libs directory (as described above)
 
+
+#Usage example
+Please find usage example in [example](example)
+
+
 #Contents of poi-3.12 jar
 * poi-3.12-20150511.jar  
 * poi-ooxml-3.12-20150511.jar  
 * stax-1.2.0.jar  
 * stax-api-1.0.1.jar  
 * *xmlbeans-2.6.0.jar* //this one contained duplicates, Android does not like it
 
+
 #javax -> aavax hack
 the following classes and calls to them were renamed (as HEX strings + renaming namespace dir javax to aavax):
 * javax/xml/namespace -> aavax/xml/namespace
@@ -39,8 +45,3 @@ the following classes and calls to them were renamed (as HEX strings + renaming
 * javax.xml.XMLConstants -> aavax.xml.XMLConstants
 
 Please note that you'd better not replace all javax to aavax, because there might be calls other classes from javax package which are available in android.
-
-
-
-#Usage example
-Usage example is coming soon

README.md~

@@ -0,0 +1,47 @@
+#Reading and Writing XLSX on Android 5
+Reading and Writing XLSX and XLS on Android 5 with Apache POI
+
+It was quite a challenging task to use Apache POI on android with Dalvik VM. It is much easier to use Apache POI on Android 5+ with ART VM and Build Tools 21+
+
+Please refer to https://github.com/andruhon/AndroidReadXLSX if you need to read XLSX on Android 4 with Dalvik VM.
+
+#Contents
+I've repacked poi-ooxml to contain all dependencies in order to read and write XLSX (XLS as well, obviously)
+All javax classes from the STAX library and calls to them are renamed to aavax, to avoid --core-library warning and conflicts.
+
+* poi-3.12-android-a.jar //Repacked POI with all dependencies
+* poi-ooxml-schemas-3.12-20150511-a.jar //original schemas jar
+
+Copy these two jars into your project's libs directory and use gradle config similar to [build.gradle](build.gradle) from this repo.
+
+It will also work if you use all original files from https://poi.apache.org/download.html, however you need to re-pack xmlbeans-2.6.0.jar because for some reason it contains duplicates and Android does not like it. See (below)[#Contents of poi-3.12 jar] for contents of jar and details of javax -> aavax hack.
+
+#Configuration
+Please find gradle app configuration with comments in the build.gradle, the crucial thing is to enable multi-dex.
+
+#Auto-downloading dependencies
+This might also be achieved by adding 'org.apache.poi:poi-ooxml:3.12' into dependencies, but it is not very straightforward because it is required to add some routine to re-pack xmlbeans and disable preDex. It will work. however the build process will be very slow, so it is easier just to prepare jars once and put them into libs directory (as described above)
+
+
+#Usage example
+Please find usage example in [example](example)
+
+
+#Contents of poi-3.12 jar
+* poi-3.12-20150511.jar  
+* poi-ooxml-3.12-20150511.jar  
+* stax-1.2.0.jar  
+* stax-api-1.0.1.jar  
+* *xmlbeans-2.6.0.jar* //this one contained duplicates, Android does not like it
+
+
+#javax -> aavax hack
+the following classes and calls to them were renamed (as HEX strings + renaming namespace dir javax to aavax):
+* javax/xml/namespace -> aavax/xml/namespace
+* javax.xml.namespace -> aavax.xml.namespace
+* javax/xml/stream -> aavax/xml/stream
+* javax.xml.stream -> aavax.xml.stream
+* javax/xml/XMLConstants -> aavax/xml/XMLConstant
+* javax.xml.XMLConstants -> aavax.xml.XMLConstants
+
+Please note that you'd better not replace all javax to aavax, because there might be calls other classes from javax package which are available in android.

example/app/build.gradle

@@ -5,11 +5,11 @@ android {
     buildToolsVersion "23.0.2"
 
     defaultConfig {
-        applicationId "com.example.andruhon.xlsxpoiexample"
+        applicationId "pro.kondratev.xlsxpoiexample"
         minSdkVersion 21
         targetSdkVersion 23
-        versionCode 1
-        versionName "1.0"
+        versionCode 9
+        versionName "0.1.0"
         multiDexEnabled true
     }
     packagingOptions {

example/app/src/main/AndroidManifest.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.andruhon.xlsxpoiexample">
+    package="pro.kondratev.xlsxpoiexample">
+
+    <uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
 
     <application
         android:allowBackup="true"
@@ -16,6 +18,12 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <provider
+            android:name=".ShareContentProvider"
+            android:authorities="pro.kondratev.xlsxpoiexample"
+            android:exported="true"
+            />
     </application>
 
 </manifest>

example/app/src/main/java/com/example/andruhon/xlsxpoiexample/MainActivity.java → example/app/src/main/java/pro/kondratev/xlsxpoiexample/MainActivity.java

@@ -1,18 +1,25 @@
-package com.example.andruhon.xlsxpoiexample;
+package pro.kondratev.xlsxpoiexample;
 
 import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.EditText;
 
+import java.io.File;
+import java.io.FileOutputStream;
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.text.SimpleDateFormat;
 
 import org.apache.poi.hssf.usermodel.HSSFDateUtil;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.CellValue;
 import org.apache.poi.ss.usermodel.FormulaEvaluator;
 import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.util.WorkbookUtil;
 import org.apache.poi.xssf.usermodel.XSSFSheet;
 import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 
@@ -28,7 +35,7 @@ protected void onCreate(Bundle savedInstanceState) {
     }
 
     public void onReadClick(View view) {
-        appendOutput("reading file from resources");
+        printlnToUser("reading XLSX file from resources");
         InputStream stream = getResources().openRawResource(R.raw.test1);
         try {
             XSSFWorkbook workbook = new XSSFWorkbook(stream);
@@ -39,22 +46,44 @@ public void onReadClick(View view) {
                 Row row = sheet.getRow(r);
                 int cellsCount = row.getPhysicalNumberOfCells();
                 for (int c = 0; c<cellsCount; c++) {
-                    String value = getCellStringRepr(row, c, formulaEvaluator);
+                    String value = getCellAsString(row, c, formulaEvaluator);
                     String cellInfo = "r:"+r+"; c:"+c+"; v:"+value;
-                    appendOutput(cellInfo);
+                    printlnToUser(cellInfo);
                 }
             }
         } catch (Exception e) {
             /* proper exception handling to be here */
-            appendOutput(e.toString());
+            printlnToUser(e.toString());
         }
     }
 
     public void onWriteClick(View view) {
-        appendOutput("TODO: write example");
+        printlnToUser("writing xlsx file");
+        XSSFWorkbook workbook = new XSSFWorkbook();
+        XSSFSheet sheet = workbook.createSheet(WorkbookUtil.createSafeSheetName("mysheet"));
+        for (int i=0;i<10;i++) {
+            Row row = sheet.createRow(i);
+            Cell cell = row.createCell(0);
+            cell.setCellValue(i);
+        }
+        String outFileName = "filetoshare.xlsx";
+        try {
+            printlnToUser("writing file " + outFileName);
+            File cacheDir = getCacheDir();
+            File outFile = new File(cacheDir, outFileName);
+            OutputStream outputStream = new FileOutputStream(outFile.getAbsolutePath());
+            workbook.write(outputStream);
+            outputStream.flush();
+            outputStream.close();
+            printlnToUser("sharing file...");
+            share(outFileName, getApplicationContext());
+        } catch (Exception e) {
+            /* proper exception handling to be here */
+            printlnToUser(e.toString());
+        }
     }
 
-    protected String getCellStringRepr(Row row, int c, FormulaEvaluator formulaEvaluator) {
+    protected String getCellAsString(Row row, int c, FormulaEvaluator formulaEvaluator) {
         String value = "";
         try {
             Cell cell = row.getCell(c);
@@ -81,16 +110,16 @@ protected String getCellStringRepr(Row row, int c, FormulaEvaluator formulaEvalu
             }
         } catch (NullPointerException e) {
             /* proper error handling should be here */
-            appendOutput(e.toString());
+            printlnToUser(e.toString());
         }
         return value;
     }
 
     /**
-     * print message to the output TextView
+     * print line to the output TextView
      * @param str
      */
-    private void appendOutput(String str) {
+    private void printlnToUser(String str) {
         final String string = str;
         if (output.length()>8000) {
             CharSequence fullOutput = output.getText();
@@ -101,5 +130,14 @@ private void appendOutput(String str) {
         output.append(string+"\n");
     }
 
+    public void share(String fileName, Context context) {
+        Uri fileUri = Uri.parse("content://"+getPackageName()+"/"+fileName);
+        printlnToUser("sending "+fileUri.toString()+" ...");
+        Intent shareIntent = new Intent();
+        shareIntent.setAction(Intent.ACTION_SEND);
+        shareIntent.putExtra(Intent.EXTRA_STREAM, fileUri);
+        shareIntent.setType("application/octet-stream");
+        startActivity(Intent.createChooser(shareIntent, getResources().getText(R.string.send_to)));
+    }
 
 }

example/app/src/main/java/pro/kondratev/xlsxpoiexample/ShareContentProvider.java

@@ -0,0 +1,64 @@
+package pro.kondratev.xlsxpoiexample;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+
+import android.content.ContentProvider;
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.ParcelFileDescriptor;
+
+/**
+ * This is just a share content provider,
+ * IT IS IRRELEVANT TO THE EXAMPLE BY ITSELF
+ */
+public class ShareContentProvider extends ContentProvider {
+
+
+    @Override
+    public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
+        File cacheDir = getContext().getCacheDir(); //may produce NullPointer
+        File privateFile = new File(cacheDir, uri.getLastPathSegment());
+        return ParcelFileDescriptor.open(privateFile, ParcelFileDescriptor.MODE_READ_ONLY);
+    }
+
+    @Override
+    public boolean onCreate() {
+        // no create
+        return false;
+    }
+
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection,
+                        String[] selectionArgs, String sortOrder) {
+        // no query
+        return null;
+    }
+
+    @Override
+    public String getType(Uri uri) {
+        // no get type
+        return null;
+    }
+
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        // no insert
+        return null;
+    }
+
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        // no delete
+        return 0;
+    }
+
+    @Override
+    public int update(Uri uri, ContentValues values, String selection,
+                      String[] selectionArgs) {
+        // no update
+        return 0;
+    }
+
+}

example/app/src/main/res/layout/activity_main.xml

@@ -8,7 +8,7 @@
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
-    tools:context="com.example.andruhon.xlsxpoiexample.MainActivity">
+    tools:context="pro.kondratev.xlsxpoiexample.MainActivity">
 
 
     <Button

example/app/src/main/res/values/strings.xml

@@ -2,4 +2,5 @@
     <string name="app_name">XLSXPOIExample</string>
     <string name="read_xlsx">Read XLSX</string>
     <string name="write_xlsx">Write XLSX</string>
+    <string name="send_to">Send to...</string>
 </resources>