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ContentUtils + IOUtils
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‎app/src/main/java/org/andresoviedo/app/util/android/ContentUtils.java

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package org.andresoviedo.app.util.android;
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import android.annotation.TargetApi;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.content.DialogInterface;
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import android.content.Intent;
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import android.content.pm.PackageManager;
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import android.net.Uri;
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import android.os.Build;
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import android.util.Log;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URI;
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import java.util.HashMap;
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import java.util.Map;
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public class ContentUtils {
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/**
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* Documents opened by the user. This list helps finding the relative filenames found in the model
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*/
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private static Map<String,Uri> documentsProvided = new HashMap<>();
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private static ThreadLocal<Activity> currentActivity = new ThreadLocal<>();
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private static File currentDir = null;
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public static void printTouchCapabilities(PackageManager packageManager) {
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if (packageManager.hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN_MULTITOUCH)) {
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Log.i("utils", "System supports multitouch (2 fingers)");
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}
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if (packageManager.hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN_MULTITOUCH_DISTINCT)) {
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Log.i("utils", "System supports advanced multitouch (multiple fingers)");
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}
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}
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public static void setThreadActivity(Activity currentActivity) {
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Log.i("ContentUtils","Current activity thread: "+Thread.currentThread().getName());
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ContentUtils.currentActivity.set(currentActivity);
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}
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private static Activity getCurrentActivity(){
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return ContentUtils.currentActivity.get();
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}
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public static void setCurrentDir(File file){
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ContentUtils.currentDir = file;
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}
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public static void clearDocumentsProvided(){
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// clear documents provided by user (kitkat only)
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documentsProvided.clear();
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}
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public static void provideAssets(Activity activity) {
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documentsProvided.clear();
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try {
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for (String document : activity.getAssets().list("models")) {
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documentsProvided.put(document, Uri.parse("assets://assets/models/" + document));
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}
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}catch(IOException ex){
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Log.e("ContentUtils","Error listing assets from models folder", ex);
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}
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}
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public static void addUri(String name, Uri uri){
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documentsProvided.put(name, uri);
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Log.i("ContentUtils","Added ("+name+") "+uri);
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}
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public static Uri getUri(String name){
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return documentsProvided.get(name);
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}
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/**
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* Find the relative file that should be already selected by the user
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* @param path relative file
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* @return InputStream of the file
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* @throws IOException if there is an error opening stream
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*/
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public static InputStream getInputStream(String path) throws IOException {
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Uri uri = getUri(path);
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if (uri == null && currentDir != null){
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uri = Uri.parse("file://"+new File(currentDir, path).getAbsolutePath());
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}
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if (uri != null){
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return getInputStream(uri);
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}
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return null;
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}
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public static InputStream getInputStream(URI uri) throws IOException {
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return getInputStream(Uri.parse(uri.toString()));
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}
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public static InputStream getInputStream(Uri uri) throws IOException {
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Log.i("ContentUtils","Opening stream "+uri.getPath());
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if (uri.getScheme().equals("assets")){
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Log.i("ContentUtils","Opening asset: "+uri.getPath());
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return getCurrentActivity().getAssets().open(uri.getPath().substring(1));
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}
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return getCurrentActivity().getContentResolver().openInputStream(uri);
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}
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public static Intent createGetContentIntent(String mimeType) {
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// check here to KITKAT or new version
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final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
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if (isKitKat){
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return createGetMultipleContentIntent(mimeType);
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}
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return createGetSingleContentIntent(mimeType);
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}
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/**
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* Get the Intent for selecting content to be used in an Intent Chooser.
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*
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* @return The intent for opening a file with Intent.createChooser()
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*
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* @author paulburke
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*/
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@TargetApi(Build.VERSION_CODES.KITKAT)
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private static Intent createGetMultipleContentIntent(String mimeType) {
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// Implicitly allow the user to select a particular kind of data
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final Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
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// The MIME data type filter
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intent.setType(mimeType);
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// EXTRA_ALLOW_MULTIPLE: added in API level 18
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intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
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// Only return URIs that can be opened with ContentResolver
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intent.addCategory(Intent.CATEGORY_OPENABLE);
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return intent;
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}
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/**
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* Get the Intent for selecting content to be used in an Intent Chooser.
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*
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* @return The intent for opening a file with Intent.createChooser()
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*
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* @author paulburke
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*/
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@TargetApi(Build.VERSION_CODES.KITKAT)
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private static Intent createGetSingleContentIntent(String mimeType) {
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// Implicitly allow the user to select a particular kind of data
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final Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
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// The MIME data type filter
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intent.setType(mimeType);
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// Only return URIs that can be opened with ContentResolver
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intent.addCategory(Intent.CATEGORY_OPENABLE);
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return intent;
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}
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public static void showDialog(Activity activity, String title, CharSequence message, String positiveButtonLabel,
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String negativeButtonLabel, DialogInterface.OnClickListener listener) {
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AlertDialog.Builder builder = new AlertDialog.Builder(activity);
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builder.setTitle(title);
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builder.setMessage(message);
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builder.setPositiveButton(positiveButtonLabel, listener);
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builder.setNegativeButton(negativeButtonLabel, listener);
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builder.create().show();
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}
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public static void showListDialog(Activity activity, String title, String[] options, DialogInterface
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.OnClickListener listener){
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AlertDialog.Builder builder = new AlertDialog.Builder(activity);
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builder.setTitle(title).setItems(options, listener);
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builder.create().show();
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}
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}

‎app/src/main/java/org/andresoviedo/app/util/io/IOUtils.java

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package org.andresoviedo.app.util.io;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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public final class IOUtils {
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public static byte[] read(File file) throws IOException {
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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FileInputStream fis = new FileInputStream(file);
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byte[] data = read(fis);
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fis.close();
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return data;
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}
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public static byte[] read(InputStream is) throws IOException {
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byte[] isData = new byte[512];
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ByteArrayOutputStream buffer = new ByteArrayOutputStream();
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int nRead;
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while ((nRead = is.read(isData, 0, isData.length)) != -1) {
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buffer.write(isData, 0, nRead);
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}
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return buffer.toByteArray();
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}
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}

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