use annotations for android sdk constraints

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptListFragment.java

@@ -24,6 +24,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 
+import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.ClipDescription;
 import android.content.Context;
@@ -36,6 +37,7 @@ import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.AsyncTask;
+import android.os.Build.VERSION_CODES;
 import android.os.Bundle;
 import android.os.Parcelable;
 import android.support.v7.widget.DefaultItemAnimator;
@@ -249,6 +251,7 @@ public class DecryptListFragment
         }
     }
 
+    @TargetApi(VERSION_CODES.KITKAT)
     private void saveFileDialog(InputDataResult result, int index) {
 
         Activity activity = getActivity();
@@ -265,8 +268,8 @@ public class DecryptListFragment
             filename = "decrypted" + (ext != null ? "."+ext : "");
         }
 
-        FileHelper.saveDocument(this, filename, metadata.getMimeType(),
+        // requires >=kitkat
-                REQUEST_CODE_OUTPUT);
+        FileHelper.saveDocument(this, filename, metadata.getMimeType(), REQUEST_CODE_OUTPUT);
     }
 
     private void saveFile(Uri saveUri) {

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptFilesFragment.java

@@ -26,6 +26,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
+import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.ClipData;
 import android.content.ClipboardManager;
@@ -35,6 +36,7 @@ import android.graphics.Bitmap;
 import android.graphics.Point;
 import android.net.Uri;
 import android.os.Build;
+import android.os.Build.VERSION_CODES;
 import android.os.Bundle;
 import android.support.v4.app.FragmentActivity;
 import android.support.v7.widget.DefaultItemAnimator;
@@ -217,6 +219,7 @@ public class EncryptFilesFragment
         mSelectedFiles.requestFocus();
     }
 
+    @TargetApi(VERSION_CODES.KITKAT)
     private void showOutputFileDialog() {
         if (mFilesAdapter.getModelCount() != 1) {
             throw new IllegalStateException();
@@ -225,8 +228,7 @@ public class EncryptFilesFragment
         String targetName =
                 (mEncryptFilenames ? "1" : FileHelper.getFilename(getActivity(), model.inputUri))
                         + (mUseArmor ? Constants.FILE_EXTENSION_ASC : Constants.FILE_EXTENSION_PGP_MAIN);
-        FileHelper.saveDocument(this, targetName,
+        FileHelper.saveDocument(this, targetName, REQUEST_CODE_OUTPUT);
-                REQUEST_CODE_OUTPUT);
     }
 
     public void addFile(Intent data) {

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/linked/LinkedIdCreateHttpsStep2Fragment.java

@@ -133,10 +133,7 @@ public class LinkedIdCreateHttpsStep2Fragment extends LinkedIdCreateFinalFragmen
         String targetName = "pgpkey.txt";
 
         // TODO: not supported on Android < 4.4
-        FileHelper.saveDocument(this,
+        FileHelper.saveDocument(this, targetName, "text/plain", REQUEST_CODE_OUTPUT);
-                targetName,
-                "text/plain",
-                REQUEST_CODE_OUTPUT);
     }
 
     private void saveFile(Uri uri) {

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/FileHelper.java

@@ -17,6 +17,16 @@
 
 package org.sufficientlysecure.keychain.util;
 
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
+import java.text.DecimalFormat;
+
 import android.annotation.TargetApi;
 import android.content.ActivityNotFoundException;
 import android.content.ContentResolver;
@@ -31,21 +41,11 @@ import android.os.Build.VERSION_CODES;
 import android.os.Environment;
 import android.provider.DocumentsContract;
 import android.provider.OpenableColumns;
-import android.support.annotation.StringRes;
 import android.support.v4.app.Fragment;
 import android.widget.Toast;
 
 import org.sufficientlysecure.keychain.R;
 
-import java.io.BufferedInputStream;
-import java.io.BufferedOutputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.File;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.UnsupportedEncodingException;
-import java.text.DecimalFormat;
-
 
 /** This class offers a number of helper functions for saving documents.
  *
@@ -73,6 +73,22 @@ import java.text.DecimalFormat;
  */
 public class FileHelper {
 
+    @TargetApi(VERSION_CODES.KITKAT)
+    public static void saveDocument(Fragment fragment, String targetName, int requestCode) {
+        saveDocument(fragment, targetName, "*/*", requestCode);
+    }
+
+    /** Opens the storage browser on Android 4.4 or later for saving a file. */
+    @TargetApi(VERSION_CODES.KITKAT)
+    public static void saveDocument(Fragment fragment, String mimeType, String suggestedName, int requestCode) {
+        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
+        intent.addCategory(Intent.CATEGORY_OPENABLE);
+        intent.setType(mimeType);
+        intent.putExtra("android.content.extra.SHOW_ADVANCED", true); // Note: This is not documented, but works
+        intent.putExtra(Intent.EXTRA_TITLE, suggestedName);
+        fragment.startActivityForResult(intent, requestCode);
+    }
+
     public static void openDocument(Fragment fragment, Uri last, String mimeType, boolean multiple, int requestCode) {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
             openDocumentKitKat(fragment, mimeType, multiple, requestCode);
@@ -81,19 +97,6 @@ public class FileHelper {
         }
     }
 
-    public static void saveDocument(Fragment fragment, String targetName, int requestCode) {
-        saveDocument(fragment, targetName, "*/*", requestCode);
-    }
-
-    public static void saveDocument(Fragment fragment, String targetName, String mimeType,
-                                    int requestCode) {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
-            saveDocumentKitKat(fragment, mimeType, targetName, requestCode);
-        } else {
-            throw new RuntimeException("saveDocument does not support Android < 4.4!");
-        }
-    }
-
     /** Opens the preferred installed file manager on Android and shows a toast
      * if no manager is installed. */
     private static void openDocumentPreKitKat(
@@ -127,17 +130,6 @@ public class FileHelper {
         fragment.startActivityForResult(intent, requestCode);
     }
 
-    /** Opens the storage browser on Android 4.4 or later for saving a file. */
-    @TargetApi(Build.VERSION_CODES.KITKAT)
-    public static void saveDocumentKitKat(Fragment fragment, String mimeType, String suggestedName, int requestCode) {
-        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
-        intent.addCategory(Intent.CATEGORY_OPENABLE);
-        intent.setType(mimeType);
-        intent.putExtra("android.content.extra.SHOW_ADVANCED", true); // Note: This is not documented, but works
-        intent.putExtra(Intent.EXTRA_TITLE, suggestedName);
-        fragment.startActivityForResult(intent, requestCode);
-    }
-
     public static String getFilename(Context context, Uri uri) {
         String filename = null;
         try {