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    <p>File IO works fine on Android using JNI. Perhaps you are trying to open a file with a bad path and not checking the return code? I modified the hello-jni example to demonstrate that it is indeed possible to open file and write to it. I hope this helps.</p> <pre><code>/* * Copyright (C) 2009 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ #include &lt;string.h&gt; #include &lt;jni.h&gt; #include &lt;stdio.h&gt; /* This is a trivial JNI example where we use a native method * to return a new VM String. See the corresponding Java source * file located at: * * apps/samples/hello-jni/project/src/com/example/HelloJni/HelloJni.java */ jstring Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env, jobject thiz ) { FILE* file = fopen("/sdcard/hello.txt","w+"); if (file != NULL) { fputs("HELLO WORLD!\n", file); fflush(file); fclose(file); } return (*env)-&gt;NewStringUTF(env, "Hello from JNI (with file io)!"); } </code></pre> <p>Here is the result after running it on my phone (with an SD card):</p> <pre><code>$ adb -d shell cat /sdcard/hello.txt HELLO WORLD! </code></pre>
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    1. POFile Operations in Android NDK
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    1. COThanks, that works! I think my problem was that I wasn't using a full path for my fopen command.
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    2. COWould it be possible to open a file that resides in assets in read only mode?
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    3. COOpening assets using the NDK is more complicated but I describe the required steps [here](http://stackoverflow.com/questions/2651816/reading-resource-files-from-my-own-apk-in-android-native-environment/2663962#2663962).
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