Where should I write a temporary file?
<p>In android devices external memory may or may not be present.</p>

<p>I am writing an app which in one case stream mp3 from URL &amp; stores it in a file in memory for temporary purpose.</p>

<p>But I want to be sure that, that file will get created.</p>

<p>First I thought of using  <a href="http://developer.android.com/reference/android/content/Context.html#getCacheDir%28%29" rel="nofollow">getCacheDir</a> , but it is mentioned:</p>

<blockquote>
  <p>These files will be ones that get deleted first when the device runs
  low on storage. There is no guarantee when these files will be
  deleted. Note: you should not rely on the system deleting these files
  for you; you should always have a reasonable maximum, such as 1 MB,
  for the amount of space you consume with cache files, and prune those
  files when exceeding that space.</p>
</blockquote>

<p>So, then I thought of using  <a href="http://developer.android.com/reference/android/content/Context.html#getExternalCacheDir%28%29" rel="nofollow">getExternalCacheDir</a> , but then I'm not sure that the device will contain external memory or not.</p>

<p>There is one more optional issue:
Before saving the file in memory, I want to check if the directory has enough space. How can this be done?</p>

<p><strong>Update</strong></p>

<p>I also thought of creating a file in <code>Environment.getDownloadCacheDirectory()</code>, as probably it will be available on every device. </p>

<pre><code>File f3 = new File(Environment.getDownloadCacheDirectory(), "Temp.txt");
    if (!f3.exists()) {
        f3.createNewFile();
    } 
</code></pre>

<p>But got below error trace in createNewFile():</p>

<pre><code>java.io.IOException: Permission denied
    at java.io.File.createNewFileImpl(Native Method)
    at java.io.File.createNewFile(File.java:1257)
    at com.example.activitylifecycle.MyStreamingApp.startStream(MyStreamingApp.java:42)
    at com.example.activitylifecycle.MyStreamingApp.onCreate(MyStreamingApp.java:23)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1836)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1893)
    at android.app.ActivityThread.access$1500(ActivityThread.java:135)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1054)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:150)
    at android.app.ActivityThread.main(ActivityThread.java:4385)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:507)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
    at dalvik.system.NativeStart.main(Native Method)
</code></pre>

<p>Manifest File:</p>

<pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.activitylifecycle"
    android:versionCode="1"
    android:versionName="1.0" &gt;

    &lt;uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" /&gt;

    &lt;uses-permission android:name="android.permission.INTERNET" /&gt;
    &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt;

    &lt;application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" &gt;
        &lt;activity
            android:name="com.example.activitylifecycle.ActivityLifeCycle"
            android:label="@string/app_name" &gt;
            &lt;intent-filter&gt;
                &lt;action android:name="android.intent.action.MAIN" /&gt;

                &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
            &lt;/intent-filter&gt;
        &lt;/activity&gt;
        &lt;activity
            android:name=".MyStreamingApp"
            android:label="@string/app_name" &gt;
            &lt;intent-filter android:priority="100" &gt;
                &lt;action android:name="com.example.activitylifecycle.MYSTREAMINGAPP" /&gt;

                &lt;category android:name="android.intent.category.DEFAULT" /&gt;
            &lt;/intent-filter&gt;
        &lt;/activity&gt;
    &lt;/application&gt;

&lt;/manifest&gt;
</code></pre>

<p>Please suggest.
Thank You</p>
