title: File.createNewFile() method throws exception in Android M
body: <p>I have a problem to create file in Android M.</p>
  
  <p>I use <strong>Nexus 9</strong> with <strong>Android 6.0.1</strong>. Then I set in my project as below:</p>
  
  <h2>AndroidManifest.xml</h2>
  
  <pre><code>&lt;uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /&gt;
  &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt;
  </code></pre>
  
  <h2>build.gradle</h2>
  
  <pre><code>android {
      defaultConfig {
          targetSdkVersion 23
          ...
      }
  }
  </code></pre>
  
  <h2>MainActivity.Java</h2>
  
  <pre><code>public class MainActivity extends AppCompatActivity {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      String storagePath = Environment.getExternalStorageDirectory().getAbsolutePath();
      String rootPath = storagePath + "/test";
      String fileName = "/test.zip";
  
      File root = new File(rootPath);
      if(!root.mkdirs()) {
          Log.i("Test", "This path is already exist: " + root.getAbsolutePath());
      }
  
      File file = new File(rootPath + fileName);
      try {
          if (!file.createNewFile()) {
              Log.i("Test", "This file is already exist: " + file.getAbsolutePath());
          }
  
      } catch (Exception e) {
          e.printStackTrace();
      }
  }
  </code></pre>
  
  <p>Build was success and application was launched, but I got exception message like this:</p>
  
  <h2>IOExceiption</h2>
  
  <pre><code>01-07 18:13:40.669 18027-18027/com.sample.myapplication W/System.err: java.io.IOException: open failed: ENOENT (No such file or directory)
  01-07 18:13:40.669 18027-18027/com.sample.myapplication W/System.err:     at java.io.File.createNewFile(File.java:939)
  01-07 18:13:40.669 18027-18027/com.sample.myapplication W/System.err:     at com.sample.myapplication.MainActivity.onCreate(MainActivity.java:36)
  01-07 18:13:40.670 18027-18027/com.sample.myapplication W/System.err:     at android.app.Activity.performCreate(Activity.java:6251)
  01-07 18:13:40.670 18027-18027/com.sample.myapplication W/System.err:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
  01-07 18:13:40.670 18027-18027/com.sample.myapplication W/System.err:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
  01-07 18:13:40.670 18027-18027/com.sample.myapplication W/System.err:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
  01-07 18:13:40.670 18027-18027/com.sample.myapplication W/System.err:     at android.app.ActivityThread.-wrap11(ActivityThread.java)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at android.os.Looper.loop(Looper.java:148)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5417)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err: Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at libcore.io.Posix.open(Native Method)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:     at java.io.File.createNewFile(File.java:932)
  01-07 18:13:40.671 18027-18027/com.sample.myapplication W/System.err:   ... 13 more
  </code></pre>
  
  <p>How can I solve this problem? I don't catch what I miss....</p>
  
  <p>Please help.</p>