added runtime permission support

Media/Video/app/build.gradle

@@ -1,6 +1,15 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 19
-    buildToolsVersion "21.1.2"
+    compileSdkVersion 25
+    buildToolsVersion "25.0.2"
+
+    defaultConfig {
+        minSdkVersion 15
+        targetSdkVersion 25
+    }
 }
+
+dependencies {
+    compile 'com.android.support:support-compat:25.2.0'
+}

Media/Video/app/src/main/AndroidManifest.xml

@@ -1,13 +1,25 @@
 <?xml version="1.0"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.commonsware.android.video" android:versionCode="1" android:versionName="1.0">
-
-  <uses-sdk android:minSdkVersion="3" android:targetSdkVersion="6"/>
-  <supports-screens android:largeScreens="true" android:normalScreens="true" android:smallScreens="false"/>
-  <application android:icon="@drawable/ic_launcher">
-    <activity android:label="VideoDemo" android:name=".VideoDemo">
+<manifest package="com.commonsware.android.video"
+  xmlns:android="http://schemas.android.com/apk/res/android"
+  android:versionCode="1"
+  android:versionName="1.0">
+
+  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
+  <supports-screens
+    android:largeScreens="true"
+    android:normalScreens="true"
+    android:smallScreens="false" />
+
+  <application
+    android:icon="@drawable/ic_launcher"
+    android:label="@string/app_name">
+    <activity
+      android:name=".VideoDemo"
+      android:label="VideoDemo">
       <intent-filter>
-        <action android:name="android.intent.action.MAIN"/>
-        <category android:name="android.intent.category.LAUNCHER"/>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
     </activity>
   </application>

Media/Video/app/src/main/java/com/commonsware/android/video/AbstractPermissionActivity.java

@@ -0,0 +1,107 @@
+/***
+ Copyright (c) 2015-2017 CommonsWare, LLC
+ 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.
+
+ Covered in detail in the book _The Busy Coder's Guide to Android Development_
+ https://commonsware.com/Android
+ */
+
+package com.commonsware.android.video;
+
+import android.app.Activity;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
+import java.util.ArrayList;
+
+abstract public class AbstractPermissionActivity
+  extends Activity {
+  abstract protected String[] getDesiredPermissions();
+  abstract protected void onPermissionDenied();
+  abstract protected void onReady(Bundle state);
+
+  private static final int REQUEST_PERMISSION=61125;
+  private static final String STATE_IN_PERMISSION="inPermission";
+  private boolean isInPermission=false;
+  private Bundle state;
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+
+    this.state=savedInstanceState;
+
+    if (state!=null) {
+      isInPermission=state.getBoolean(STATE_IN_PERMISSION, false);
+    }
+
+    if (hasAllPermissions(getDesiredPermissions())) {
+      onReady(state);
+    }
+    else if (!isInPermission) {
+      isInPermission=true;
+
+      ActivityCompat
+        .requestPermissions(this,
+          netPermissions(getDesiredPermissions()),
+          REQUEST_PERMISSION);
+    }
+  }
+
+  @Override
+  public void onRequestPermissionsResult(int requestCode,
+                                         String[] permissions,
+                                         int[] grantResults) {
+    isInPermission=false;
+
+    if (requestCode==REQUEST_PERMISSION) {
+      if (hasAllPermissions(getDesiredPermissions())) {
+        onReady(state);
+      }
+      else {
+        onPermissionDenied();
+      }
+    }
+  }
+
+  @Override
+  protected void onSaveInstanceState(Bundle outState) {
+    super.onSaveInstanceState(outState);
+
+    outState.putBoolean(STATE_IN_PERMISSION, isInPermission);
+  }
+
+  private boolean hasAllPermissions(String[] perms) {
+    for (String perm : perms) {
+      if (!hasPermission(perm)) {
+        return(false);
+      }
+    }
+
+    return(true);
+  }
+
+  private boolean hasPermission(String perm) {
+    return(ContextCompat.checkSelfPermission(this, perm)==
+      PackageManager.PERMISSION_GRANTED);
+  }
+
+  private String[] netPermissions(String[] wanted) {
+    ArrayList<String> result=new ArrayList<String>();
+
+    for (String perm : wanted) {
+      if (!hasPermission(perm)) {
+        result.add(perm);
+      }
+    }
+
+    return(result.toArray(new String[result.size()]));
+  }
+}

Media/Video/app/src/main/java/com/commonsware/android/video/VideoDemo.java

@@ -15,20 +15,34 @@
 package com.commonsware.android.video;
 
 import java.io.File;
+import android.Manifest;
 import android.app.Activity;
 import android.graphics.PixelFormat;
 import android.os.Bundle;
 import android.os.Environment;
 import android.widget.MediaController;
+import android.widget.Toast;
 import android.widget.VideoView;
 
-public class VideoDemo extends Activity {
+public class VideoDemo extends AbstractPermissionActivity {
   private VideoView video;
   private MediaController ctlr;
-
+
+  @Override
+  protected String[] getDesiredPermissions() {
+    return(new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE});
+  }
+
+  @Override
+  protected void onPermissionDenied() {
+    Toast
+      .makeText(this, R.string.msg_sorry, Toast.LENGTH_LONG)
+      .show();
+    finish();
+  }
+
   @Override
-  public void onCreate(Bundle icicle) {
-    super.onCreate(icicle);
+  public void onReady(Bundle icicle) {
     getWindow().setFormat(PixelFormat.TRANSLUCENT);
     setContentView(R.layout.main);
 

Media/Video/app/src/main/res/values/strings.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="app_name">VideoDemo</string>
+  <string name="app_name">VideoDemo</string>
+  <string name="msg_sorry">Sorry, but we need permission to continue!</string>
 </resources>

Media/Video/build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.3'
+        classpath 'com.android.tools.build:gradle:2.3.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

Media/Video/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Apr 10 15:27:10 PDT 2013
+#Wed Mar 15 16:02:01 EDT 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip