added runtime permission support

Introspection/ProcessTextBlocker/app/build.gradle

@@ -2,15 +2,16 @@ apply plugin: 'com.android.application'
 
 dependencies {
     compile 'io.karim:materialtabs:2.0.2'
-    compile 'com.android.support:support-v13:22.2.1'
+    compile 'com.android.support:support-v13:25.1.0'
 }
 
 android {
-  compileSdkVersion 22
-  buildToolsVersion "22.0.1"
+  compileSdkVersion 25
+  buildToolsVersion "25.0.2"
 
 	defaultConfig {
       minSdkVersion 15
-      targetSdkVersion 18
+      targetSdkVersion 25
+      applicationId "com.commonsware.android.fileseditor.ptb"
 	}
 }

Introspection/ProcessTextBlocker/app/src/main/AndroidManifest.xml

@@ -1,29 +1,28 @@
 <?xml version="1.0"?>
 <manifest package="com.commonsware.android.fileseditor"
-          xmlns:android="http://schemas.android.com/apk/res/android"
-          android:versionCode="1"
-          android:versionName="1.0">
+  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" />
+  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
   <supports-screens
     android:anyDensity="true"
     android:largeScreens="true"
     android:normalScreens="true"
-    android:smallScreens="true"/>
+    android:smallScreens="true" />
 
   <application
     android:icon="@drawable/ic_launcher"
-    android:theme="@style/Theme.Apptheme"
-    android:label="@string/app_name">
+    android:label="@string/app_name"
+    android:theme="@style/Theme.Apptheme">
     <activity
       android:name=".MainActivity"
       android:label="@string/app_name">
       <intent-filter>
-        <action android:name="android.intent.action.MAIN"/>
+        <action android:name="android.intent.action.MAIN" />
 
-        <category android:name="android.intent.category.LAUNCHER"/>
+        <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
     </activity>
   </application>

Introspection/ProcessTextBlocker/app/src/main/java/com/commonsware/android/fileseditor/AbstractPermissionActivity.java

@@ -0,0 +1,107 @@
+/***
+ Copyright (c) 2015-2016 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.
+
+ From _The Busy Coder's Guide to Android Development_
+ https://commonsware.com/Android
+ */
+
+package com.commonsware.android.fileseditor;
+
+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);
+  }
+
+  protected 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()]));
+  }
+}

Introspection/ProcessTextBlocker/app/src/main/java/com/commonsware/android/fileseditor/MainActivity.java

@@ -1,5 +1,5 @@
 /***
-  Copyright (c) 2012-2015 CommonsWare, LLC
+  Copyright (c) 2012-2017 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
@@ -14,15 +14,28 @@
 
 package com.commonsware.android.fileseditor;
 
-import android.app.Activity;
 import android.os.Bundle;
 import android.support.v4.view.ViewPager;
+import android.widget.Toast;
 import io.karim.MaterialTabs;
+import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
 
-public class MainActivity extends Activity  {
+public class MainActivity extends AbstractPermissionActivity  {
   @Override
-  public void onCreate(Bundle savedInstanceState) {
-    super.onCreate(savedInstanceState);
+  protected String[] getDesiredPermissions() {
+    return(new String[]{WRITE_EXTERNAL_STORAGE});
+  }
+
+  @Override
+  protected void onPermissionDenied() {
+    Toast
+      .makeText(this, R.string.msg_sorry, Toast.LENGTH_LONG)
+      .show();
+    finish();
+  }
+
+  @Override
+  protected void onReady(Bundle savedInstanceState) {
     setContentView(R.layout.main);
 
     ViewPager pager=(ViewPager)findViewById(R.id.pager);

Introspection/ProcessTextBlocker/app/src/main/java/com/commonsware/android/fileseditor/SampleAdapter.java

@@ -17,6 +17,7 @@
 import android.app.Fragment;
 import android.app.FragmentManager;
 import android.content.Context;
+import android.os.Build;
 import android.os.Environment;
 import android.support.v13.app.FragmentPagerAdapter;
 import java.io.File;

Introspection/ProcessTextBlocker/app/src/main/res/layout/editor.xml

@@ -1,8 +1,7 @@
-<EditText
-  android:id="@+id/editor"
-  xmlns:android="http://schemas.android.com/apk/res/android"
-  android:layout_width="match_parent"
-  android:layout_height="match_parent"
-  android:gravity="left|top"
-  android:inputType="textMultiLine"
-  />
+<EditText xmlns:android="http://schemas.android.com/apk/res/android"
+	android:id="@+id/editor"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:inputType="textMultiLine"
+	android:gravity="left|top"
+	/>

Introspection/ProcessTextBlocker/app/src/main/res/values/strings.xml

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-  <string name="app_name">Process Text Blocker Demo</string>
-  <string name="internal">Internal</string>
-  <string name="external">External</string>
-  <string name="pub">Public</string>
+	<string name="app_name">Process Text Blocker Demo</string>
+	<string name="internal">Internal</string>
+	<string name="external">External</string>
+	<string name="pub">Public</string>
+	<string name="msg_sorry">Sorry, but we need permission to continue!</string>
 
 </resources>