--Initial commit.

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        minSdkVersion 19
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:28.0.0-rc01'
+    implementation 'com.android.support:support-v4:28.0.0-rc01'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
+    implementation 'com.android.support:design:28.0.0-rc01'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/hamsoftug/numerickeyboard/ExampleInstrumentedTest.java

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+package com.hamsoftug.numerickeyboard;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.hamsoftug.numerickeyboard", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.hamsoftug.numerickeyboard">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme"/>
+
+</manifest>

app/src/main/java/com/hamsoftug/numerickeyboard/Nk_board.java

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+package com.hamsoftug.numerickeyboard;
+
+
+import android.app.Activity;
+import android.content.Context;
+import android.os.Bundle;
+import android.os.Handler;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+
+/**
+ * A simple {@link Fragment} subclass.
+ */
+public class Nk_board extends Fragment {
+
+    private static final int DELAY = 500;
+
+    private TextView pass1;
+    private TextView pass2;
+    private TextView pass3;
+    private TextView pass4;
+
+    private int length = 0;
+
+    public interface OnKeyBoard {
+        void onPasscodeEntered(String pass);
+        void onOnDeletePressed();
+        void onKeyPressed(int value);
+    }
+
+    private OnKeyBoard listener;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+
+        View rootView = inflater.inflate(R.layout.fragment_nk_board, container, false);
+
+        pass1 = rootView.findViewById(R.id.passcode1);
+        pass2 = rootView.findViewById(R.id.passcode2);
+        pass3 = rootView.findViewById(R.id.passcode3);
+        pass4 = rootView.findViewById(R.id.passcode4);
+
+        rootView.findViewById(R.id.one_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("1");
+            }
+        });
+        rootView.findViewById(R.id.two_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("2");
+            }
+        });
+        rootView.findViewById(R.id.three_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("3");
+            }
+        });
+        rootView.findViewById(R.id.four_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("4");
+            }
+        });
+        rootView.findViewById(R.id.five_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("5");
+            }
+        });
+        rootView.findViewById(R.id.six_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("6");
+            }
+        });
+        rootView.findViewById(R.id.seven_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("7");
+            }
+        });
+        rootView.findViewById(R.id.eight_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("8");
+            }
+        });
+        rootView.findViewById(R.id.nine_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("9");
+            }
+        });
+        rootView.findViewById(R.id.zero_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                add("0");
+            }
+        });
+        rootView.findViewById(R.id.delete_btn).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                switch (length) {
+                    case 1:
+                        pass1.setText(null);
+                        length--;
+                        break;
+                    case 2:
+                        pass2.setText(null);
+                        length--;
+                        break;
+                    case 3:
+                        pass3.setText(null);
+                        length--;
+                        break;
+                    case 4:
+                        pass4.setText(null);
+                        length--;
+                }
+                listener.onOnDeletePressed();
+            }
+        });
+
+        return rootView;
+    }
+
+    @Override
+    public void onAttach(Activity activity) {
+        super.onAttach(activity);
+        try {
+            listener = (OnKeyBoard) activity;
+        } catch (ClassCastException e) {
+            throw new ClassCastException(activity.toString() + " must implement "
+                    + OnKeyBoard.class);
+        }
+    }
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+
+        try {
+            listener = (OnKeyBoard) context;
+        } catch (ClassCastException e) {
+            throw new ClassCastException(context.toString() + " must implement "
+                    + OnKeyBoard.class);
+        }
+
+    }
+
+    private void add(String num) {
+        listener.onKeyPressed(Integer.parseInt(num));
+        switch (length + 1) {
+            case 1:
+                pass1.setText(num);
+                length++;
+                break;
+            case 2:
+                pass2.setText(num);
+                length++;
+                break;
+            case 3:
+                pass3.setText(num);
+                length++;
+                break;
+            case 4:
+                pass4.setText(num);
+                length++;
+
+                new Handler().postDelayed(new Runnable() {
+                    public void run() {
+                        listener.onPasscodeEntered(pass1.getText().toString() + pass2.getText()
+                                + pass3.getText() + pass4.getText());
+                        pass1.setText(null);
+                        pass2.setText(null);
+                        pass3.setText(null);
+                        pass4.setText(null);
+                        length = 0;
+                    }
+                }, DELAY);
+        }
+    }
+
+}