Review exercise

.gitignore

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+*.iml
+.gradle
+/local.properties
+.idea
+.DS_Store
+/build
+/captures
+.externalNativeBuild

app/.gitignore

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+*.iml
+.gradle
+/local.properties
+.idea
+.DS_Store
+/build
+/captures
+.externalNativeBuild

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 27
+    defaultConfig {
+        applicationId "ru.nikijava.exercise1"
+        minSdkVersion 19
+        targetSdkVersion 27
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    buildToolsVersion '27.0.3'
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    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'
+    implementation 'com.android.support:recyclerview-v7:27.1.1'
+    implementation 'com.android.support:design:27.1.1'
+}

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/ru/nikijava/exercise1/ExampleInstrumentedTest.java

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+package ru.nikijava.exercise1;
+
+import static org.junit.Assert.assertEquals;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * 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("ru.nikijava.exercise1", 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="ru.nikijava.exercise1">
+
+    <uses-permission android:name="android.permission.READ_CONTACTS"/>
+
+    <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">
+        <activity
+            android:name=".MainActivity"
+            android:windowSoftInputMode="adjustResize">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <activity android:name=".SendEmailActivity">
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/ru/nikijava/exercise1/MainActivity.java

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+package ru.nikijava.exercise1;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.view.View;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.Toast;
+
+public class MainActivity extends AppCompatActivity {
+
+    private EditText etMessage;
+    private Button btnPreview;
+    private Button btnClear;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        initView();
+        btnPreview.setOnClickListener(this::showPreview);
+        btnClear.setOnClickListener(v -> etMessage.setText(""));
+    }
+
+    private void initView() {
+        etMessage = findViewById(R.id.etMessage);
+        btnPreview = findViewById(R.id.btnPreview);
+        btnClear = findViewById(R.id.btnClear);
+    }
+
+    private String getMessage() {
+        return etMessage.getText().toString();
+    }
+
+    private void showKeyboard() {
+        etMessage.requestFocus();
+        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
+        if (imm != null) imm.showSoftInput(etMessage, InputMethodManager.SHOW_IMPLICIT);
+    }
+
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        etMessage.postDelayed(this::showKeyboard, 300);
+    }
+
+    private void showPreview(View v) {
+        if (!etMessage.getText().toString().trim().equals("")) {
+            SendEmailActivity.start(getMessage(), this);
+        } else {
+            Toast.makeText(this, R.string.message_empty_enter, Toast.LENGTH_LONG).show();
+        }
+    }
+}

app/src/main/java/ru/nikijava/exercise1/SendEmailActivity.java

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+package ru.nikijava.exercise1;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+public class SendEmailActivity extends AppCompatActivity {
+
+    private static final String KEY_MESSAGE = "key_message";
+    private static final String emailTo = "[email protected]";
+
+    private Button btnEmail;
+    private TextView tvMessage;
+
+    private String message;
+
+    public static void start(String message, Context context) {
+        Intent intent = new Intent(context, SendEmailActivity.class);
+        intent.putExtra(KEY_MESSAGE, message);
+        context.startActivity(intent);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_send_email);
+        initView();
+
+        message = getIntent().getStringExtra(KEY_MESSAGE);
+        tvMessage.setText(message);
+
+        btnEmail.setOnClickListener(v -> startEmailClient());
+    }
+
+    private void initView() {
+        btnEmail = findViewById(R.id.btnEmail);
+        tvMessage = findViewById(R.id.tvMessage);
+    }
+
+    private void startEmailClient() {
+        Intent intent = new Intent(Intent.ACTION_SENDTO);
+        intent.setData(Uri.parse("mailto:" + emailTo));
+        intent.putExtra(Intent.EXTRA_TEXT, message);
+        intent.putExtra(Intent.EXTRA_SUBJECT, "Hello, guys!");
+        if (intent.resolveActivity(getPackageManager()) != null) {
+            startActivity(intent);
+        } else {
+            Toast.makeText(this, R.string.message_no_email_client, Toast.LENGTH_LONG).show();
+        }
+    }
+
+}

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

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+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportHeight="108"
+    android:viewportWidth="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0"/>
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0"/>
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1"/>
+</vector>