詳細画面に遷移してWebViewで閲覧する

Author: c5apple

app/src/main/AndroidManifest.xml

@@ -3,13 +3,15 @@
     package="com.example.kotlin_qiita_client">
 
     <uses-permission android:name="android.permission.INTERNET" />
+
     <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=".DetailActivity"></activity>
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/com/example/kotlin_qiita_client/DetailActivity.kt

@@ -0,0 +1,25 @@
+package com.example.kotlin_qiita_client
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.webkit.WebView
+import android.webkit.WebViewClient
+
+class DetailActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_detail)
+        val webView = findViewById<WebView>(R.id.web_view)
+        val url = intent.getStringExtra("url")
+
+        // リンクをタップしたときに標準ブラウザを起動させない
+        webView.webViewClient = WebViewClient()
+
+        // 最初に投稿を表示
+        webView.loadUrl(url)
+
+        // jacascriptを許可する
+        webView.settings.javaScriptEnabled = true
+    }
+}

app/src/main/java/com/example/kotlin_qiita_client/MainActivity.kt

@@ -1,6 +1,7 @@
 package com.example.kotlin_qiita_client
 
 import android.content.Context
+import android.content.Intent
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.text.TextUtils
@@ -29,6 +30,7 @@ class MainActivity : AppCompatActivity() {
 
         val listView = findViewById<ListView>(R.id.list_view) as ListView
         listView.adapter = mAdapter
+        listView.onItemClickListener = OnItemClickListener()
 
         val editText = findViewById<EditText>(R.id.edit_text) as EditText
         editText.setOnKeyListener(OnKeyListener())
@@ -102,4 +104,19 @@ class MainActivity : AppCompatActivity() {
             return true
         }
     }
+
+    private inner class OnItemClickListener : AdapterView.OnItemClickListener {
+        override fun onItemClick(
+            adapterView: AdapterView<*>?,
+            view: View?,
+            position: Int,
+            id: Long
+        ) {
+            val intent = Intent(this@MainActivity, DetailActivity::class.java)
+            // タップされた行番号のデータを取り出す
+            val result: Item? = mAdapter.getItem(position)
+            intent.putExtra("url", result?.url)
+            startActivity(intent)
+        }
+    }
 }

app/src/main/res/layout/activity_detail.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".DetailActivity">
+
+    <WebView xmlns:android="http://schemas.android.com/apk/res/android"
+        android:id="@+id/web_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>