diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 000000000..94a25f7f4
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/src/androidTest/java/io/legado/app/ExampleInstrumentedTest.kt b/app/src/androidTest/java/io/legado/app/ExampleInstrumentedTest.kt
new file mode 100644
index 000000000..86b312778
--- /dev/null
+++ b/app/src/androidTest/java/io/legado/app/ExampleInstrumentedTest.kt
@@ -0,0 +1,24 @@
+package io.legado.app
+
+import androidx.test.InstrumentationRegistry
+import androidx.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getTargetContext()
+        assertEquals("cn.legado.book", appContext.packageName)
+    }
+}
diff --git a/app/src/main/java/io/legado/app/App.kt b/app/src/main/java/io/legado/app/App.kt
new file mode 100644
index 000000000..e6fcf2122
--- /dev/null
+++ b/app/src/main/java/io/legado/app/App.kt
@@ -0,0 +1,11 @@
+package io.legado.app
+
+import android.app.Application
+
+class App : Application() {
+
+
+    override fun onCreate() {
+        super.onCreate()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/view/MainActivity.kt b/app/src/main/java/io/legado/app/view/MainActivity.kt
new file mode 100644
index 000000000..8a6f64c65
--- /dev/null
+++ b/app/src/main/java/io/legado/app/view/MainActivity.kt
@@ -0,0 +1,94 @@
+package io.legado.app.view
+
+import android.os.Bundle
+import com.google.android.material.floatingactionbutton.FloatingActionButton
+import com.google.android.material.snackbar.Snackbar
+import androidx.core.view.GravityCompat
+import androidx.appcompat.app.ActionBarDrawerToggle
+import android.view.MenuItem
+import androidx.drawerlayout.widget.DrawerLayout
+import com.google.android.material.navigation.NavigationView
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.Toolbar
+import android.view.Menu
+import io.legado.app.R
+
+class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener {
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+        val toolbar: Toolbar = findViewById(R.id.toolbar)
+        setSupportActionBar(toolbar)
+
+        val fab: FloatingActionButton = findViewById(R.id.fab)
+        fab.setOnClickListener { view ->
+            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
+                .setAction("Action", null).show()
+        }
+        val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
+        val navView: NavigationView = findViewById(R.id.nav_view)
+        val toggle = ActionBarDrawerToggle(
+            this, drawerLayout, toolbar,
+            R.string.navigation_drawer_open,
+            R.string.navigation_drawer_close
+        )
+        drawerLayout.addDrawerListener(toggle)
+        toggle.syncState()
+
+        navView.setNavigationItemSelectedListener(this)
+    }
+
+    override fun onBackPressed() {
+        val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
+        if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
+            drawerLayout.closeDrawer(GravityCompat.START)
+        } else {
+            super.onBackPressed()
+        }
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        menuInflater.inflate(R.menu.main, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        return when (item.itemId) {
+            R.id.action_settings -> true
+            else -> super.onOptionsItemSelected(item)
+        }
+    }
+
+    override fun onNavigationItemSelected(item: MenuItem): Boolean {
+        // Handle navigation view item clicks here.
+        when (item.itemId) {
+            R.id.nav_home -> {
+                // Handle the camera action
+            }
+            R.id.nav_gallery -> {
+
+            }
+            R.id.nav_slideshow -> {
+
+            }
+            R.id.nav_tools -> {
+
+            }
+            R.id.nav_share -> {
+
+            }
+            R.id.nav_send -> {
+
+            }
+        }
+        val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
+        drawerLayout.closeDrawer(GravityCompat.START)
+        return true
+    }
+}
diff --git a/app/src/test/java/io/legado/app/ExampleUnitTest.kt b/app/src/test/java/io/legado/app/ExampleUnitTest.kt
new file mode 100644
index 000000000..57609f92a
--- /dev/null
+++ b/app/src/test/java/io/legado/app/ExampleUnitTest.kt
@@ -0,0 +1,17 @@
+package io.legado.app
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}