LayoutInflater extensions

api/current.txt

@@ -664,3 +664,11 @@ package androidx.core.widget {
 
 }
 
+package androidx.view {
+
+  public final class LayoutInflaterKt {
+    ctor public LayoutInflaterKt();
+  }
+
+}
+

src/androidTest/java/androidx/view/LayoutInflaterTest.kt

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package androidx.view
+
+import android.support.test.InstrumentationRegistry
+import android.view.Gravity.LEFT
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup.LayoutParams
+import android.view.ViewGroup.LayoutParams.MATCH_PARENT
+import android.widget.LinearLayout
+import android.widget.LinearLayout.VERTICAL
+import androidx.core.kotlin.test.R
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNotNull
+import org.junit.Assert.fail
+import org.junit.Test
+
+class LayoutInflaterTest {
+    private var context = InstrumentationRegistry.getTargetContext()
+    private var layoutInflater = LayoutInflater.from(context)
+
+    @Test fun inflateLayout() {
+        var view = layoutInflater.inflate<View>(R.layout.test_activity, null, false)
+        assertNotNull(view)
+
+        try {
+            layoutInflater.inflate<View>(-1, null, false)
+            fail("should throw exception")
+        } catch (e: Exception) {
+        }
+
+        val layout = LinearLayout(context)
+        layout.orientation = VERTICAL
+        layout.setHorizontalGravity(LEFT)
+        layout.layoutParams = LayoutParams(MATCH_PARENT, MATCH_PARENT)
+        assertEquals(0, layout.childCount)
+
+        view = layoutInflater.inflate<View>(R.layout.test_activity, layout, false)
+        assertNotNull(view)
+        assertEquals(0, layout.childCount)
+
+        view = layoutInflater.inflate<View>(R.layout.test_activity, layout, true)
+        assertNotNull(view)
+        assertEquals(1, layout.childCount)
+    }
+}

src/main/java/androidx/view/LayoutInflater.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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.
+ */
+
+@file:Suppress("NOTHING_TO_INLINE", "EXTENSION_SHADOWED_BY_MEMBER")
+
+package androidx.view
+
+import android.support.annotation.LayoutRes
+import android.view.InflateException
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import org.xmlpull.v1.XmlPullParser
+
+/**
+ * Inflate a new [View] hierarchy from the specified XML resource.
+ *
+ * @throws [InflateException] if there is an error.
+ */
+inline fun <reified T : View> LayoutInflater.inflate(
+    @LayoutRes resource: Int,
+    root: ViewGroup?,
+    attachToRoot: Boolean = false
+): T = inflate(resource, root, attachToRoot) as T
+
+/**
+ * Inflate a new [View] hierarchy from the specified XML node.
+ *
+ * @throws [InflateException] if there is an error.
+ */
+inline fun <reified T : View> LayoutInflater.inflate(
+    parser: XmlPullParser,
+    root: ViewGroup?,
+    attachToRoot: Boolean = false
+): T = inflate(parser, root, attachToRoot) as T