得到

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+<!---
+This is the API of version 1.2.0
+-->
+# TopAppBar
+
+A TopAppBar displays information and actions relating to the current screen and is placed at the top of the screen.
+
+<p align="center">
+  <img src ="{{ site.images }}/material/topappbar/topappbar.png"  height=100 width=300/>
+</p>
+
+```kotlin
+@Composable
+fun TopAppBarSample(){
+    Column {
+        TopAppBar(
+            elevation = 4.dp,
+            title = {
+                Text("I'm a TopAppBar")
+            },
+            backgroundColor =  MaterialTheme.colors.primarySurface,
+            navigationIcon = {
+                IconButton(onClick = {/* Do Something*/ }) {
+                    Icon(Icons.Filled.ArrowBack, null)
+                }
+            }, actions = {
+                IconButton(onClick = {/* Do Something*/ }) {
+                    Icon(Icons.Filled.Share, null)
+                }
+                IconButton(onClick = {/* Do Something*/ }) {
+                    Icon(Icons.Filled.Settings, null)
+                }
+            })
+
+        Text("Hello World")
+
+    }
+}
+```
+
+## See also:
+* [Full Example Code]({{ site.samplefolder }}/material/appbar/topappbar/TopAppBarSample.kt)