Implement download and install apk

Example/testHotUpdate/src/index.js

@@ -21,6 +21,7 @@ import {
   switchVersion,
   switchVersionLater,
   markSuccess,
+  downloadAndInstallApk,
 } from 'react-native-update';
 
 import _updateConfig from '../update.json';
@@ -94,11 +95,29 @@ export default class App extends Component {
       return;
     }
     if (info.expired) {
-      Alert.alert('提示', '您的应用版本已更新,请前往应用商店下载新的版本', [
+      Alert.alert('提示', '您的应用版本已更新，点击确定下载安装新版本', [
         {
           text: '确定',
           onPress: () => {
-            info.downloadUrl && Linking.openURL(info.downloadUrl);
+            if (info.downloadUrl) {
+              // apk可直接下载安装
+              if (
+                Platform.OS === 'android' &&
+                info.downloadUrl.endsWith('.apk')
+              ) {
+                downloadAndInstallApk({
+                  url: info.downloadUrl,
+                  onDownloadProgress: ({received, total}) => {
+                    this.setState({
+                      received,
+                      total,
+                    });
+                  },
+                });
+              } else {
+                Linking.openURL(info.downloadUrl);
+              }
+            }
           },
         },
       ]);