Flutter插件开发之APK自动安装
本文适用于Android开发人员
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什么是Flutter Plugin
Flutter Plugin是一种特殊的包，包含一个用Dart编写的API定义，结合Android和iOS的平台特定实现，从而达到二者兼容。
- 应用的Flutter部分通过平台通道（platform channel）将消息发送到其应用程序的所在的宿主（iOS或Android）
-
宿主监听的平台通道，并接收该消息。然后它会调用特定于该平台的API（使用原生编程语言） - 并将响应发送回客户端，即应用程序的Flutter部分
使用平台通道在客户端（Flutter UI）和宿主（平台）之间传递消息，如下图所示
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创建Flutter App
相关代码见运行第一个Flutter App
创建Flutter Plugin
右键工程->New->Module，如下图所示
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选择Flutter Plugin,点击Next，如下图所示
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输入工程名（Project name），点击Next，如下图所示
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输入包名（Package name），点击Finish，入下图所示
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到此Flutter plugin创建完成。
引入插件
在工程目录下找到pubspec.yaml文件，在dev_dependencies添加如下依赖，如下图所示
enter image description here
相关代码如下
dev_dependencies:
flutter_test:
sdk: flutter
install_apk_plugin:
path: install_apk_plugin
获取版本号demo
打开插件lib下的dart文件，会有平台自动生成的代码，具体是实现获取APP版本号，如下面代码所示
class InstallApkPlugin {
static const MethodChannel _channel =
const MethodChannel('install_apk_plugin');
static Future<String> get platformVersion async {
final String version = await _channel.invokeMethod('getPlatformVersion');
return version;
}
}
java部分的代码如下面所示
public class InstallApkPlugin implements MethodCallHandler {
private static final String TAG = "InstallApkPlugin";
private final Registrar registrar;
/**
* Plugin registration.
*/
public static void registerWith(Registrar registrar) {
final MethodChannel channel = new MethodChannel(registrar.messenger(), "install_apk_plugin");
channel.setMethodCallHandler(new InstallApkPlugin(registrar));
}
private InstallApkPlugin(Registrar registrar) {
this.registrar = registrar;
}
@Override
public void onMethodCall(MethodCall call, Result result) {
if (call.method.equals("getPlatformVersion")) {
result.success("Android " + android.os.Build.VERSION.RELEASE);
} else {
result.notImplemented();
}
}
}
实现自动安装APK
实现自动安装APK，需要从Flutter应用层传入一个APK安装包的地址到host层，dart代码如下所示：
class InstallApkPlugin {
static const MethodChannel _channel =
const MethodChannel('install_apk_plugin');
static Future<String> get platformVersion async {
final String version = await _channel.invokeMethod('getPlatformVersion');
return version;
}
static Future<bool> installApk(String path) async {
final bool isSuccess = await _channel.invokeMethod('installApk', path);
return isSuccess;
}
}
java部分的代码如下所示
public class InstallApkPlugin implements MethodCallHandler {
private static final String TAG = "InstallApkPlugin";
private final Registrar registrar;
/**
* Plugin registration.
*/
public static void registerWith(Registrar registrar) {
final MethodChannel channel = new MethodChannel(registrar.messenger(), "install_apk_plugin");
channel.setMethodCallHandler(new InstallApkPlugin(registrar));
}
private InstallApkPlugin(Registrar registrar) {
this.registrar = registrar;
}
@Override
public void onMethodCall(MethodCall call, Result result) {
if (call.method.equals("getPlatformVersion")) {
result.success("Android " + android.os.Build.VERSION.RELEASE);
} else if (call.method.equals("installApk")) {
final String path = (String) call.arguments;
Log.d(TAG, "installApk path is " + path);
} else {
result.notImplemented();
}
}
}
到此，host层就能获取到APK安装包的路径了，后面只需实现Android安装APK的代码逻辑即可，在日志下面添加如下代码
File file = new File(path);
installApk(file, registrar.context());
installApk代码实现如下所示
private void installApk(File apkFile, Context context) {
Intent installApkIntent = new Intent();
installApkIntent.setAction(Intent.ACTION_VIEW);
installApkIntent.addCategory(Intent.CATEGORY_DEFAULT);
installApkIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri apkUri = null;
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
apkUri = FileProvider.getUriForFile(context, context.getPackageName() + ".fileprovider", apkFile);
installApkIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
} else {
apkUri = Uri.fromFile(apkFile);
}
installApkIntent.setDataAndType(apkUri, "application/vnd.android.package-archive");
if (context.getPackageManager().queryIntentActivities(installApkIntent, 0).size() > 0) {
context.startActivity(installApkIntent);
}
}
除此之外，还需修改AndroidManifest.xml内的代码，如下面代码所示
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.yuzo.install_apk_plugin">
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
<application>
<!--provider start-->
<provider
android:name="androidx.core.content.FileProvider"
tools:replace="android:authorities"
android:authorities="com.yuzo.opengit.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
tools:replace="android:resource"
android:resource="@xml/file_path" />
</provider>
<!--provider end-->
</application>
</manifest>
file_path.xml放在res->xml文件夹下面，如下面代码所示
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:tools="http://schemas.android.com/tools"
tools:ignore="ResourceName">
<root-path
name="root_path"
path="." />
</paths>
运行代码如下图所示
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