apk安装器
File file = new File(filePath);Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(Intent.ACTION_VIEW);
String type = "application/vnd.android.package-archive";
intent.setDataAndType(Uri.fromFile(file), type);
startActivity(intent);
注：filePath为apk路径
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