android下载安装apk

添加权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>

使用FileProvider

1:自定义一个provider，空的即可

public class MyFileProvider extends FileProvider {
}

2:注册此provider

<provider
    android:name=".support.update.MyFileProvider"
    android:authorities="${applicationId}.fileprovider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/crms_file_paths" />
</provider>

3:添加provider的xml

<?xml version="1.0" encoding="utf-8"?>
<paths>
  <external-files-path
      name="external_files"
      path="." />
  <external-path
      name="Download"
      path="Download/"/>
  <files-path
      name="files"
      path="." />
  <external-cache-path
      name="external_cache"
      path="." />
</paths>

安装适配

//判读版本是否在7.0以上
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    //在AndroidManifest中的android:authorities值

    String filepath = context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)+"/"+"crms.apk";
    Uri puri = FileProvider.getUriForFile(context,BuildConfig.APPLICATION_ID+".fileprovider", new File(filepath));

    Intent install = new Intent(Intent.ACTION_VIEW);
    install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    //添加这一句表示对目标应用临时授权该Uri所代表的文件
    install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    install.setDataAndType(puri, "application/vnd.android.package-archive");
    context.startActivity(install);
} else {
    Intent install = new Intent(Intent.ACTION_VIEW);
    install.setDataAndType(downloadFileUri, "application/vnd.android.package-archive");
    install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(install);
}