Android 7.0安装apk

由于Android 7.0强制启用了 StrictMode策略，禁止你的App对外暴露file://类型的URI。需要使用FileProvider解决。
新建一个file_paths.xml文件放在res的xml包下

image.png

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <paths>
        <external-path
                path=""
                name="Download"/>
    </paths>
</resources>

在AndroidManifest.xml配置

<!-- 适配7.0获取uri -->
<provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:grantUriPermissions="true"
        android:exported="false">
    <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_paths"/>
</provider>

/**
 * 安装apk
 */
public void installApk(Context context) {
    Intent intent = new Intent(Intent.ACTION_VIEW);
    Uri uri;
    if (SdkVersionUtils.hasNougat()) {
        uri = FileProvider.getUriForFile(this, getApplicationContext().getPackageName() + ".provider",
            new File(DOWNLOAD_SAVE_PATH + File.separator + versionUpdateModel.getApp_name()));
    } else {
        uri = Uri.fromFile(new File(DOWNLOAD_SAVE_PATH + File.separator + versionUpdateModel.getApp_name()));
    }
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    intent.setDataAndType(uri, "application/vnd.android.package-archive");
    context.startActivity(intent);
}

部分手机在下载apk前还需要申请外部存储卡权限

if (SdkVersionUtils.hasMarshmallow()) {//6.0
    mRxPermissions
            .request(Manifest.permission.WRITE_EXTERNAL_STORAGE)
            .subscribe(granted -> {
                if (granted) {
                   //download
                } else if (shouldShowRequestPermissionRationale(Manifest.permission.WRITE_EXTERNAL_STORAGE))
                    ToastUtils.showShortToast(context, "已拒绝写入外部存储卡权限");
                } else {
                    ToastUtils.showShortToast(context, "获取外部存储卡权限失败，需去系统设置中打开");
                }
            });
} else {
   //download
}