App版本更新-便捷安装

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

/**
 * 判断是否是8.0,8.0需要处理未知应用来源权限问题,否则直接安装
 */
private void checkIsAndroidO() {
    if (Build.VERSION.SDK_INT >= 26) {
        boolean b = getPackageManager().canRequestPackageInstalls();
        if (b) {
            // 安装应用的逻辑(写自己的就可以)
            installApk();
        } else {
            //请求安装未知应用来源的权限
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.REQUEST_INSTALL_PACKAGES}, INSTALL_PACKAGES_REQUESTCODE);
        }
    } else {
        installApk();
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
        case INSTALL_PACKAGES_REQUESTCODE:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                installApk();
            } else {
                Intent localIntent = new Intent();
                localIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                if (Build.VERSION.SDK_INT >= 9) {//2.3
                    localIntent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
                    localIntent.setData(Uri.fromParts("package", getPackageName(), null));
                } else if (Build.VERSION.SDK_INT <= 8) {//2.2
                    localIntent.setAction(Intent.ACTION_VIEW);
                    localIntent.setClassName("com.android.settings", "com.android.settings.InstalledAppDetails");
                    localIntent.putExtra("com.android.settings.ApplicationPkgName", getPackageName());
                }
                startActivity(localIntent);
            }
            break;
    }
}

private void installApk() {
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(Uri.fromFile(apkFile),"application/vnd.android.package-archive");
    startActivity(intent);
}