仅在下载后安装 update.apk

Question

我怎样才能让下面的代码只有在 update.apk 下载文件时才激活。如果未下载，请不要尝试安装它。在当前模式下，如果存在 update.apk，则会发生即时错误。非常感谢您的建议和宝贵时间。

public class Categori extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_categori);

        // Buscar AdView como recurso y cargar una solicitud.
        AdView adView = (AdView)this.findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().build();
        adView.loadAd(adRequest);

        WebView wv = (WebView) findViewById(R.id.webView);
        WebSettings webSettings = wv.getSettings();
        webSettings.setBuiltInZoomControls(true);
        wv.loadUrl("http://android.vrt.ro/tv-update/ap5.html");

        Intent promptInstall = new Intent(Intent.ACTION_VIEW)
                .setDataAndType(Uri.parse("file:///sdcard/updates/update.apk"),
                        "application/vnd.android.package-archive");
        startActivity(promptInstall);



        inapoibuton();
        filmebuton();
        nationalebuton();
        stiributon();
        muzica();
        documentarebunton();
        sportbuton();
        altlebuton();
        pentrupiticibuton();

        xxxbuton();

    }

Answer 1

你可以这样检查apk文件是否存在：

    String sdcard = Environment.getExternalStorageDirectory().getAbsolutePath();
    String path = sdcard.concat("/updates/update.apk");
    if (new File(path).exists()) {
        Intent promptInstall = new Intent(Intent.ACTION_VIEW)
                .setDataAndType(
                        Uri.parse("file:///sdcard/updates/update.apk"),
                        "application/vnd.android.package-archive"
                );
        startActivity(promptInstall);
    }

仅在下载后安装 update.apk

install update.apk only if you downloaded

android

updates