Android How to - Install APK from Asset

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Question

We would like to know how to install APK from Asset.

Answer

//from www.j  ava  2 s  . c  o  m
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.content.Intent;
import android.content.res.AssetManager;
import android.net.Uri;
import android.widget.Toast;

class ApkInstaller {
  public static boolean installFromAssets(Context context, String assetsApk) {
    try {
      AssetManager assets = context.getAssets();
      InputStream stream;
      stream = assets.open(assetsApk);
      if (stream == null) {
        Toast.makeText(context, "assets no apk", Toast.LENGTH_SHORT).show();
        return false;
      }

      String folder = "/mnt/sdcard/Android/data";
      File f = new File(folder);
      if (!f.exists()) {
        f.mkdir();
      }

      String apkPath = "/mnt/sdcard/Android/data/SpeechService.apk";
      File file = new File(apkPath);
      if (!writeStreamToFile(stream, file)) {
        return false;
      }
      installApk(context, apkPath);
    } catch (IOException e) {
      e.printStackTrace();
      return false;
    }
    return true;
  }

  public static void openDownloadWeb(Context context, String url) {
    Uri uri = Uri.parse(url);
    Intent it = new Intent(Intent.ACTION_VIEW, uri);
    context.startActivity(it);
  }

  private static boolean writeStreamToFile(InputStream stream, File file) {
    OutputStream output = null;
    try {
      output = new FileOutputStream(file);
      final byte[] buffer = new byte[1024];
      int read;
      while ((read = stream.read(buffer)) != -1) {
        output.write(buffer, 0, read);
      }
      output.flush();
    } catch (Exception e1) {
      e1.printStackTrace();
      return false;
    } finally {
      try {
        output.close();
        stream.close();
      } catch (IOException e) {
        e.printStackTrace();
        return false;
      }
    }
    return true;
  }

  private static void installApk(Context context, String apkPath) {
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.setDataAndType(Uri.fromFile(new File(apkPath)),
        "application/vnd.android.package-archive");
    context.startActivity(intent);
  }
}

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