下载并安装APK

Question

I made code that download APK from ftp, and I`m trying to install it after download. I wrote this for Honeycomb, so in every connection i have to use threads. How can I use startActivity in class within thread, or wait for thread to finish?

public class FTPapkDowload {
protected static final String TAG = "Tablet Development";
public FTPClient mFTPClient = null;
public FTPClient mFtp = null;

public void Start() {

Thread apkdowload = new Thread(new Runnable() {
        @Override
        public void run() {

            ftpConnect("mysite", "username", "password",21);
            Log.d(TAG, "Connected");
            ftpDownload("/httpdocs/Shamir/app.apk", "sdcard/Download/app.apk");
            ftpDisconnect();

            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/Download/" + "app.apk")), "application/vnd.android.package-archive");
            startActivity(intent); //Here is the problem


        }

        //Connection
        public boolean ftpConnect(String host, String username,
                String password, int port) {
            try {

                mFTPClient = new FTPClient();
                mFTPClient.connect(host, port); 

                if (FTPReply.isPositiveCompletion(mFTPClient.getReplyCode())) {
                    boolean status = mFTPClient.login(username, password);

                    mFTPClient.setFileType(FTP.BINARY_FILE_TYPE);
                    mFTPClient.enterLocalPassiveMode();
                    return status;
                }
            } catch (Exception e) {
                Log.d(TAG, "Error: could not connect to host " + host);
            }

            return false;
        }


        //Downloading
        public boolean ftpDownload(String srcFilePath, String desFilePath) {
            boolean status = false;
            try {

                FileOutputStream desFileStream = new FileOutputStream(
                        desFilePath);
                status = mFTPClient
                        .retrieveFile(srcFilePath, desFileStream);
                desFileStream.close();
                return status;
            } catch (Exception e) {
                Log.d(TAG, "download failed");
            }

            return status;
        }



        public boolean ftpDisconnect() {

            try {
                mFTPClient.logout();
                mFTPClient.disconnect();
                Log.d(TAG, "Disconected from FTP on apk Download");

                return true;
            } catch (Exception e) {
                Log.d(TAG,"Error occurred while disconnecting from ftp server on apk download.");
            }

            return false;
        }

    });

    apkdowload.start();
}

}

Answer 1

You can use a handler:

private Handler handler = new Handler(){
        public void handleMessage(Message msg)
        {

        }
    };

When your thread is done running the code it needs to call: handler.sendEmptyMessage(0);

More info: http://developer.android.com/reference/android/os/Handler.html

Answer 2

The cleanest way to do this is for your FTP download code to notify your main thread that it has finished, and make the main (UI) thread call startActivity. You can do this using any number of methods for communication between threads, for example a Handler:

http://developer.android.com/reference/android/os/Handler.html

Or simply Activity.runOnUiThread:

http://developer.android.com/reference/android/app/Activity.html#runOnUiThread(java.lang.Runnable )

A good read is the "Painless Threading" blog post:

http://android-developers.blogspot.com/2009/05/painless-threading.html

Answer 3

我想您需要将活动的上下文传递给您要在其中使用活动方法的类。

Answer 4

To execute UI methods you have run this on UI Thread:

Put this inside your normal Threads run() Method:

       YourClass.this.runOnUiThread(new Runnable() {
           @Override
           public void run() {

               startyourActivity();
           }
       });