从图库中选择视频，然后在已安装的YouTube应用上传

Question

我想构建一个应用程序，允许用户从图库中选择视频，当用户选择视频时，它会开始在手机上安装的youtube应用上传。安装在手机上的youtube应用已经登录。到目前为止，我只能在选择视频时打开应用，请进一步帮助我。

package com.PG.video;

   import android.support.v7.app.ActionBarActivity;
   import android.support.v7.app.ActionBar;
   import android.support.v4.app.Fragment;
   import android.os.Bundle;
   import android.view.LayoutInflater;
   import android.view.Menu;
   import android.view.MenuItem;
   import android.view.View;
   import android.view.
   import android.os.Build;



   import java.io.File;




import android.support.v7.app.ActionBarActivity;
 import android.support.v7.app.ActionBar;
   import android.support.v4.app.Fragment;
   import android.app.Activity;
   import android.content.Intent;
   import android.net.Uri;
   import android.os.Bundle;
   import android.os.Environment;
   import android.view.LayoutInflater;
   import android.view.Menu;
   import android.view.MenuItem;
   import android.view.View;
   import android.view.ViewGroup;
   import android.widget.Button;
   import android.widget.EditText;
   import android.widget.Toast;
   import android.os.Build;
   import android.provider.MediaStore;

   public class MainActivity extends Activity {

Button camerabtn;
Button upld;
public static final int request_Code = 0;
EditText et;
private static final int VIDEO_CAPTURE = 101;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    camerabtn=(Button)findViewById(R.id.button1);
    upld=(Button)findViewById(R.id.button2);

    et=(EditText)findViewById(R.id.editText1);
    camerabtn.setOnClickListener(new View.OnClickListener() 
    {

        @Override
        public void onClick(View v) 
        {
            File mediaFile =new File(Environment.getExternalStorageDirectory().getAbsolutePath() 
                       + "/"+et.getText().toString()+".mp4");

                Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);

                Uri videoUri = Uri.fromFile(mediaFile);

                intent.putExtra(MediaStore.EXTRA_OUTPUT, videoUri);
                startActivityForResult(intent, VIDEO_CAPTURE);
        }}
        );


    upld.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            Intent intent=new Intent(Intent.ACTION_PICK,MediaStore.Video.Media.EXTERNAL_CONTENT_URI);
            String value = null;
            intent.putExtra(MediaStore.EXTRA_OUTPUT, value);
            startActivityForResult(intent, request_Code);



        }
    });

}
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
    switch (requestCode) 
    {
    case VIDEO_CAPTURE:
        if (resultCode == RESULT_OK) {
             Toast.makeText(this, "Video saved to:\n" +
                       data.getData(), Toast.LENGTH_LONG).show();
          } else if (resultCode == RESULT_CANCELED) {
                Toast.makeText(this, "Video recording cancelled.", 
                         Toast.LENGTH_LONG).show();
          } else {
             Toast.makeText(this, "Failed to record video", 
                         Toast.LENGTH_LONG).show();
          }
             break;

    case request_Code:
        Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage("com.google.android.youtube");
        startActivity(LaunchIntent);
        break;
    }

                }
    }