Java ScrollView.scrollTo方法代码示例

import android.widget.ScrollView; //导入方法依赖的package包/类
@Override
@SuppressWarnings("unchecked")
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    // Initialize the Watson Conversation Service and instantiate the Message Log.
    conversationService = new ConversationService(ConversationService.VERSION_DATE_2016_07_11);
    conversationService.setUsernameAndPassword(getString(R.string.watson_conversation_username),
            getString(R.string.watson_conversation_password));
    conversationLog = new ArrayList<>();

    // If we have a savedInstanceState, recover the previous Context and Message Log.
    if (savedInstanceState != null) {
        conversationContext = (Map<String, Object>) savedInstanceState.getSerializable("context");
        conversationLog = (ArrayList<ConversationMessage>) savedInstanceState.getSerializable("backlog");

        // Repopulate the UI with the previous Messages.
        if (conversationLog != null) {
            for (ConversationMessage message : conversationLog) {
                addMessageFromUser(message);
            }
        }

        final ScrollView scrollView = (ScrollView) findViewById(R.id.message_scrollview);
        scrollView.scrollTo(0, scrollView.getBottom());
    } else {
        // Validate that the user's credentials are valid and that we can continue.
        // This also kicks off the first Conversation Task to obtain the intro message from Watson.
        ValidateCredentialsTask vct = new ValidateCredentialsTask();
        vct.execute();
    }

    ImageButton sendButton = (ImageButton) findViewById(R.id.send_button);
    sendButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            TextView entryText = (TextView) findViewById(R.id.entry_text);
            String text = entryText.getText().toString();

            if (!text.isEmpty()) {
                // Add the message to the UI.
                addMessageFromUser(new ConversationMessage(text, USER_USER));

                // Record the message in the conversation log.
                conversationLog.add(new ConversationMessage(text, USER_USER));

                // Send the message to Watson Conversation.
                ConversationTask ct = new ConversationTask();
                ct.execute(text);

                entryText.setText("");
            }
        }
    });

    // Core SDK must be initialized to interact with Bluemix Mobile services.
    BMSClient.getInstance().initialize(getApplicationContext(), BMSClient.REGION_UK);


}