android - DisplayMessageActivity.java 上的 MyFirstApp android 教程错误

Question

我一直在关注它，但我遇到了 3 个 TextView 错误教程:http://developer.android.com/training/basics/firstapp/starting-activity.html我收到 2 个错误，说 textView 无法解析，一个说 textView 无法解析为变量。帮助!

@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Get the message from the intent
    Intent intent = getIntent();
    String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);

    // Create the text view
    TextView textview = new TextView(this);
    textView.setTextSize(40);
    textView.setText(message);

    // Set the text view as the activity layout
    setContentView(textView);

    setContentView(R.layout.activity_display_message);
    // Show the Up button in the action bar.
    setupActionBar();

`

Answer 1

您已将其声明为 textview(小写“v”)但引用它为 textView(大写“v”)。选择一个!

TextView textView = new TextView(this); // Change the "v" to uppercase
textView.setTextSize(40);
textView.setText(message);