Question

我一直在关注它，我遇到了3个textview错误教程：http://developer.android.com/training/basics/firstapp/starting-activity.html 我得到2错误，说textView无法解析，有人说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”），但将其引用为textView（大写“v”）。选一个！

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

Answer 2

Variables in Java are case sensitive，因此textView和textview不同。将您的代码更改为：

TextView textview = new TextView(this);
textview.setTextSize(40);
textview.setText(message);

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

DisplayMessageActivity.java上的MyFirstApp android教程错误

2 个答案: