Question

为什么这不起作用：

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    private EditText Name;
    private TextView output;

    public void buttonOnClick(View v){
        Button button = (Button) v;
        Name = (EditText) findViewById(R.id.editText);
        output = (TextView) findViewById(R.id.textView);
        output.setText(Name.getText());
    }
}

它也没有给出错误。

Answer 1

    private EditText Name;
    private TextView output;
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Name = (EditText) findViewById(R.id.editText);
        output = (TextView) findViewById(R.id.textView);
        button = (Button) findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            // Perform action on click
                output.setText(Name.getText().toString());
            }
        });
    }

Answer 2

您是否在activity_main.xml中的按钮的onClick标记中传递了buttonOnClick方法？像android：onClick =＆＃34; buttonOnClick＆＃34;。

请分享您的activity_main.xml文件。

在Android Studio中输出输入的文本

2 个答案: