java - 问题在布局中创建了一个按钮(Android)？

Question

我尝试在一个布局中使用两个按钮:

• 一个笔记按钮，在下面工作
• 计算器按钮(button10)

我在 super.oncreate 上收到此错误:

"The method onCreate(Bundle) is undefined for the type Object" 

ma​​in.java:

public class IzzynActivity extends Activity{

    /** Called when the activity is first created. */
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button wg = (Button) findViewById(R.id.button1);
        wg.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Intent myIntent = new Intent(IzzynActivity.this, notes.class);
                IzzynActivity.this.startActivity(myIntent);
            }

            public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);

                Button wg = (Button) findViewById(R.id.button10);
                wg.setOnClickListener(new View.OnClickListener() {
                    public void onClick(View view) {
                        Intent intent = new Intent(IzzynActivity.this, calculator.class);
                        setResult(RESULT_OK, intent);
                        finish();
                    }
        });

            }


}
    }
}

Answer 1

我不知道你做了什么，但你已经把你的代码弄乱了。我的假设是，您一直在复制教程而没有阅读实际发生的内容，因此并没有真正理解您在做什么。

您的代码应如下所示(未经测试，我刚刚输入，但这就是要点)。

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // find the first button and set an on click listener
        Button wg = (Button) findViewById(R.id.button1);
        wg.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Intent myIntent = new Intent(IzzynActivity.this, notes.class);
                IzzynActivity.this.startActivity(myIntent);
            }
        });

        // find the next button and set an on click listener
        Button otherButton = (Button)findViewById(R.id.button10);
        otherButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view){
                Intent intent = new Intent(IzzynActivity.this, calculator.class);
                setResult(RESULT_OK, intent);
                finish();
            }
        });

}