java - 错误: onCreate(Bundle) is already defined in this activity

Question

作为 Android 应用程序开发新手，我试图学习使用 Intent 连接两个 Activity 。我尝试了书中的代码。它不断抛出错误，指出“onCreate(Bundle)”已在 MainActivity 类和 NewActivity 类中定义。如果我能找到解决方案，将会有很大帮助。

MainActivity.class

public class MainActivity extends Activity {

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

    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.activity_new);

        View view = getWindow().getDecorView().findViewById(android.R.id.content);
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent startIntent = new Intent(MainActivity.this, NewActivity.class);
                startActivity(startIntent);
            }
        });

    }

NewActivity.class

public class NewActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.activity_new);
    }
}

Answer 1

如果你想连接这些 Activity ，你必须这样做:

public class MainActivity extends Activity {

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

        View view = getWindow().getDecorView().findViewById(android.R.id.content);
    view.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent startIntent = new Intent(MainActivity.this, NewActivity.class);
            startActivity(startIntent);
        }
    });

}

然后在第二个 Activity 中删除:

  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.activity_new);
}

并复制此内容:

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

它会起作用的。