在 Android 应用程序中使用 Intent 显示另一个活动 [英] Using Intent in an Android application to show another activity

问题描述

在我的 Android 应用程序中，我有两个活动类.我在第一个按钮上有一个按钮，我想在单击时显示第二个按钮，但出现错误.以下是课程:

In my Android application, I have two activity classes. I have a button on the first one and I want to show the second when it is clicked, but I get an error. Here are the classes:

public class FirstActivity extends Activity {

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

    Button orderButton = (Button)findViewById(R.id.order);

    orderButton.setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View view) {
        Intent intent = new Intent(FirstActivity.this, OrderScreen.class);
        startActivity(intent);
      }

    });
  }
}

当按钮被点击时应该显示的第二个类，但从来没有:

The second class that should show when the button is clicked, but never does:

public class OrderScreen extends Activity {

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.order);

    Button orderButton = (Button) findViewById(R.id.end);

    orderButton.setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View view) {
        finish();
      }

    });
  }
}

如何创建一个按钮来显示第二个活动?

How do I create a button that will show the second activity?

推荐答案

问题是 OrderScreen Activity 没有添加到 AndroidManifest.xml.一旦我将其添加为应用程序节点，它就可以正常工作.

The issue was the OrderScreen Activity wasn't added to the AndroidManifest.xml. Once I added that as an application node, it worked properly.

<activity android:name=".OrderScreen" />

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