android - 如何在主 .java 文件中添加另一个 Activity

Question

这是我的主 java 文件中的代码。我将如何制作另一个按钮来连接 Activity 。如果我表达得不够好，请告诉我。我只需要在主 java 文件中添加另一个按钮。我已经在 list 中有一个 Activity 和一个类，我只需要将另一个代码块放入主 java 文件中。按钮的 ID 是 p40，xml 布局的名称是 p40.xml，类名为 p40.java， Activity 名为 p40。这是我目前的代码:

package com.duncan.hello.world;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.duncan.hello.world.R;

public class HelloWorldActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    Button aButton;
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    aButton = (Button) this.findViewById(R.id.button1);

    aButton.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            Intent i = new Intent(HelloWorldActivity.this, OtherActivity.class);
            startActivity(i);
        }});
}
}

Answer 1

你应该这样做

// This code is copied from your code as is 
// to have a reference point as well as this is also
// code for adding click listener to button which you
// need to handle click and then do what you want.
// In this case you are launching an Activity
// Block of code you already have to use STARTS
aButton = (Button) this.findViewById(R.id.button1);

aButton.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        Intent i = new Intent(HelloWorldActivity.this, OtherActivity.class);
        startActivity(i);
    }});
// Block of code you already have to use ENDS

// This code is added for newButton which looks similar to above block
Button newButton
newButton = (Button) this.findViewById(R.id.button2);

newButton.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        Intent i = new Intent(HelloWorldActivity.this, AnOtherActivity.class);
        startActivity(i);
    }});

您必须在 layout/main.xml 文件中添加另一个 button1。