android - 单击按钮时 setContentView 不起作用

Question

请帮助我编写代码。

当我单击任何按钮时，button1、button2 或 button3 打开新 Activity ，但布局是空的，没有任何文本和其他内容。

调用新 Activity 的 Activity 代码:

package com.novator.inweld;

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;

public class TentsCatalog extends Activity implements OnClickListener
{
    private Button button1;
    private Button button2;
    private Button button3;

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

        button1 = (Button)findViewById(R.id.button1);
        button2 = (Button)findViewById(R.id.button2);
        button3 = (Button)findViewById(R.id.button3);

        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
        button3.setOnClickListener(this);
    }

    @Override
    public void onClick(View view)
    {
        if(view == button1)
        {
            Intent intent = new Intent(this, TentPage.class);
            intent.putExtra("tentId", "1");
            startActivity(intent);
        }

        if(view == button2)
        {
            Intent intent = new Intent(this, TentPage.class);
            intent.putExtra("tentId", "2");
            startActivity(intent);
        }

        if(view == button3)
        {
            Intent intent = new Intent(this, TentPage.class);
            intent.putExtra("tentId", "3");
            startActivity(intent);
        }
    }
}

我的新 Activity 代码:

package com.novator.inweld;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class TentPage extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        Intent intent= getIntent();
        String tentId = intent.getStringExtra("tentId");

        if(tentId == "1")
        {
            setContentView(R.layout.tent1);
        }

        if(tentId == "2")
        {
            setContentView(R.layout.tent2);
        }

        if(tentId == "3")
        {
            setContentView(R.layout.tent3);
        }
    }

}

Answer 1

使用 equals()，而不是 ==

if(tentId.equals("1"))