Java/XML - 更改 TextView [英] Java/XML - Change TextView

问题描述

谁能解释一下为什么这段代码不起作用?我想用 Java 代码更改 textview 的文本，但没有任何变化.

Can someone explain me why this code doesn't work? I want to change the text of the textview with Java code but nothing changes.

package com.example.gethtml;

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

public class MainActivity extends Activity {

    GetCode getCode = new GetCode();
    Affiche affiche = new Affiche();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        try {
            getCode.getCode();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

推荐答案

通过java代码改变textview文本的代码应该至少包含一个TextView对象从...开始.我在您的代码中看不到这一点.但我正在为此编写示例代码.

Code to change the textview's text through java code should contain at least one TextView object to start with. I can not see that in your code. But I am writing below a sample code for that.

setContentView(R.layout.activity_main);
TextView txtView = (TextView) findViewById(R.id.txtview);
txtView.setText("This is changed text");

您的 activity_main.xml 应包含用您所指的 id 定义的 TextView.希望有帮助.

Your activity_main.xml should contain TextView defined with id you are referring. Hope it helps.

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