文本未在模拟器中显示 [英] Text not getting displayed in emulator

问题描述

使用以下代码，我无法从MainActivity.java中向模拟器显示文本值Set in Java。我只能看到普通模拟器。下面我提交strings.xml，textview和java的代码。



strings.xml：

 <  资源 >  
 
 <   string    名称  =  app_name > 我的应用程序<   / string  >  
 <   string     name   =  textview > @ string / textview<   / string  >  
 < span class =code-keyword><   string     name   =  action_settings > 设置<   / string   >  
 
 <   / resources  >  
 
 ------ 
 <   textview  >  
 android：id =@ + id / main_textview
 android：text = @ string / textview
 android：layout_width =wrap_content
 android：layout_height = wrap_content
 android：layout_marginLeft =20dp
 android：layout_marginTop =20dp
 
 /> 

-----

  import  android.support.v7.app.ActionBarActivity; 
  import  android.os.Bundle; 
  import  android.view.Menu; 
  import  android.view.MenuItem; 
  import  android.widget.TextView; 
 
 
  public   class  MainActivity  extends  ActionBarActivity {
 TextView mainTextView; 
  @覆盖 
 受保护  void  onCreate（Bundle savedInstanceState）{
  super  .onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_main）; 
 
  //   1.访问布局XML中定义的TextView  
  //  然后设置其文本 
 mainTextView =（TextView）findViewById（R.id .main_textview）; 
 mainTextView.setText（ 在Java中设置！）; 
 
} 

解决方案

您的XML文件错误，您拼写了所有小写的textview（ textview 而不是 TextView ），并且您的开始标记有一个右括号（>）。它应该是：

 <   TextView   
   
                  < span class =code-attribute> android：id   =  @ + id / main_textview  
   
                   android：text   =  @ string / textview  
   
                   android：layout_width   =  wrap_content  
   
                   android：layout_height   =   wrap_content  
   
                   android：layout_marginLeft   =  20dp  
   
                   android：layout_marginTop   =  20dp  
   
     
   
           /  >  

Using the following code I am unable to show from MainActivity.java the text value 'Set in Java' on to the emulator. I am able to see the plain emulator only. Hereunder I submit the code for strings.xml, textview and java.

strings.xml:

<resources>

    <string name="app_name">My Application</string>
    <string name="textview">"@string/textview"</string>
    <string name="action_settings">Settings</string>

</resources>

------
 <textview>
        android:id="@+id/main_textview"
        android:text="@string/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="20dp"

    />

-----

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity {
    TextView mainTextView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 1. Access the TextView defined in layout XML
        // and then set its text
        mainTextView = (TextView) findViewById(R.id.main_textview);
        mainTextView.setText("Set in Java!");

    }

解决方案

Your XML file is wrong, you have spelled textview in all lower case (textview instead of TextView), and your opening tag has a closing brace (>). It should be:

<TextView

        android:id="@+id/main_textview"

        android:text="@string/textview"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginLeft="20dp"

        android:layout_marginTop="20dp"

 

    />

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