在Java中创建LinearLayout - 元素不显示

我想用Java中的TextViews创建一个LinearLayout，因为元素的数量是动态指定的，因此使用XML将无法为我工作。这里是我的代码的一个小样本：在Java中创建LinearLayout - 元素不显示

public class MyActivity extends Activity { 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    LinearLayout layout = new LinearLayout(this); 
    layout.setOrientation(LinearLayout.VERTICAL); 
    layout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 


    TextView titleView = new TextView(this); 
    titleView.setWidth(LayoutParams.WRAP_CONTENT); 
    titleView.setHeight(LayoutParams.WRAP_CONTENT); 
    titleView.setTextAppearance(this, android.R.attr.textAppearanceLarge); 
    titleView.setText("Hallo Welt!"); 
    layout.addView(titleView); 

    setContentView(layout); 

} 
}

当我开始这个活动它不显示这个TextView的，但它也没有显示错误。有没有人有建议？

来源

2011-08-30 Jay

试试这个，

LinearLayout layout = new LinearLayout(this); 
     layout.setOrientation(LinearLayout.VERTICAL); 
     layout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 

     TextView titleView = new TextView(this); 
     LayoutParams lparams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
     titleView.setLayoutParams(lparams); 
     titleView.setTextAppearance(this, android.R.attr.textAppearanceLarge); 
     titleView.setText("Hallo Welt!"); 
     layout.addView(titleView); 

     setContentView(layout);

来源

2011-08-30 09:33:29

干得好！这是错误 – Jay

试试这个

titleView.setWidth(100); 
titleView.setHeight(40);

或

titleView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

来源

2011-08-30 09:38:55 Pratik

TextView titleView = new TextView(this); 
    titleView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
    titleView.setTextAppearance(this, android.R.attr.textAppearanceLarge); 
    titleView.setText("Hallo Welt!"); 
    layout.addView(titleView); 
    setContentView(layout);

来源

2011-08-30 09:40:01 Kamal

谢谢，它的工作原理！ – Jay

使用此代码：

LinearLayout layout = new LinearLayout(this); 
    layout.setOrientation(LinearLayout.VERTICAL); 
    layout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 

    TextView titleView = new TextView(this); 
    titleView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
    titleView.setTextAppearance(this, android.R.attr.textAppearanceLarge); 
    titleView.setText("Hallo Welt!"); 
    layout.addView(titleView); 

    setContentView(layout);

来源

2011-08-30 09:47:19 SamSPICA

工作很棒！谢谢！ – Jay

在Java中创建LinearLayout - 元素不显示

回答

相关问题