安卓：显示字符串的TextView [英] Android: Display string with textView

问题描述

您好，我试图显示与的TextView 的字符串。我这样做动态，这是code：

 的LinearLayout布局=（的LinearLayout）this.findViewById（R.id.Layout）;
   EDITTEXT的EditText =（EditText上）this.findViewById（R.id.textView）;
   Button按钮=（按钮）this.findViewById（R.id.btnAdd）;    的LayoutParams lparams =新的LayoutParams（
            LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT）;
            TextView的电视=新的TextView（本）;
            tv.setLayoutParams（lparams）;
            tv.setText（显示）;
            this.layout.addView（电视）;
 

，但它击中 this.layout.addView（TV）的错误; 能否请你告诉我什么我做错了。

非常感谢事先！

更新（充分活动code）：

 公共类CalendarDate延伸活动{@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_calendar_date）;
    捆绑额外= getIntent（）getExtras（）。    串d日= extras.getString（CURRENTDAY）;
    串d月= extras.getString（currentmonth）;
    串d年= extras.getString（currentyear）;    动作条AB = getActionBar（）;
    ab.setTitle（d日+/+ d月+/+ d年）;    捆绑extraz = getIntent（）getExtras（）。
    字符串显示= extras.getString（EXTRA_MESSAGE）;    的setContentView（R.layout.activity_calendar_date）;   的LinearLayout布局=（的LinearLayout）this.findViewById（R.id.Layout）;
   EDITTEXT的EditText =（EditText上）this.findViewById（R.id.textView）;
   Button按钮=（按钮）this.findViewById（R.id.btnAdd）;    的LayoutParams lparams =新的LayoutParams（
            LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT）;
            TextView的电视=新的TextView（本）;
            tv.setLayoutParams（lparams）;
            tv.setText（显示）;
            layout.addView（电视）;
}
 

解决方案

删除这个，只 layout.addView（TV）; 。使用这个用于引用唯一实例变量。 （在任何方法类的外部变量）

hello i am trying to display a string with a TextView. i am doing this dynamically and this is the code:

   LinearLayout layout=(LinearLayout) this.findViewById(R.id.Layout);
   EditText  editText=(EditText) this.findViewById(R.id.textView);
   Button        button=(Button) this.findViewById(R.id.btnAdd);

    LayoutParams lparams = new LayoutParams(
            LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            TextView tv=new TextView(this);
            tv.setLayoutParams(lparams);
            tv.setText(display);
            this.layout.addView(tv);

,but it hits an error on this.layout.addView(tv); Can you please tell me what i am doing wrong?

Thanks a lot in advance!

Update(full activity code):

public class CalendarDate extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_calendar_date);
    Bundle extras = getIntent().getExtras();

    String dday = extras.getString("currentday");
    String dmonth =extras.getString("currentmonth");
    String dyear = extras.getString("currentyear");

    ActionBar ab = getActionBar();


    ab.setTitle(dday+"/"+dmonth+"/"+dyear );



    Bundle extraz =getIntent().getExtras();


    String display = extras.getString("EXTRA_MESSAGE");

    setContentView(R.layout.activity_calendar_date);

   LinearLayout layout=(LinearLayout) this.findViewById(R.id.Layout);
   EditText  editText=(EditText) this.findViewById(R.id.textView);
   Button        button=(Button) this.findViewById(R.id.btnAdd);

    LayoutParams lparams = new LayoutParams(
            LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            TextView tv=new TextView(this);
            tv.setLayoutParams(lparams);
            tv.setText(display);
            layout.addView(tv);
}

解决方案

Remove this, just layout.addView(tv);. Use this for referencing instance variables only. (Variables in the class outside of any methods)

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