Question

你好，我试图显示一个TextView的字符串。我动态地这样做，这是代码：

   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);

，但它在this.layout.addView(tv);上遇到错误。你能告诉我我做错了什么吗？

提前多多感谢！

更新（完整活动代码）：

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);
}

Answer 1

删除this，仅删除layout.addView(tv);。使用this仅用于引用实例变量。（任何方法之外的类中的变量）

Android：使用textView显示字符串

1 个答案: