使用代码编写android UI

package cn.itcast.codeui;import android.app.Activity;import android.os.Bundle;import android.view.ViewGroup;import android.widget.EditText;import android.widget.LinearLayout;import android.widget.LinearLayout.LayoutParams;import android.widget.TextView;public class DemoActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        LinearLayout ll = new LinearLayout(this);        ll.setOrientation(LinearLayout.VERTICAL);        LinearLayout.LayoutParams params =  new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT);        ll.setLayoutParams(params);                TextView tv = new TextView(this);        tv.setText(R.string.hello);                     ll.addView(tv, ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);                EditText et = new EditText(this);        ll.addView(et, ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);        setContentView(ll);       // setContentView(R.layout.main);            }}
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