Android--動態添加控制項

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    [html]    [html]  package com.mrzhu.edittest;    import android.app.Activity;  import android.os.Bundle;  import android.view.ViewGroup;  import android.widget.RelativeLayout;    public class EditTestActivity extends Activity {      /** Called when the activity is first created. */      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          //自訂的帶提示文本的EditText組件          EditTextTest ed = new EditTextTest(this);          //設定從左邊140px處開始輸入文本          ed.setPadding(140, 0, 0, 0);          //裝載一個布局檔案，向這個布局中動態添加一個EditText          RelativeLayout relativeLayout = (RelativeLayout) getLayoutInflater().inflate(R.layout.main, null);          //建立一個LayoutParams對象          RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);          //設定android:layout_below屬性的值           layoutParams.addRule(RelativeLayout.BELOW, R.id.button2);          //動態添加EditText          relativeLayout.addView(ed, layoutParams);          //設定布局          setContentView(relativeLayout);      }  }   自訂的EditText控制項：[html]  www.2cto.compackage com.mrzhu.edittest;    import android.content.Context;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.Paint;  import android.util.AttributeSet;  import android.widget.EditText;    public class EditTextTest extends EditText {        public EditTextTest(Context context) {          super(context);      }            public EditTextTest(Context context, AttributeSet attrs, int defStyle) {          super(context, attrs, defStyle);      }        public EditTextTest(Context context, AttributeSet attrs) {          super(context, attrs);      }        @Override      protected void onDraw(Canvas canvas) {          Paint paint = new Paint();          paint.setTextSize(20);          paint.setColor(Color.GRAY);          canvas.drawText("輸入提示文本:", 10, getHeight() / 2 + 5, paint);          super.onDraw(canvas);      }  }   main.xml:[html]  <?xml version="1.0" encoding="utf-8"?>  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:id="@+id/linearlayout"      android:layout_width="fill_parent"      android:layout_height="fill_parent"      android:orientation="horizontal" >        <Button          android:id="@+id/button2"          android:layout_width="80dp"          android:layout_height="80dp"          android:layout_alignParentTop="true"          android:layout_centerHorizontal="true"          android:layout_marginTop="150dp"          android:onClick="click"          android:text="Button" />    </RelativeLayout>   

Android--動態添加控制項