Android--动态添加控件

 

 

 

 

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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);  

        //自定义的带提示文本的EditText组件  

        EditTextTest ed = new EditTextTest(this);  

        //设置从左边140px处开始输入文本  

        ed.setPadding(140, 0, 0, 0);  

        //装载一个布局文件，向这个布局中动态添加一个EditText  

        RelativeLayout relativeLayout = (RelativeLayout) getLayoutInflater().inflate(R.layout.main, null);  

        //创建一个LayoutParams对象  

        RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);  

        //设置android:layout_below属性的值   

        layoutParams.addRule(RelativeLayout.BELOW, R.id.button2);  

        //动态添加EditText  

        relativeLayout.addView(ed, layoutParams);  

        //设置布局  

        setContentView(relativeLayout);  

    }  

}  

 

自定义的EditText控件：

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package 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("输入提示文本:", 10, getHeight() / 2 + 5, paint);  

        super.onDraw(canvas);  

    }  

}  

 

main.xml:

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<?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>