使用 Java 代碼動態改變按鈕的大小

我們可以使用 Java 碼, 通過改變佈局參數(LayoutParams)來改變按鈕的大小.

實例:

package com.AndroidButtonSize;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;

public class AndroidButtonSizeActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        final Button button = (Button)findViewById(R.id.button);
        button.setOnClickListener(new Button.OnClickListener(){

   public void onClick(View v) {
    // TODO Auto-generated method stub
    LayoutParams params = button.getLayoutParams();
       params.width = 300;
       params.height = 200;
       button.setLayoutParams(params);
   }});
    }
}