android简单demo学习系例之排版(LinearLayout)[code-based]

程序所用的图片

看代码

package com.scholar.luo;import android.app.Activity;import android.graphics.Color;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageButton;import android.widget.LinearLayout;/** * 基于code-based 的LinearLayout的Demo * UI-TREE * ViewGroup2 * | * ViewGroup1 iCancelButton * | * iOkButton iExitButton * @author scholar.luo * */public class LinearLayutDemo extends Activity implements OnClickListener{private ImageButton iExitButton = null;private ImageButton iOkButton = null;private Button iCancelButton = null;private final int WC = LinearLayout.LayoutParams.WRAP_CONTENT; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //ViewGroup1-包含iExitButton与iOkButton，垂直排版 LinearLayout sVerticalLayout = new LinearLayout(this); sVerticalLayout.setOrientation(LinearLayout.VERTICAL); LinearLayout.LayoutParams sLayoutParams = new LinearLayout.LayoutParams(WC, WC); iOkButton = new ImageButton(this); Drawable sBackgroundImage = this.getResources().getDrawable(R.drawable.ok); iOkButton.setImageDrawable(sBackgroundImage); iOkButton.setOnClickListener(this); iExitButton = new ImageButton(this); sBackgroundImage = this.getResources().getDrawable(R.drawable.exit); iExitButton.setImageDrawable(sBackgroundImage); iExitButton.setOnClickListener(this); sVerticalLayout.addView(iOkButton, sLayoutParams); sVerticalLayout.addView(iExitButton, sLayoutParams); //ViewGroup2-包含ViewGroup1与iCancelButton,水平排版 LinearLayout sHorizontalLayout = new LinearLayout(this); sHorizontalLayout.setOrientation(LinearLayout.HORIZONTAL); LinearLayout.LayoutParams sLayoutParams2 = new LinearLayout.LayoutParams(WC, WC); sLayoutParams2.topMargin = 30; iCancelButton = new Button(this); iCancelButton.setText("取消"); iCancelButton.setBackgroundColor(Color.RED); iCancelButton.setOnClickListener(this); sHorizontalLayout.addView(sVerticalLayout, sLayoutParams); sHorizontalLayout.addView(iCancelButton, sLayoutParams2); setContentView(sHorizontalLayout); }/** * 点击事件处理 */public void onClick(View aView) {if (aView.equals(iOkButton)) {this.setTitle("你按下了确定按钮");} else if (aView.equals(iCancelButton)) {this.setTitle("你按下了取消按钮");} else if (aView.equals(iExitButton)) {this.finish();}}}