package com.example.androiddynamiclayout;
import java.util.LinkedList;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.text.InputType;
import android.view.Gravity;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
public class MainActivity extends Activity {
// 外围的LinearLayout容器
private LinearLayout llContentView;
private EditText etContent1;
// “+”按钮控件List
private LinkedList<ImageButton> listIBTNAdd;
// “+”按钮ID索引
private int btnIDIndex = 1000;
// “-”按钮控件List
private LinkedList<ImageButton> listIBTNDel;
private int iETContentHeight = 0; // EditText控件高度
private float fDimRatio = 1.0f; // 尺寸比例（实际尺寸/xml文件里尺寸）
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initCtrl();
}
/**
* 初始化控件
*/
private void initCtrl()
{
llContentView = (LinearLayout) this.findViewById(R.id.content_view);
etContent1 = (EditText) this.findViewById(R.id.et_content1);
listIBTNAdd = new LinkedList<ImageButton>();
listIBTNDel = new LinkedList<ImageButton>();
// “+”按钮（第一个）
ImageButton ibtnAdd1 = (ImageButton) this.findViewById(R.id.ibn_add1);
ibtnAdd1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 获取尺寸变化比例
iETContentHeight = etContent1.getHeight();
fDimRatio = iETContentHeight / 80;
addContent(v);
}
});
listIBTNAdd.add(ibtnAdd1);
listIBTNDel.add(null); // 第一组隐藏了“-”按钮，所以为null
}
/**
* 添加一组新控件
* @param v 事件触发控件，其实就是触发添加事件对应的“+”按钮
*/
private void addContent(View v) {
if (v == null) {
return;
}
// 判断第几个“+”按钮触发了事件
int iIndex = -1;
for (int i = 0; i < listIBTNAdd.size(); i++) {
if (listIBTNAdd.get(i) == v) {
iIndex = i;
break;
}
}
if (iIndex >= 0) {
// 控件实际添加位置为当前触发位置点下一位
iIndex += 1;
// 开始添加控件
// 1.创建外围LinearLayout控件
LinearLayout layout = new LinearLayout(MainActivity.this);
LinearLayout.LayoutParams lLayoutlayoutParams = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
// 设置margin
lLayoutlayoutParams.setMargins(0, (int) (fDimRatio * 5), 0, 0);
layout.setLayoutParams(lLayoutlayoutParams);
// 设置属性
layout.setBackgroundColor(Color.argb(255, 162, 205, 90)); // #FFA2CD5A
layout.setPadding((int) (fDimRatio * 5), (int) (fDimRatio * 5),
(int) (fDimRatio * 5), (int) (fDimRatio * 5));
layout.setOrientation(LinearLayout.VERTICAL);
// 2.创建内部EditText控件
EditText etContent = new EditText(MainActivity.this);
LinearLayout.LayoutParams etParam = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, iETContentHeight);
etContent.setLayoutParams(etParam);
// 设置属性
etContent.setBackgroundColor(Color.argb(255, 255, 255, 255)); // #FFFFFFFF
etContent.setGravity(Gravity.LEFT);
etContent.setInputType(InputType.TYPE_TEXT_FLAG_MULTI_LINE);
etContent.setPadding((int) (fDimRatio * 5), 0, 0, 0);
etContent.setTextSize(16);
// 将EditText放到LinearLayout里
layout.addView(etContent);
// 3.创建“+”和“-”按钮外围控件RelativeLayout
RelativeLayout rlBtn = new RelativeLayout(MainActivity.this);
RelativeLayout.LayoutParams rlParam = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
// rlParam.setMargins(0, (int) (fDimRatio * 5), 0, 0);
rlBtn.setPadding(0, (int) (fDimRatio * 5), 0, 0);
rlBtn.setLayoutParams(rlParam);
// 4.创建“+”按钮
ImageButton btnAdd = new ImageButton(MainActivity.this);
RelativeLayout.LayoutParams btnAddParam = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
// 靠右放置
btnAddParam.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
btnAdd.setLayoutParams(btnAddParam);
// 设置属性
btnAdd.setBackgroundResource(R.drawable.ic_add);
btnAdd.setId(btnIDIndex);
// 设置点击操作
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
addContent(v);
}
});
// 将“+”按钮放到RelativeLayout里
rlBtn.addView(btnAdd);
listIBTNAdd.add(iIndex, btnAdd);
// 5.创建“-”按钮
ImageButton btnDelete = new ImageButton(MainActivity.this);
btnDelete.setBackgroundResource(R.drawable.ic_delete);
RelativeLayout.LayoutParams btnDeleteAddParam = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
btnDeleteAddParam.setMargins(0, 0, (int) (fDimRatio * 5), 0);
// “-”按钮放在“+”按钮左侧
btnDeleteAddParam.addRule(RelativeLayout.LEFT_OF, btnIDIndex);
btnDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deleteContent(v);
}
});
// 将“-”按钮放到RelativeLayout里
rlBtn.addView(btnDelete, btnDeleteAddParam);
listIBTNDel.add(iIndex, btnDelete);
// 6.将RelativeLayout放到LinearLayout里
layout.addView(rlBtn);
// 7.将layout同它内部的所有控件加到最外围的llContentView容器里
llContentView.addView(layout, iIndex);
btnIDIndex++;
}
}
/**
* 删除一组控件
* @param v 事件触发控件，其实就是触发删除事件对应的“-”按钮
*/
private void deleteContent(View v) {
if (v == null) {
return;
}
// 判断第几个“-”按钮触发了事件
int iIndex = -1;
for (int i = 0; i < listIBTNDel.size(); i++) {
if (listIBTNDel.get(i) == v) {
iIndex = i;
break;
}
}
if (iIndex >= 0) {
listIBTNAdd.remove(iIndex);
listIBTNDel.remove(iIndex);
// 从外围llContentView容器里删除第iIndex控件
llContentView.removeViewAt(iIndex);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}