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Android学习笔记_31_通过后台代码生成View对象以及动态加载XML布局文件到LinearLayout

2014-02-26 17:07 741 查看
  一、布局文件part.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="64dp"
android:text="添加" />

<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10" >

<requestFocus />
</EditText>

</RelativeLayout>


  二、通过后台代码生成前台布局:

package com.example.codeui;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout layout=new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);//显示方向

//将view对象添加到布局界面
TextView textView =new TextView(this);
textView.setText("Hello Code UI");
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
//添加
layout.addView(textView,params);

//添加外部xml定义的布局
View view = getPartView();
layout.addView(view);

ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.FILL_PARENT);
setContentView(layout, layoutParams);
//setContentView(R.layout.activity_main);
//采用代码编写效率高,但是很难维护
}

//通过加载xml文件将view添加到布局中
public View getPartView() {
//将xml布局文件生成view对象通过LayoutInflater
LayoutInflater inflater =(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//将view对象挂载到那个父元素上,这里没有就为null
return inflater.inflate(R.layout.part, null);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}


 
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