Android在布局中动态添加view的两种方法

一、说明

    添加视图文件的时候有两种方式:1、通过在xml文件定义layout；2、java代码编写

二、前言说明

1.构造xml文件

2.LayoutInflater

提到addview，首先要了解一下LayoutInflater类。这个类最主要的功能就是实现将xml表述的layout转化为View的功能。为了便于理解，我们可以将它与findViewById()作一比较，二者都是实例化某一对象，不同的是findViewById()是找xml布局文件下的具体widget控件实例化，而LayoutInflater找res/layout/下的xml布局文件来实例化的。

(1)创建

LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);或

LayoutInflater inflater = LayoutInflater.from(Activity.this);或

LayoutInflater inflater = getLayoutInflater();

这三种方法本质是相同的。

(2)inflate()

用LayoutInflater.inflate() 将LayOut文件转化成VIew。

View view = inflater.inflate(R.layout.block_gym_album_list_item, null);

3.添加视图文件

三、步骤
    1、通过在xml文件定义layout(block_gym_album_list_item.xml)
     

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:core="http://schemas.android.com/apk/res/com.gxtag.gym"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    android:padding="5dp" >    <ImageView        android:id="@+id/iv_head_album"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/defaulthead" /></LinearLayout>

2、main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/ll_parent"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:orientation="vertical" >    <include        android:layout_width="fill_parent"        android:layout_height="wrap_content"        layout="@layout/block_head_back" /></LinearLayout>

3、DynamicViewActivity.xml

package com.gxtag.gym.ui;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.LinearLayout;import android.widget.LinearLayout.LayoutParams;import android.widget.TextView;import com.gxtag.gym.R;import com.icq.app.widget.StatedButton;public class DynamicViewActivity extends Activity implements OnClickListener{private Context mContext;private TextView mTv_title;private String title = "动态添加布局";private StatedButton mSbtn_back;private LinearLayout mLl_parent;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_dynamic);mContext=this;initView();mLl_parent.addView(addView1());mLl_parent.addView(addView2());}private void initView() {// TODO 初始化视图mLl_parent=(LinearLayout) findViewById(R.id.ll_parent);mTv_title = (TextView) findViewById(R.id.tv_title);mTv_title.setText(String.format(String.format(getResources().getString(R.string.title), title)));mSbtn_back = (StatedButton) findViewById(R.id.sbtn_navback);mSbtn_back.setOnClickListener(this);}    private View addView1() {// TODO 动态添加布局(xml方式)LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(                 LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT); //LayoutInflater inflater1=(LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);//LayoutInflater inflater2 = getLayoutInflater();LayoutInflater inflater3 = LayoutInflater.from(mContext);View view = inflater3.inflate(R.layout.block_gym_album_list_item, null);view.setLayoutParams(lp);return view;}private View addView2() {// TODO 动态添加布局(java方式)LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(                 LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT); LinearLayout view = new LinearLayout(this);         view.setLayoutParams(lp);//设置布局参数         view.setOrientation(LinearLayout.HORIZONTAL);// 设置子View的Linearlayout// 为垂直方向布局         //定义子View中两个元素的布局         ViewGroup.LayoutParams vlp = new ViewGroup.LayoutParams(                 ViewGroup.LayoutParams.WRAP_CONTENT,                 ViewGroup.LayoutParams.WRAP_CONTENT);         ViewGroup.LayoutParams vlp2 = new ViewGroup.LayoutParams(                 ViewGroup.LayoutParams.WRAP_CONTENT,                 ViewGroup.LayoutParams.WRAP_CONTENT);                  TextView tv1 = new TextView(this);         TextView tv2 = new TextView(this);         tv1.setLayoutParams(vlp);//设置TextView的布局         tv2.setLayoutParams(vlp2);         tv1.setText("姓名:");         tv2.setText("李四");         tv2.setPadding(calculateDpToPx(50), 0, 0, 0);//设置边距         view.addView(tv1);//将TextView 添加到子View 中         view.addView(tv2);//将TextView 添加到子View 中         return view; }private int calculateDpToPx(int padding_in_dp){         final float scale = getResources().getDisplayMetrics().density;         return  (int) (padding_in_dp * scale + 0.5f);     } @Overridepublic void onClick(View v) {// TODO 控件单击事件switch (v.getId()) {case R.id.sbtn_navback:this.finish();break;default:break;}}}

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