Android在布局中动态添加view的两种方法
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; @Override protected 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); } @Override public 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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