Android在布局中动态添加view的两种方法

标签：android   布局   

    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

<?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>

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;
		}
	}

}

Android在布局中动态添加view的两种方法,布布扣,bubuko.com

Android在布局中动态添加view的两种方法

标签：android   布局   

原文地址：http://blog.csdn.net/icqapp/article/details/37502271