android自定义LinearLayout和View

自定义线性布局经常用到：

第一种是在扩展的LinearLayout构造函数中使用Inflater加载一个布局，并从中提取出相关的UI组件进行封装，形成一个独立的控件。在使用该控件时，由于它所有的子元素都是在运行时通过代码动态创建的，所以该控件只能以一个独立控件的形式在Layout文件中声明，例如：

public class CustomLayout extends LinearLayout{

       public  CustomLayout(Context context){
                 LayoutInflater mInflater = LayoutInflater.from(context);
                View myView = mInflater.inflate(R.layout.receive, null);
                addView(myView);

       }
}

< LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  androidundefinedrientation="vertical" >
  <LinearLayout
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          androidundefinedrientation="horizontal">
          <TextView
                   android:layout_width="wrap_content"
                  android:layout_height="wrap_content" />
         <Button
                 android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:id="@+id/button" />
  </LinearLayout>

           <TextView
                   android:layout_width="wrap_content"
                  android:layout_height="wrap_content" />        

< /LinearLayout>

实例：

imagebtn.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="46dp"
        android:layout_height="46dp"

        android:layout_gravity="center_vertical"
        android:layout_marginRight="10dp"
        android:src="@drawable/confirm" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:text="确定"
        android:textSize="25dp" />

</LinearLayout>

MyLinearLayout1.java

package com.hust.customlinearlayout;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MyLinearLayout1 extends LinearLayout {
	private ImageView imageView;
	private TextView  textView;
	public MyLinearLayout1(Context context){
		super(context);
	}
	public MyLinearLayout1(Context context, AttributeSet attrs) {
		super(context, attrs);
		LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		inflater.inflate(R.layout.imagebtn, this);
		imageView=(ImageView) findViewById(R.id.imageView1);
		textView=(TextView)findViewById(R.id.textView1);	

	}

	public void setImageResource(int resId){
		imageView.setImageResource(resId);
	}
	public void setTextViewText(String text){
		textView.setText(text);
	}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:orientation="horizontal" >

    <com.hust.customlinearlayout.MyLinearLayout1
        android:id="@+id/btn_right"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        />

    <com.hust.customlinearlayout.MyLinearLayout1
        android:id="@+id/btn_error"
        android:layout_marginLeft="5dp"
         android:layout_weight="1"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"

        />

</LinearLayout>

package com.hust.customlinearlayout;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
    private MyLinearLayout1 myLinearLayout1;
    private MyLinearLayout1 myLinearLayout2;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		myLinearLayout1=(MyLinearLayout1) findViewById(R.id.btn_right);
		myLinearLayout2=(MyLinearLayout1) findViewById(R.id.btn_error);

		myLinearLayout1.setTextViewText("确定");
		myLinearLayout2.setTextViewText("取消");
		myLinearLayout1.setImageResource(R.drawable.confirm);
		myLinearLayout2.setImageResource(R.drawable.cancle);
		myLinearLayout1.setOnClickListener(new View.OnClickListener() {

			public void onClick(View v) {
				// TODO Auto-generated method stub
				Toast.makeText(getApplicationContext(), "点击的正确按钮", 1).show();
			}
		});

		myLinearLayout2.setOnClickListener(new View.OnClickListener() {

			public void onClick(View v) {
				// TODO Auto-generated method stub
				Toast.makeText(getApplicationContext(), "点击的错误按钮", 1).show();
			}
		});

	}

}

第二种方式是：这个自定义VIEW中的任何控件都不是通过XML文件来定义的，而是在JAVA代码中通过动态生成的，然后再addView()加入到你自定义的View中，

private class SpeechView extends LinearLayout {  

        private TextView mTitle;
        private TextView mDialogue;  

        public SpeechView(Context context, String title, String words) {
            super(context);
            this.setOrientation(VERTICAL);
             // Here we build the child views in code. They could also have  

            // been specified in an XML file.
            mTitle = new TextView(context);
            mTitle.setText(title);
            addView(mTitle, new LinearLayout.LayoutParams(  

                   LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

             mDialogue = new TextView(context);
            mDialogue.setText(words);
            addView(mDialogue, new LinearLayout.LayoutParams(
                    LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

        } 

       /**
        * Convenience method to set the title of a SpeechView
         */         

       public void setTitle(String title) {
                      mTitle.setText(title);  

       }       

         /**
         * Convenience method to set the dialogue of a SpeechView 

        */  

       public void setDialogue(String words) {
                mDialogue.setText(words);
        }  

      }