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);
}

}