混合使用XML布局文件和代码控制视图

本实例包含二个布局文件
activity_main.xml和text.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <TextView
        android:id="@+id/textview1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="textview1" />
    <Button 
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第一个按钮"/>
</LinearLayout>

text.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <TextView
        android:id="@+id/textview2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第二个TEXTVIEW" />

</LinearLayout>

MainActivity.main`

package com.bin.com;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity{
    private TextView textView;
    private Button button1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //获得mainACtivity.xml的LinearLayout对象
        LinearLayout linearLayout=(LinearLayout) getLayoutInflater().inflate(R.layout.activity_main, null);
       //设置当前的容器视图
        setContentView(linearLayout);
        textView=(TextView) findViewById(R.id.textview1);
        button1=(Button) findViewById(R.id.button1);
        textView.setText("第一个TEXTVIEW");
        button1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {                
                int value=textView.getGravity()&0x07;
                textView.setGravity(Gravity.CENTER_HORIZONTAL);
                if(value==Gravity.LEFT){
                    textView.setGravity(Gravity.CENTER_HORIZONTAL);
                }else if(value==Gravity.RIGHT){
                    textView.setGravity(Gravity.LEFT);
                }else if(value==Gravity.CENTER){
                    textView.setGravity(Gravity.RIGHT);
                }
            }
        });
        //获得text.xml的LinearLayout的对象
        LinearLayout linearLayout1=(LinearLayout) getLayoutInflater().inflate(R.layout.test, null);
        linearLayout.addView(linearLayout1);
        //创建新的视图对象
        EditText edittext=new EditText(this);
        edittext.setText("我是新建的EDITTEXT");
        edittext.setBackgroundColor(Color.RED);
        //将EditText对象设置成可多行输入
        edittext.setSingleLine(false);
       // 设置EditText控件的文本默认对齐方式是左对齐
        edittext.setGravity(Gravity.LEFT);
        //将edittext添加到linerLayout1中，并通过LayoutParams对象指定EditText的宽度和高度
          linearLayout.addView(edittext,new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
                ));
    }



}

运行结果

说明 ：在本例中如果把`


LinearLayout linearLayout1=(LinearLayout)getLayoutInflater().inflate(R.layout.test, null);
linearLayout.addView(linearLayout1);
如果改写成
LinearLayout linearLayout1=(LinearLayout) getLayoutInflater().inflate(R.layout.test, linearLayout);
将运行不出来 具体原来还在调查中…….