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标题: 【从头学android】使用setContentView(View)这样切换界面布局 [打印本页]

作者: jekeyhui99 时间: 2015-11-29 18:31
标题: 【从头学android】使用setContentView(View)这样切换界面布局
p21.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical" android:layout_width="fill_parent"
      android:layout_height="fill_parent">
      <TextView android:id="@+id/textView1" android:text="p21"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
      <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/changeText"></Button>
</LinearLayout>

p22.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical" android:layout_width="fill_parent"
      android:layout_height="fill_parent">
      <TextView android:id="@+id/textView1" android:text="p22"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
      <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/changeText"></Button>
</LinearLayout>

这种方式将两个布局首先加载进来并缓存，这样切换时无需重复初始化

代码简化如下：

/**
*
*/
package com.itest;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

/**
* @author Robin
*/
public class ITestP2Activity extends Activity {
      Button b1;
      Button b2;
      View v1;
      View v2;

      /** Called when the activity is first created. */
      @Override
      public void onCreate( Bundle savedInstanceState )
      {
            super.onCreate( savedInstanceState );
            //缓存View1
            v1 = getLayoutInflater().inflate( R.layout.p21, null );
            //缓存View2
            v2 = getLayoutInflater().inflate( R.layout.p22, null );
            //动态修改v1中内容
            b1 = (Button) v1.findViewById( R.id.button1 );
            b1.setOnClickListener( new OnClickListener() {
                     @Override
                     public void onClick( View v )
                     {
                              jumpToDevicelistB2();
                     }
            } );

            b2 = (Button) v2.findViewById( R.id.button1 );
            b2.setOnClickListener( new OnClickListener() {
                     @Override
                     public void onClick( View v )
                     {
                              jumpToMainB1();
                     }
            } );
            //切换到v1
            setContentView( v1 );
      }

      void jumpToDevicelistB2()
      {
            setContentView( v2 );
            //无需重复初始化
      }

      void jumpToMainB1()
      {
            setContentView( v1 );
            //无需重复初始化
      }
}

转自：http://blog.csdn.net/lsj19830812/article/details/7107240

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