横、竖屏幕动态切换(layout-land 和layout-port)

下面是一个例子程序:
1.首先通过以下语句设置Activity为无标题和全屏模式:

// 设置为无标题栏
requestWindowFeature(Window.FEATURE_NO_TITLE);

// 设置为全屏模式
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                     WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);

2.下面给出xml文件配置,这里我们在res目录下建立layout-land和layout-port目录,相应的layout文件不变，比如main.xml。layout-land是横屏的layout,layout-port是竖屏的layout，其他的不用管模拟器自动寻找
main.xml文件如下:

  xmlns:android="http://schemas.android.com/apk/res/android"
  android:background="@drawable/white"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
>
      android:id="@+id/myTextView1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:textColor="@drawable/blue" 
    android:text="the portrait"
  />
      android:id="@+id/myButton1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/str_button1" />

这个xml文件需要在上述所说的2个文件夹下都需要放置.
3.获取资源id的view:

mButton01 = (Button) findViewById(R.id.myButton1);
mTextView01 = (TextView) findViewById(R.id.myTextView1);

4.返回当前显示Activity的显示状态(横屏还是竖屏)

// Return the current requested orientation of the activity
if (getRequestedOrientation() == -1){
   mTextView01.setText(getResources().getText(R.string.str_err_1001));
}

5.设置按钮点击监听器

/* 当点击按钮旋转屏幕画面 */
    mButton01.setOnClickListener(new Button.OnClickListener()
    {
      // @Override
      public void onClick(View arg0)
      {
        /* 方法一：重写getRequestedOrientation */

        /* 若无法取得screenOrientation属性 */
        if (getRequestedOrientation() == -1)
        {
          /* 提示无法进行画面旋转功能，因无法判别Orientation */
          mTextView01.setText(getResources().getText(R.string.str_err_1001));
        } else
        {
          if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)
          {
            /* 若当下为横排，则更改为竖排呈现 */
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
          } else if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT)
          {
            /* 若当下为竖排，则更改为横排呈现 */
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
          }
        }
      }
    });
  }

6.改变屏幕显示的函数

  @Override
  public void setRequestedOrientation(int requestedOrientation)
  {
    // TODO Auto-generated method stub

    /* 判断要更改的方向，以Toast提示 */
    switch (requestedOrientation)
    {
      /* 更改为LANDSCAPE */
      case (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE):
        mMakeTextToast(getResources().getText(R.string.str_msg1).toString(),
            false);
        break;
      /* 更改为PORTRAIT */
      case (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT):
        mMakeTextToast(getResources().getText(R.string.str_msg2).toString(),
            false);
        break;
    }
    super.setRequestedOrientation(requestedOrientation);
  }

7.获取屏幕显示状态

  @Override
  public int getRequestedOrientation()
  {
    // TODO Auto-generated method stub

    /* 此重写getRequestedOrientation方法，可取得当下屏幕的方向 */
    return super.getRequestedOrientation();
  }

8.通过一个Toast来显示屏幕状态

 public void mMakeTextToast(String str, boolean isLong)
  {
    if (isLong == true)
    {
      Toast.makeText(EX05_22.this, str, Toast.LENGTH_LONG).show();
    } else
    {
      Toast.makeText(EX05_22.this, str, Toast.LENGTH_SHORT).show();
    }
  }

9.colors.xml文件内容:

  #808080
  #FFFFFF
  #0000FF

10.strings.xml文件内容如下:

	Hello World, ScreenChangeEx
	 ScreenChangeEx 
	按我旋转屏幕
	
		请在AndroidManifest.xml\n添加android:screenOrientation属性  
	旋转为LANDSCAPE
	旋转为PORTRAIT

11.AndroidManifest.xml文件内容:

	package="cn.com" android:versionCode="1" android:versionName="1.0.0">
	
					android:screenOrientation="landscape">
			
				
				
			
		
	
 

9.程序整个ActivityMain.java文件如下:

package cn.com;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class ActivityMain extends Activity
{
  private TextView mTextView01;
  private Button mButton01;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);

    // 设置为无标题栏
    requestWindowFeature(Window.FEATURE_NO_TITLE);

    // 设置为全屏模式
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.main);

    mButton01 = (Button) findViewById(R.id.myButton1);
    mTextView01 = (TextView) findViewById(R.id.myTextView1);

    // Return the current requested orientation of the activity
    if (getRequestedOrientation() == -1)
    {
      mTextView01.setText(getResources().getText(R.string.str_err_1001));
    }

    /* 当点击按钮旋转屏幕画面 */
    mButton01.setOnClickListener(new Button.OnClickListener()
    {
      // @Override
      public void onClick(View arg0)
      {
        /* 方法一：重写getRequestedOrientation */

        /* 若无法取得screenOrientation属性 */
        if (getRequestedOrientation() == -1)
        {
          /* 提示无法进行画面旋转功能，因无法判别Orientation */
          mTextView01.setText(getResources().getText(R.string.str_err_1001));
        } else
        {
          if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)
          {
            /* 若当下为横排，则更改为竖排呈现 */
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
          } else if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT)
          {
            /* 若当下为竖排，则更改为横排呈现 */
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
          }
        }
      }
    });
  }

  @Override
  public void setRequestedOrientation(int requestedOrientation)
  {
    // TODO Auto-generated method stub

    /* 判断要更改的方向，以Toast提示 */
    switch (requestedOrientation)
    {
      /* 更改为LANDSCAPE */
      case (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE):
        mMakeTextToast(getResources().getText(R.string.str_msg1).toString(),
            false);
        break;
      /* 更改为PORTRAIT */
      case (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT):
        mMakeTextToast(getResources().getText(R.string.str_msg2).toString(),
            false);
        break;
    }
    super.setRequestedOrientation(requestedOrientation);
  }

  @Override
  public int getRequestedOrientation()
  {
    // TODO Auto-generated method stub

    /* 此重写getRequestedOrientation方法，可取得当下屏幕的方向 */
    return super.getRequestedOrientation();
  }

  public void mMakeTextToast(String str, boolean isLong)
  {
    if (isLong == true)
    {
      Toast.makeText(EX05_22.this, str, Toast.LENGTH_LONG).show();
    } else
    {
      Toast.makeText(EX05_22.this, str, Toast.LENGTH_SHORT).show();
    }
  }
}