Android(安卓)横竖屏幕切换(layout-land和layout-port)

1.首先通过以下语句设置Activity为无标题和全屏模式:

1 // 设置为无标题栏  2 requestWindowFeature(Window.FEATURE_NO_TITLE);  3   4 // 设置为全屏模式  5 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  6                      WindowManager.LayoutParams.FLAG_FULLSCREEN);  7 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:

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout    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"  >    <TextView      android:id="@+id/myTextView1"      android:layout_width="fill_parent"       android:layout_height="wrap_content"      android:textColor="@drawable/blue"       android:text="the portrait"    />    <Button      android:id="@+id/myButton1"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/str_button1" />  </LinearLayout>

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:

<?xml version="1.0" encoding="utf-8"?>  <resources>    <drawable name="darkgray">#808080    <drawable name="white">#FFFFFF    <drawable name="blue">#0000FF  </resources>

10.strings.xml文件内容如下:

<?xml version="1.0" encoding="utf-8"?>  <resources>      <string name="hello">Hello World, ScreenChangeEx</string>      <string name="app_name"> ScreenChangeEx </string>      <string name="str_button1">按我旋转屏幕</string>      <string name="str_err_1001">          请在AndroidManifest.xml\n添加android:screenOrientation属性  </string>      <string name="str_msg1">旋转为LANDSCAPE</string>      <string name="str_msg2">旋转为PORTRAIT</string>  </resources>

11.AndroidManifest.xml文件内容:

<?xml version="1.0" encoding="utf-8"?>  <manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="cn.com" android:versionCode="1" android:versionName="1.0.0">      <application android:icon="@drawable/icon" android:label="@string/app_name">          <activity android:name=".ActivityMain" android:label="@string/app_name"       android:configChanges="orientation|keyboardHidden"             android:screenOrientation="landscape">              <intent-filter>                  <action android:name="android.intent.action.MAIN" />                  <category android:name="android.intent.category.LAUNCHER" />              </intent-filter>          </activity>      </application>  </manifest>

注意：

1、不设置Activity的android:configChanges时，切屏会重新调用各个生命周期，切横屏时会执行一次，切竖屏时会执行两次
2、设置Activity的android:configChanges="orientation"时，切屏还是会重新调用各个生命周期，切横、竖屏时只会执行一次
3、设置Activity的android:configChanges="orientation|keyboardHidden"时，切屏不会重新调用各个生命周期，只会执行onConfigurationChanged方法

13.程序整个ActivityMain.java文件如下:

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();      }    }  }

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