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:
Java代码 
// 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:
Java代码
<?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:
Java代码
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)
Java代码
// 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
Java代码
/* 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
Java代码
@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
Java代码
@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
Java代码
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:
Java代码
<?xml version="1.0" encoding="utf-8"?>
<resources>
<drawable name="darkgray">#808080</drawable>
<drawable name="white">#FFFFFF</drawable>
<drawable name="blue">#0000FF</drawable>
</resources>
10.strings.xml文件内容如下:
Java代码
<?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:
Java代码
<?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:screenOrientation="landscape">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
9.程序整个ActivityMain.java文件如下:
Java代码
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();
}
}
}