Android的Configuration类

1.Configuration类专门用来描述Android设备的配置信息。

2.获得Configuration类对象

Configuration config = getResources().getConfiguration();

3.各种属性介绍

（1）fontScale：字体的缩放因子

（2）keyboard：键盘类型

（3）keyboardHidden：键盘是否可用，true为不可用，false为可用。当所有的键盘（软键盘&硬件键盘）都不可用才返回true。

（4）locale：语言（本地环境）。具体的要靠理解。setting中设置语言会导致local改变。

（5）mcc：国家码

（6）mnc：网络码

（7）navigation：导航类型

（8）orientation：屏幕方向

（9）touchscreen：触摸方式

4.使用实例获得各种属性

public class MainActivity extends Activity {private TextView fontScaleTv = null;private TextView keyboardTv = null;private TextView keyboardHiddenTv = null;private TextView localeTv = null;private TextView mccTv = null;private TextView mncTv = null;private TextView navigationTv = null;private TextView orientationTv = null;private TextView touchscreenTv = null;private Button changeOrientation = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Log.d("zmq", "MainActivty onCreate");findView();Configuration config = getResources().getConfiguration();fontScaleTv.setText("字体缩放：" + config.fontScale);keyboardTv.setText("键盘：" + config.keyboard);keyboardHiddenTv.setText("键盘是否可用：" + config.keyboardHidden);localeTv.setText("语言：" + config.locale);mccTv.setText("国家码：" + config.mcc);mncTv.setText("网络码：" + config.mnc);navigationTv.setText("导航类型：" + config.navigation);orientationTv.setText("屏幕方向：" + config.orientation);touchscreenTv.setText("触摸方式：" + config.touchscreen);}private void findView() {fontScaleTv = (TextView) findViewById(R.id.fontScaleTv);keyboardTv = (TextView) findViewById(R.id.keyboardTv);keyboardHiddenTv = (TextView) findViewById(R.id.keyboardHiddenTv);localeTv = (TextView) findViewById(R.id.localeTv);mccTv = (TextView) findViewById(R.id.mccTv);mncTv = (TextView) findViewById(R.id.mncTv);navigationTv = (TextView) findViewById(R.id.navigationTv);orientationTv = (TextView) findViewById(R.id.orientationTv);touchscreenTv = (TextView) findViewById(R.id.touchscreenTv);changeOrientation = (Button) findViewById(R.id.changeOrientation);changeOrientation.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {// TODO Auto-generated method stub// get Configuration infoConfiguration config = getResources().getConfiguration();Log.d("zmq", "orientation=" + config.orientation);// current orientation is LANDSCAPE，then set to PORTRAITif (config.orientation == Configuration.ORIENTATION_LANDSCAPE) {Log.d("zmq", "change LANDSCAPE to PORTRAIT");MainActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);}// current orientation is PORTRAIT，then set to LANDSCAPEelse if (config.orientation == Configuration.ORIENTATION_PORTRAIT) {Log.d("zmq", "change PORTRAIT to LANDSCAPE");MainActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);}}});}@Overridepublic void onConfigurationChanged(Configuration newConfig) {// TODO Auto-generated method stubsuper.onConfigurationChanged(newConfig);String orientation = newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE ? "横屏": "竖屏";Toast.makeText(MainActivity.this, "orientation", Toast.LENGTH_SHORT).show();}}

<activity            android:name="com.zmq.configuration.MainActivity"            android:label="@string/app_name"             android:configChanges="orientation">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>

当改变orientation的时候，会触发onConfigurationChanged函数运行（在Android中配置configChanges属性，如果没有配置这个属性，不会触发onConfigurationChanged函数运行）。（系统属性变化时，会触发此函数回调）

点击按钮：

会重新跑onCreate函数：

5.在各个属性改变的时候，会重新跑Activity的生命周期函数，即Activity会重新启动。

要想使Activity 不重新启动，则需要：

在Manifest文件中，使用android:configChanges属性，并且可以在Activity中重写onConfigurationChanged（）方法。

例如，改变orientation：

<activity            android:name="com.zmq.configuration.MainActivity"            android:label="@string/app_name"             android:configChanges="orientation|screenSize">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>

@Overridepublic void onConfigurationChanged(Configuration newConfig) {// TODO Auto-generated method stubsuper.onConfigurationChanged(newConfig);Log.d("zmq", "onConfigurationChanged");String orientation = newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE ? "横屏": "竖屏";Toast.makeText(MainActivity.this, "orientation:"+orientation, Toast.LENGTH_SHORT).show();}

主意：在configChanges属性中，需要加上screenSize，否则还是会重启Activity。

locale的时候要加上layoutDirection。