Android 备忘录

1.获取mac地址



2.全屏
一是在代码中设置，另一种方法是在配置文件里改！

一、在代码中设置:

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//无title  
requestWindowFeature(Window.FEATURE_NO_TITLE);  
//全屏  
getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN ,    
WindowManager.LayoutParams. FLAG_FULLSCREEN);         
setContentView(R.layout.main);
}
}

设置全屏的俩段代码必须在setContentView(R.layout.main) 之前，不然会报错。

二、在配置文件里修改(android:theme="@android:style/Theme.NoTitleBar.Fullscreen"):



3、网络状态

<uses-permission
android:name="android.permission.ACCESS_NETWORK_STATE" />

  private boolean getNetWorkStatus() {

    boolean netSataus = false;
    ConnectivityManager cwjManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    cwjManager.getActiveNetworkInfo();

    if (cwjManager.getActiveNetworkInfo() != null) {
    netSataus = cwjManager.getActiveNetworkInfo().isAvailable();
    }

    if (!netSataus) {
    Builder b = new AlertDialog.Builder(this).setTitle("没有可用的网络")
    .setMessage("是否对网络进行设置？");
    b.setPositiveButton("是", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {
    Intent mIntent = new Intent("/");
    ComponentName comp = new ComponentName(
    "com.android.settings",
    "com.android.settings.WirelessSettings");
    mIntent.setComponent(comp);
    mIntent.setAction("android.intent.action.VIEW");
    startActivityForResult(mIntent,0);
    }
    }).setNeutralButton("否", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {
    dialog.cancel();
    }
    }).show();
    }

    return netSataus;
    }



4 .判断GPS状态

    public boolean isGpsEnabled(Context context)
    {
        LocationManager locationManager =((LocationManager)context.getSystemService(Context.LOCATION_SERVICE));
        List<String> accessibleProviders = locationManager.getProviders(true);
        return accessibleProviders != null && accessibleProviders.size() > 0;
    }





5.禁止横屏幕 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR);



6.禁用重复加载
    1. 修改AndroidManifest.xml文件，在activity标签下面增加参数：

< activity android:name="MyActivity"
android:configChanges="orientation|keyboardHidden">

    2.在MyActivity 中重载onConfigurationChanged（每次切屏的时候会自动调用）方法，初始化横竖屏方向不同的显示界面，以及其他数据的初始化操作：

@Override

public void onConfigurationChanged(Configuration newConfig) {

   super.onConfigurationChanged(newConfig);

if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
           //加入横屏要处理的代码

}else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {

           //加入竖屏要处理的代码

}


}





7、开机启动程序

1)public class StartupReceiver extends BroadcastReceiver {

  @Override
  public void onReceive(Context context, Intent intent) {
    Intent startupintent = new Intent(context,StrongTracks.class);
    startupintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(startupintent);
  }

}
2)<receiver
android:name=".StartupReceiver">
<intent-filter>
<!-- 系统启动完成后会调用 -->
<action
android:name="android.intent.action.BOOT_COMPLETED">
</action>
</intent-filter>
</receiver>