Android(安卓)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>

<action
android:name="android.intent.action.BOOT_COMPLETED">
</action>
</intent-filter>
</receiver>

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