Android判斷網絡是否連接，跳轉到設置頁面以及判斷連接的是什麼網絡

如果擬開發一個網絡應用的程序，首先考慮是否接入網絡，在Android手機中判斷是否聯網可以通過ConnectivityManager 類的isAvailable()方法判斷，首先獲取網絡通訊類的實例 ConnectivityManager cwjManager=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);  ，使用cwjManager.getActiveNetworkInfo().isAvailable(); 來返回是否有效，如果爲True則表示當前Android手機已經聯網，可能是WiFi或GPRS、HSDPA等等，具體的可以通過ConnectivityManager 類的getActiveNetworkInfo() 方法判斷詳細的接入方式，需要注意的是有關調用需要加入<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>  這個權限，android開發網提醒大家在真機上Market和Browser程序都使用了這個方法，來判斷是否繼續，同時在一些網絡超時的時候也可以檢查下網絡連接是否存在，以免浪費手機上的電力資源

判斷網絡是否連接資源地址：http://download.csdn.net/detail/u014649598/7966901

 

 

一、判斷網絡連接是否可用，不可用跳轉到設置界面

@Override
    protected void onStart() {
    	AlertDialog.Builder builder=new Builder(this);
    	
				//檢查用戶的網絡情況
		        ConnectivityManager cm=(ConnectivityManager) MainActivity.this.getSystemService(Context.CONNECTIVITY_SERVICE);
		        //返回當前可用網絡信息
		        
		        NetworkInfo info=cm.getActiveNetworkInfo();
		        if(info!=null&&info.isConnected()){
		        	Toast.makeText(MainActivity.this, "網絡可用", 0).show();
		        	
		        }else{
		        	Toast.makeText(MainActivity.this, "網絡不可用", 0).show();
		        	builder.setTitle("提醒");
		        	builder.setMessage("當前網絡不可用，點擊確定設置網絡");
		        	builder.setPositiveButton("確定", new OnClickListener() {
		    			
		    			@Override
		    			public void onClick(DialogInterface dialog, int which) {
		        	Intent intent=new Intent();
		        	intent.setClassName("com.android.settings", "com.android.settings.Settings");
		        	startActivity(intent);
		        }
			}
		);
		        	builder.create().show();
		        }
    	
    	super.onStart();
    }

二、使用ConnectionChangeReceiver判斷網絡是否可用

 

public class MainActivity extends Activity {
	private ConnectionChangeReceiver myReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //用廣播判斷
        myReceiver=new ConnectionChangeReceiver();
		this.registerReceiver(myReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));  
    }
public class ConnectionChangeReceiver extends BroadcastReceiver
    {
    	@Override
    	public void onReceive(Context context, Intent intent) {
    		ConnectivityManager connectivityManager = (ConnectivityManager)
    				context.getSystemService(Context.CONNECTIVITY_SERVICE);
    		NetworkInfo mobworkInfo = connectivityManager
    				.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
    		NetworkInfo wifiworkInfo = connectivityManager
    				.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
    		boolean IsNetConnected = mobworkInfo.isConnected();
    		boolean IsWifiConnected = wifiworkInfo.isConnected();
    		if(IsNetConnected || IsWifiConnected){
    			System.out.println("網絡打開");
    			Log.e("wankai", "wankai");
    			boolean isConnected = true;			
    		}else{
    			boolean isConnected = false;
    			System.out.println("網絡關閉");	
    			Log.e("wankai2", "wangguan");
    		}
    	}		
    }


}

三、判斷GPS是否打開

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

 

四、判斷WIFI是否打開

public static boolean isWifiEnabled(Context context) {   
        ConnectivityManager mgrConn = (ConnectivityManager) context   
                .getSystemService(Context.CONNECTIVITY_SERVICE);   
        TelephonyManager mgrTel = (TelephonyManager) context   
                .getSystemService(Context.TELEPHONY_SERVICE);   
        return ((mgrConn.getActiveNetworkInfo() != null && mgrConn   
                .getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel   
                .getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);   
    } 

 

五、判斷是否是3G網絡

public static boolean is3rd(Context context) {   
        ConnectivityManager cm = (ConnectivityManager) context   
                .getSystemService(Context.CONNECTIVITY_SERVICE);   
        NetworkInfo networkINfo = cm.getActiveNetworkInfo();   
        if (networkINfo != null   
                && networkINfo.getType() == ConnectivityManager.TYPE_MOBILE) {   
            return true;   
        }   
        return false;   
    }  

 

六、判斷是wifi還是3g網絡,用戶的體現性在這裏了，wifi就可以建議下載或者在線播放。

public static boolean isWifi(Context context) {   
            ConnectivityManager cm = (ConnectivityManager) context   
                    .getSystemService(Context.CONNECTIVITY_SERVICE);   
            NetworkInfo networkINfo = cm.getActiveNetworkInfo();   
            if (networkINfo != null   
                    && networkINfo.getType() == ConnectivityManager.TYPE_WIFI) {   
                return true;   
            }   
            return false;   
        }