【Android-NetWork】 判断是否连接网络，判断网络连接方式

如何判断Android是否连接网络？

Java代码：

ConnectivityManager conn = (ConnectivityManager) getSystemService(Activity.CONNECTIVITY_SERVICE);
boolean wifi = conn.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();
boolean internet = conn.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();
if (wifi | internet) {
     Toast.makeText(getApplicationContext(), "网络已连接", Toast.LENGTH_LONG).show();
} else {
     Toast.makeText(getApplicationContext(), "未连接网络。", Toast.LENGTH_LONG).show();
}                

AndroidManifest.xml添加权限：

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

 

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Android判断设备网络连接状态，并判断连接方式

如何判断Android设备网络连接状态，并判断连接方式？  

--调用checkNetworkState方法--

    ConnectivityManager manager;
    /*检测网络是否连接*/
    private boolean checkNetworkState() {
        boolean flag = false;
        //得到网络连接信息
        manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        //去进行判断网络是否连接
        if (manager.getActiveNetworkInfo() != null) {
            flag = manager.getActiveNetworkInfo().isAvailable();
        }
        if (!flag) {
            setNetwork();//设置网络
        } else {
            isNetworkAvailable();//判断连接方式
        }
        return flag;
    }

    /* 网络已连接，判断连接方式 */
    private void isNetworkAvailable() {
        State gprs = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
        State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
        if (gprs == State.CONNECTED || gprs == State.CONNECTING) {
            Toast.makeText(this, "网络已连接！连接方式：gprs", Toast.LENGTH_SHORT).show();
        }
        if (wifi == State.CONNECTED || wifi == State.CONNECTING) {
            Toast.makeText(this, "网络已连接！连接方式：wifi", Toast.LENGTH_SHORT).show();
            // do something: wifi状态下才能做某事
        }
    }

    /* 网络未连接，调用设置方法 */
    private void setNetwork() {
        Toast.makeText(this, "网络未连接。", Toast.LENGTH_SHORT).show();
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setIcon(R.drawable.ic_launcher);
        builder.setTitle("网络提示信息");
        builder.setMessage("网络不可用，如果继续，请先设置网络！");
        builder.setPositiveButton("设置", new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                Intent intent = null;
                /*
                 * 判断手机系统，如果API>10 就是3.0+ 3.0以上和3.0以上设置不一样， 调用的方法不一样
                 */
                if (android.os.Build.VERSION.SDK_INT > 10) {
                    intent = new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS);
                } else {
                    intent = new Intent();
                    ComponentName component = new ComponentName("com.android.settings",
                            "com.android.settings.WirelessSettings");
                    intent.setComponent(component);
                    intent.setAction("android.intent.action.VIEW");
                }
                startActivity(intent);
            }
        });

        builder.setNegativeButton("取消", new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {

            }
        });

        builder.create();
        builder.show();

    }