enable or disable NFC

最新推荐文章于 2024-11-29 14:38:51 发布

原创最新推荐文章于 2024-11-29 14:38:51 发布 · 360 阅读

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本文介绍了一个在Android环境下使用Java语言修改NFC设备开关状态的代码实现，包括必要的权限设置和异常处理。代码通过创建线程来调用NFC管理类的方法，实现NFC的开启和关闭功能。

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This code works on API 15, haven't checked it against other verions yet

public boolean changeNfcEnabled(Context context, boolean enabled) {
    // Turn NFC on/off
    final boolean desiredState = enabled;
    mNfcAdapter = NfcAdapter.getDefaultAdapter(context);

    if (mNfcAdapter == null) {
        // NFC is not supported
        return false;
    }

    new Thread("toggleNFC") {
        public void run() {
            Log.d(TAG, "Setting NFC enabled state to: " + desiredState);
            boolean success = false;
            Class<?> NfcManagerClass;
            Method setNfcEnabled, setNfcDisabled;
            boolean Nfc;
            if (desiredState) {
                try {
                    NfcManagerClass = Class.forName(mNfcAdapter.getClass().getName());
                    setNfcEnabled   = NfcManagerClass.getDeclaredMethod("enable");
                    setNfcEnabled.setAccessible(true);
                    Nfc             = (Boolean) setNfcEnabled.invoke(mNfcAdapter);
                    success         = Nfc;
                } catch (ClassNotFoundException e) {
                } catch (NoSuchMethodException e) {
                } catch (IllegalArgumentException e) {
                } catch (IllegalAccessException e) {
                } catch (InvocationTargetException e) {
                }
            } else {
                try {
                    NfcManagerClass = Class.forName(mNfcAdapter.getClass().getName());
                    setNfcDisabled  = NfcManagerClass.getDeclaredMethod("disable");
                    setNfcDisabled.setAccessible(true);
                    Nfc             = (Boolean) setNfcDisabled.invoke(mNfcAdapter);
                    success         = Nfc;
                } catch (ClassNotFoundException e) {
                } catch (NoSuchMethodException e) {
                } catch (IllegalArgumentException e) {
                } catch (IllegalAccessException e) {
                } catch (InvocationTargetException e) {
                }
            }
            if (success) {
                Log.d(TAG, "Successfully changed NFC enabled state to "+ desiredState);
            } else {
                Log.w(TAG, "Error setting NFC enabled state to "+ desiredState);
            }
        }
    }.start();
    return false;
}

This requires 2 permissions though, put them in the manifest:

 <!-- change NFC status toggle -->
    <uses-permission android:name="android.permission.NFC" />
    <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />

The NFC button's state switches accordingly when the code is used, so there are no issues when doing it manually in the seetings menu.
the fact that this ofcourse will only work on rooted devices! One can't write secure settings or settings unless the app is installed as a system app.

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