java - 我如何编写一个 android cordova 插件，如果蓝牙打开则返回 1，否则返回 0？

Question

我目前正在阅读cordova文档，发现基本大纲如下:

package org.apache.cordova.plugin;

import org.apache.cordova.api.CordovaPlugin;
import org.apache.cordova.api.PluginResult;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

/**
 * This class echoes a string called from JavaScript.
 */
public class Echo extends CordovaPlugin {
    @Override
    public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
        if (action.equals("echo")) {
            String message = args.getString(0); 
            this.echo(message, callbackContext);
            return true;
        }
        return false;
    }

    private void echo(String message, CallbackContext callbackContext) {
        if (message != null && message.length() > 0) { 
            callbackContext.success(message);
        } else {
            callbackContext.error("Expected one non-empty string argument.");
        }
    }
}

这很有意义，我了解如何执行 Java 代码并将信息分派(dispatch)回调用 javascript。

但是，我看不到如何访问 android 中的 api，告诉我蓝牙是打开还是关闭。我必须导入android包吗？是否有关于此主题的文档？

感谢您的帮助

Answer 1

是的，您需要导入 BluetoothManager 和 BluetoothAdapter。

像这样:

import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothAdapter;

...

final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
private BluetoothAdapter mBluetoothAdapter;

...

if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)) {
    // BLUETOOTH is NOT SUPPORTED
    //use PackageManager.FEATURE_BLUETOOTH_LE if you need bluetooth low energy
    return false;
} else {
    mBluetoothAdapter = bluetoothManager.getAdapter();
    if (mBluetoothAdapter == null) {
        // BLUETOOTH is NOT AVAILABLE
        return false;
    } else {
        if (mBluetoothAdapter.isEnabled())
            // BLUETOOTH is TURNED ON
            return true;
        else 
            // BLUETOOTH is TURNED OFF
            return false;
    }
}

你可以阅读更多:

• Bluetooth package summary
• Bluetooth manager
• Bluetooth adapter