cordova - 如何在需要时获取 cordova 2.9 的电池电量？

Question

window.addEventListener("batterystatus", onBatteryStatus, false);
        function onBatteryStatus(info) {
            // Handle the online event
            console.log("Level: " + info.level + " isPlugged: " + info.isPlugged); 
        }

我想获取 cordova Phone-Gap 2.9 中的电池电量。他们提供此信息来获取电池电量和状态

但它只能触发电池状态变化，但在我们需要时无法触发。有没有办法获取 Cordova 的电池电量？

Answer 1

无法在需要时获取电池电量。该方法仅在电池状态更改或电池电量更改时触发。这里我编写了一个插件，用于随时随地获取电池电量。

在源文件夹中创建这些java文件

在源文件夹中创建 Bat_lev 插件

package org.apache.cordova.example;

import org.apache.cordova.api.CallbackContext;
import org.apache.cordova.api.CordovaPlugin;
import org.json.JSONArray;
import org.json.JSONException;

import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;







public class Bat_lev 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) {


    PowerConnectionReceiver p1=new PowerConnectionReceiver();
    Context context=cordova.getActivity();
    IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    Intent batteryStatus = context.registerReceiver(null, ifilter);
    p1.onReceive(cordova.getActivity(), batteryStatus);

        callbackContext.success(""+ p1.BAT_LEVEL);
    }




}

下面的java类向我们提供电池电量

package org.apache.cordova.example;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.BatteryManager;

public class PowerConnectionReceiver extends BroadcastReceiver {

    static int BAT_LEVEL;

    @Override
    public void onReceive(Context context, Intent intent) {


        int currentLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        int level = -1;
        if (currentLevel >= 0 && scale > 0) {
        level = (currentLevel * 100) / scale;
        }
        BAT_LEVEL = level;
    }
}

编写此 JavaScript 代码来获取电池电量

 function bat_level() {
        window.echo = function(str, callback) {
            cordova.exec(callback, function(err) {
                callback('Nothing to echo.');
            }, "Bat_lev", "echo", [str]);
        };

        window.echo("echome", function(echoValue) {
            console.log(echoValue);
            localStorage.bat_level=echoValue;//u can use this value anywhere u want
        });

    }

并确保将此行添加到 config.xml

<feature name="Bat_lev" >
        <param
            name="android-package"
            value="org.apache.cordova.example.Bat_lev" />
    </feature>