问使用本机模块响应本机获取电池状态/级别

EN

#import <Foundation/Foundation.h>
#import <React/RCTBridgeModule.h>
#import <React/RCTEventEmitter.h>

@interface BatteryStatus : RCTEventEmitter <RCTBridgeModule>
@end

#import "BatteryStatus.h"

@implementation BatteryStatus
RCT_EXPORT_MODULE(BatteryStatus)

- (instancetype)init
{
 if ((self = [super init])) {

   [[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];

 }
 return self;
}

RCT_EXPORT_METHOD(hide) {
}

RCT_EXPORT_METHOD(updateBatteryLevel:(RCTResponseSenderBlock)callback)
{
 callback(@[[self getBatteryStatus]]);
}

 //manually get battery status by calling following method

-(NSDictionary*)getBatteryStatus
{

 float batteryLevel = [UIDevice currentDevice].batteryLevel;

 NSObject* currentLevel = nil;

 currentLevel = [NSNumber numberWithFloat:(batteryLevel * 100)];

 NSMutableDictionary* batteryData = [NSMutableDictionary dictionaryWithCapacity:2];

 [batteryData setObject:currentLevel forKey:@"level"];
 return batteryData;

  }

@end

package com.yourproject.BatteryStatus;

import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;

import com.facebook.react.bridge.Callback;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;

public class BatteryStatusModule extends ReactContextBaseJavaModule  {
     public BatteryStatusModule(ReactApplicationContext reactContext) {

         super(reactContext);
     }

     @Override
     public String getName() {
    return "BatteryStatus";
}

@ReactMethod
public void getBatteryStatus(Callback successCallback) {
    Intent batteryIntent = getCurrentActivity().registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
    int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
    int scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

    if(level == -1 || scale == -1) {
        level = 0;
    }
    //System.out.print("battery level");
    //System.out.print(level);
    successCallback.invoke(null ,((float)level / (float)scale) * 100.0f);
    }
 }

 package com.yourproject.BatteryStatus;

 import com.facebook.react.ReactPackage;
 import com.facebook.react.bridge.JavaScriptModule;
 import com.facebook.react.bridge.NativeModule;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.uimanager.ViewManager;

 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;

 public class BatteryStatusPackage implements ReactPackage {
@Override
public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
    List<NativeModule> modules = new ArrayList<>();

    modules.add(new BatteryStatusModule(reactContext));

    return modules;
}

@Override
public List<Class<? extends JavaScriptModule>> createJSModules() {
    return Collections.emptyList();
}

@Override
public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
    return Collections.emptyList();
}
}

componentDidMount() {
 this.getBatteryLevel((batteryLevel) => {
   console.log(batteryLevel);
 });
}

npm install --save react-native-device-info
# or
yarn add react-native-device-info

DeviceInfo.getBatteryLevel().then(batteryLevel => {
    console.log(batteryLevel);
    // 0.759999
});

-(NSArray<NSString *> *)supportedEvents{ 
  return @[@"level"];
}