Android Studio读取电池状态/电量

难度：入门。
功能：读取电池电量、健康度、充电状态。
源代码：https://github.com/YigangFang/BatteryStatus

Fig 1

MainActivity.java

package com.rokid.batterystatus;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TextView batterLevel;
    private BroadcastReceiver batteryLevelRcvr;
    private IntentFilter batteryLevelFilter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        batterLevel = (TextView)findViewById(R.id.batteryLevel);
        monitorBatteryState();

    }

    private void monitorBatteryState(){
        batteryLevelRcvr = new BroadcastReceiver(){

            @Override
            public void onReceive(Context context, Intent intent) {
                // TODO Auto-generated method stub
                StringBuilder sb = new StringBuilder();
                int rawlevel = intent.getIntExtra("level", -1);
                int scale = intent.getIntExtra("scale", -1);
                int status = intent.getIntExtra("status", -1);
                int health = intent.getIntExtra("health", -1);
                int level = -1;
                if(rawlevel >= 0 && scale > 0){
                    level = (rawlevel*100)/scale;
                }
                sb.append("电池电量: ");
                sb.append(level + "%\n");

                String healthStatus = "";
                switch (health) {
                    case BatteryManager.BATTERY_HEALTH_UNKNOWN:
                        healthStatus = "UNKNOWN";
                        break;
                    case BatteryManager.BATTERY_HEALTH_GOOD:
                        healthStatus = "GOOD";
                        break;
                    case BatteryManager.BATTERY_HEALTH_OVERHEAT:
                        healthStatus = "OVERHEAT";
                        break;
                    case BatteryManager.BATTERY_HEALTH_DEAD:
                        healthStatus = "DEAD";
                        break;
                    case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
                        healthStatus = "OVER VOLTAGE";
                        break;
                    case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:
                        healthStatus = "UNSPECIFIED FAILURE";
                        break;
                    case BatteryManager.BATTERY_HEALTH_COLD:
                        healthStatus = "COLD";
                        break;

                }
                sb.append("健康度:" + healthStatus + "\n");

                String batteryStatus ="";
                switch (status) {
                    case BatteryManager.BATTERY_STATUS_UNKNOWN:
                        batteryStatus="[没有安装电池]";
                        break;
                    case BatteryManager.BATTERY_STATUS_CHARGING:
                        batteryStatus="[正在充电]";
                        break;
                    case BatteryManager.BATTERY_STATUS_FULL:
                        batteryStatus="[已经充满]";
                        break;
                    case BatteryManager.BATTERY_STATUS_DISCHARGING:
                        batteryStatus="[放电中]";
                        break;
                    case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
                        batteryStatus="[未充电]";
                        break;
                    default:
                        if(level <= 10)
                            sb.append("[电量过低，请充电]");
                        else if (level <= 100) {
                            sb.append("[未连接充电器]");
                        }
                        break;

                }
                sb.append(batteryStatus);

                batterLevel.setText(sb.toString());
            }

        };
        batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(batteryLevelRcvr, batteryLevelFilter);
    }

}

res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.rokid.batterystatus.MainActivity">

    <TextView
        android:id="@+id/batteryLevel"
        android:textSize="40dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

AndroidManifest.xml不需要任何改动。

充满时 使用中