Android电池充电显示数据

今天给自己的手机充电，老是判断是交流电充电还是USB充电，于是想做个APP显示充电时的数据，不说了，直接上代码。

package com.example.powerbattery;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

    private TextView t1;
    String plug;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        t1 = (TextView)findViewById(R.id.tx1);

        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent batteryStatus = registerReceiver(null, ifilter);

        // 是否在充电
        int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING||
                status == BatteryManager.BATTERY_STATUS_FULL;

        // 怎么充
        int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED,-1);

        boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
        boolean acCarge =chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
        if(chargePlug == BatteryManager.BATTERY_PLUGGED_USB){
            plug = "USB";
        }else if(chargePlug == BatteryManager.BATTERY_PLUGGED_AC){
            plug = "交流电";
        }

        //当前剩余电量
        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        //电量最大值
        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
    //    Double i = batteryStatus.getDoubleExtra(BatteryManager.EXTRA_SCALE, -1);
        //电量百分比
        float batteryPct = level / (float)scale;

        int temperature= batteryStatus.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, 0);
        // integer containing the current battery voltage level.
        int voltage = batteryStatus.getIntExtra(BatteryManager.EXTRA_VOLTAGE,0);

        int health = batteryStatus.getIntExtra(BatteryManager.EXTRA_HEALTH,0);
        String healthStr = "";
        switch (health){
            case BatteryManager.BATTERY_HEALTH_COLD:
                healthStr="cold";
                break;
            case BatteryManager.BATTERY_HEALTH_DEAD:
                healthStr="dead";
                break;
            case BatteryManager.BATTERY_HEALTH_GOOD:
                healthStr="good";
                break;
            case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
                healthStr="voer voltage";
                break;
            case BatteryManager.BATTERY_HEALTH_UNKNOWN:
                healthStr="unknown";
                break;
            case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:
                healthStr="unspecified failure";
                break;
        }

        t1.setText("是否在充电：" + isCharging);
        t1.append("\n是否USB充电：" + usbCharge);
        t1.append("\n是否交流电充电：" + acCarge);
        t1.append("\n充电方式：" + plug);
        t1.append("\n电量百分比：" + (batteryPct * 100) + "%");
        t1.append("\n电池状态:"+healthStr);
        t1.append("\n电池温度:"+temperature);
        t1.append("\n电池电压:"+voltage);

    }

}

结果图: