碼農日常大小事

今天的文章要來寫寫Android中如何抓取電池資訊的方法(BatteryManager)

電池狀態一般APP比較少，但多適用於一些顯示手機狀態的APP較常使用

但是不管，我們本來就是要什麼功能都寫的麻！哇哈哈

那來看一下成果圖(我懶...直接放靜態圖...)

這是跑手機模擬器的，所以都會是固定數值

跑我實體手機結果如下

那就，讓我們來看看程式吧

1. 理論

首先介面只有兩個TextView，這部分怎麼設置應該不需要我介紹了吧?

那麼試問，這項功能到底是如何被實踐的呢？

答案是廣播(Broadcast)

我在以前的文章也有寫過廣播，大家可以去看看我到底寫了些什麼

->碼農日常-『Android studio』Broadcast廣播的應用方法

此外，在本範例中，我們要取得的電池資訊，則皆可從BatteryManager中過濾出來

像這次我就過濾出電池狀態、電池健康、溫度等等

其實不會很難！看程式碼吧

2. 撰寫廣播

好，那首先先寫廣播的部分

想當然爾，創立一個廣播

public class MainActivity extends AppCompatActivity {
    public static final String TAG = MainActivity.class.getSimpleName()+"My";
    TextView tvResult;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tvResult = findViewById(R.id.tvResult);
        

    }
    private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            String action = intent.getAction();
            
        }
    };
}

再來，建立Filter

public class MainActivity extends AppCompatActivity {
    public static final String TAG = MainActivity.class.getSimpleName()+"My";
    TextView tvResult;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tvResult = findViewById(R.id.tvResult);
        IntentFilter mIntentFilter = new IntentFilter();
        mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(mIntentReceiver, mIntentFilter);

    }
    private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            String action = intent.getAction();
            
        }
    };
}

3. 過濾電池資訊

直接看Code最快了XD

public class MainActivity extends AppCompatActivity {
    public static final String TAG = MainActivity.class.getSimpleName()+"My";
    TextView tvResult;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tvResult = findViewById(R.id.tvResult);
        IntentFilter mIntentFilter = new IntentFilter();
        mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(mIntentReceiver, mIntentFilter);

    }
    private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            String action = intent.getAction();
            //從這邊開始                                                 
            if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {
                StringBuilder builder = new StringBuilder();

                builder.append("電池狀態: ");
                int status = intent.getIntExtra("status", 0); // 电池状态
                switch (status){
                    case BatteryManager.BATTERY_STATUS_CHARGING:
                        builder.append("充電中");
                        break;
                    case BatteryManager.BATTERY_STATUS_DISCHARGING:
                        builder.append("放電中");
                        break;
                    case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
                        builder.append("未充電");
                        break;
                    case BatteryManager.BATTERY_STATUS_FULL:
                        builder.append("電量已滿");
                        break;
                }
                builder.append("\n");

                builder.append("電池健康情形: ");
                int health = intent.getIntExtra("health", 0);
                switch (health){
                    case BatteryManager.BATTERY_HEALTH_GOOD:
                        builder.append("良好");
                        break;
                    case BatteryManager.BATTERY_HEALTH_OVERHEAT:
                        builder.append("溫度過高");
                        break;
                    case BatteryManager.BATTERY_HEALTH_DEAD:
                        builder.append("電池已耗盡");
                        break;
                    case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
                        builder.append("過電壓");
                        break;
                    case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:
                        builder.append("未知錯誤");
                        break;
                }
                builder.append("\n");

                builder.append("電池最大容量: ");
                int scale = intent.getIntExtra("scale", 0);
                builder.append(scale+"%");
                builder.append("\n");

                builder.append("電池電壓: ");
                int voltage = intent.getIntExtra("voltage", 0);
                builder.append(voltage+"mV");
                builder.append("\n");

                builder.append("電池電量: ");
                int level = intent.getIntExtra("level", 0);
                builder.append(level+"%");
                builder.append("\n");

                builder.append("電池溫度: ");
                int temperature = intent.getIntExtra("temperature", 0);
                builder.append((Math.round(temperature)/10.0)+"度");
                builder.append("\n");

                tvResult.setText(builder.toString());
            }
            //到這邊                                                     
        }
    };
}

所有的資訊都是從intent過來的，然後再用BatteryManager去做過濾

就～是這麼簡單XD

結語

這週我其實有安排要去面試，目前人正在高鐵站

所以～這篇是直得紀念地難得在外面打的文章！？(誒？

由於這週真的很忙(加上下大雨...

所以原本想要寫的主題就延後惹QQ

老樣子，這篇到這邊，如果文章有幫助..