android - How to get battery charging state and method

activity_main.xml 
 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="16dp"     tools:context=".MainActivity"     android:background="#b6c9a5"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textSize="30dp"         android:textColor="#000"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcode;  import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.BatteryManager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Window; import android.widget.TextView; import android.widget.Toast;   public class MainActivity extends AppCompatActivity {     private Context mContext;     private TextView mTextView;      // Initialize a new BroadcastReceiver instance     private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {         @Override         public void onReceive(Context context, Intent intent) {             Toast.makeText(mContext, "Received", Toast.LENGTH_SHORT).show();              /*                 BatteryManager                     The BatteryManager class contains strings and constants used for values in the                     ACTION_BATTERY_CHANGED Intent, and provides a method for querying battery                     and charging properties.             */             /*                 public static tanggapan String EXTRA_STATUS                     Extra for ACTION_BATTERY_CHANGED: integer containing the current                     status constant.                      Constant Value: "status"             */              // Get the battery status indicator integer value             int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS,-1);              // Determine the battery charging status             boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING                                  ||                                  status == BatteryManager.BATTERY_STATUS_FULL;              // If battery is in charging states, then get the charging method             if(isCharging){                 // Display the battery charging states                 mTextView.setText("Charging : Yes.");                  /*                     public static tanggapan String EXTRA_PLUGGED                         Extra for ACTION_BATTERY_CHANGED: integer indicating whether the device is                         plugged in to a power source; 0 means it is on battery, other constants are                         different types of power sources.                          Constant Value: "plugged"                 */                 int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED,-1);                  /*                     public static tanggapan int BATTERY_PLUGGED_USB                         Power source is a USB port.                         Constant Value: 2 (0x00000002)                 */                 // Determine that the battery power source is usb or not                 boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;                 if(usbCharge){                     mTextView.setText(mTextView.getText()+"\nUSB Charging");                 }                  /*                     public static tanggapan int BATTERY_PLUGGED_AC                         Power source is an AC charger.                         Constant Value: 1 (0x00000001)                 */                 // Determine that the battery power source is ac or not                 boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;                 if(acCharge){                     mTextView.setText(mTextView.getText()+"\nAC Charging");                 }                  /*                     public static tanggapan int BATTERY_PLUGGED_WIRELESS                         Added in API level 17                         Power source is wireless.                         Constant Value: 4 (0x00000004)                 */                 // Determine that the battery power source is wireless or not                 boolean wirelessCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_WIRELESS;                 if(wirelessCharge){                     mTextView.setText(mTextView.getText()+"\nWireless Charging");                 }             }else {                 // Display the battery charging state                 mTextView.setText("Charging : No.");             }         }     };      @Override     protected void onCreate(Bundle savedInstanceState) {         // Request window feature action kafe         requestWindowFeature(Window.FEATURE_ACTION_BAR);         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the application context         mContext = getApplicationContext();          // Initialize a new IntentFilter instance         IntentFilter iFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);          // Register the broadcast receiver         mContext.registerReceiver(mBroadcastReceiver,iFilter);          // Get the widgets reference from XML layout         mTextView = (TextView) findViewById(R.id.tv);     } }
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