Mostra a bateria e avisa quando chega 70%

final BatteryProgressView bat = new BatteryProgressView(this);
bat.setLayoutParams(new LinearLayout.LayoutParams(250, 250));
linear1.addView(bat);
bat.setProgress(66);
final android.os.Handler handler = new android.os.Handler();
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        bat.setProgress(63);
        if (bat.getProgress() <= 70) {
            Toast.makeText(getApplicationContext(), "Battery level is low", Toast.LENGTH_SHORT).show();
        }
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                bat.setProgress(77);
                if (bat.getProgress() <= 70) {
                    Toast.makeText(getApplicationContext(), "Battery level is low", Toast.LENGTH_SHORT).show();
                }
            }
        },1000);
    }
},2000);