Android显示电量——自定义电池View

源码下载地址:http://download.csdn.net/detail/feifei454498130/6462989

本文原创转载请注明地址:http://blog.csdn.net/feifei454498130/article/details/13282317

简单实现的一个显示电池的电量的View，具体看代码

public class MainActivity extends Activity {

	BatteryView mBatteryView;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mBatteryView = (BatteryView) findViewById(R.id.battery_view);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	
	@Override
	protected void onResume() {
		super.onResume();
		register();
	}
	
	@Override
	protected void onPause() {
		super.onPause();
		unregister();
	}
	
	private void register() {
		registerReceiver(batteryChangedReceiver,  new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
	}
	
	private void unregister() {
		unregisterReceiver(batteryChangedReceiver);
	}

	// 接受广播
	private BroadcastReceiver batteryChangedReceiver = new BroadcastReceiver() {
		public void onReceive(Context context, Intent intent) {
			if (Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())) {
				int level = intent.getIntExtra("level", 0);
				int scale = intent.getIntExtra("scale", 100);
				int power = level * 100 / scale;
				Log.d("Deom", "电池电量：:" + power);
				mBatteryView.setPower(power);
			}
		}
	};
}

public class BatteryView extends View{

	private int mPower = 100;
	
	public BatteryView(Context context) {
		super(context);
	}
	
	public BatteryView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}
	
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		
		int battery_left = 0;
		int battery_top = 0;
		int battery_width = 25;
		int battery_height = 15;
		
		int battery_head_width = 3;
		int battery_head_height = 3;
		
		int battery_inside_margin = 3;
		
		//先画外框
		Paint paint = new Paint();
		paint.setColor(Color.BLACK);
		paint.setAntiAlias(true);
		paint.setStyle(Style.STROKE);
		
		Rect rect = new Rect(battery_left, battery_top, 
				battery_left + battery_width, battery_top + battery_height);
		canvas.drawRect(rect, paint);
		
		float power_percent = mPower / 100.0f;
		
		Paint paint2 = new Paint(paint);
		paint2.setStyle(Style.FILL);
		//画电量
		if(power_percent != 0) {
			int p_left = battery_left + battery_inside_margin;
			int p_top = battery_top + battery_inside_margin;
			int p_right = p_left - battery_inside_margin + (int)((battery_width - battery_inside_margin) * power_percent);
			int p_bottom = p_top + battery_height - battery_inside_margin * 2;
			Rect rect2 = new Rect(p_left, p_top, p_right , p_bottom);
			canvas.drawRect(rect2, paint2);
		}
		
		//画电池头
		int h_left = battery_left + battery_width;
		int h_top = battery_top + battery_height / 2 - battery_head_height / 2;
		int h_right = h_left + battery_head_width;
		int h_bottom = h_top + battery_head_height;
		Rect rect3 = new Rect(h_left, h_top, h_right, h_bottom);
		canvas.drawRect(rect3, paint2);
	}
	
	public void setPower(int power) {
		mPower = power;
		if(mPower < 0) {
			mPower = 0;
		}
		invalidate();
	}
}

效果如下:

源码下载地址:http://download.csdn.net/detail/feifei454498130/6462989