Android(安卓)绘制电池电量图标（含充电状态）。

Android 绘制电池电量图标在视频播放等全屏情况下有用到。
先在布局文件中写一个ImageView

<?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:id="@+id/activity_main2"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:background="@color/colorAccent"    tools:context="com.example.mybluetooth.Main2Activity">        <ImageView        android:id="@+id/image_battery"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:layout_marginLeft="300dp"        android:src="@drawable/battery"/>RelativeLayout>

准备好两张电池电量图片（满和空），在drawable中定义battery.xml。

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android" >        <item>        <bitmap android:src="@drawable/battery_empty" />    item>         <item android:id="@+id/clip_drawable">        <clip            android:clipOrientation="horizontal"            android:drawable="@drawable/battery_full"            android:gravity="left" />    item>layer-list>

在Activity中实现。

public class Main2Activity extends AppCompatActivity {    private ClipDrawable clipDrawable;    private int currentPower = 0;    private boolean isCharging = false;    private Handler handler = new Handler();    private boolean canAnimater;    private  ImageView imageBattery;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main2);         imageBattery = (ImageView) findViewById(R.id.image_battery);        LayerDrawable layerDrawable = (LayerDrawable) imageBattery.getDrawable();        clipDrawable = (ClipDrawable) layerDrawable.findDrawableByLayerId(R.id.clip_drawable);    }    @Override    protected void onResume() {        super.onResume();        canAnimater =true;        handler.removeCallbacks(chargingRunnable);        handler.post(chargingRunnable);        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);        intentFilter.addAction(Intent.ACTION_POWER_CONNECTED);        intentFilter.addAction(Intent.ACTION_POWER_DISCONNECTED);        registerReceiver(batteryChangedReceiver, intentFilter);    }    @Override    protected void onPause() {        super.onPause();        canAnimater=false;        unregisterReceiver(batteryChangedReceiver);        handler.removeCallbacks(chargingRunnable);    }    // 电量变化广播    // TODO 假设进入Activity之前就已经在充电，进入之后无法收到充电的广播    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;                currentPower = power;                clipDrawable.setLevel(calculateLevel(power));            } else {                int status = intent.getIntExtra("status", currentPower);                if (Intent.ACTION_POWER_CONNECTED.equals(intent.getAction())) {                    isCharging = true;                } else if (Intent.ACTION_POWER_DISCONNECTED.equals(intent.getAction())) {                    isCharging = false;                }                Toast.makeText(Main2Activity.this, "充电：" + isCharging + "," + status, Toast.LENGTH_SHORT).show();                if (isCharging) {                    handler.removeCallbacks(chargingRunnable);                    handler.post(chargingRunnable);                }                //在自定义充电状态的图片时在这里//                else {//                    imageBattery.setImageResource(R.drawable.battery_full);//                }            }        }    };    private int calculateLevel(int progress) {        int leftOffest = dip2px(this, 2);        int powerLength = dip2px(this, 26.5f);// 40 px in hdpi        int totalLength = dip2px(this, 32.5f);// 49 px in hdpi        int level = (leftOffest + powerLength * progress / 100) * 10000 / totalLength;        return level;    }    private int dip2px(Context context, float v) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (v * scale + 0.5f);    }    private Runnable chargingRunnable = new Runnable() {        @Override        public void run() {            Log.e("test", "isCharging:" + isCharging + ",canAnimater:" + canAnimater);            if (!isCharging || !canAnimater) {                return;            }           // imageBattery.setImageResource(R.drawable.battery_empty); 充电状态图片            ValueAnimator animator = ValueAnimator.ofInt(100, currentPower, 100);            animator.setDuration(1500);            animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {                @Override                public void onAnimationUpdate(ValueAnimator animation) {                    int animatedValue = (Integer) animation.getAnimatedValue();                    clipDrawable.setLevel(calculateLevel(animatedValue));                }            });            animator.addListener(new AnimatorListenerAdapter() {                @Override                public void onAnimationEnd(Animator animation) {                    if (isCharging && canAnimater) {                        handler.postDelayed(chargingRunnable, 600);                    } else {                        clipDrawable.setLevel(calculateLevel(currentPower));                    }                }            });            animator.start();        }    };}

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