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很简单，首先加载Drawable，在onMeasure设置好其区域大小，

public class ProgressView extends ImageView {
       private Drawable maskDraw;    /**     * 加载的进度 0-100     */    private int mProcess = 20;    public ProgressView(Context context, AttributeSet attrs) {        super(context, attrs);        maskDraw = context.getResources().getDrawable(R.drawable.red_bg);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        // 保存当前画笔的状态        canvas.save();        int topline = (int) (getHeight() - getHeight() * getProcess() / 100);        /*         * canvas 剪切出一个区域，使在这个区域里面的内容是有效的，区域之外是无效的。         */        canvas.clipRect(0, topline, getWidth(), getHeight());        maskDraw.draw(canvas);        // 恢复到之前保存的状态        canvas.restore();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        maskDraw.setBounds(0, 0, getWidth(), getHeight());    }    public float getProcess() {        return mProcess;    }    /**     * 设置新的进度以后，自动刷新     */    public void setProgress(int mProcess) {        if (mProcess > 100) {            this.mProcess = 100;        }        if (mProcess < 0) {            this.mProcess = 0;        }        this.mProcess = mProcess;        invalidate();    }}

使用方法

public class ProgressActivity extends Activity {
       private ProgressView piv;    private int pivDeep = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_progressview);        piv = (ProgressView) findViewById(R.id.my_pro_iv);        handler.sendEmptyMessage(2);    }    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {            case 1:                piv.setProgress(pivDeep);                break;            case 2:                new Thread() {                    public void run() {                        while (true) {                            pivDeep = (pivDeep + 5) % 100;                            handler.sendEmptyMessage(1);                            try {                                Thread.sleep(200);                            } catch (InterruptedException e) {                                e.printStackTrace();                            }                        }                    };                }.start();                break;            default:                break;            }        }    };}

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