Android自定义View实现水平带数字百分比进度条

public class NumberProgressView extends View {   /**   * 进度条画笔的宽度（dp）   */  private int paintProgressWidth = 3;   /**   * 文字百分比的字体大小（sp）   */  private int paintTextSize = 20;   /**   * 左侧已完成进度条的颜色   */  private int paintLeftColor = 0xff67aae4;   /**   * 右侧未完成进度条的颜色   */  private int paintRightColor = 0xffaaaaaa;   /**   * 百分比文字的颜色   */  private int paintTextColor = 0xffff0077;   /**   * Contxt   */  private Context context;   /**   * 主线程传过来进程 0 - 100   */  private int progress;   /**   * 得到自定义视图的宽度   */  private int viewWidth;   /**   * 得到自定义视图的Y轴中心点   */  private int viewCenterY;   /**   * 画左边已完成进度条的画笔   */  private Paint paintleft = new Paint();   /**   * 画右边未完成进度条的画笔   */  private Paint paintRight = new Paint();   /**   * 画中间的百分比文字的画笔   */  private Paint paintText = new Paint();   /**   * 要画的文字的宽度   */  private int textWidth;   /**   * 画文字时底部的坐标   */  private float textBottomY;   /**   * 包裹文字的矩形   */  private Rect rect = new Rect();   /**   * 文字总共移动的长度（即从0%到100%文字左侧移动的长度）   */  private int totalMovedLength;   public NumberProgressView(Context context, AttributeSet attrs) {    super(context, attrs);    this.context = context;    // 构造器中初始化数据    initData();  }   /**   * 初始化数据   */  private void initData() {     //设置进度条画笔的宽度    int paintProgressWidthPx = Utils.dip2px(context, paintProgressWidth);     //设置百分比文字的尺寸    int paintTextSizePx = Utils.sp2px(context, paintTextSize);     // 已完成进度条画笔的属性    paintleft.setColor(paintLeftColor);    paintleft.setStrokeWidth(paintProgressWidthPx);    paintleft.setAntiAlias(true);    paintleft.setStyle(Style.FILL);     // 未完成进度条画笔的属性    paintRight.setColor(paintRightColor);    paintRight.setStrokeWidth(paintProgressWidthPx);    paintRight.setAntiAlias(true);    paintRight.setStyle(Style.FILL);     // 百分比文字画笔的属性    paintText.setColor(paintTextColor);    paintText.setTextSize(paintTextSizePx);    paintText.setAntiAlias(true);    paintText.setTypeface(Typeface.DEFAULT_BOLD);   }   @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    super.onMeasure(widthMeasureSpec, heightMeasureSpec);    getWidthAndHeight();  }   /**   * 得到视图等的高度宽度尺寸数据   */  private void getWidthAndHeight() {     //得到包围文字的矩形的宽高    paintText.getTextBounds("000%", 0, "000%".length(), rect);    textWidth = rect.width();    textBottomY = viewCenterY + rect.height() / 2;     //得到自定义视图的高度    int viewHeight = getMeasuredHeight();    viewWidth = getMeasuredWidth();    viewCenterY = viewHeight / 2;    totalMovedLength = viewWidth - textWidth;   }   @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);     //得到float型进度    float progressFloat = progress / 100.0f;     //当前文字移动的长度    float currentMovedLentgh = totalMovedLength * progressFloat;     //画左侧已经完成的进度条，长度为从Veiw左端到文字的左侧    canvas.drawLine(0, viewCenterY, currentMovedLentgh, viewCenterY, paintleft);     //画右侧未完成的进度条，这个进度条的长度不是严格按照百分比来缩放的，因为文字的长度会变化，所以它的长度缩放比例也会变化    if (progress < 10) {      canvas.drawLine(currentMovedLentgh + textWidth * 0.5f, viewCenterY, viewWidth, viewCenterY, paintRight);    } else if (progress < 100) {      canvas.drawLine(currentMovedLentgh + textWidth * 0.75f, viewCenterY, viewWidth, viewCenterY, paintRight);    } else {      canvas.drawLine(currentMovedLentgh + textWidth, viewCenterY, viewWidth, viewCenterY, paintRight);    }     //画文字(注意：文字要最后画，因为文字和进度条可能会有重合部分，所以要最后画文字，用文字盖住重合的部分)    canvas.drawText(progress + "%", currentMovedLentgh, textBottomY, paintText);  }   /**   * @param progress 外部传进来的当前进度   */  public void setProgress(int progress) {    this.progress = progress;    invalidate();  }}

public class NumberProgressBarActivity extends Activity {   protected static final int WHAT_INCREASE = 1;  private NumberProgressView np_numberProgressBar;  private int progress;   private Handler handler = new Handler() {    public void handleMessage(android.os.Message msg) {      progress++;      np_numberProgressBar.setProgress(progress);      handler.sendEmptyMessageDelayed(WHAT_INCREASE, getRadomNumber(50, 200));      if (progress >= 100) {        handler.removeMessages(WHAT_INCREASE);      }    }  };   @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_number_progress_bar);    np_numberProgressBar = (NumberProgressView) findViewById(R.id.np_numberProgressBar);    Button btn_numberProgressBar = (Button) findViewById(R.id.btn_numberProgressBar);    btn_numberProgressBar.setOnClickListener(new OnClickListener() {      @Override      public void onClick(View v) {        increase();      }    });  }   private void increase() {    progress = 0;    np_numberProgressBar.setProgress(0);    handler.removeMessages(WHAT_INCREASE);    handler.sendEmptyMessage(WHAT_INCREASE);  }   /**   * 得到两个整数之间的一个随机数   *   * @param start 较小的数   * @param end  较大的数   * @return   */  public int getRadomNumber(int start, int end) {    return (int) (start + Math.random() * (end - start));  }}

/**   * 将dip或dp值转换为px值，保证尺寸大小不变   */  public static int dip2px(Context context, float dipValue) {    final float scale = context.getResources().getDisplayMetrics().density;    return (int) (dipValue * scale + 0.5f);  }   /**   * 将sp值转换为px值，保证文字大小不变   */  public static int sp2px(Context context, float spValue) {    final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;    return (int) (spValue * fontScale + 0.5f);  }

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"       android:layout_width="match_parent"       android:layout_height="match_parent"       android:orientation="vertical">   <com.example.viewdemo.view.NumberProgressView    android:id="@+id/np_numberProgressBar"    android:layout_width="wrap_content"    android:layout_height="100dp"    android:layout_margin="20dp"    android:background="#33890075"    />   <Button    android:id="@+id/btn_numberProgressBar"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="开始"/> </LinearLayout>