public class NumberProgressView extends View {
/**
* 進度條畫筆的寬度(dp)
*/
private int paintProgressWidth = 3;
/**
* 文字百分比的字體大小(sp)
*/
private int paintTextSize = 20;
/**
* 左側已完成進度條的顏色
*/
private int paintLeftColor = 0xff67aae4;
/**
* 右側未完成進度條的顏色
*/
private int paintRightColor = 0xffaaaaaa;
/**
* 百分比文字的顏色
*/
private int paintTextColor = 0xffff0077;
/**
* Contxt
*/
private Context context;
/**
* 主線程傳過來進程 0 - 100
*/
private int progress;
/**
* 得到自定義視圖的寬度
*/
private int viewWidth;
/**
* 得到自定義視圖的Y軸中心點
*/
private int viewCenterY;
/**
* 畫左邊已完成進度條的畫筆
*/
private Paint paintleft = new Paint();
/**
* 畫右邊未完成進度條的畫筆
*/
private Paint paintRight = new Paint();
/**
* 畫中間的百分比文字的畫筆
*/
private Paint paintText = new Paint();
/**
* 要畫的文字的寬度
*/
private int textWidth;
/**
* 畫文字時底部的座標
*/
private float textBottomY;
/**
* 包裹文字的矩形
*/
private Rect rect = new Rect();
/**
* 文字總共移動的長度(即從0%到100%文字左側移動的長度)
*/
private int totalMovedLength;
public NumberProgressView(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
// 構造器中初始化數據
initData();
}
/**
* 初始化數據
*/
private void initData() {
//設置進度條畫筆的寬度
int paintProgressWidthPx = Utils.dip2px(context, paintProgressWidth);
//設置百分比文字的尺寸
int paintTextSizePx = Utils.sp2px(context, paintTextSize);
// 已完成進度條畫筆的屬性
paintleft.setColor(paintLeftColor);
paintleft.setStrokeWidth(paintProgressWidthPx);
paintleft.setAntiAlias(true);
paintleft.setStyle(Style.FILL);
// 未完成進度條畫筆的屬性
paintRight.setColor(paintRightColor);
paintRight.setStrokeWidth(paintProgressWidthPx);
paintRight.setAntiAlias(true);
paintRight.setStyle(Style.FILL);
// 百分比文字畫筆的屬性
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();
}
/**
* 得到視圖等的高度寬度尺寸數據
*/
private void getWidthAndHeight() {
//得到包圍文字的矩形的寬高
paintText.getTextBounds("000%", 0, "000%".length(), rect);
textWidth = rect.width();
textBottomY = viewCenterY + rect.height() / 2;
//得到自定義視圖的高度
int viewHeight = getMeasuredHeight();
viewWidth = getMeasuredWidth();
viewCenterY = viewHeight / 2;
totalMovedLength = viewWidth - textWidth;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//得到float型進度
float progressFloat = progress / 100.0f;
//當前文字移動的長度
float currentMovedLentgh = totalMovedLength * progressFloat;
//畫左側已經完成的進度條,長度爲從Veiw左端到文字的左側
canvas.drawLine(0, viewCenterY, currentMovedLentgh, viewCenterY, paintleft);
//畫右側未完成的進度條,這個進度條的長度不是嚴格按照百分比來縮放的,因爲文字的長度會變化,所以它的長度縮放比例也會變化
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);
}
//畫文字(注意:文字要最後畫,因爲文字和進度條可能會有重合部分,所以要最後畫文字,用文字蓋住重合的部分)
canvas.drawText(progress + "%", currentMovedLentgh, textBottomY, paintText);
}
/**
* @param progress 外部傳進來的當前進度
*/
public void setProgress(int progress) {
this.progress = progress;
invalidate();
}
}
調用者activity的代碼,設置進度條的進度:
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);
}
/**
* 得到兩個整數之間的一個隨機數
*
* @param start 較小的數
* @param end 較大的數
* @return
*/
public int getRadomNumber(int start, int end) {
return (int) (start + Math.random() * (end - start));
}
}
工具方法:
/**
* 將dip或dp值轉換爲px值,保證尺寸大小不變
*/
public static int dip2px(Context context, float dipValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dipValue * scale + 0.5f);
}
/**
* 將sp值轉換爲px值,保證文字大小不變
*/
public static int sp2px(Context context, float spValue) {
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}
佈局:
<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="開始"/>
</LinearLayout>