自定义进度条 [英] Custom ProgressBar
问题描述
我正在尝试创建一个如下所示的 ProgresBar
:
I am trying to create a ProgresBar
that looks like the following:
到目前为止,我已经创建了一个扩展 ProgressBar 的对象,现在我正在尝试弄清楚我的下一步是什么.
So far, I have created an object which extends ProgressBar, and now I am trying to figure out what my next step is.
我知道我需要用一些逻辑来覆盖 onDraw()
来决定要着色的方块数.这是微不足道的.
I know that I need to override onDraw()
with some logic that will decide how many squares to color in. This is trivial.
我不知道如何做的是首先获得这些方块.如何替换默认的可绘制对象,以便在布局中添加自定义栏时,我可以看到类似于我的图像的内容?
What I don't know how to do is get these squares in the first place. How can I replace the default drawable, so when I add my custom bar in the layout I can see something like my image?
推荐答案
试试这个自定义 Drawable:
try this custom Drawable:
class ProgressDrawable extends Drawable {
private static final int NUM_RECTS = 10;
Paint mPaint = new Paint();
@Override
protected boolean onLevelChange(int level) {
invalidateSelf();
return true;
}
@Override
public void draw(Canvas canvas) {
int level = getLevel();
Rect b = getBounds();
float width = b.width();
for (int i = 0; i < NUM_RECTS; i++) {
float left = width * i / NUM_RECTS;
float right = left + 0.9f * width / NUM_RECTS;
mPaint.setColor((i + 1) * 10000 / NUM_RECTS <= level? 0xff888888 : 0xffbbbbbb);
canvas.drawRect(left, b.top, right, b.bottom, mPaint);
}
}
@Override
public void setAlpha(int alpha) {
}
@Override
public void setColorFilter(ColorFilter cf) {
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
}
并在 onCreate 中使用以下内容对其进行测试:
and test it with the following in onCreate:
LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
final ProgressBar pb = new ProgressBar(this, null, android.R.attr.progressBarStyleHorizontal);
Drawable d = new ProgressDrawable();
pb.setProgressDrawable(d);
pb.setPadding(20, 20, 20, 0);
ll.addView(pb);
OnSeekBarChangeListener l = new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
int newProgress = pb.getMax() * progress / seekBar.getMax();
Log.d(TAG, "onProgressChanged " + newProgress);
pb.setProgress(newProgress);
}
};
int[] maxs = {4, 10, 60, 110};
for (int i = 0; i < maxs.length; i++) {
SeekBar sb = new SeekBar(this);
sb.setMax(maxs[i]);
sb.setOnSeekBarChangeListener(l);
sb.setPadding(20, 20, 20, 0);
ll.addView(sb);
}
setContentView(ll);
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