Android 中的饼图进度条

Question

嗨，我想在 android 中制作一个饼状进度条，如附图所示。

我已经完成了以下代码，但没有收获。在此输入链接描述

所以我决定编写自己的ProgressBarView。这是我的示例代码..

public class PieProgressView extends View {

private float mProgress;

private int MAX_ANGLE = 360;


public PieProgressView(Context context) {
    super(context);
}

public PieProgressView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public PieProgressView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}



@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    drawOval(canvas);

}

public void setProgress(int progress){
    mProgress = (float) ((float)progress*3.6);
    invalidate();
}

private void drawOval(Canvas canvas){
    canvas.drawColor(Color.CYAN);
    Paint paint = new Paint();
    // smooths
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(Color.RED);
    RectF oval2 = new RectF(50, 50, 500, 500);
    canvas.drawOval(oval2, paint);// opacity

    Paint p = new Paint();
    p.setColor(Color.BLACK);
    canvas.drawArc(oval2, 270, mProgress, true, p);
    System.out.println("drawOval Progress == "+mProgress);


    //p.setAlpha(0x80); //
}

}

我称之为活动课..

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    button = (Button)findViewById(R.id.button);
    pieProgressView = (PieProgressView)findViewById(R.id.pieprogress);

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            fillProgress();
        }
    });

}

private void fillProgress(){
    for(int i=0;i<100 ; i++) {

            pieProgressView.setProgress(i);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();

        }
    }
}

现在，在此 for 循环期间，没有显示任何进度，但在 for 循环完成后，它将显示进度条，如附图所示，显示黑色进度。

谁能告诉我这段代码有什么问题。为什么这段代码不进行持续更新？

Answer 1

我实现它就像

<ProgressBar
        android:id="@+id/pr_progress_in_circle"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="24dp"
        android:layout_height="24dp"
        android:indeterminate="false"
        android:max="100"
        android:progress="60"
        android:progressDrawable="@drawable/progress"
        android:rotation="-90" />

其中进度.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">


    <item
        android:bottom="@dimen/dimen_2"
        android:left="@dimen/dimen_2"
        android:right="@dimen/dimen_2"
        android:top="@dimen/dimen_2">
        <shape android:shape="oval">
            <solid android:color="@color/grey_lighter" />
            <stroke android:color="@android:color/transparent" />
        </shape>
    </item>
    <item>
        <shape
            android:innerRadiusRatio="100"
            android:shape="ring"
            android:thicknessRatio="2.5"
            android:useLevel="true">
            <gradient
                android:centerColor="@color/orange_above_avg"
                android:endColor="@color/orange_above_avg"
                android:startColor="@color/orange_above_avg"
                android:type="sweep"
                android:useLevel="false" />
        </shape>
    </item>


</layer-list>

你可以通过以下方式测试它

        mProgressBar.setMax(totalQuestions);
        mProgressBar.setProgress(correctQuestion);

或者去这个图书馆