android

android progressdrawable的自定义形状方法

小樊
85
2024-08-27 19:35:30
栏目: 编程语言

在Android中,自定义ProgressDrawable的形状可以通过创建一个新的类并继承自ProgressDrawable来实现。以下是一个简单的示例,展示了如何创建一个带有自定义形状的ProgressDrawable:

  1. 首先,创建一个新的类,继承自ProgressDrawable:
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;

public class CustomProgressDrawable extends Drawable {
    private Paint paint;

    public CustomProgressDrawable() {
        paint = new Paint();
        paint.setAntiAlias(true);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(10);
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        super.onBoundsChange(bounds);
    }

    @Override
    public void draw(Canvas canvas) {
        // 在这里绘制你的自定义形状
        Rect bounds = getBounds();
        int centerX = bounds.centerX();
        int centerY = bounds.centerY();
        int radius = Math.min(centerX, centerY) - (int) paint.getStrokeWidth() / 2;

        paint.setColor(0xFF009688);
        canvas.drawCircle(centerX, centerY, radius, paint);

        paint.setColor(0xFFFF5722);
        canvas.drawArc(bounds.left, bounds.top, bounds.right, bounds.bottom, 270, 120, false, paint);
    }

    @Override
    public void setAlpha(int alpha) {
        paint.setAlpha(alpha);
    }

    @Override
    public void setColorFilter(ColorFilter colorFilter) {
        paint.setColorFilter(colorFilter);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }
}
  1. 然后,在你的布局文件中使用这个自定义的ProgressDrawable:
    android:id="@+id/progressBar"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:indeterminate="false"
    android:max="100"
    android:progress="50" />
  1. 最后,在你的Activity或Fragment中设置自定义的ProgressDrawable:
ProgressBar progressBar = findViewById(R.id.progressBar);
CustomProgressDrawable customProgressDrawable = new CustomProgressDrawable();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    progressBar.setProgressDrawable(customProgressDrawable);
} else {
    progressBar.setIndeterminateDrawable(customProgressDrawable);
}

这样,你就可以看到一个带有自定义形状的ProgressBar了。你可以根据需要修改CustomProgressDrawable类中的draw()方法,以绘制你想要的形状。

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