android - 按下拇指时Android SeekBar消失

Question

我创建了一个自定义 seekBar，在移动滑块时会绘制一个新的拇指。我现在希望拇指在按下时显示放大的拇指，然后当用户将手指从拇指上移开时显示原始大小。因此，如果用户按下拇指，它会放大到两倍大小。但是，这会导致显示放大的拇指，但 seekBar 的其余部分已经消失。下面是我的代码：

public class GradeSeekBar extends SeekBar implements OnSeekBarChangeListener {

    String TAG = "TOUCHING";


    public GradeSeekBar(Context context, SeekBar seekbar) {
        super(context);

    }

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

    public GradeSeekBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        //
        seekBar.setMax(7);

        int value = seekBar.getProgress();

        switch (value) {
        case 0:
            final int drawableId1 = R.drawable.readinglevelsliderk;
            final Drawable d1 = getResources().getDrawable(drawableId1);
            seekBar.setThumb(d1);


            break;
        case 1: // 1
            final int drawableId2 = R.drawable.readinglevelslider1;
            final Drawable d2 = getResources().getDrawable(drawableId2);
            seekBar.setThumb(d2);
            break;
        case 2:
            final int drawableId3 = R.drawable.readinglevelslider2;
            final Drawable d3 = getResources().getDrawable(drawableId3);
            seekBar.setThumb(d3);

            break;
        case 3:
            final int drawableId4 = R.drawable.readinglevelslider3;
            final Drawable d4 = getResources().getDrawable(drawableId4);
            seekBar.setThumb(d4);
            break;
        case 4:
            final int drawableId5 = R.drawable.readinglevelslider4;
            final Drawable d5 = getResources().getDrawable(drawableId5);
            seekBar.setThumb(d5);
            break;
        case 5:
            final int drawableId6 = R.drawable.readinglevelslider5;
            final Drawable d6 = getResources().getDrawable(drawableId6);
            seekBar.setThumb(d6);
            break;
        case 6:
            final int drawableId7 = R.drawable.readinglevelslider6;
            final Drawable d7 = getResources().getDrawable(drawableId7);
            seekBar.setThumb(d7);
            break;
        case 7: // All
            final int drawableId8 = R.drawable.allbutton;
            final Drawable d8 = getResources().getDrawable(drawableId8);
            seekBar.setThumb(d8);
            break;
        case 8: // All
            final int drawableId9 = R.drawable.allbutton;
            final Drawable d9 = getResources().getDrawable(drawableId9);
            seekBar.setThumb(d9);
            break;


        }

    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
        int value = seekBar.getProgress();

        switch (value) {
        case 0:
            final int drawableId1 = R.drawable.readinglevelsliderkdouble;
            final Drawable d1 = getResources().getDrawable(drawableId1);
            seekBar.setThumb(d1);


            break;
        case 1: // 1
            final int drawableId2 = R.drawable.readinglevelslider175x2;
            final Drawable d2 = getResources().getDrawable(drawableId2);
            seekBar.setThumb(d2);

            break;
        case 2:
            final int drawableId3 = R.drawable.readinglevelslider275x2;
            final Drawable d3 = getResources().getDrawable(drawableId3);
            seekBar.setThumb(d3);

            break;
        case 3:
            final int drawableId4 = R.drawable.readinglevelslider375x2;
            final Drawable d4 = getResources().getDrawable(drawableId4);
            seekBar.setThumb(d4);
            break;
        case 4:
            final int drawableId5 = R.drawable.readinglevelslider475x2;
            final Drawable d5 = getResources().getDrawable(drawableId5);
            seekBar.setThumb(d5);
            break;
        case 5:
             // 5
            break;
        case 6:
            // 6
            break;
        case 7: // All

            break;
        case 8: // All

            break;

        }

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

        int value = seekBar.getProgress();

        switch (value) {
        case 0:
            final int drawableId1 = R.drawable.readinglevelsliderk;
            final Drawable d1 = getResources().getDrawable(drawableId1);
            seekBar.setThumb(d1);


            break;
        case 1: // 1
            final int drawableId2 = R.drawable.readinglevelslider1;
            final Drawable d2 = getResources().getDrawable(drawableId2);
            seekBar.setThumb(d2);
            break;
        case 2:
            final int drawableId3 = R.drawable.readinglevelslider2;
            final Drawable d3 = getResources().getDrawable(drawableId3);
            seekBar.setThumb(d3);

            break;
        case 3:
            final int drawableId4 = R.drawable.readinglevelslider3;
            final Drawable d4 = getResources().getDrawable(drawableId4);
            seekBar.setThumb(d4);
            break;
        case 4:
            final int drawableId5 = R.drawable.readinglevelslider4;
            final Drawable d5 = getResources().getDrawable(drawableId5);
            seekBar.setThumb(d5);
            break;
        case 5:
            final int drawableId6 = R.drawable.readinglevelslider5;
            final Drawable d6 = getResources().getDrawable(drawableId6);
            seekBar.setThumb(d6);
            break;
        case 6:
            final int drawableId7 = R.drawable.readinglevelslider6;
            final Drawable d7 = getResources().getDrawable(drawableId7);
            seekBar.setThumb(d7);
            break;
        case 7: // All
            final int drawableId8 = R.drawable.allbutton;
            final Drawable d8 = getResources().getDrawable(drawableId8);
            seekBar.setThumb(d8);
            break;
        case 8: // All
            final int drawableId9 = R.drawable.allbutton;
            final Drawable d9 = getResources().getDrawable(drawableId9);
            seekBar.setThumb(d9);
            break;


        }



    }

}

这就是它在我的 main_activity.xml 文件中的放置方式：

<com.android.views.GradeSeekBar
        android:id="@+id/seekBar2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/imageButtonFilter"
        android:layout_toLeftOf="@+id/imageButtonArrowRight"
        android:layout_toRightOf="@id/imageButtonFilter"
        android:paddingLeft="52dp"
        android:paddingRight="35dp"
        android:thumb="@drawable/readinglevelsliderk"
        android:visibility="visible" />

您可以设置拇指的最大尺寸吗？