Android 自定义图像按钮：使用自定义选择器属性更改图像

我想根据事实更改imagebuttons的图像，如果数据库中有东西或没有。我决定通过一个带有属性的自定义选择器来实现这一点：empty、full、warning和alltake

现在，当我启动MainActivity时，我设置了一个对db的调用，并询问它是否为空。如果不是，属性应该从空：true、full:false、warning:false和alltake:false更改为空：false、full:true、warning:false和alltake:false

我的CustomImageButton类如下所示：

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

    private static final int[] STATE_EMPTY = {R.attr.state_empty};
    private static final int[] STATE_FULL = {R.attr.state_full};
    private static final int[] STATE_WARNING = {R.attr.state_warning};
    private static final int[] STATE_ALLTAKEN = {R.attr.state_alltaken};

    private boolean mIsEmpty = false;
    private boolean mIsFull = false;
    private boolean mIsWarning = false;
    private boolean mIsAlltaken = false;

    public void setEmpty(boolean isEmpty) {mIsEmpty = isEmpty;}
    public void setFull(boolean isFull) {mIsFull = isFull;}
    public void setWarning(boolean isWarning) {mIsWarning = isWarning;}
    public void setAlltaken(boolean isAlltaken) {mIsAlltaken = isAlltaken;}

    @Override
    public int[] onCreateDrawableState(int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 2);
        if (mIsEmpty) {
            mergeDrawableStates(drawableState, STATE_EMPTY);
        }
        if (mIsFull) {
            mergeDrawableStates(drawableState, STATE_FULL);
        }
        if (mIsWarning) {
            mergeDrawableStates(drawableState, STATE_WARNING);
        }
        if (mIsAlltaken) {
            mergeDrawableStates(drawableState, STATE_ALLTAKEN);
        }
        return drawableState;
    }

在我的主要活动中，我称这些函数为：

    CustomImageButton mondaybtn, tuesdaybtn, wednesdaybtn, thursdaybtn, fridaybtn, saturdaybtn, sundaybtn;


        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            setContentView(R.layout.activity_main);
            mondaybtn = (CustomImageButton) findViewById(R.id.iBtnMonday);
            tuesdaybtn = (CustomImageButton) findViewById(R.id.iBtnTuesday);
            wednesdaybtn = (CustomImageButton) findViewById(R.id.iBtnWednesday);
            thursdaybtn = (CustomImageButton) findViewById(R.id.iBtnThursday);
            fridaybtn = (CustomImageButton) findViewById(R.id.iBtnFriday);
            saturdaybtn = (CustomImageButton) findViewById(R.id.iBtnSaturday);
            sundaybtn = (CustomImageButton) findViewById(R.id.iBtnSunday);

            getDBInfo();
        }
 private void getDBInfo(){
        sqlcon = new SQLController(this);
        sqlcon.open();
        Cursor c = sqlcon.readEntry();
        int rows = c.getCount();
        Toast.makeText(MainActivity.this, "Rows in DB:" + String.valueOf(rows), Toast.LENGTH_LONG).show();
        if(rows >= 1){
            //ToDo all pictures full

            setCustomButtonImage(mondaybtn, false, true, false, false);
            setCustomButtonImage(tuesdaybtn, false, true, false, false);
            setCustomButtonImage(wednesdaybtn, false, true, false, false);
            setCustomButtonImage(thursdaybtn, false, true, false, false);
            setCustomButtonImage(fridaybtn, false, true, false, false);
            setCustomButtonImage(saturdaybtn, false, true, false, false);
            setCustomButtonImage(sundaybtn, false, true, false, false);

            setDisplayViewButtonClickListener(R.id.iBtnMonday, MedListActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnTuesday, MedListActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnWednesday, MedListActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnThursday, MedListActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnFriday, MedListActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnSaturday, MedListActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnSunday, MedListActivity.class);
        }
        else{
            setCustomButtonImage(mondaybtn, true, false, false, false);
            setCustomButtonImage(tuesdaybtn, true, false, false, false);
            setCustomButtonImage(wednesdaybtn, true, false, false, false);
            setCustomButtonImage(thursdaybtn, true, false, false, false);
            setCustomButtonImage(fridaybtn, true, false, false, false);
            setCustomButtonImage(saturdaybtn, true, false, false, false);
            setCustomButtonImage(sundaybtn, true, false, false, false);

            //ToDo all pictures empty
            setDisplayViewButtonClickListener(R.id.iBtnMonday, EnterMedActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnTuesday, EnterMedActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnWednesday, EnterMedActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnThursday, EnterMedActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnFriday, EnterMedActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnSaturday, EnterMedActivity.class);
            setDisplayViewButtonClickListener(R.id.iBtnSunday, EnterMedActivity.class);
        }
    }

    private void setCustomButtonImage(CustomImageButton btn,Boolean empty, Boolean full, Boolean warning,Boolean alltaken){

        btn.setEmpty(empty);
        btn.setFull(full);
        btn.setWarning(warning);
        btn.setAlltaken(alltaken);
    }

在drawables中，我为选择器提供了如下文件：

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

    <item
        dailymeds:state_empty="true"
        dailymeds:state_full="false"
        dailymeds:state_warning="false"
        dailymeds:state_alltaken="false"
        android:state_pressed="false"
        android:drawable="@drawable/emptyshapefriday" />

    <item
        dailymeds:state_empty="true"
        dailymeds:state_full="false"
        dailymeds:state_warning="false"
        dailymeds:state_alltaken="false"
        android:state_pressed="true"
        android:drawable="@drawable/demptyshapefriday" />

    <item
        dailymeds:state_full="true"
        dailymeds:state_empty="false"
        dailymeds:state_warning="false"
        dailymeds:state_alltaken="false"
        android:state_pressed="false"
        android:drawable="@drawable/fullshapefriday" />

    <item
        dailymeds:state_full="true"
        dailymeds:state_empty="false"
        dailymeds:state_warning="false"
        dailymeds:state_alltaken="false"
        android:state_pressed="true"
        android:drawable="@drawable/dfullshapefriday" /> ....

....

我还有res/values中所需的资源文件

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="dailymeds">

        <attr name="state_empty" format="boolean" />
        <attr name="state_full" format="boolean" />
        <attr name="state_warning" format="boolean" />
        <attr name="state_alltaken" format="boolean" />


    </declare-styleable>
</resources>

为什么即使我更改了空、满、警告和全拍属性，图像也没有更改