public class CheckedTextView extends TextView implements Checkable {
private boolean mChecked;
private int mCheckMarkResource;
private Drawable mCheckMarkDrawable;
private int mBasePaddingRight;
private int mCheckMarkWidth;
private static final int[] CHECKED_STATE_SET = {
R.attr.state_checked
};
public CheckedTextView(Context context) {
this(context, null);
}
public CheckedTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CheckedTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.CheckedTextView, defStyle, 0);
Drawable d = a.getDrawable(R.styleable.CheckedTextView_checkMark);
if (d != null) {
setCheckMarkDrawable(d);
}
boolean checked = a.getBoolean(R.styleable.CheckedTextView_checked, false);
setChecked(checked);
a.recycle();
}
public void toggle() {
setChecked(!mChecked);
}
@ViewDebug.ExportedProperty
public boolean isChecked() {
return mChecked;
}
/**
* <p>Changes the checked state of this text view.</p>
*
* @param checked true to check the text, false to uncheck it
*/
public void setChecked(boolean checked) {
if (mChecked != checked) {
mChecked = checked;
refreshDrawableState();
}
}
/**
* Set the checkmark to a given Drawable, identified by its resourece id. This will be drawn
* when {@link #isChecked()} is true.
*
* @param resid The Drawable to use for the checkmark.
*/
public void setCheckMarkDrawable(int resid) {
if (resid != 0 && resid == mCheckMarkResource) {
return;
}
mCheckMarkResource = resid;
Drawable d = null;
if (mCheckMarkResource != 0) {
d = getResources().getDrawable(mCheckMarkResource);
}
setCheckMarkDrawable(d);
}
/**
* Set the checkmark to a given Drawable. This will be drawn when {@link #isChecked()} is true.
*
* @param d The Drawable to use for the checkmark.
*/
public void setCheckMarkDrawable(Drawable d) {
if (mCheckMarkDrawable != null) {
mCheckMarkDrawable.setCallback(null);
unscheduleDrawable(mCheckMarkDrawable);
}
if (d != null) {
d.setCallback(this);
d.setVisible(getVisibility() == VISIBLE, false);
d.setState(CHECKED_STATE_SET);
setMinHeight(d.getIntrinsicHeight());
mCheckMarkWidth = d.getIntrinsicWidth();
mPaddingRight = mCheckMarkWidth + mBasePaddingRight;
d.setState(getDrawableState());
} else {
mPaddingRight = mBasePaddingRight;
}
mCheckMarkDrawable = d;
requestLayout();
}
@Override
public void setPadding(int left, int top, int right, int bottom) {
super.setPadding(left, top, right, bottom);
mBasePaddingRight = mPaddingRight;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
final Drawable checkMarkDrawable = mCheckMarkDrawable;
if (checkMarkDrawable != null) {
final int verticalGravity = getGravity() & Gravity.VERTICAL_GRAVITY_MASK;
final int height = checkMarkDrawable.getIntrinsicHeight();
int y = 0;
switch (verticalGravity) {
case Gravity.BOTTOM:
y = getHeight() - height;
break;
case Gravity.CENTER_VERTICAL:
y = (getHeight() - height) / 2;
break;
}
int right = getWidth();
checkMarkDrawable.setBounds(
right - mCheckMarkWidth - mBasePaddingRight,
y,
right - mBasePaddingRight,
y + height);
checkMarkDrawable.draw(canvas);
}
}
@Override
protected int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
}
return drawableState;
}
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
if (mCheckMarkDrawable != null) {
int[] myDrawableState = getDrawableState();
// Set the state of the Drawable
mCheckMarkDrawable.setState(myDrawableState);
invalidate();
}
}
@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
boolean populated = super.dispatchPopulateAccessibilityEvent(event);
if (!populated) {
event.setChecked(mChecked);
}
return populated;
}
}
如上所示，checkMarkDrawable 是在 Canvas 中确定 Gravity 位置的位置。 我的问题是：如何更改 checkMarkDrawable 的位置，例如在左侧的 TextView 中设置 checkMarkDrawable。