android - how to have a clickable AND checkable textview

问题

I want to have the following: a textview that .)changes its background when clicked .)maintains that background until it is clicked again

it all comes down to the "checkable" state, but i couldnt figure out how this exactly works. here is the xml i am using for background:

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

<!-- pressed -->
<item android:drawable="@drawable/menuselected"
android:state_pressed="true" />

<!-- checked -->
<item android:drawable="@drawable/menuselected"
android:state_checked="true" />

<!-- default -->
<item android:drawable="@drawable/transpixel"/>

</selector>

Update: it partly works now. I adopted most of the code from http://kmansoft.com/2011/01/11/checkable-image-button/ for my custom Textview. I did this as actually, I need the functionality of a radio button as well. Now I can check a Textview, but I cant uncheck it. Does anybody see why that could be the case?

回答1:

You can use CheckedTextView with checkMark null and background your selectable

<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:checkMark="@null"
    android:background="@drawable/selectable"/>

your selectable can be

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true" android:drawable="@drawable/selector" />
</selector>

回答2:

Make a custom TextView implementing android.widget.Checkable interface. That should be sufficient to make your selector work.

Below is the example implementation:

public class CheckableTextView extends TextView implements Checkable {
    private boolean isOn=false;

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

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

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

    @Override
    public int[] onCreateDrawableState(final int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
        if (isChecked())
            mergeDrawableStates(drawableState, CHECKED_STATE_SET);
        return drawableState;
    }

    @Override
    public void setChecked(boolean checked) {
        isOn=checked;
        refreshDrawableState();
    }

    @Override
    public boolean isChecked() {
        return isOn;
    }

    @Override
    public void toggle() {
        isOn=!isOn;
        refreshDrawableState();
    }

}

来源：https://stackoverflow.com/questions/16648793/android-how-to-have-a-clickable-and-checkable-textview

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