CheckableLinearLayout 实现一个可选中的layout 以及 CheckableImageView

本文介绍如何在Android中创建自定义的CheckableLinearLayout和CheckableImageView组件，通过实现Checkable接口来控制组件的状态，并使用XML定义不同的视觉状态。

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package com.example.testchecklinearlayout;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.Checkable;
import android.widget.LinearLayout;

public class CheckableLinearLayout extends LinearLayout implements Checkable {
	boolean mChecked = false;

	private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };

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

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

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

	@Override
	public void setChecked(boolean checked) {
		if (mChecked != checked) {
			mChecked = checked;
			refreshDrawableState();
		}
	}

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

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

	@Override
	public boolean performClick() {
		toggle();
		return super.performClick();
	}
}

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

    <item android:state_checked="true"><shape android:shape="rectangle">
            <solid android:color="#e13f2e" />
        </shape></item>
    <item android:state_checked="false"><shape android:shape="rectangle">
            <solid android:color="#ffffff" />
        </shape></item>

</selector>

<com.example.testchecklinearlayout.CheckableLinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/btn_add_selector"
    android:clickable="true"
    tools:context=".MainActivity" >

</com.example.testchecklinearlayout.CheckableLinearLayout>

public class CheckableImageView extends ImageView implements Checkable {
    private boolean mChecked;

    private static final int[] CHECKED_STATE_SET = {
        android.R.attr.state_checked
    };

    public CheckableImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setClickable(true);
    }
    public CheckableImageView(Context context) {
        super(context);
        setClickable(true);
    }

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

    public void toggle() {
        setChecked(!mChecked);
    }

    public boolean isChecked() {
        return mChecked;
    }

    public void setChecked(boolean checked) {
        if (mChecked != checked) {
            mChecked = checked;
            refreshDrawableState();
        }
    }
    @Override
    public boolean performClick() {
        toggle();
        return super.performClick();
    }
}