[游戏开发]Android自定义view：自定义属性 TypedArray

定义：

<declare-styleable name="MyView">
    <attr name="vColor" format="color" />
    <attr name="vDrawable" format="color|reference" />
    <attr name="vDimen" format="dimension" />
    <attr name="vReference" format="reference" />
    <attr name="vBoolean" format="boolean" />
    <attr name="vFloat" format="float" />
    <attr name="vInteger" format="integer" />
    <attr name="vString" format="string" />
    <attr name="vFraction" format="fraction" />

    <attr name="vType" format="enum">
        <enum name="type1" value="1" />
        <enum name="type2" value="2" />
        <enum name="type3" value="3" />
    </attr>

    <attr name="vFlag" format="flags">
        <flag name="flag1" value="0x1" />
        <flag name="flag2" value="0x2" />
        <flag name="flag3" value="0x3" />
    </attr>
</declare-styleable>

声明

public class MyView extends View {
    private static final String TAG = MyView.class.getSimpleName();

    public MyView(Context context) {
        this(context, null);
    }

    public MyView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, -1);
    }

    public MyView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyView);
        
        int vColor = typedArray.getColor(R.styleable.MyView_vColor, getResources().getColor(R.color.black));
        // ColorDrawable / BitmapDrawable
        Drawable vDrawable = typedArray.getDrawable(R.styleable.MyView_vDrawable);
        float vDimen = typedArray.getDimension(R.styleable.MyView_vDimen, dp2px(20));
        float vFloat = typedArray.getFloat(R.styleable.MyView_vFloat, -1F);
        int vInteger = typedArray.getInteger(R.styleable.MyView_vInteger, -1);
        boolean vBoolean = typedArray.getBoolean(R.styleable.MyView_vBoolean, false);
        String vString = typedArray.getString(R.styleable.MyView_vString);
        int vReference = typedArray.getResourceId(R.styleable.MyView_vReference, R.mipmap.ic_launcher);
        int vType = typedArray.getInteger(R.styleable.MyView_vType, -1);
        int vFlag = typedArray.getInt(R.styleable.MyView_vFlag, 0);
        Log.e(TAG, "MyView:vColor===============> " + vColor);
        Log.e(TAG, "MyView:vDrawable===============> " + vDrawable);
        Log.e(TAG, "MyView:vDimen===============> " + vDimen);
        Log.e(TAG, "MyView:vFloat===============> " + vFloat);
        Log.e(TAG, "MyView:vInteger===============> " + vInteger);
        Log.e(TAG, "MyView:vBoolean===============> " + vBoolean);
        Log.e(TAG, "MyView:vString===============> " + vString);
        Log.e(TAG, "MyView:vReference===============> " + vReference);
        Log.e(TAG, "MyView:vType===============> " + vType);
        Log.e(TAG, "MyView:vFlag===============> " + vFlag);

        typedArray.recycle();
    }

    /**
     * dp转px
     *
     * @param dp dp值
     * @return px值
     */
    public int dp2px(float dp) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,
                getResources().getDisplayMetrics());
    }

    /**
     * sp转px
     *
     * @param sp sp值
     * @return px值
     */
    private int sp2px(float sp) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp,
                getResources().getDisplayMetrics());
    }
}

使用

<com.xq.myapplication.view.MyView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:vBoolean="true"
    app:vColor="#000000"
    app:vDimen="18dp"
    app:vDrawable="@android:color/white"
    app:vFlag="flag1|flag2|flag3"
    app:vFloat="3.14"
    app:vInteger="10086"
    app:vReference="@mipmap/ic_launcher"
    app:vString="自定义属性"
    app:vType="type3" />

drawable 的绘制

void drawDrawable(Canvas canvas, Rect bound,Drawable drawable) {
    drawable.setBounds(bounds);
    drawable.draw(canvas);
}