默哀日，基本上大多網(wǎng)頁(yè)的黑白化扛施，只要一句話就搞定了，思路就是加一個(gè)灰色的濾鏡屹篓。公司app一個(gè)大紅色也是夠尬的疙渣，那我們Android端是不是也可以這樣子干呢，我找度娘打聽(tīng)了一下堆巧，大神們已給出了方案妄荔，我也就不用去摳腦袋了〉簦看看實(shí)現(xiàn)過(guò)程吧

方法一

在onCreate中增加代碼

        Paint paint = new Paint();
        ColorMatrix cm = new ColorMatrix();
        cm.setSaturation(0);
        paint.setColorFilter(new ColorMatrixColorFilter(cm));
        getWindow().getDecorView().setLayerType(View.LAYER_TYPE_HARDWARE, paint);

方法來(lái)源馬占柱

方法二

1.首先啦租，寫(xiě)一個(gè)黑白模式的FrameLayout布局

public class GrayFrameLayout extends FrameLayout {
    private Paint mPaint = new Paint();

    public GrayFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);

        ColorMatrix cm = new ColorMatrix();
        cm.setSaturation(0);
        mPaint.setColorFilter(new ColorMatrixColorFilter(cm));
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        canvas.saveLayer(null, mPaint, Canvas.ALL_SAVE_FLAG);
        super.dispatchDraw(canvas);
        canvas.restore();
    }


    @Override
    public void draw(Canvas canvas) {
        canvas.saveLayer(null, mPaint, Canvas.ALL_SAVE_FLAG);
        super.draw(canvas);
        canvas.restore();
    }

}

2.在你的BaseActivity中加上，替換android.id.content 對(duì)應(yīng)的 FrameLayout

@Override
public View onCreateView(String name, Context context, AttributeSet attrs) {
    try {
        if ("FrameLayout".equals(name)) {
            int count = attrs.getAttributeCount();
            for (int i = 0; i < count; i++) {
                String attributeName = attrs.getAttributeName(i);
                String attributeValue = attrs.getAttributeValue(i);
                if (attributeName.equals("id")) {
                    int id = Integer.parseInt(attributeValue.substring(1));
                    String idVal = getResources().getResourceName(id);
                    if ("android:id/content".equals(idVal)) {
                        GrayFrameLayout grayFrameLayout = new GrayFrameLayout(context, attrs);
                        return grayFrameLayout;
                    }
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return super.onCreateView(name, context, attrs);
}

3. 如果用了WebView谣沸，請(qǐng)加上webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);這句刷钢，不然位置會(huì)異常。

此方法更多細(xì)節(jié)請(qǐng)移步鴻洋的App 黑白化實(shí)現(xiàn)探索乳附，有一行代碼實(shí)現(xiàn)的方案嗎？