vendor/mediatek/proprietary/packages/apps/Launcher3/src/com/android/launcher3/graphics/GradientView.java

private boolean mShowScrim = true;

protected void onDraw(Canvas canvas) {

Paint paint = mShowScrim ? mPaintWithScrim : mPaintNoScrim;

float head = 0.29f;

float linearProgress = head + (mProgress * (1f - head));

float startMaskY = (1f - linearProgress) * mHeight - mMaskHeight * linearProgress;

float interpolatedAlpha = (255 - mAlphaStart) * mAccelerator.getInterpolation(mProgress);

paint.setAlpha((int) (mAlphaStart + interpolatedAlpha));

float div = (float) Math.floor(startMaskY + mMaskHeight);

mAlphaMaskRect.set(0, startMaskY, mWidth, div);

mFinalMaskRect.set(0, div, mWidth, mHeight);

-  canvas.drawBitmap(mAlphaGradientMask, null, mAlphaMaskRect, paint);

+ // canvas.drawBitmap(mAlphaGradientMask, null, mAlphaMaskRect, paint); //huacao

canvas.drawRect(mFinalMaskRect, paint);

問題：修改後底下出現其他顏色的部分！

原因：機器本來是800*1280的，結果dpi設定為160，導致了這個問題。

解決方法一： 改dpi 為213或者240

解決方法二 ：把mMaskHeight 加點值 ，比如，mMaskHeight 改為 (mMaskHeight+30) 。

vendor/mediatek/proprietary/packages/apps/Launcher3/src/com/android/launcher3/graphics/GradientView.java

@Override

protected void onDraw(Canvas canvas) {

Paint paint = mShowScrim ? mPaintWithScrim : mPaintNoScrim;

Paint paint1 = mPaintNoScrim; //huacao

float head = 0.29f;

float linearProgress = head + (mProgress * (1f - head));

float startMaskY = (1f - linearProgress) * mHeight - (mMaskHeight+30) * linearProgress; //huacao

float interpolatedAlpha = (255 - mAlphaStart) * mAccelerator.getInterpolation(mProgress);

paint.setAlpha((int) (mAlphaStart + interpolatedAlpha));

float div = (float) Math.floor(startMaskY + (mMaskHeight+30));//huacao

mAlphaMaskRect.set(0, startMaskY, mWidth, div);

mFinalMaskRect.set(0, div, mWidth, mHeight);

//canvas.drawBitmap(mAlphaGradientMask, null, mAlphaMaskRect, paint);//huacao

canvas.drawRect(mFinalMaskRect, paint);

if (DEBUG) {

mDebugPaint.setColor(0xFF00FF00);

canvas.drawLine(0, startMaskY, mWidth, startMaskY, mDebugPaint);

canvas.drawLine(0, startMaskY + (mMaskHeight), mWidth, startMaskY + (mMaskHeight), mDebugPaint);

}

}