SearchView.java 文件源码

public SearchView(Context context, StringBuilder queryText) {
    super(context);

    mContext = context;
    mQueryText = queryText;

    mPaint = new Paint();
    mPaint.setAntiAlias(true);

    final SurfaceHolder holder = getHolder();
    holder.setFormat(PixelFormat.TRANSLUCENT);
    holder.addCallback(mSurfaceCallback);

    final Resources res = context.getResources();

    int mExtremeRadius = 128;

    // Gradient colors.
    final int gradientInnerColor = res.getColor(R.color.search_overlay);
    final int gradientOuterColor = res.getColor(R.color.search_overlay);
    final int[] colors = new int[] {gradientInnerColor, gradientOuterColor};
    mGradientBackground =
            new GradientDrawable(Orientation.TOP_BOTTOM, colors);
    mGradientBackground.setGradientType(GradientDrawable.LINEAR_GRADIENT);
}