android.support.v7.widget.GridLayout#getContext ( )源码实例Demo

private View createOptionIcon(GridLayout parent, int rowIndex, boolean editIconExists) {
    // The icon has a pre-defined width.
    ImageView optionIcon = new ImageView(parent.getContext());
    optionIcon.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
    if (mOption.isEditable()) {
        optionIcon.setMaxWidth(mEditableOptionIconMaxWidth);
    } else {
        optionIcon.setMaxWidth(mNonEditableOptionIconMaxWidth);
    }
    optionIcon.setAdjustViewBounds(true);
    optionIcon.setImageDrawable(mOption.getDrawableIcon());

    // Place option icon at column three if no edit icon.
    int columnStart = editIconExists ? 2 : 3;
    GridLayout.LayoutParams iconParams =
            new GridLayout.LayoutParams(GridLayout.spec(rowIndex, 1, GridLayout.CENTER),
                    GridLayout.spec(columnStart, 1, GridLayout.CENTER));
    iconParams.topMargin = mVerticalMargin;
    parent.addView(optionIcon, iconParams);

    optionIcon.setOnClickListener(OptionSection.this);
    return optionIcon;
}
 

private TextView createLabel(GridLayout parent, int rowIndex, boolean optionIconExists,
        boolean editIconExists, boolean isEnabled) {
    Context context = parent.getContext();
    Resources resources = context.getResources();

    // By default, the label appears to the right of the "button" in the second column.
    // + If there is no button, no option and edit icon, the label spans the whole row.
    // + If there is no option and edit icon, the label spans three columns.
    // + If there is no edit icon or option icon, the label spans two columns.
    // + Otherwise, the label occupies only its own column.
    int columnStart = 1;
    int columnSpan = 1;
    if (!optionIconExists) columnSpan++;
    if (!editIconExists) columnSpan++;

    TextView labelView = new TextView(context);
    if (mRowType == OPTION_ROW_TYPE_OPTION) {
        // Show the string representing the PaymentOption.
        ApiCompatibilityUtils.setTextAppearance(labelView, isEnabled
                ? R.style.PaymentsUiSectionDefaultText
                : R.style.PaymentsUiSectionDisabledText);
        labelView.setText(convertOptionToString(mOption,
                mDelegate.isBoldLabelNeeded(OptionSection.this),
                false /* singleLine */));
        labelView.setEnabled(isEnabled);
    } else if (mRowType == OPTION_ROW_TYPE_ADD) {
        // Shows string saying that the user can add a new option, e.g. credit card no.
        String typeface = resources.getString(R.string.roboto_medium_typeface);
        int textStyle = resources.getInteger(R.integer.roboto_medium_textstyle);
        int buttonHeight = resources.getDimensionPixelSize(
                R.dimen.payments_section_add_button_height);

        ApiCompatibilityUtils.setTextAppearance(
                labelView, R.style.PaymentsUiSectionAddButtonLabel);
        labelView.setMinimumHeight(buttonHeight);
        labelView.setGravity(Gravity.CENTER_VERTICAL);
        labelView.setTypeface(Typeface.create(typeface, textStyle));
    } else if (mRowType == OPTION_ROW_TYPE_DESCRIPTION) {
        // The description spans all the columns.
        columnStart = 0;
        columnSpan = 4;

        ApiCompatibilityUtils.setTextAppearance(
                labelView, R.style.PaymentsUiSectionDescriptiveText);
    } else if (mRowType == OPTION_ROW_TYPE_WARNING) {
        // Warnings use three columns.
        columnSpan = 3;
        ApiCompatibilityUtils.setTextAppearance(
                labelView, R.style.PaymentsUiSectionWarningText);
    }

    // The label spans two columns if no option or edit icon, or spans three columns if
    // no option and edit icons. Setting the view width to 0 forces it to stretch.
    GridLayout.LayoutParams labelParams =
            new GridLayout.LayoutParams(GridLayout.spec(rowIndex, 1, GridLayout.CENTER),
                    GridLayout.spec(columnStart, columnSpan, GridLayout.FILL, 1f));
    labelParams.topMargin = mVerticalMargin;
    labelParams.width = 0;
    if (optionIconExists) {
        // Margin at the end of the label instead of the start of the option icon to
        // allow option icon in the the next row align with the end of label (include
        // end margin) when edit icon exits in that row, like below:
        // ---Label---------------------[label margin]|---option icon---|
        // ---Label---[label margin]|---option icon---|----edit icon----|
        ApiCompatibilityUtils.setMarginEnd(labelParams, mLargeSpacing);
    }
    parent.addView(labelView, labelParams);

    labelView.setOnClickListener(OptionSection.this);
    return labelView;
}