學習android 源碼 之創建 提示對話框

 代碼位置(android 9)：

packages\apps\PackageInstaller\src\com\android\packageinstaller\PackageInstallerActivity.java

效果：

 

 

 

/**
     * Dialog to show when the source of apk can not be identified
     */
    public static class AnonymousSourceDialog extends DialogFragment {
        static AnonymousSourceDialog newInstance() {
            return new AnonymousSourceDialog();
        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            return new AlertDialog.Builder(getActivity())
                    .setMessage(R.string.anonymous_source_warning)
                    .setPositiveButton(R.string.anonymous_source_continue,
                            ((dialog, which) -> {
                                PackageInstallerActivity activity = ((PackageInstallerActivity)
                                        getActivity());

                                activity.mAllowUnknownSources = true;
                                activity.initiateInstall();
                            }))
                    .setNegativeButton(R.string.cancel, ((dialog, which) -> getActivity().finish()))
                    .create();
        }

        @Override
        public void onCancel(DialogInterface dialog) {
            getActivity().finish();
        }
    }

 調用：

case DLG_ANONYMOUS_SOURCE:
                return AnonymousSourceDialog.newInstance();

/**
     * Replace any dialog shown by the dialog with the one for the given {@link #createDialog id}.
     *
     * @param id The dialog type to add
     */
    private void showDialogInner(int id) {
        DialogFragment currentDialog =
                (DialogFragment) getFragmentManager().findFragmentByTag("dialog");
        if (currentDialog != null) {
            currentDialog.dismissAllowingStateLoss();
        }

        DialogFragment newDialog = createDialog(id);
        if (newDialog != null) {
            newDialog.showAllowingStateLoss(getFragmentManager(), "dialog");
        }
    }

/**
     * Create a new dialog.
     *
     * @param id The id of the dialog (determines dialog type)
     *
     * @return The dialog
     */
    private DialogFragment createDialog(int id) {
        switch (id) {
            case DLG_PACKAGE_ERROR:
                return SimpleErrorDialog.newInstance(R.string.Parse_error_dlg_text);
            case DLG_OUT_OF_SPACE:
                return OutOfSpaceDialog.newInstance(
                        mPm.getApplicationLabel(mPkgInfo.applicationInfo));
            case DLG_INSTALL_ERROR:
                return InstallErrorDialog.newInstance(
                        mPm.getApplicationLabel(mPkgInfo.applicationInfo));
            case DLG_NOT_SUPPORTED_ON_WEAR:
                return NotSupportedOnWearDialog.newInstance();
            case DLG_INSTALL_APPS_RESTRICTED_FOR_USER:
                return SimpleErrorDialog.newInstance(
                        R.string.install_apps_user_restriction_dlg_text);
            case DLG_UNKNOWN_SOURCES_RESTRICTED_FOR_USER:
                return SimpleErrorDialog.newInstance(
                        R.string.unknown_apps_user_restriction_dlg_text);
            case DLG_EXTERNAL_SOURCE_BLOCKED:
                return ExternalSourcesBlockedDialog.newInstance(mOriginatingPackage);
            case DLG_ANONYMOUS_SOURCE:
                return AnonymousSourceDialog.newInstance();			
        }
        return null;
    }